M50 PUMP MANUAL - Depco Pump

Section M50 • L50 Page 501Dated January 2000

97-4624-01-588

M50 • L50 SERIES

MTH PUMPS401 West Main Street • Plano, IL 60545-1436Phone: 630-552-4115 • Fax: 630-552-3688

URL: MTHPUMPS.COMEmail: [email protected]

Pump ManualHORIZONTAL CLOSE COUPLEDVERTICAL CLOSE COUPLEDHORIZONTAL FLEXIBLE COUPLED

http://www.depcopump.com/home.htm

M50 • L50 SERIES

1.General InstructionsHORIZONTAL CLOSE COUPLEDPUMPSVERTICAL CLOSE COUPLEDPUMPSHORIZONTAL FLEXIBLE COUPLEDPUMPS

A. Inspection of EquipmentB. StorageC. Placing Stored Pumps Into

ServiceD. Application ConsiderationsE. Recommended Spare Parts

When properly installed and givenreasonable care and maintenance,regenerative turbine pumps shouldoperate satisfactorily for many years.Because of the high differentialpressures expected in a regenerativeturbine pump, close runningclearances are used to reduceinternal losses. Abrasive particles,even microscopic ones, in highenough concentrations, can open upthe close clearances betweeninternal components. For criticalservices it is recommended that youkeep an identical pump for stand-byuse.

1A Inspection of Equipment

Immediately upon receipt of theshipment, inspect the equipment fordamage or missing components.Check the shipping manifest andreport any damage or shortage to theTransportation Company’s localagent.

Put the instructions that came withthe shipment in a safe place wherethey will be available to those whowill be using them for installation andservice.

1B Storage

If the pump is to be stored beforeuse, it should be inspected asdescribed in 1A, recrated, and storedin a dry location. Standard shippingcontainers are not suitable foroutdoor storage. In some areas, itmay be necessary to cover thepump’s exterior surface with oil orother rust inhibiting coating.

1C Placing Stored Pumps IntoService

Special care must be taken whenplacing stored pumps into service.First, clean the outside and flush outthe inside.

Make sure the shaft rotates freely. Onclose coupled units, access to the shaftis between the pump and motor. A visegrip or other plier-type gripping devicemay be used directly on the shaft orlock collar, depending on the motormodel used. Applying torque to themotor fan blades is not recommended.

1D Application Considerations

1D1 Electrical Wiring

All electrical equipment and wiringshould conform to local and NationalElectrical Codes. Use the motormanufacturer’s instructions forconnecting the motor. Note the correctrotation and wiring diagrams on theassembly. Make sure the motorrotation and speed matches thatrequired for the pump.

1D2 Construction Materials

While it is reasonable to assume thatgood judgement has been used inselecting all the materials in the pumpfor compatibility with process fluids,actual conditions sometimes vary fromoriginal specifications. Also, typicalmaterial selection charts do notconsider all the temperature, pressure,and fluid variables. The customer’sengineer should be consulted for finaljudgement on the best materials forcritical process applications.

1D3 Valves

The first valve to be considered for aregenerative turbine pumping systemmight be a pressure relief valve.Because this type of pump has ahorsepower requirement similar to thatof a positive displacement pump(constantly rising hp along withpressure increases) a relief valve canbe effectively used to limit horsepower.This is helpful when a non-overloadingmotor is specified. It can be of criticalimportance if the system flow rate canvary widely. There are almost nocircumstances where a flow modulating

valve will work successfully in aregenerative turbine pumpingsystem. The steep pumpingcharacteristic, typical of thesepumps, produces very large pressurechanges with small variations in flowrate. As a result, the modulating flowfrom the valve introduces sharppressure shock waves that shortenpump life and may cause damage toother pieces of equipment in thesystem.

A swing check valve is recommendedin the suction line even when thepump inlet is only slightly higher thanthe fluid source. It should be thesame size as the pump inlet or sizedbased on reasonable fluid frictionlosses.

A foot valve is recommended whenlifting fluid from a sump. This willsave wear and tear on any pump,even those equipped with selfpriming capability.

A Y-Strainer is recommendedimmediately ahead of the pump onany newly constructed system. Thisis advisable due to the probabilitythat foreign material large enough todamage pump clearances mayremain even though the piping hasbeen flushed.

Valves in the outlet piping of aregenerative turbine pump shouldalways be open as far as possiblewhen the pump is started. This willreduce the start-up load on the pumpand motor. Never start the pumpwith the discharge valve closed.

Inlet valving should be open whenstarting any pumping system.Without some fluid in the pump, itcan gall and lock up the impellers.Violent pump failure will result fromcontinued operation with the inletvalve closed.

1D4 Priming

Regardless of whether self-primingequipment is used or not, always fillthe pump and vent it of air beforestarting, for best seal and pump life.Under most circumstances,regenerative turbine pumps can bemade to self-prime as long as a

NPSH = 2.31( )+ Hs- Hf

For boiling liquids, Ps and Pvp areequal. This item then becomes zeroand can be omitted from the equation.

1D6 Noise

Regenerative turbine pumps typicallyproduce a high pitched whine thatincreases in intensity as the differentialpressure produced in the pumpincreases. While high frequency soundis attenuated more easily than lowerfrequencies, piping structures and thefluids in them readily transmit noise.Motors, bearings, and other rotatingcomponents add to the noise andsometimes create objectionableharmonics.

Adequate support for the inlet anddischarge piping is important for noisereduction.

1D7 Freezing

When ambient temperatures dropbelow the freezing point of the fluid in apump, consideration should be given toheating, insulating, or draining thepump. If you choose to drain the pump,and it will only be for a short period,first remove the drain plugs, then drainthe inlet and outlet lines. Carefullyblow out the pump with compressed airto clear all internal cavities of fluid.

1E Recommended Spare Parts

FOR CRITICAL SERVICES - a duplexinstallation, with two identical pumpingunits in parallel, is the safest and many

Page 503

Ps - Pvp sp. gr.small amount of fluid can be recirculated

through the impeller and the fluid doesn’theat up noticeably.

1D5 NPSH (Net Positive Suction Head)

The NPSH required varies with every sizeand capacity of pump. The NPSHrequired by your unit can be obtainedfrom the performance curves or from yourMTH representative.

If the NPSH available is not equal to orgreater than that required by the pump, itmust be increased or a different pumpselected. The usual method forincreasing NPSH is to raise the statichead on the pump inlet, (Hs).

By definition, NPSH means: “net positivesuction head” above the vapor pressureof the pumped liquid available at thecenterline of the pump. It should alwaysbe given in feet of pumped liquid. TheNPSH is actually a measurement of theamount of energy available in thepumped liquid to produce the requiredabsolute entrance velocity in the pump. Ifa pump requires more energy (or NPSH)than is available at a given capacity, thepressure at the inlet will fall below thevapor pressure of the pumped liquid andloss of performance will result as theliquid vaporizes.

Ps = Pressure in the suction vessel inPSIA.Pvp = Vapor pressure of the pumped fluidin PSIA.Hs = Static height of the pumped fluidabove (+) or below (-) the centerline ofthe pump in feet.Hf = All friction losses from the vessel tothe pump in feet.

times the most cost effective choice.

FOR IMPORTANT SERVICES - astandby pump, ready for installationis advised.

Special pricing and new pumpwarranty is offered for factoryrebuilding. Turn around time can beas short as one or two days forstandard models.

FOR ROUTINE MAINTENANCE -only the mechanical seals and acomplete set of “O” ring gaskets arerecommended. Should additionalcomponents show wear, they areavailable from stock at the factory.

FOR SERVICING A PUMP THATDOES NOT PRODUCE RATEDHEAD - mechanical seals, “O” ringgaskets, impeller, and channel rings.

FOR REBUILDING A PUMP - all thecomponents required for servicing,plus bearings, shaft, and drive keysfor flexible coupled pumps, should beobtained. A factory rebuild should beconsidered whenever yourdisassembly indicates rebuilding isnecessary, as this is usually moreeconomical.

The factory recommendation forspare parts are all of those listed forrebuilding a pump, and are shown onthe exploded view drawings for eachindividual type of pump.

Installation2.M50 • L50 SERIES

FLEXIBLE COUPLED PUMPSCLOSE COUPLED PUMPS

A. LocationB. FoundationC. LevelingD. AlignmentE. PipingF. Typical Installation

In order to insure that pumping equipmentis installed properly and to obtain reliablepump operation, it is recommended thatonly experienced, qualified erectingengineers undertake this task. Read theinstructions thoroughly before beginning.

2A Location

The first consideration for locating apump is elevation. The lowest possibleelevation using the shortest possiblesuction piping is usually the best.Questions regarding possible locationsshould be resolved by making inlethead calculations including all frictionlosses. The one producing the highestinlet pressure should be selected. Onereason for this precaution is that, thegreater the inlet pressure, the lesslikelihood of NPSH problems. Also, aflooded suction is particularly helpful onstart-up when the seals or the entirepump can be ruined because it is not

properly primed and purged of air.

A dry, easily accessible location isalso important. Allow ampleclearance around the unit for free aircirculation. If a dry location is notavailable, the pump can be mountedon a foundation, above the floor.Specify motor enclosure, pumpmaterials, or coatings to suit theworst conditions expected. Place thepump so that it can be easilyinspected and serviced duringoperation. Sufficient head roomshould be provided, particularly whenlifting devices will be used for heavierassemblies.

2B Foundation

Baseplates alone are not rigidenough to maintain alignment of theunit. The pump foundation is usedas a support for the baseplate tomaintain alignment of the unit. If thebaseplate is to be grouted to thefoundation, it is only necessary toembed the edges. It is unnecessaryto completely fill under the baseplate.DO NOT grout the unit to thefoundation until it has been properlyaligned.

The foundation must be a permanentrigid installation of concrete or othermaterial of sufficient mass to absorball normal vibrations. Locate thefoundation bolts using a layout ortemplate in relation to the suctionand discharge piping. If concrete isbeing used, foundation bolts of thespecified size can be enclosed in apipe sleeve two to three diameterslarger than the bolts to compensatefor minor variations in alignment.

Close coupled pumps can bemounted on a steel base prior toinstallation or mounted directly to thefoundation. Place shims under oneor more of the motor feet so thatstrain and distortion will not resultwhen the mounting bolts aretightened.

2C Leveling (Flexible CoupledPumps Only, Refer to Figure 2-1)

a. Place shims close to thefoundation bolts. (Refer toFigure 2-3)

To check the PARALLEL alignment:(Refer to Figure 2-4)

1. Place a straightedge across thetwo coupling flanges.

2. Measure the maximum offset(A), Figure 2-4, at various pointsaround the periphery of thecoupling. DO NOT rotate thecoupling.

3. If the maximum offset exceedsthe Parallel dimension in Chart 1for your sleeve size, loosen themotor or pump and place thinmetal shims under the motor orpump feet until the offset iscorrected.

4. Torque down the motor or pump.

5. Recheck alignment.

To check the ANGULAR alignment:(Refer to Figure 2-5)

Figure 2-1

If the unit is received with the pumpand motor mounted on the baseplate:

1. Place the unit in position.

2. Disconnect the coupling halves.Do not reconnect until allalignment procedures have beencompleted.

3. Support the baseplate on metalshims or wedges having a smalltaper. (Refer to Figure 2-2)

Figure 2-2 Foundation

1/4"

Finished Grouting

3/4" to 1 1/2"Allowance forGrout

Dam

Baseplate

Grout

Leveling Wedges or Shims - Left in Place

Pipe Sleeve

Washer

Lug

Top ofFoundation LeftRough - Cleanand Wet Down

Figure 2-3

b. Also place shims close towhere the greatest weight islocated.

4. Check the baseplate for distortion:

a. Place a straightedge along thebaseplate to determine if it isdistorted.

b. Adjust the shims until thebaseplate is not distorted.

5. Use a section of pipe to determineif the inlet and discharge openingsare vertical and located properly.

6. Correct the positions, if necessary,by adjusting the shims.

2D Alignment

Although flexible coupled pumps arecarefully aligned prior to crating andshipping, it is very likely that strainsimposed during transit have altered thealignment. Complete the followingsteps after the unit has been placed onthe foundation and leveled.

Figure 2-4

A

Figure 2-5

B

C

1. Using a micrometer or caliper,measure from the outside of oneflange to the outside of the otherat intervals around the peripheryof the coupling. DO NOT rotatethe coupling.

2. Determine the maximum (B) andminimum (C) dimensions.

3. If the difference between themaximum and minimum exceedsthe Angular dimension

05

in Chart 1 for your sleeve size,loosen the motor or pump andplace thin metal shims under themotor or pump feet until themisalignment is corrected.

4. Torque down the motor or pump.

5. Recheck the parallel alignment

After all leveling and alignmentoperations have been completed,piping can begin. After the piping hasbeen completed, refer to 2E1 PipingAlignment. Alignment of the unit mustbe rechecked to make certain that nopiping strains are causing distortion.After approximately two weeks ofoperation, check the alignment again tomake sure that temperature changes,piping strain, or foundation variationshave not caused misalignment. Ifalignment has been maintained overthis period, the pump and motor can bedoweled to the baseplate.

2E Piping

2E1 Alignment

It is important that all piping be lined upand not forced into place. It isrecommended that you begin piping atthe pump. If the lines are ended at thepump, particularly if the last piece is cuta little too short or long, the pump willbe forced to meet the pipe and strain or

CHART 1

above.

If the parallel or angular misalignmentis great, this is an indication ofbaseplate distortion and must becorrected first, refer to 2C Leveling.

COUPLING TYPES JE, J, SMAX. RPM & ALLOWABLE MISALIGNMENT

SLEEVESIZE

MAXIMUMRPM

PARALLELA

ANGULARB-C

3 9200 .010 .0354 7600 .010 .0435 7600 .015 .0566 6000 .015 .0707 5250 .020 .0818 4500 .020 .094

distortion will result.

2E2 Piping Support

Never allow the pump to supportpiping. Other means such as pipehangers and pipe supports should beused to carry piping to avoidmisalignment and distortion.Consideration should be given tothermally induced expansion andcontraction, particularly in long runsof straight pipe.

2E3 Piping Size

In general, outlet and especially inletpipe sizes should be equal to orlarger than those of the pump.

M50 • L50 SERIES

3.OperationFLEXIBLE COUPLED PUMPSCLOSE COUPLED PUMPS

A. RotationB. Inlet and Outlet LocationsC. Foreign MaterialD. ElectricalE. AdjustmentsF. Cooling WaterG. PrimingH. StartingI. Stopping

3A Rotation

The standard direction of rotation forthe pump is right-handed, or clockwisewhen looking at the motor end of thepump. A rotation arrow, refer to Figure3-1, is located on the pump to indicatethe correct direction of rotation.

Operating the pump in reverse willcause substantial performancevariations and can damage the pump.

Always confirm correct motor rotationprior to connection of the coupling. Ifthis is not possible, perform a finalrotation check as follows:

1. Jog the motor briefly.

2. Observe rotation as the unit comesto a stop.

3. Rotation should be in the directionof the arrow.

If the motor operates in the wrongdirection:

1. Interchange any two leads on athree-phase motor.

2. On a single-phase motor,change the leads as indicated onthe connection box cover. Somesingle-phase motors may not bereversible.

3B Inlet and Outlet Locations(Refer to Figure 3-1)

The pump inlet is located on the endnearest the motor, except on ModelM51 - in which case it is farthest formthe motor. The discharge or “outlet”can be on the top, side, or bottomdepending on the model andconstruction of the pump. Normaldischarge position is located on top

Figure 3-1

Outlet

Rotation

Inlet

Rotation

Inlet

Outlet

Rotation

Outlet

Inlet Rotation

in horizontal configurations, or in linewith vertically mountedconfigurations.

3C Foreign Material

All regenerative turbine pumps haveclose running clearances in order tomaintain efficiency. Take extraprecautions to insure that no foreignmaterial larger than 25 microns or.001 inches is allowed to passthrough the pump. Even particles ofthis size can damage the pump ifallowed to circulate continuously.Regenerative turbine pumps are notdesigned for slurries.

Large particles, weld spatter, andother material found in new pipingsystems will bend the impeller vanesand can sometimes lock up thepump. If a new pump does notoperate properly, the first thing tocheck for is damage from foreignmaterial.

3D Electrical

It is important to be aware of andfollow the appropriate local andnational electrical codes. Do notmake wiring alterations that canaffect motor rotation withoutreconfirming correct rotation.

3E Adjustments

No adjustments are necessary oradvisable on new pumps other thanthose required for installation.Because of the close fits inregenerative turbine pumps, it is notuncommon for the pump to bedifficult to turn over by hand after theinternal parts have been allowed todry out. New pumps from the factoryare tested using rust inhibitors tohelp preclude this possibility. On sitesystem flushing may remove theseinhibitors and subject the pump tothe risk of lock up, if it is allowed todry out. In this case, do the following:

1. Fill the pump with fluid, then wait2 hours prior to proceeding.

2. C3 Motors/P3 Bearing Frames

a. Using a 5/32" Allen wrenchinserted into the lock collarsetscrew (#15), using theAllen wrench as a handlerotate shaft to verify there isnot binding. (DO NOT

LOOSEN THE SETSCREW)

b. Remove the Allen wrench.

c. Jog the pump momentarily andobserve there is no binding orabnormal noise.

d. This should “break” theimpeller loose withoutdamage, unless foreignmaterial has entered thepump.

3. C30 Motors/P30 Bearing Frames

a. Rotate the shaft to verify thereis no binding. Remove thedrain plug from the outletcover and insert a 3/8” Allenwrench into the socket end ofthe shaft, using the wrench asa handle. If draining fluid fromthe pump is not practical, usethe coupling on flex-coupledunits to turn the shaft.Otherwise, a vise grip or otherplier-type gripping device maybe used directly on the shaftbetween the pump and themotor.

b. Remove the Allen wrench orpliers.

c. Replace the drain plug andrefill with fluid, if the pump wasdrained.

d. Jog the pump momentarily andobserve there is no binding orabnormal noise.

e. This should “break” theimpeller(s) loose withoutdamage, unless foreignmaterial has entered thepump.

This procedure will flush residue fromthe close fitting impeller surfaces. If notimmediately successful, refer to Section1, 1C Placing Stored Pumps IntoService.

Because of the large areas of closefitting surfaces inside these pumps, ittakes only microscopic residue toproduce resistance to rotation. Onceloosened, this material is quicklydispersed and the impellers will findtheir hydraulic center. If theseprocedures are followed carefully, nodamage will result from “breakingloose” the impeller.

3F Cooling Water

When the pump is used to transferhot fluids, consideration should begiven to cooling the seals and/orselecting materials that will givesatisfactory seal life. The actualtemperature at the seal faces, themost critical area, will always exceedthe surrounding fluid temperature.

3G Priming

Pumps should not be operatedunless they are completely filled withliquid. Damage to parts of the pumpthat depend on liquid for theirlubrication can occur. Impellers canseize quickly when a pump is run dry.Without lubrication, seal faces can bedamaged from heat buildup.

3H Starting

Before starting a pump for the firsttime, be sure that all the precedingoperations have been carried out.Proper rotation, priming, and a freeturning pump are most important.

1. Start the pump with the minimumpossible line restriction.

2. Open discharge valves beforepressing the starter.

3. Start the pump and let thesystem clear of air.

4. Listen for foreign material beingcarried through the pump.

5. Slowly close necessary valves orotherwise place the pump intoservice.

6. Listen for indications of undueload or other sounds indicatingproblems.

7. Use a clip-on ammeter to checkfor a steady load afterapproximately fifteen minutes ofoperation.

3I Stopping

It is best to stop the pump with theleast discharge head possible bothfor minimizing strain on components,and to be in low power mode inanticipation of restarting.

4.ServiceM50 • L50 SERIES

Figure 4-1

Figure 4-2

PUMP ENDS

A. PreliminaryB. Disassembly Vertical Single Stage

on C3 MotorsC. Disassembly Multistage on C3

Motors / P3 Bearing FramesD. Disassembly Multistage on C30

Motors / P30 Bearing FramesE. Inspection of ComponentsF. Reassembly Vertical Single Stage

on C3 MotorsG. Reassembly Multistage on C3

Motors / P3 Bearing FramesH. Reassembly Multistage on C30

Motors / P30 Bearing FramesI. Testing and Final Adjustments

4A Preliminary

Before attempting any service on thepump or motor, disconnect theelectrical power to the motor. If thepump and motor are to be removedas a unit, note the wiringconfiguration, using colored ornumbered tape.

1. Disconnect the inlet and outletpiping before unbolting the pumpand motor.

2. Unbolt the motor from the baseand remove the unit. All work onthe unit should be performed onan elevated workbenchwhenever possible.

The disassembly and reassemblyprocedures are broken into eightsections covering the following units:

B — Disassembly Vertical SingleStage on C3 Motors

C — Disassembly Multistage on C3Motors / P3 Bearing Frames

D — Disassembly Multistage on C30Motors / P30 Bearing Frames

E — Reassembly Vertical SingleStage on C3 Motors

F — Reassembly Multistage on C3Motors / P3 Bearing Frames

G — Reassembly Multistage on C30Motors / P30 Bearing Frames

Exploded views of each unit, Figures4-4, 4-11, and 4-12, are provided forreferencing the numbers in thefollowing procedures, i.e. (#1), motorbracket.

4B Disassembly Vertical SingleStage on C3 Motors

The following tools and equipment areneeded for disassembly of C3 units.

1. Soft plastic or wooden mallet.2. 9/16" wrench or socket.3. 5/32" hex wrench.4. Penetrating oil.5. 1" wood dowel (Approx. 6" long).6. Thin blade screwdriver.7. Two large blade screwdrivers.

To disassemble the pump:

Refer to Figure 4-4 for reference to thenumbered parts in the proceduresbelow.

1. Remove all liquid from the pump.Air blown through the pump willremove the fluid quickly.

2. Remove the two (2) Nuts (#20) andthe two (2) 3/8" X 4" Bolts (#19)from the Cover (#2). On stainlesssteel models, remove the four (4)Nuts (#20).

3. Remove the cover (#2). In somecases light tapping with a plastic orwooden mallet on the outsidediameter of the cover may berequired to loosen it from the motorbracket. Care should be taken if ascrewdriver is needed to prybetween the cover and motorbracket. Damage to the “O” Ring(#7) and/or impeller can result.

4. Remove the Impeller (#11). Referto Figure 4-1. The impeller is aslip fit and, under normalconditions, can be removed bygently tapping on the end of theshaft sleeve with a mallet. Leavethe Impeller Key (#23) in place.

Striking the sleeve too hardcould damage the seat orrotating element.

5. Using the 5/32" hex wrench,loosen the Set Screws (#15) inthe Locking Collar (#14), locatedon the shaft sleeve between themotor bracket and the motorface. The collar should now beloose on the sleeve. Note thecondition of the setscrews in thecollar and replace if necessary.

6. Remove the Shaft Sleeve (#17).The sleeve is a keyed fit and isremoved using two largescrewdrivers. Refer to Figure 4-2.

a. Insert the blades of thescrewdrivers between thespring holder on the rotatingelement and the shoulder ofthe shaft sleeve.

b. Holding the screwdrivers atapproximately 3 o’clock and9 o’clock, push the handlesin toward the motor body,using the motor bracket forleverage.

7. In some cases a rocking motionof the screwdrivers will benecessary to break the sleeveloose. Normally the rotatingelement will slide off with thesleeve. DO NOT attempt toremove the sleeve by rotating it.(Previous models have used athreaded shaft and differentprocedures are required in thesecases.)

8. Remove the Seal RotatingElement (#12) from the sleeve.Refer to Figure 4-3. Theelement normally adheres tightlyto the sleeve and some force

C3 VERTICAL MOUNT PUMP

may be necessary to remove it. Thisis common and if care is taken,the element can be reassembledand reused. It is recommendedthat a new rotating element beused for reassembly. DO NOTattempt to remove the seal usinga screwdriver or other sharpobject. Extensive damage to theshaft, sleeve, or element couldoccur.

9. Before the motor bracket (#1)can be removed, the four (4)“O”rings (#8), located on theupper left and right studs mustbe removed.

a. Gently tap on the back ofthe motor bracket,alternately between the leftand the right side, unit themotor bracket movesapproximately 1/4".

b. Tap the motor bracket faceto move it back to its originallocation.

c. Remove the “O”rings bysliding them off the studs.

d. Slide the motor bracketstraight off. Do not attemptto remove the motor bracketwithout first removing the“O”rings (#8).

10. Remove the Seal StationarySeat (#125). Refer to Figure 4-5.

Figure 4-5

Figure 4-3

PART NO. NAME / DESCRIPTION QTY.

1 Motor Bracket 12 Cover Inlet 17 "O" Ring, Casing 18 "O" Ring, Guide Rod 411 Impeller 112 Seal Rotating Element 1

125 Seal Stationary Seat 114 Lock Collar/Sleeve 115 Setscrew/Lock Collar 217 Shaft Sleeve 118 Guide Rod (Qty. 4 on Stainless

Steel)2

19 Thru-Bolt (Qty. 0 on Stainless Steel) 220 Nut (Qty. 4 on Stainless Steel) 222 Plug/Drain 123 Key, Impeller Drive 1

23A Key, Sleeve Drive 1

Figure 4-4

125

12

23

23A

18

7

11

2

1514

1

17

C3

1920

8

a. Place the motor bracket facedown on a flat surface.

b. Looking into the opening in thecenter of the bracket, you willsee a portion of the seat.

c. Insert the 1" dowel and, verygently, tap the seat until itdrops out.

d. Care must be taken with theseats. They are a brittlematerial and are prone tobreakage. It isrecommended that a newreplacement seat beinstalled during reassembly.

3. Repeat step 2 to remove the otherbearing. Good support used onthe inner races will prevent bearingdamage.

4C Disassembly (P30)

Disassemble pump components asshown in Section 4, M50 • L50 PUMPENDS, 4E Disassembly Multistage onC30 Motors / P30 Bearing Frames.

The following tools and equipment areneeded for disassembly of the P30units:

1. Plastic or wooden mallet2. Arbor press or vise3. Thin blade screwdriver4. Adjustable spanner wrench5. 3/8" Hex wrench6. 7/16" Wrench or socket7. Gear puller8. Penetrating oil

When installing or removing bearingsfrom the shaft, the use of an arborpress is strongly recommended.

To disassemble the pedestal:

Refer to Figure 4-28 for reference tothe numbered parts in theprocedures below.

1. Remove Bearing FrameMounting Brackets (#31) byunscrewing Shoulder Screws(#33C) with a 3/8" hex wrench.

2. Remove the four (4) HexCapscrews (#33B) that hold theBearing Frame Housing (#3) tothe End Bell (#101), using a 7/16" wrench or socket.

3. Position assembly horizontallyon workbench. Holding bearingframe housing firmly, tap on thecoupling end of shaft with rubbermallet until the assembly comesapart.

4. Remove guide rod nuts andguide rods from end bell.

5. Remove Outboard Bearing(#24A) using a gear puller.

6. With a spanner wrench, unscrewthe Outboard Bearing AdjustingNut (#110A) from the end bell.

7. Support end bell, with motormounting face up, and press outshaft / bearing assembly witharbor press. Remove InboardBearing Adjusting Nut (#110).

8. Disengage bearing lockwashertang from slot in Bearing

Locknut (#38), using a thin bladescrewdriver. Locknut and BearingLockwasher (#39) may now beremoved from shaft. Grip shaft inthe area between the two bearingsurfaces only.

9. Place shaft / bearing assembly inarbor press and remove theInboard Bearing (#24).

4D Inspection of Components

Thoroughly clean all parts. Allcomponents should be examined forwear and corrosion. Replace anyparts showing visible wear.

Check to be certain that a press fit stillexists between the shaft and thebearings. New bearings, or at leastcleaned and regreased bearings, arerecommended.

Check the shaft for galling, pitting, andcorrosion. Surface corrosion on thepump portion of the shaft must beremoved so the seals will slide freelyduring assembly. The shaft diametershould be no smaller than .002" belowthe nominal fractional seal sizes.Remove any nicks or burrs which mayhave occurred during disassembly.Reclean parts as necessary.

4E Reassembly (P3)

All parts should be visually inspectedand cleaned or replaced as outlined in4D above. It is recommended that thebearings be replaced any time thebearing pedestal is disassembled forservice.

The following tools and equipment areneeded for reassembly of P3 units:

1. Arbor press2. Rubber or plastic mallet3. Internal snap ring pliers4. 3/4" X 6" piece of water pipe

To reassemble the bearing frame:

Refer to Figure 4-24 for reference tothe numbered parts in the reassemblybelow.

1. Using an arbor press, install thebearings on the shaft prior toinstalling the shaft into thepedestal. A steel “donut” with theproper inside diameter andoutside diameter, refer to Chart 1,should be used between the

Proceed to section 4E Inspection ofComponents.

4C Disassembly Multistage on C3Motors / P3 Bearing Frames

The following tools and equipment areneeded for disassembly of C3 / P3units.

1. Soft plastic or wooden mallet.2. Two 9/16" wrenches or sockets.3. 5/32" hex wrench.4. Side cutters (for removing keys).5. 1" wood dowel (Approx. 6" long).6. Thin blade screwdriver.7. Two large blade screwdrivers.8. Penetrating oil.


Refer to Figure 4-11 for reference tothe numbered parts in the proceduresbelow.


2. Lay the pump on the workbenchhorizontally.

3. Remove the four (4) Nuts (#20)from the Guide Rods (#18).

4. Remove the eight (8) Nuts (#20)from the Thru-Bolts (#19) locatedon the inlet cover (#1 or 1IN). Pullout the thru-bolts.

5. Using a soft mallet, loosen theOutlet Cover (#2) by tapping lightlyaround the outside edge. Slip thecover off the Guide Rods (#18),being careful not to bend them.

6. Do not remove the Plain Bearing(#87) from the outlet cover unlessit is worn. This bearing is a pressfit and cannot be removed withoutbeing damaged.

7. Remove the four (4) Guide Rod “O”Rings (#8).

8. Mark on the outside surface of theChannel Rings (#9 & #10) suchthat the top to bottom relationshipas well as the order is maintained.Number stamps are preferable toless permanent markings that tendto be lost during cleaning.

9. Separate the first Channel Ring(#9) by gently tapping the ring

around the outside edge with asoft mallet and slide it off theguide rods, exercising care toprevent damage. Should pryingbe necessary, it should be doneevenly and with great care.

10. Remove the Interstage Bushing(#16) from the Channel Ring (#9)just removed.

11. Remove the next Channel Ring(#10) using the same care aswith the first. The Impeller (#11)will come off along with thechannel ring. Do not attempt topry the impeller off first, as pryingwill damage the impeller vanes.Hold the impeller in place when itreaches the end of the shaft so itdoes not fall. Refer to Figure 4-6.

Figure 4-6

12. Remove the Impeller Key (#23).

13. Remove the remaining channelrings, impellers, keys, andinterstage bushings. Stackingthe parts as they are removedwill help in maintaining theproper orientation. It is importantto keep the impellers with thesame pair of channel rings.

You may find it easier to disassemblethe pump further by standing thepump up on the motor end whenthere are fewer stages on the pump.

For standard pumps (M50 Series),skip to step 16.

14. For inducer pumps (L50 Series),remove the Inducer Ring (#9IN).

15. Remove the inducer impeller.

a. Remove the Snap Ring(#14A) at the impeller hub.A small pocket screwdriver

will see a portion of the seat.

c. Insert the 1" dowel, and verygently, tap the seat until itdrops out.

d. Care must be taken with theseats. They are a brittlematerial and are prone tobreakage. It isrecommended that a newreplacement seat be usedduring reassembly.

22. It is not necessary to remove theLocking Collar (#14) from themotor shaft unless motor repairsare planned. Note the conditionof the setscrews in the collar,and replace if necessary.


4D Disassembly Multistage on C30Motors / P30 Bearing Frames

The following tools and equipmentare needed for disassembly of C30 /P30 units.

1. Soft plastic or wooden mallet2. Two 9/16" wrenches or sockets3. 3/4" wrench or socket4. 3/8" hex wrench5. 1" wood dowel (Approx. 6" long)6. Thin blade screwdriver7. Two large blade screwdrivers8. Side cutters (for removing keys)9. Penetrating oil10. Adjustable spanner wrench11. 7/16" wrench or socket


Refer to Figure 4-12 for reference tothe numbered parts in theprocedures below.


2. Place pump horizontally onworkbench.

3. Remove the four (4) nuts (#20)from the guide rods (#18).

4. Remove the eight (8) nuts (#20)from the thru bolts (#19) locatedon the inlet cover (#1 or #1IN).Pull out the thru bolts.

Page 510

M50 • L50 SERIES

4.Service

Figure 4-8

Figure 4-7

will aid in removal. Refer toFigure 4-7.

9 o’clock, push the handles intoward the motor body, usingthe inlet cover for leverage.

c. In some cases, a rockingmotion of the screwdrivers willbe necessary to break theshaft loose. The inlet covershould also come off at thistime.

19. Remove the Seal Rotating Element(#12) from the shaft. Refer toFigure 4-9. The element normallyadheres tightly to the shaft, andsome force may be necessary toremove it. This is common, and ifcare is taken, the element can bereassembled and reused. It isrecommended that a newrotating element be used forreassembly. DO NOT attempt toremove the seal using ascrewdriver or other sharp object.Extensive damage to the shaft orelement could occur.

b. Remove the InducerImpeller (#11IN) from theshaft. The snap ring on theother end of the impeller canbe left on the shaft.

16. Remove the four (4) Guide Rods(#18). If the guide rods will notturn by hand, two of the Nuts(#20) can be jammed againsteach other on the guide rod anda wrench can then be used toloosen them.

17. Using the 5/32" hex wrench,loosen the Setscrews (#15) inthe Drive Collar (#14) located onthe shaft between the inlet coverand the motor face. The collarshould now be loose on theshaft.

18. Remove the Shaft (#17) andInlet Cover (#1 or #1IN). Theshaft is a keyed fit and isremoved using two largescrewdrivers. Refer to Figure 4-8.

a. Insert the blades of thescrewdrivers between thespringholder on the rotatingelement and the shoulder ofthe shaft.

b. Holding the screwdrivers atapproximately 3 o’clock and

Figure 4-9

20. On inducer pumps (L50 Series),the Seal Driver (#88) can beremoved from the shaft if it needsto be replaced.

21. Remove the Seal Stationary Seat(#125). Refer to Figure 4-10.

Figure 4-10

a. Place the inlet cover facedown on a flat surface.

b. Looking into the opening in thecenter of the inlet cover, you

5. Using a soft mallet, loosen theoutlet cover (#2) by lightlytapping around the outside edge.Slip the cover off the guide rods(#18), being careful not to bendthem.

6. Do not remove the plain bearing(#87) from the outlet coverunless it is worn. This bearing isa press fit and cannot beremoved without beingdamaged.

7. Remove the four (4) guide rod“O”rings (#8).

8. Mark on the outside surface ofthe channel rings (#9 & #10),such that the top to bottomrelationship, as well as the orderis maintained. Number stampsare preferable to less permanentmarkings that tend to be lostduring cleaning.

9. Separate the first channel ring(#9) by gently tapping the ringaround the outside edge with asoft mallet. Slide the channelring off the guide rods,exercising care to not damagethe guide rods. Should pryingbe necessary, it should be doneevenly and with great care.

10. Remove the interstage bushing(#16) from the channel ring (#9)just removed.

11. Remove the next channel ring(#10) using the same care aswith the first. The impeller (#11)will come off along with thechannel ring. Do not attempt topry the impeller off first, asprying will damage the impellervanes. Hold the impeller inplace when it reaches the end ofthe shaft so it does not fall.Refer to Figure 4-6.

12. Remove the impeller key (#23)

13. Remove the remaining channelrings, impellers, keys, andinterstage bushings. Stackingthe parts as they are removedwill help in maintaining theproper orientation. It isimportant to keep the impellerswith the same pair of channelrings.

You may find it easier todisassemble the pump further bystanding the pump up on the motorend when there are fewer stageson the pump.

For standard pumps (M50 Series), skipto step 16.

14. For inducer pumps (L50 Series),remove the inducer ring (#9IN).

15. Remove the inducer impeller.

a. Remove the snap ring (#14A)at the impeller hub. A smallpocket screwdriver will aid inremoval. Refer to Figure 4-7.

b. Remove the inducer impeller(#11IN) from the shaft. Thesnap ring on the other end ofthe impeller can be left on theshaft.

16. Separate tapered pump shaft fromadapter shaft or bearing frameshaft.

a. Remove fan shroud fromclose-coupled models orremove the coupling guardfrom models on a bearingframe.

b. Insert a 3/8” hex wrenchthrough the drain hole and intothe socket in the end of thepump shaft.

c. Using a 9/16” or 3/4”(depending on motor framesize) wrench or socket, loosen,but do not remove, the motordraw bolt (#120) or bearingframe thru bolt (#33D).

d. Tap sharply on the nut or headon the end of the thru bolt toseparate the tapers of the twoshafts, taking care not todamage the threads on thebolt.

17. Remove the motor draw bolt (orbearing frame thru bolt) completelyand remove the Shaft (#17).

18. Remove the Seal Rotating Element(#12) from the shaft. Refer toFigure 4-9. The element normallyadheres tightly to the shaft, andsome force may be necessary toremove it. This is common, and ifcare is taken, the element can be

reassembled and reused. Itis recommended that anew rotating element beused for reassembly. DONOT attempt to remove theseal using a screwdriver orother sharp object.Extensive damage to theshaft or element couldoccur.

19. On inducer pumps (L50Series), the Seal Driver(#88) can be removed fromthe shaft if it needs to bereplaced.

20. Before the Inlet Cover (#1 or#1IN) can be removed, thefour (4) Guide Rod “O”rings(#8) must be removed.

a. Gently tap on the backof the inlet cover,alternating between theleft and right side, untilthe Inlet Cover movesapproximately 1/4”.

b. Tap the inlet cover faceto move it back to itsoriginal position,exposing the Guide Rod“O”rings.

c. Remove the “O”rings bysliding them off theGuide Rods.

d. Slide the Inlet Coverstraight off. Do notattempt to remove theInlet Cover without firstremoving the “O”rings(#8).

21. Remove the stationary seat(#125). Refer to Figure 4-10.

a. Place the inlet coverface down on a flatsurface.

b. Looking into theopening in the center ofthe inlet cover, you willsee a portion of theseat.

c. Insert a 1" dowel, andvery gently, tap the seatuntil it drops out.

Figure 4-11

14A

14A

7

9 IN1 - 1IN

88

8

12523

17

P3 Bearing PedestalC3 Motors 1/3 to 3 HP

L50 (Inducer) Stage

127

23A

11 IN

7A

7A14

1520

M50 • L50 SERIES

4.Serviced. Care must be taken with the

seats. They are a brittlematerial and are prone tobreakage. It isrecommended that areplacement seat be usedduring reassembly.

22. For further disassembly ofmodels on a bearing frame, seeService 4C Bearing Pedestals,Disassembly (P30). Proceed tostep 23 for close-coupledmodels.

23. Remove the four (4) long hexscrews that hold the End Bell(#101) to the motor.

24. Pull the endbell assembly off themotor. If the taper of theadapter shaft in the motor shaftdid not separate, remove themotor fan and carefully pull outthe motor rotor. A sharp, carefulblow with a hammer on themotor shaft at the taper shouldfree the grip of the taper.

25. Remove the guide rod nuts andguide rods from the endbell.

26. With a spanner wrench,unscrew the Outboard BearingAdjusting Nut (#110A) from theendbell.

27. Support endbell with pumpmounting face up and press outadapter shaft/bearing assemblywith an arbor press. RemoveInboard Bearing Adjusting Nut(#110)

28. Disengage bearing lockwashertang from slot in the BearingLocknut (#38), using a thinblade screwdriver. RemoveBearing Locknut andLockwasher.

29. Place the shaft/bearingassembly in arbor press andremove the Bearing (#24).


4E Inspection of Components

Thoroughly clean all parts. Allcomponents should be examined for

QTY. PER PUMPKEYNO. NAME / DESCRIPTION

USEDON

1STG

2STG

3STG

4STG

5STG

1 Inlet Cover - Standard M50 N/A 1 1 1 1

1 IN Inlet Cover - Inducer L50 1 1 1 1 1

2 Outlet Cover All 1 1 1 1 1

7 "O" Ring - Casing All 4 5* 7* 9* 11*

7A "O" Ring All 1 1 1 1 1

8 "O" Ring - Guide Rod All 8 8 8 8 8

9 Channel Ring - Right Hand All 1 2 3 4 5

9 IN Diffuser Ring L50 1 1 1 1 1

10 Channel Ring - Left Hand All 1 2 3 4 5

11 Impeller All 1 2 3 4 511 IN Impeller - Inducer L50 1 1 1 1 1

12 Seal - Rotating Element All 1 1 1 1 1125 Seal Seat All 1 1 1 1 1

14 Drive Collar All 1 1 1 1 1

14A Snap Ring L50 2 2 2 2 2

15 Set Screws - Drive Collar All 2 2 2 2 2

16 Interstage Bushing All 1 2 3 4 5

17 Shaft All 1 1 1 1 1

18 Guide Rod All 4 4 4 4 4

19 Thru Bolt All 8 8 8 8 8

20 Nuts All 16 16 16 16 16

20A Nuts Horiz. 2 2 2 2 2

22 Pipe Plug - Drain (Not Shown) All 1 1 1 1 1

23A Drive Key All 2 2 3 4 5

31 Mounting Bracket Horiz. 1 1 1 1 1

33 Bolt Horiz. 2 2 2 2 2

41 Washer Horiz. 4 4 4 4 4

87 Plain Bearing All 1 1 1 1 1

88 Seal Driver L50 1 1 1 1 1

* Add one for L50 Inducer Pumps

Page 512

C3 - P3 CLOSE COUPLED PUMP

16

7

7

1110

716

9

711

10

87

8

2

19

18

20

31

20A41

3341

22 - Pipe Plug - Drain (Not Shown)

9

wear and corrosion. Replace anyparts that show visible wear. If thepump was not producing sufficientpressure or capacity, the clearancesbetween the casing and impellerprobably exceed the maximumallowable clearance. At minimum,the impellers should be replaced inthis case. If the total side runningclearance for an impeller exceeds.007", it is unlikely that pumpperformance will reach that of a newpump except at lower dischargepressures.

The “O” rings and other elastomericcomponents should be replaced ifthey have been deformed or cut.

If seal components must be reused,carefully inspect for microscopiccracks and nicks. Scratches thatmight be ignored elsewhere canproduce leakage if they are on sealcarbons and seat wearing surfaces.

Cleanliness is imperative whenworking with mechanical seals.Almost unnoticeable particlesbetween seal faces can be, and oftenare, the cause of early seal failures.

Check the impellers, they aredesigned to float. They should moveeasily on the shaft. As long as theycan be moved on the shaft by hand,they are loose enough. If theimpeller can be rocked or wobbled, itis too loose and must be replaced.

Check the sleeve or shaft for galling,pitting, and corrosion. If the shaft orsleeve is corroded where the sealcomes in contact with them, the shaftor sleeve must be replaced. Surfacecorrosion must be removed so thatseals can slide freely duringassembly. The shaft diameter shouldbe no smaller than .002" below thenominal fractional seal sizes.

Remove any nicks or burrs which mayhave occurred during disassembly.Reclean parts as necessary.

4F Reassembly Vertical Single Stageon C3 Motors

All parts should be visually inspectedand cleaned or replaced as outlined in4F above.

The following tools are needed forreassembly of C3 units.

1. 9/16" wrench or socket.2. 5/32" hex wrench.3. Soft plastic or wooden mallet.4. Cealube G or similar glycol base

lubricant. (DO NOT use petroleumproducts.)

To reassemble the pump:

Refer to Figure 4-4 for reference to thenumbered parts in the proceduresbelow.

1. The Seal Stationary Seat (#125)must be installed in the MotorBracket (#1) before the bracket isinstalled on the motor. To installthe seat:

a. Place the motor bracket faceup on a flat surface.

b. Carefully press the seat,smooth side up, into the seatcavity of the motor bracket. Tomake the installation of theseat easier, apply a thincoating of compatible lubricantto the elastomer portion of theseat prior to installation. Caremust be taken not to damagethe seat face. Thumbpressure is usually sufficient toinstall the seat.

2. Install the motor bracket.

a. Make sure the LockingCollar (#14) ispositioned on the motorshaft.

b. Thread two (2) GuideRods (#18) into the topholes of the motor face.(Use four (4) guide rodson stainless steelmodels).

c. While holding the motorbracket with the outletport facing up, slide thebracket over the guiderods until the feet areresting against themotor face. Lighttapping may benecessary to seat themotor bracket in theproper position.

d. Install two (2) “O” Ringson each of the (top) twoguide rods. This willhelp hold the bracket inplace during theremainder of theassembly operation.

3. Install the shaft sleeve androtating element as a unit.

a. Place the Shaft Sleeve(#17) in an uprightposition with the smallerend facing up.

b. Lubricate the shaftsleeve and SealRotating Element (#12).

c. Be sure to install aDrive Key (#23A) in themotor shaft beforeinstalling the sleeve andseal assembly.

d. Holding the elementassembly between thethumb and index fingerof both hands, slide theassembly over thesleeve until the springholder rests against theshoulder of the sleeve.Refer to Figure 4-13.

QTY. PER PUMP

KEY NO. NAME / DESCRIPTIONUSED

ON1

STG2

STG3

STG4

STG5

STG1 Inlet Cover - Standard M50 N/A 1 1 1 1

1 IN Inlet Cover - Inducer L50 1 1 1 1 12 Outlet Cover All 1 1 1 1 17 "O" Ring - Casing All 4 5 7 9 11

7A "O" Ring All 1 1 1 1 18 "O" Ring - Guide Box All 8 8 8 8 89 Channel Ring - Right Hand All 1 2 3 4 5

9 IN Diffuser Ring L50 1 1 1 1 110 Channel Ring - Left Hand All 1 2 3 4 511 Impeller All 1 2 3 4 5

11 IN Impeller - Inducer L50 1 1 1 1 112 Seal - Rotating Element All 1 1 1 1 1125 Seal Seat All 1 1 1 1 114A Snap Ring L50 2 2 2 2 216 Interstage Bushing All 1 2 3 4 517 Pump Shaft All 1 1 1 1 1

17A Motor Shaft P30 1 1 1 1 118 Guide Rod All 4 4 4 4 419 Thru Bolt All 8 8 8 8 820 Nuts All 16 16 16 16 16

20A Nuts Horiz. 2 2 2 2 222 Pipe Plug - Drain (Not Shown) All 1 1 1 1 123 Impeller Key All 2 2 3 4 5

23A Motor Shaft Key P30 1 1 1 1 124 Ball Bearing/Inboard P30 1 1 1 1 131 Mounting Bracket Horiz. 1 1 1 1 133 Bolt Horiz. 2 2 2 2 2

33D Bearing Frame Thru-bolt P30 1 1 1 1 138 Bearing Locknut P30 1 1 1 1 139 Bearing Lockwasher P30 1 1 1 1 141 Washer Horiz. 4 4 4 4 487 Plain Bearing All 1 1 1 1 188 Seal Driver L50 1 1 1 1 1101 End Bell P30 1 1 1 1 1110 Bearing Adjusting Nut - Inboard P30 1 1 1 1 1

110A Bearing Adjusting Nut - Outboard P30 1 1 1 1 1120 Motor Draw Bolt All 1 1 1 1 1

C30 - P30 CLOSE COUPLED PUMP

Page 514

M50 • L50 SERIES

4.Service

e. The element must slidefreely up and down on thesleeve. It is necessary tomaintain some downwardpressure on the elementbecause the spring tensioncould dislodge the sealportion of the element.

f. Holding the assembledsleeve between the thumband index finger, slide theassembly onto the motorshaft.

g. Push the sleeve on until itcomes in contact with thelocking collar.

h. Position the collar over thesleeve end and push thesleeve on until it stops.

i. While maintaining inwardpressure on the sleeve withone hand, line up the collarsetscrews with the key in theshaft sleeve, one setscrewon each side of the key.

j. Tighten the setscrewssnugly.

k. Pressure can now bereleased and the sleeveshould remain in position.The spring holder must bebelow the impellerwearing surface of themotor bracket for properimpeller operation.

4. Install the Impeller (#11).

a. Place an Impeller Key (#23)in the shaft sleeve.

b. The impeller is a slip fit andshould slide on firmly buteasily until it stops against theimpeller wearing surface.Force should not be requiredto install the impeller in thecorrect position.

c. The impeller hub should befacing out away from themotor bracket. Refer to Figure4-4.

d. If the impeller does not fit,repeat steps a. and b. todetermine the problem.

5. Place “O”Ring (#7) into the“O”Ring groove in the motor

bracket. It is helpful to stand themotor and pump assembly onend for this procedure.

6. Place the cover over the motorbracket and install the two (2) 3/8"X4" bolts (#19), and two (2)nuts (#20). Stainless steelmodels require four (4) nuts(#20). Tighten the bolts and/ornuts systematically, alternatingdiagonally across the cover.

7. After the bolts and/or nuts are“snugged up”, make sure theimpeller is not binding byinserting a 5/32" hex wrench intothe locking collar and moving itleft to right. The shaft should

Figure 4-13

Figure 4-12

7

16

7

7

11

10

7

16

911

10

87

8

2

19

18

20

31

20A41

3341

22 - Pipe Plug - Drain (Not Shown)

9

41

14A

14A

7

11 IN1 - 1IN

88

8

125

23

17

P30 Bearing Pedestal

L50 (Inducer) Stage

12

7

20

9IN

7A

7A

110A

110

17A

23A

2439

38

101

33D (Bearing Frame)

120 (Close Coupled)

rotate with little or no resistance. Ifthe shaft will not turn, loosen thebolts equally until the impellermoves freely.

Proceed to section 4I Testing andFinal Adjustment.

4G Reassembly Multistage on C3Motors / P3 Bearing Frames

All parts should be visually inspectedand cleaned or replaced as outlinedin 4E above.

The following tools and equipmentare needed for reassembly of C3 / P3units:

1. Soft plastic or wooden mallet.2. Two 9/16" wrenches or sockets.3. 5/32" hex wrench.4. Cealube G or similar glycol base

lubricant. (DO NOT usepetroleum products.)


Refer to Figure 4-11 for reference tothe numbered parts in thereassembly below.

1. Install the guide rods. Threadthe four (4) Guide Rods (#18)into the motor or bearing frameface. It is not necessary to turnthem in completely or tighten.About half of the thread lengthshould be fine.

2. The Seat Stationary Seat (#125)must be installed in the InletCover (#1 or #1IN) before thecover is installed on the motor.To install the seal seat:

a. Place the inlet cover face upon a flat surface.

b. Carefully press the seat,smooth side up, into theseat cavity of the inlet cover.To make the installation ofthe seat easier, apply a thincoating of glycol baselubricant to the elastomerportion of the seat prior toinstallation. Care must betaken not to damage theseat face. Thumb pressureis usually sufficient to installthe seat.

3. Install the Inlet Cover (#1 or1IN).

a. Make sure the Drive Collar(#14) is positioned on themotor shaft.

b. While holding the inlet coverwith the inlet port 180° fromthe motor conduit box (orvertically on horizontal units),slide the cover over the guiderods on the face.

c. Slide the inlet cover back untilthe feet are resting against theface. Light tapping may benecessary to seat the inletcover in the proper position.

d. Install one (1) “O” Ring (#8) oneach of the four guide rods.This will help hold the bracketin place during the remainderof the assembly operation.

4. On inducer pumps (L50 Series)install one Snap Ring (#14A) in thegroove nearest the drive end of theShaft (#17), and slide the SealDriver (#88) on the shaft.

5. Install the Shaft (#17) and SealRotating Element (#12) as a unit.

a. Lubricate the small end of theshaft and the rotating element.

b. Holding the element assemblybetween the thumb and indexfinger of both hands, slide theassembly over the shaft untilthe spring holder rests againstthe shoulder. Refer to Figure4-13.

c. The element must slide freelyup and down the shaft. It isnecessary to maintain somedownward pressure on theelement because the springtension could dislodge the sealportion of the element.

d. Install a Drive Key (#23A) inthe motor shaft beforeinstalling the shaft and sealassembly.

e. Align the keyway and slide thepump shaft over the motorshaft. Push the shaft in until itcomes in contact with the drivecollar.

f. Position the drive collar overthe shaft end and push theshaft on until it stops.

g. While maintaining inwardpressure on the shaft withone hand, line up the CollarSetscrews (#15) with thekey in the motor shaft,placing one setscrew oneach side of the keyway.

h. Using the hex wrench,tighten the set screwssnugly.

i. Pressure can now bereleased, and the sleeveshould remain in position.Make certain the springholder is below the topsurface of the seal cavityfor proper impelleroperation.

6. It is recommended that theassembly be placed vertically onthe motor or pedestal end forfurther assembly. Blocks can beused to steady the unit.

For standard (M50 Series) pumps,skip to step 9.

7. For inducer (L50 series), installthe Inducer Impeller (#11IN).Refer to the L50 Inducer StageInset in Figure 4-11.

a. Install an Impeller Key (#23)in the shaft by the drivecollar.

b. Slide the inducer impeller onthe shaft with the eye facingthe drive end.

c. Install the other Snap Ring(#14A) on the shaft at thehub of the inducer impeller.

8. Install the Diffuser Ring (#9IN).

a. Place an “O”Ring (#7) onthe raised step in thediffuser ring. You will needto stretch the “O”ring slightlyto do so.

b. Coat the “O”ring and the lipinside the inlet cover with asmall amount of glycol baselubricant.

c. With the “O”ring facing theinlet cover, slide the diffuserring onto the guide rods sothat it fits over the inducerimpeller. Push on firmly

c. Slide the channel ring intoplace with the water channelfacing up. This time,however, orient the largeinlet opening on the sideopposite of the pump inlet.Refer to Figure 4-18.

until the “O” ring fits inside the lipin the inlet cover. Refer toFigure 4-14.

a. Place an “O”Ring (#7) on theraised step in the channel ring.You will need to stretch the“O”ring slightly to do so.

b. Coat the “O”ring and lip inprevious ring with a smallamount of glycol baselubricant.

c. With the “O”ring facing the lefthand channel ring, slide thechannel ring onto the guiderods. The small outlet openingshould be on the same side asthe pump inlet. Refer toFigure 4-16. Push on firmlyuntil the “O” ring fits inside thelip in the left hand channelring. Refer to Figure 4-14.

Figure 4-14

9. Installation of the First Stage

a. Place the small “O”Ring(#7A) in to the groove in thehub of the inlet cover (#1 -1IN) or Diffuser Ring (#9IN)

b. Install an Impeller Key (#23)in the shaft.

c. Place an “O” ring (#7) on theraised step in the channelring. You will need tostretch the “O” ring slightlyto do so.

d. Coat the “O” ring and lip ininlet cover (or diffuser ring)with a small amount ofglycol base lubricant.

e. With the “O”ring facing themotor end, slide the channelring (#10) onto the guiderods with the water channelfacing up. The large inletopening should be on thesame side as the pump inlet.Refer to figure 4-15. Pushon firmly until the “O”ring fitsinside the lip in the inletcover (or diffuser ring).Refer to Figure 4-14.

Figure 4-15

Figure 4-16

Figure 4-17

Figure 4-19

Figure 4-18

10. Slide an Impeller (#11) on theshaft and over the drive key, withthe impeller hub facing themotor. Refer to Figure 4-11.

11. Install a Right Hand ChannelRing (#9).

12. Slide an Interstage Bushing (#16)onto the shaft. The bushing shouldbe oriented such that the end withthe screw is furthest from the motorand the screw head fits into theslot in the right channel ring. Referto Figure 4-17.

This completes one stage; a stageconsists of one Left Hand Channel Ring(#10), a Right Hand Channel Ring (#9),and an Impeller (#11) between them.Refer to Figure 4-11.

13. Install another Left Hand ChannelRing (#10).

a. Install an Impeller Key (#23) inthe shaft.

b. Place an “O”Ring (#7) on theraised step in the channel ring.Lubricate the “O”ring andinside lip in previous channelring.

14. Install another Impeller (#11),remembering to point theimpeller hub towards the motor.

15. Install another Right HandChannel Ring (#9).

a. Place an “O”Ring (#7) onthe raised step in thechannel ring and lubricate.

b. Slide the channel ring ontothe guide rods with thewater channel facing downtowards the impeller. Thesmall outlet opening shouldbe on the opposite side fromthe pump inlet. Refer toFigure 4-19. Push on firmlyuntil the “O”ring fits insidethe lip in the previouslyinstalled channel ring.

16. Slide an Interstage Bushing(#16) onto the shaft. Thebushing should be oriented suchthat the end with the screw isfurthest from the motor and thescrew head fits into the slot inthe right channel ring. Refer toFigure 4-17.

Continue installing stages dependingon how many stages are in the pumpby repeating steps 9 through 16.Remember to stagger

the ring sets to balance radial loads.The odd numbered stages shouldhave openings on the same side asthe pump inlet, as described in thefirst stage installation (steps 9through 12). The even numberedstages should have their openings onthe opposite side from the pumpinlet, as indicated (in steps 13through 16) for the second stage).

17. Install one (1) “O”Ring (#8) oneach of the four Guide Rods(#18)

18. Replace the Plain Bearing (#87)in the Outlet Cover (#2), if it hasbeen removed. If not, proceedto step 19. The bearing is aninterference fit and the OutletCover must be heated toapproximately 300°F beforepressing in. Allow the OutletCover to cool before proceedingwith the next step.

19. Install the Outlet Cover

a. Place an “O”Ring (#7) onthe raised step in the outletcover. You will need tostretch the “O”Ring slightlyto do so.

b. Coat the “O”Ring and lip inthe last right channel ring(#9) with a small amount ofglycol based lubricant.

c. With the “O”Ring facing thelast channel ring, slide theOutlet Cover (#2) over theGuide Rods. The outlet portshould be oriented 180°from the inlet port on closecoupled units. The outletport should be oriented onthe same side as the inletport on horizontal units.Push on firmly until the“O”Ring fits inside the lip ofthe channel ring. Refer tofigure 4-20.

20. Insert the eight (8) Thru Bolts (#19)through the holes in the outletcover and the inlet cover. Threadone (1) Nut (#20) on each of theeight Thru Bolts and on the end ofeach Guide Rod (#18). Using two9/16” wrenches or sockets, tightenthe bolts/nuts systematically,alternating diagonally across thecover, until they are about one fullturn short of being fully torqued.

21. After the bolts/nuts are “snuggedup”, make sure the impellers arenot binding by inserting the 3/8”hex wrench through the drain holein the Outlet Cover and in thesocket in the end of the shaft andturn. The shaft should rotate withlittle or no resistance. If the shaftwill not turn, loosen the boltsequally until the impellers movefreely.

Proceed to Section 4I Testing and FinalAdjustments

4H Reassembly Multistage on C30Motors / P30 Bearing Frames

All parts should be visually inspectedand cleaned or replaced as outlined in4E above.

The following tools and equipment areneeded for reassembly of C30 / P30units:

1. Soft plastic or wooden mallet.2. Two 9/16" wrenches or sockets.3. 3/4" wrench or socket4. Adjustable wrench.5. Adjustable spanner wrench.6. Thin blade screwdriver.7. 3/8" hex wrenches.8. Cealube G or similar glycol base

lubricant. (DO NOT use petroleumproducts.)

9. 7/16” wrench or socket


Refer to Figures 4-12 for reference tothe numbered parts in the reassemblybelow.

1. Using an arbor press, install theBearing (#24) on the MotorAdapter Shaft or Bearing FrameShaft (#17).

2. Install Bearing Lockwasher (#39)on the shaft, aligning internal tanginto the keyway in the shaft, andwith the external tangs facing away

from the bearing. Install BearingLocknut (#38) on shaft, withbeveled side facing the bearing.Tighten snuggly, using a driftpunch if necessary, until a slotlines up with a tang on thelockwasher. Using a thin bladescrewdriver, bend the tang intothe slot in the locknut.

3. Thread the Outboard BearingAdjusting Nut (#110A) into boreinside the Endbell (#101). Theadjusting nut should beapproximately flush with the topof the bore.

4. Place endbell, pump mountingsurface up, on the arbor pressface plate. Press shaft assemblyinto bearing bore until thebearing rests against theadjusting nut. Thread theInboard Bearing Adjusting Nut(#110) into the bore (thisadjusting nut has a left handthread). It is not necessary totighten the adjusting nutscompletely until the pump hasbeen assembled to the endbell,as some adjustment will benecessary.

5. Place endbell assembly verticallyon a workbench, elevatingendbell with blocks so theadapter shaft or bearing frameshaft clears the bench top.

6. Insert four (4) Guide Rods (#18)through the holes in the Endbell,and thread one (1) nut (#20)onto each of the guide rods.You may need to use moreblocks to hold the guide rods upagainst the back of the endbell.

7. The Seat Stationary Seat (#125)must be installed in the InletCover (#1 or #1IN) before thecover is installed on the motor.To install the seal seat:

a. Place the inlet cover face upon a flat surface.

b. Carefully press the seat,smooth side up, into theseat cavity of the inlet cover.To make the installation ofthe seat easier, apply a thincoating of glycol baselubricant to the elastomerportion of the seat prior toinstallation. Care must be

Figure 4-20

taken not to damage the seatface. Thumb pressure isusually sufficient to installthe seat.

8. Install the Inlet Cover (#1 or1IN).

a. Make sure the Drive Collar(#14) is positioned on themotor shaft.

b. While holding the inlet coverwith the inlet port 180° fromthe motor conduit box (orvertically on horizontalunits), slide the cover overthe guide rods on the face.

c. Slide the inlet cover backuntil the feet are restingagainst the face. Lighttapping may be necessaryto seat the inlet cover in theproper position.

d. Install one (1) “O” Ring (#8)on each of the four guiderods. This will help hold thebracket in place during theremainder of the assemblyoperation.

9. On inducer pumps (L50 Series)install one Snap Ring (#14A) inthe groove nearest the drive endof the Shaft (#17), and slide theSeal Driver (#88) on the shaft.

10. Install the Shaft (#17) and SealRotating Element (#12) as a unit.

a. Lubricate the small end ofthe shaft and the rotatingelement.

b. Holding the elementassembly between thethumb and index finger ofboth hands, slide theassembly over the shaft untilthe spring holder restsagainst the shoulder. Referto Figure 4-13.

c. The element must slidefreely up and down theshaft. It is necessary tomaintain some downwardpressure on the elementbecause the spring tensioncould dislodge the sealportion of the element.

d. Slide the shaft into the taper ofthe Adapter shaft or Bearingframe shaft. Push shaft inuntil it stops.

e. While maintaining inwardpressure on the shaft with onehand, insert the BearingFrame Thru Bolt (on units on abearing frame) or a 3/8-16 boltof the appropriate length (SeeChart 1 - for close coupledmodels) into the hole of thebearing frame shaft/adaptershaft. Thread the bolt into thepump shaft. You may nowrelease pressure from theshaft.

CHART 1

c. Install the other Snap Ring(#14A) on the shaft at thehub of the inducer impeller.

13. Install the Diffuser Ring (#9IN).

a. Place an “O”Ring (#7) onthe raised step in thediffuser ring. You will needto stretch the “O”ring slightlyto do so.

b. Coat the “O”ring and the lipinside the inlet cover with asmall amount of glycol baselubricant.

c. With the “O”ring facing theinlet cover, slide the diffuserring onto the guide rods sothat it fits over the inducerimpeller. Push on firmlyuntil the “O” ring fits insidethe lip in the inlet cover.Refer to Figure 4-14.

14. Installation of the First Stage

a. Place the small “O”Ring(#7A) in to the groove in thehub of the Inlet Cover (#1 -1IN) or Diffuser Ring (#9IN).

b. Install an Impeller Key (#23)in the shaft.

b. Place an “O” ring (#7) on theraised step in the channelring. You will need tostretch the “O” ring slightlyto do so.

c. Coat the “O” ring and lip ininlet cover (or diffuser ring)with a small amount ofglycol base lubricant.

d. With the “O”ring facing themotor end, slide the channelring onto the guide rods withthe water channel facing up.The large inlet openingshould be on the same sideas the pump inlet. Refer tofigure 4-15. Push on firmlyuntil the “O”ring fits insidethe lip in the inlet cover (ordiffuser ring). Refer toFigure 4-14.

15. Slide an Impeller (#11) on theshaft and over the drive key, withthe impeller hub facing themotor. Refer to Figure 4-12.

Motor Frame Bolt Length

180 4"210 4 1/2"250 5"

280 5"f. Insert 3/8” hex wrench into the

socket in the pump shaft andhold while tightening the bolt,drawing the two shaftstogether.

11. Look at the pump shaft betweenthe Endbell (#101) & Inlet Cover(#1 or #1IN). There should be ascribed line around the shaftvisible. This line is used to set theproper seal working height. Itshould line up with the machinedsurface of the Inlet Cover wherethe shaft goes through. If the lineis not visible or does not line upproperly, the shaft can be movedby tightening or loosening theBearing Adjusting Nuts (#110 &#110A) using the adjustablespanner wrench. Once the properlocation is established, bothBearing Adjusting Nuts must betightened against the bearing.

For standard (M50 Series) pumps, skipto step 14.

12. For inducer (L50 series), install theInducer Impeller (#11IN). Refer tothe L50 Inducer Stage Inset inFigure 4-12.

a. Install an Impeller Key (#23) inthe shaft by the drive collar.

b. Slide the inducer impeller onthe shaft with the eye facingthe drive end.

M50 • L50 SERIES

4.Service16. Install a Right Hand Channel

Ring (#9).

a. Place an “O”Ring (#7) onthe raised step in thechannel ring. You will needto stretch the “O”ring slightlyto do so.

b. Coat the “O”ring and lip inprevious ring with a smallamount of glycol baselubricant.

c. With the “O”ring facing theleft hand channel ring, slidethe channel ring onto theguide rods. The small outletopening should be on thesame side as the pump inlet.Refer to Figure 4-16. Pushon firmly until the “O” ringfits inside the lip in the lefthand channel ring. Refer toFigure 4-14.

17. Slide an Interstage Bushing(#16) onto the shaft. Thebushing should be oriented suchthat the end with the screw isfurther from the motor and thescrew head fits into the slot inthe right channel ring. Refer toFigure 4-17.

This completes one stage; a stageconsists of one Left Hand ChannelRing (#10), a Right Hand ChannelRing (#9), and an Impeller (#11)between them. Refer to Figure 4-12.

18. Install another Left HandChannel Ring (#10).

a. Install an Impeller Key (#23)in the shaft.

b. Place an “O”Ring (#7) onthe raised step in thechannel ring. Lubricate the“O”ring and inside lip inprevious channel ring.

c. Slide the channel ring intoplace with the water channelfacing up. This time,however, orient the largeinlet opening on the sideopposite of the pump inlet.Refer to Figure 4-18.

19. Install another Impeller (#11),remembering to point theimpeller hub towards the motor.

20. Install another Right Hand ChannelRing (#9).

a. Place an “O”Ring (#7) on theraised step in the channel ringand lubricate.

b. Slide the channel ring onto theguide rods with the waterchannel facing down towardsthe impeller. The small outletopening should be on theopposite side from the pumpinlet. Refer to Figure 4-19.Push on firmly until the “O”ringfits inside the lip in thepreviously installed channelring.

21. Slide an Interstage Bushing (#16)onto the shaft. The bushing shouldbe oriented such that the end withthe screw is further from the motorand the screw head fits into theslot in the right channel ring. Referto Figure 4-17.

Continue installing stages dependingon how many stages are in the pumpby repeating steps 14 through 21.Remember to stagger the ring sets tobalance radial loads. The oddnumbered stages should haveopenings on the same side as thepump inlet, as described in the firststage installation (steps 14 through 17).The even numbered stages shouldhave their openings on the oppositeside from the pump inlet, as indicated(in steps 15 through 21).

22. Install one (1) “O”Ring (#8) oneach of the four Guide Rods (#18)

23. Replace the Plain Bearing (#87) inthe Outlet Cover (#2), if it has beenremoved. If not, proceed to step24. The bearing is an interferencefit and the Outlet Cover must beheated to approximately 300°Fbefore pressing in. Allow theOutlet Cover to cool beforeproceeding with the next step.

24. Install the Outlet Cover

a. Place an “O”Ring (#7) on theraised step in the outlet cover.You will need to stretch the“O”Ring slightly to do so.

b. Coat the “O”Ring and lip in thelast right channel ring (#9) with

a small amount of glycolbased lubricant.

c. With the “O”Ring facing thelast channel ring, slide theOutlet Cover (#2) over theGuide Rods. The outlet portshould be oriented 180°from the inlet port on closecoupled units. The outletport should be oriented onthe same side as the inletport on horizontal units.Push on firmly until the“O”Ring fits inside the lip ofthe channel ring. Refer toFigure 4-20.

25. Insert the eight (8) Thru Bolts(#19) through the holes in theoutlet cover and the inlet cover.Thread one (1) Nut (#20) oneach of the eight Thru Bolts andon the end of each Guide Rod(#18). Using two 9/16”wrenches or sockets, tighten thebolts/nuts systematically,alternating diagonally across thecover, until they are about onefull turn short of being fullytorqued.

26. After the bolts/nuts are “snuggedup”, make sure the impellers arenot binding by inserting the 3/8”hex wrench through the drainhole in the Outlet Cover and inthe socket in the end of the shaftand turn. The shaft shouldrotate with little or no resistance.If the shaft will not turn, loosenthe bolts equally until theimpellers move freely.

For C30 (close coupled) modelsproceed to step 27. For models on aP30 Bearing Frame, continueassembling bearing frame asoutlined in Section 4F ReassemblyP30 Bearing Frames.

27. Remove the bolt installed in theadapter shaft in step 10 used todraw the shaft tapers together.

28. Install the motor over theendbell/pump assembly andtighten the four (4) long hexscrews that connect the motor tothe endbell. You may find iteasier to lay the unit on its sidefor this operation.

29. Insert the motor Draw Bolt(#120) into the hole in the motorshaft (on the fan end) and threadit into the pump shaft. Install thenut on end of the stud andtighten. You will need to holdthe pump shaft with the 3/8” hexwrench while tightening.

30. Install the Drain Plug (#22) in theOutlet Cover and install the fanshroud on the motor.

Proceed to Section 4I Testing andFinal Adjustment.

4I Testing and Final Adjustments

The pump is now ready forinstallation. Final adjustments will bemade with the pump in operation.

1. Reconnect the electricalconnections referring to thecolored or numbered tape used tomark the wires.

2. Connect all piping and fill the pumpwith fluid . Ensure the pump isproperly primed and vented, priorto operation. DO NOT RUN THEPUMP WITHOUT FLUID.

3. Make sure all valves are open, andfluid will flow through the system.

4. Start the pump and make the finaladjustments to the 3/8" bolts and/or nuts holding the cover on.These bolts and nuts must betorqued to about 20 ft. lbs. toobtain proper performance.

5. Check for leaks on pump and

BEARING PEDESTALS

A. PreliminaryB. Disassembly (P3)C. Disassembly (P30)D. Inspection of ComponentsE. Reassembly (P3)F. Reassembly (P30)G. Testing and Final Adjustments

4A Preliminary P3 and P30

1. Disconnect the inlet and outletpiping before unbolting thepump. If the pipes are corroded,use penetrating oil on thethreads to aid in removal.

2. Unbolt the pump from the baseand remove. Disassemblyinstructions for the pump arefound in Section 4, M50 • L50PUMP ENDS. All work on theunit should be performed on anelevated work-bench wheneverpossible.

The disassembly and reassemblyprocedures are broken into foursections covering the following units:

4B — Disassembly of the P3 BearingPedestals

4C — Disassembly of the P30Bearing Pedestals

4E — Reassembly of the P3 BearingPedestals

4.ServiceM50 • L50 SERIES

piping. Special attention shouldbe given to the seal area at therear opening in the motorbracket.

6. Under pressure, the impeller willfind its “hydraulic” balance.

7. Using an amprobe or similardevice, check for motoroverload.

8. While the impeller is finding itsbalanced position, it is commonto experience some variance inreadings. After a run-in periodthe readings should level off.

This completes the adjustment andtesting phase. The pump is ready forservice.

4F — Reassembly of the P30 BearingPedestals

Exploded views of each unit, Figures 4-27 and 4-28 are provided forreferencing the numbers in thefollowing procedures, i.e. Flinger (#21).

4B Disassembly (P3)

The following tools and equipment areneeded for disassembly of the P3 units:

1. Plastic or wooden mallet2. Arbor press or vise3. 3/4" X 6" piece of water pipe4. Internal snap ring plier5. Penetrating oil

When installing or removing bearingsfrom the shaft, the use of an arborpress is strongly recommended.

To disassemble the pedestal:

Refer to Figure 4-27 for reference tothe numbered parts in the proceduresbelow.

1. Remove the Flinger (#21) locatedon the pump end of the BearingPedestal (#3).

2. Using a snap ring plier, removeSnap Ring (#4).

3. Open the jaws of the viceapproximately 2-1/4".

4. Place the pedestal, pump sidedown, on the jaws. Refer toFigure 4-21

5. Using a plastic or wooden mallet,gently tap on the end of the shaftuntil it slides out of the frame.

Both bearings should come outwith the shaft. Do not use ametal hammer; severe damageto the shaft will occur.

Figure 4-21

Figure 4-22

M50 • L50 SERIES

4.Service

Figure 4-27 P3 Bearing Pedestal

30

23

17

244

213

33

24A

Figure 4-26

Figure 4-24

Figure 4-23

Figure 4-25

6. Using the arbor press, removethe two (2) Bearings (#24 &#24A) from the shaft. Refer toFigure 4-22. If the inner race iswell supported during thisoperation, no damage will bedone to the bearings.

If an arbor press is not available, abench vise may be substituted usingthe following procedure:

1. Remove the pedestal and closethe jaws to approximately 1-1/8".

2. Place the shaft with eitherbearing resting on top of thejaws and gently tap on the endof the shaft until the bearing isremoved. Refer to Figure 4-23.

end of a hammer handle or plasticmallet may be helpful. The shaftassembly should never be forcedor driven in.

the shoulder of the shaft. Referto Figure 4-26.

arbor face plate and the lowerbearing to insure properinstallation, and to preventbearing damage. The bearingsmust seat against the shoulderfor proper alignment. Refer toFigure 4-24.

*Also refer to Alternate bearinginstallation procedures.

2. Place the pedestal, pumpmounting surface up, in a vise orsuitable fixture and insert thebearing assembly. It should bepossible to install the shaftassembly with firm thumbpressure. Refer to Figure 4-25.If more force is required, the butt

3. Install the Snap Ring (#4) in thepump end of the pedestal. Be surethe snap ring is seated properly inthe groove. The beveled edge ofthe ring should face away from thebearing.

4. Install the Flinger (#21) over thesnap ring. The bearing pedestal isnow ready for pump and motorinstallation.

*Alternate bearing installationprocedures.

If an arbor press is not available, thebearings may be installed on the shaftusing the following procedure:

This procedure is not recommendedand should only be used in anemergency situation.

1. Stand a piece of 3/4" pipe, with thethreads cut off, on a workbench orsimilar flat surface, with thebearing placed on the correct shaftend.

2. Insert the shaft into the pipe so thebearing is between the pipe and

3. Using extreme caution, gentlytap on the end of the shaft untilthe bearing rests against theshoulder. Never attempt to installthe bearings by striking the outerrace.

4. Repeat steps 1-3 for the otherbearing.

4F Reassembly (P30)

All parts should be visually inspectedand cleaned or replaced as outlinedin 4D above. It is recommended thatthe bearings be replaced any timethe bearing pedestal is disassembledfor service.

The following tools and equipmentare needed for reassembly of P30units:

1. Arbor press2. Drift punch.3. Thin blade screwdriver4. Spanner wrench5. Rubber or plastic mallet6. 1 1/2" X 8" piece of water pipe7. 1 1/4" X 6" piece of water pipe

8. 7/16" wrench or socket9. 3/8" hex wrench

To reassemble the bearing frame:

Refer to Figure 4-28 for reference tothe numbered parts in thereassembly below.

1. Using an arbor press, install theInboard Bearing (#24) on theShaft (#17). A steel “donut” withthe proper inside diameter andoutside diameter, refer to Chart1, should be used between thearbor face plate and the bearingto insure proper installation, andto prevent bearing damage.Bearing must seat against theshoulder for proper alignment.

P3 & P30 BEARING PEDESTAL

KEY NO. NAME / DESCRIPTIONQuantity

P-3 P-303 Bearing Pedestal 1 14 Snap Ring / Bearing Retaining 1 017 Shaft 1 121 Flinger 1 023 Key 1 124 BallBearing / Inboard 1 1

24A Ball Bearing / Outboard 1 130 Coupling Guard 2 231 Bearing Frame Mounting Bracket 0 233 Capscrew 4 0

33A Capscrew 0 233B Hex Capscrew 0 433C Shoulder Screw 0 233D Thru Bolt - Shaft 0 138 Bearing Locknut 0 139 Bearing Lockwasher 0 1101 End Bell 0 1110 Bearing Adjusting Nut - Inboard 0 1

110A Bearing Adjusting Nut - Outboard 0 1

3

24A

33A

23

101

24

110

30

17

39

110A

38

33B

33C 31

31

33D

33C

33C

33AFigure 4-28 P30 Bearing Pedestal

Bearing (#24A) with the arborpress. Bearing must seat againstthe shoulder in shaft for properalignment.

*Alternate bearing installationprocedures.

If an arbor press is not available, thebearings may be installed on the shaftusing the following procedure:

This procedure is not recommendedand should only be used in anemergency situation.

1. Stand a piece of 1 1/2" pipe, with

the threads cut off, on aworkbench or other similarflat surface, with the bearingplaced on the correct shaftend.

2. Insert the shaft into the pipeso the bearing is betweenthe pipe and the shoulder ofthe shaft.

3. Using extreme caution,gently tap on the end of theshaft until the bearing restsagainst the shoulder. Neverattempt to install thebearings by striking theouter race.

CHART 1

P3 P30

I.D. 1" 1 5/16" - 1 1/2"O.D. 2" 2 3/4" - 3"

*Also refer to Alternate bearinginstallation procedures.

2. Install Bearing Lockwasher (#39)on the shaft, aligning internaltang into keyway in shaft, andwith external tangs facing awayfrom bearing. Install BearingLocknut (#38) on shaft, withbeveled side facing towardbearing. Tighten snuggly, usinga drift punch if necessary, until aslot lines up with a tang on thelockwasher. Using a thin bladescrewdriver, bend the tang intothe slot in the locknut.

3. Thread Outboard BearingAdjusting Nut (#110A) into boreinside the End Bell (#101).Adjusting nut should beapproximately flush with the topof the bore.

4. Place end bell, pump mountingsurface up, on the arbor pressface plate. Press shaft assemblyinto bearing bore until thebearing rests against theadjusting nut. Thread InboardBearing Adjusting Nut (#110)into bore. (This adjusting nuthas a left hand thread.) It is notnecessary to tighten theadjusting nuts completely untilthe pump has been assembledto the end bell, as someadjustment will be necessary.

5. Press shaft onto Outboard

4. Continue previous assemblysteps 2-4. Using a 1 1/4" pieceof pipe, with the threads cut off,repeat alternate assembly steps1-3 for the other bearing.

The end bell assembly is now readyto receive the pump assembly.Proceed to Section 4, M50 • L50PUMP ENDS, 4H ReassemblyMultistage on C30 Motors / P30Bearing Frames before completingbearing frame assembly.

After pump is assembled to end bellassembly, it is recommended that theassembly be placed vertically on thepump outlet end for further assembly.Blocks can be used to steady theunit.

To complete the bearing frameassembly:

1. Place Bearing Pedestal (#3)housing (with large openingdown) over the end bellassembly. Position the housingin such a way that the mountingbracket holes are perpendicularto the pump inlet. The ribbedportion of the housing shouldalso face the pump inlet. With asoft rubber or plastic mallet,carefully tap the housing intoplace on the outboard bearing.Make sure that the lip on thehousing enters the groove insidethe end bell snuggly.

2. Thread the four (4) Hex Capscrews(#33B) through the bearingpedestal and into the holes in theend bell. Tighten securely with a7/16" wrench or socket.

3. Attach the Bearing FrameMounting Brackets (#31) to theholes in the sides of the bearingframe housing with the ShoulderScrews (#33C), using a 3/8" hexwrench. Do not tighten untilmounting the pump assembly tothe metal base.

The bearing pedestal / pump assemblyis now ready for motor installation.

4G Testing and Final Adjustments

P3 Units:

1. Check to be sure that the rotatingassembly turns freely. Turn theshaft by hand. If it is tight or roughspots are encountered, it is likelythat at least one of the bearingswas damaged during disassembly/assembly operations, and will haveto be replaced.

2. Look to make sure that the lipseals on the bearings arepositioned properly in theirgrooves. Correct if necessary. Asthe bearings are turned, thegrooves should appear wet with oil,but have no visible grease present.

3. Recheck the snap ring on the largebearing end on P3 units. It should

be firmly in place, and no axialmotion should result from gentletapping on either end of theshaft. (Use a soft mallet so shaftsurfaces are not damaged.)

4. No adjustments are possible orrequired. Proceed with theappropriate pump end assemblyoperations. Refer to Section 4,Service - PUMP ENDS (Finaltesting is done after the pumpend is in place.)

P30 Units:

1. Check to be sure that therotating assembly turns freely.Turn the shaft by hand. If it istight or rough spots areencountered, it is likely that atleast one of the bearings wasdamaged during disassembly/assembly operations, and willhave to be replaced.

2. Look to make sure that the lipseals on the bearings arepositioned properly in theirgrooves. Correct if necessary.As the bearings are turned, thegrooves should appear wet withoil, but have no visible greasepresent.

3. Refer to Section 4, Service -PUMP ENDS, 4I Testing andFinal Adjustments.

5.M50 • L50 SERIES

TroubleshootingFLEXIBLE COUPLED PUMPSCLOSE COUPLED PUMPS

A. Failure to PumpB. Reduced CapacityC. Reduced PressureD. Pump Loses Prime After StartingE. Excessive Power ConsumptionF. Pump Vibrates or is NoisyG. Mechanical ProblemsH. Seal Leakage

5A Failure to Pump

1. Pump not up to speed — UseTachometer to determine actualRPM. Check voltage and wiringconnections.

2. Pump not primed — Confirm thatpump and all inlet piping arefilled with fluid.

3. Discharge head too high —Install a pressure gauge at thepump discharge to determine theactual operating pressure.Compare readings with pumpperformance curve. A largerpump may be necessary.

4. Excessive suction lift —Relocate pump, supply tank, orboth to minimize suction lift.

5. Wrong direction of rotation —Compare pump rotation witharrow on pump. Standardpumps rotate in a clockwisedirection when looking at theshaft extension end or from themotor end on close-coupledpumps. Reverse two leads on athree-phase motor to changerotation. Check motornameplate for single-phaseoperation.

6. Clogged suction line, strainer, orfoot valve — Inspect and cleanout if necessary.

7. Air pocket in suction line — Lookfor high spots in inlet pipingsystem. Evacuate the systemwith a vacuum pump ifnecessary.

5B Reduced Capacity

1. Pump not up to speed — Use atachometer to determine actualRPM. Check voltage and wiringconnections.

2. Excessive suction lift — Relocatepump, supply tank, or both tominimize suction lift.

3. Insufficient NPSH — Relocatepump, supply tank, or both toimprove NPSH available ifpossible. Increase suctionpressure. Reduce fluidtemperature. Select a pump withlower NPSH requirements.

4. Mechanical damage — Rotate thepump by hand to determine if thereare tight spots. Broken or bentimpeller vanes can sometimes bedetected in this manner. If there isa suspicion of damage, remove thepump from service anddisassemble for inspection.

5. Air leak in the suction line — Fillthe system with fluid andhydrostatically test. Tightenconnections or replace leakycomponents.

6. Air pockets in the suction piping —Operating the system at maximumflow conditions will usually clearthe lines. Evacuate the systemwith a vacuum pump if necessary.

7. Suction lines, strainer, or foot valvetoo small or clogged — Inspectand clean out as necessary.Fittings and lines should be at leastequal to the pump suction size.

8. Discharge head too high — Installa pressure gauge at the pumpdischarge to determine the actualoperating pressure. Comparereadings with pump performancecurve. A larger pump may benecessary.

9. Excessive wear — If a pump hadpreviously performed satisfactorilyand now gives evidence of

reduced performance, it shouldbe disassembled and examinedfor wear after the simplerpossible problems have beeninvestigated.

5C Reduced Pressure

1. Pump not up to speed — Use atachometer to determine actualRPM. Check voltage and wiringconnections.

2. Air or vapor in liquid — Install aseparator in the suction line.Check the seal on the inlet endof the pump to determine if air isbeing drawn in. Hydrostaticallytest the system to insure thatthere are no leaks.

3. Mechanical wear or damage —Rotate the pump by hand todetermine if there are tight spots.Broken or bent impeller vanescan sometimes be detected inthis manner. If there is asuspicion of damage or wear,remove the pump from serviceand disassemble for inspection.Look for wear on the impellerand channel rings.

4. System head less than expected— Replace pump with highercapacity unit or add a valve ororifice to increase lineresistance.

5D Pump Loses Prime AfterStarting

1. Leak in suction line — Fill thesystem with fluid andhydrostatically test. Tightenconnections or replace leakycomponents.

2. Air entering pump through inletseal or “O” rings —Hydrostatically test the pumpand look for leaks. Replacefaulty seals or “O” rings.

3. Insufficient NPSH or too muchsuction lift — Relocate pump,supply tank, or both to improveinlet conditions. Increase

suction pressure. Reduce fluidtemperature. Select a pump withlower NPSH requirements.

5E Excessive Power Consumption

1. Speed too high — Check RPMwith tachometer.

2. Discharge head too high —Install a pressure gauge at thedischarge to determine theactual operating pressure.Compare readings with pumpperformance curve. A differentpump, motor, or both may benecessary.

3. Specific gravity or viscosity toohigh — Check fluid involved. Adifferent motor may benecessary.

4. Mechanical damage — Turnpump over by hand. After a fewdays run-in period, all modelsshould turn over by hand with notight spots. An exception to thisis when the pump has been idlefor some time. In this case, runthe pump for a few hours beforechecking for tight spots. If thereis a suspicion of damage,remove the pump from serviceand disassemble for inspection.

5. Pump not fully “broken in” — It isnormal for new pumps toconsume higher than normalcurrent during the break-inperiod. If high powerconsumption persists beyond afew weeks, it is unlikely thatfurther operation will reduceconsumption.

6. Pump not properly adjusted —Loosen all nuts on pump exactlyone turn. Follow the instructionsin Section 4F Testing and FinalAdjustments, for repositioningfasteners.

5F Pump Vibrates Or Is Noisy

1. Pump and motor are misaligned— Follow the instructions inSection 2D Alignment, for properalignment.

2. Insecure mounting — Followinstructions in Section 2, 2BFoundation.

3. Piping load on pump — Installpiping supports and check to seethat there is no strain on the pump.

4. Mechanical damage — Ifmechanical damage is suspected,check first to determine if the pumpturns freely. Disassemble forinspection if tight spots are found.

5. Pump has a high pitched whine —This is typical of a regenerativeturbine pump. The intensity shouldincrease as pressure increases.Over a period of a few weeks thenoise level will diminish and will benoticeably quieter as it approachesa “run-in” condition.

5G Mechanical Problems

1. Short bearing life — Bearingsdamaged due to leaky seals.Coupling misalignment. Pipingload on pump. RPM or pumppressure too high.

2. Pump locked up — Pump dried outand close clearance areas rusted.Follow installation instructions forloosening the pump. Foreignmaterial in pump. Flush out.Disassemble if flushing is notsuccessful.

3. Pump leaks — Seal or “O” ringsare usually the problem.Disassembly and replacement isthe solution if tightening the thrubolts has no effect.

5H Seal Leakage

1. Worn seat or rotating element —Seals will last many yearsoperating on cold clear water orother fluids with reasonablelubricity. Particles, evenmicroscopic, increase normal wearrates. Temperatures near thefluid’s boiling point can reducelubricity, which in turn increaseswear. Some chemicals will erodethe seal faces or plate out on thefaces producing an abrasive effect.Immediate seal replacement isrecommended when leaks becomeevident, since bearings are quicklyruined when exposed to moisture.Severe mechanical damage resultswhen the bearings fail.

2. Improperly installed seat or rotating

element — If a seal has recentlybeen replaced, look for a missing“O” ring/cup around the seat, ora seat that was installed cockedor backwards. The smoothsurface should face the rotatingelement. The rotating elementmay be in backward orimproperly positioned. Refer tothe appropriate seal diagramsand instructions to confirm thecorrect seal orientation.Rotating elements sometimesstick in the wrong position if leftpartially assembled for sometime. Make sure a rotatingelement can be moved axially onthe shaft before closing up thepump, and then make the finaladjustments as soon aspossible.

3. Seat broken during assembly —Ceramic seats are particularlyvulnerable to damage. Carefullyfollow reassembly instructionsfor seals. Seals on flex-coupledunits can be damaged byexcessive hammering wheninstalling the coupling onto theshaft extension.

4. Pitted shaft under the seal —Reusing a shaft or sleeve whenrepairing a pump is the probablecause of this problem. The sealrotating element can produce apitted surface underneath itselastomer portion during normaluse. This is normally not aproblem for the first sealassembly since the elastomer isconforming as this action occurs.A new seal can leak before itconforms if the pits are largeenough. If any pits are visible tothe unaided eye, shaft or sleevereplacement is advised.

M50 • L50 SERIES

MTH Tool Company, Inc. / MTH Pumps,hereinafter referred to as “MTH”, war-rants for a period of twelve (12) monthsfrom the date of shipment (“The WarrantyPeriod”), that the pumps manufacturedby it will be free from defects in materialand workmanship. MTH will correct de-fects in material or workmanship whichmay develop in its products under properor normal use during the Warranty Periodand under the conditions of this Warran-ty. This Warranty does not extend toanyone except the original consumer-purchaser. Damage to the product due toimproper handling, improper storage,improper maintenance, or improper ap-plication is not covered by this Warranty.Warranty claims for motors, mechanicalseals, and accessories should be direct-ed to those who manufactured thecomponent. MTH will repair or replace, atits option and expense, its products

proved to be defective after examination bythe Company. The defective Product mustbe returned, transportation prepaid, to thefactory at Plano, Illinois. Disassembly of theequipment impairs determination of rea-sons for failure and shall be cause forvoiding this Warranty. The Product, re-paired or replaced, will be shipped f.o.b.MTH’s factory. This is MTH's sole warran-ty. MTH makes no other warranty of anykind, expressed or implied, and all im-plied warranties of merchantability andfitness for a particular purpose whichexceed MTH's aforestated obligationsare hereby disclaimed by MTH and ex-cluded from this warranty. MTH neitherassumes nor authorizes any person to as-sume for it, any other obligation inconnection with the sale of the Product andany enlargement of this Warranty by a pur-chaser shall be for its own account and itsexclusive responsibility. This Warranty

7.Limited Warrantyshall not apply to any Product or parts ofProducts which: (a) have been repairedor altered outside of MTH’s factory, in anymanner; or (b) have been subjected tomisuse, negligence or accident; or (c)have been used in a manner contrary toMTH’s printed instructions; or (d) havebeen damaged due to defective powersupply or faulty installation. MTH shallnot be liable for incidental and conse-quential losses and damages underthis express warranty, any applicableimplied warranty, or claims for negli-gence, except to the extent that thislimitation is found to be unenforce-able under the applicable State law.Some States do not allow the exclu-sion or limitation of incidental orconsequential damages, so the abovelimitation or exclusion may not applyto you. This warranty gives you spe-cific legal rights, and you may alsohave other rights which vary fromState to State.

6.Parts and Repair Services

M50 • L50 SERIES

A. PartsB. Repair ServiceC. Warranty ServiceD. Motors, Mechanical Seals,

and Accessories

6A Parts

Repair parts may be obtainedthrough your local Authorized MTHPumps Representative or Distributorwho can be found in the yellowpages or by contacting MTH Pumpsat:401 W. Main St. • Plano, IL 60545Phone: 630-552-4115Fax: 630-552-3688.

6B Repair Services

Repair service for an MTH pumpshould be obtained from thecompany through which it waspurchased.

In the event this is not possible, thename and phone number of a nearbyMTH representative or distributor maybe obtained by contacting MTH Pumps.In the event that it is necessary toreturn the pump to the factory forrepairs, remove all accessoriesattached to the pump. We cannotaccept responsibility for their saferemoval, storage, and return.

6C Warranty Service

All requests for warranty claims shouldbe made through the company fromwhich the pump was purchased orsupplied. Complete details on what iswrong with the pump must be providedalong with information on the system inwhich it is installed. Refer to the MTHPumps Limited Warranty statement.Return authorization must be obtainedprior to returning any equipment.

6D Motors, Mechanical Seals, andAccessories

Repair or replacement service onmotors, mechanical seals, reliefvalves, or other accessories shouldbe obtained from the manufacturer ofthese components. MTH does notcarry replacement parts and is notauthorized to render repair service onthese components. Replacementmechanical seals are stocked at MTHand are always available insofar aspossible for immediate shipment.Warranty service, as well as expertapplication information can beobtained from your local sealmanufacturer’s sales office.

Section M50 • L50 Page 528Dated January 2000

97-4624-01-588

MTH PUMPS401 West Main Street • Plano, IL 60545-1436Phone: 630-552-4115 • Fax: 630-552-3688

URL: MTHPUMPS.COMEmail: [email protected]

M50 PUMP MANUAL - Depco Pump

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