Section T41 Page 501Dated January 2000

97-4622-01-588

T41 SERIES

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

URL: MTHPUMPS.COMEmail: SALES@MTHPUMPS.COM

Pump ManualHORIZONTAL CLOSE COUPLEDVERTICAL FLANGE MOUNTEDFLEXIBLE COUPLED

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T41 SERIES

HORIZONTAL CLOSE COUPLED PUMPSVERTICAL FLANGE MOUNTED CLOSE COUPLED PUMPSFLEXIBLE COUPLED PUMPS

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 running clearancesare used to reduce internal losses.Abrasive particles, even microscopicones, in high enough concentrations,can open up the close clearancesbetween internal components. Forcritical services it is recommended thatyou keep an identical pump for stand-by use.

1A Inspection of Equipment

Immediately upon receipt of theshipment, inspect the equipment fordamage or missing components.Check the shipping manifest and reportany damage or shortage to theTransportation Company’s local agent.

Put the instructions that came with theshipment in a safe place where they willbe available to those who will be usingthem for installation and service.

1B Storage

If the pump is to be stored before use, itshould be inspected as described in 1A,recrated, and stored in a dry location.Standard shipping containers are notsuitable for outdoor storage. In someareas, it may be necessary to cover thepump’s exterior surface with oil or otherrust 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 or

lock collar, depending on the motor modelused. Applying torque to the motor fanblades is not recommended.

1D Application Considerations

1D1 Electrical Wiring

All electrical equipment and wiring shouldconform to local and National ElectricalCodes. Use the motor manufacturer’sinstructions for connecting the motor.Note the correct rotation and wiringdiagrams on the assembly. Make surethe motor rotation and speed matchesthat required for the pump.

1D2 Construction Materials

While it is reasonable to assume thatgood judgement has been used inselecting all the materials in the pump forcompatibility with process fluids, actualconditions sometimes vary from originalspecifications. Also, typical materialselection charts do not consider all thetemperature, pressure, and fluid vari-ables. The customer’s engineer shouldbe consulted for final judgement on thebest materials for critical processapplications.

1D3 Valves

The first valve to be considered for aregenerative turbine pumping systemmight be a pressure relief valve. Becausethis type of pump has a horsepowerrequirement similar to that of a positivedisplacement pump (constantly rising hpalong with pressure increases) a reliefvalve can be effectively used to limithorsepower. This is helpful when a non-overloading motor is specified. It can beof critical importance if the system flowrate can vary widely. There are almostno circumstances where a flow modulat-ing valve will work successfully in aregenerative turbine pumping system.The steep pumping characteristic, typicalof these pumps, produces very largepressure changes with small variations inflow rate. As a result, the modulating flowfrom the valve introduces sharp pressureshock waves that shorten pump life andmay cause damage to other pieces ofequipment in the system.

A swing check valve is recommended inthe suction line even when the pump inlet

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

ServiceD. Application ConsiderationsE. Recommended Spare Parts

is only slightly higher than the fluidsource. It should be the same size asthe pump inlet or sized based onreasonable fluid friction losses.

A foot valve is recommended whenlifting fluid from a sump. This will savewear and tear on any pump, even thoseequipped with self priming capability.

A Y-Strainer is recommended immedi-ately ahead of the pump on any newlyconstructed system. This is advisabledue to the probability that foreignmaterial large enough to damage pumpclearances may remain even thoughthe piping has been flushed.

Valves in the outlet piping of a regener-ative turbine pump should always beopen as far as possible when the pumpis started. This will reduce the start-upload on the pump and motor. Neverstart the pump with the discharge valveclosed.

Inlet valving should be open whenstarting any pumping system. Withoutsome fluid in the pump, it can gall andlock up the impellers. Violent pumpfailure will result from continuedoperation with the inlet valve closed.

1D4 Priming

Regardless of whether self-primingequipment is used or not, always fill thepump and vent it of air before starting,for best seal and pump life. Undermost circumstances, regenerativeturbine pumps can be made to self-prime as long as a small amount of fluidcan be recirculated through the impellerand the fluid doesn’t heat up noticeably.

1D5 NPSH (Net Positive SuctionHead)

The NPSH required varies with everysize and capacity of pump. The NPSHrequired by your unit can be obtainedfrom the performance curves or fromyour MTH representative.

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

1.General Instructions

By definition, NPSH means: “netpositive suction head” above the vaporpressure of the pumped liquid availableat the centerline of the pump. It shouldalways be given in feet of pumpedliquid. The NPSH is actually a mea-surement of the amount of energyavailable in the pumped liquid toproduce the required absolute entrancevelocity in the pump. If a pumprequires more energy (or NPSH) than isavailable at a given capacity, thepressure at the inlet will fall below thevapor pressure of the pumped liquidand loss of performance will result asthe liquid vaporizes.

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

NPSH = 2.31( )+ Hs- Hf

For boiling liquids, Ps and Pvp are equal.This item then becomes zero and canbe omitted from the equation.

1D6 Noise

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Regenerative turbine pumps typicallyproduce a high pitched whine thatincreases in intensity as the differentialpressure produced in the pump increas-es. While high frequency sound isattenuated more easily than lowerfrequencies, piping structures and thefluids in them readily transmit noise.Motors, bearings, and other rotatingcomponents add to the noise andsometimes create objectionable harmon-ics.

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

1D7 Freezing

When ambient temperatures drop belowthe freezing point of the fluid in a pump,consideration should be given to heating,insulating, or draining the pump. If youchoose to drain the pump, and it will onlybe for a short period, first remove thedrain plugs, then drain the inlet and outletlines. Carefully blow out the pump withcompressed air to clear all internalcavities of fluid.

1E Recommended Spare Parts

FOR CRITICAL SERVICES - a duplexinstallation, with two identical pumpingunits in parallel, is the safest and manytimes the most cost effective choice.

Ps - Pvp sp. gr.

FOR IMPORTANT SERVICES - astandby pump, ready for installation isadvised.

Special pricing and new pump warrantyis offered for factory rebuilding. Turnaround time can be as short as one ortwo days for standard models.

FOR ROUTINE MAINTENANCE - onlythe mechanical seals and a completeset of “O” ring gaskets are recommend-ed. Should additional componentsshow wear, they are available fromstock at the factory.

FOR SERVICING A PUMP THATDOES NOT PRODUCE RATED HEAD- mechanical seals, “O” ring gaskets,impeller, motor bracket, and cover.

FOR REBUILDING A PUMP - all thecomponents required for servicing, plusbearings, shaft, and drive keys forflexible coupled pumps, should beobtained. A factory rebuild should beconsidered whenever your disassemblyindicates rebuilding is necessary, asthis is usually more economical.

The factory recommendation for spareparts are all of those listed for rebuild-ing a pump, and are shown on theexploded view drawings for eachindividual type of pump.

Installation2.T41 SERIES

FLEXIBLE COUPLED PUMPSCLOSE COUPLED PUMPS

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

In order to insure that pumpingequipment is installed properly and toobtain reliable pump operation, it isrecommended that only experienced,qualified erecting engineers undertakethis task. Read the instructionsthoroughly 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 highest

inlet 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 notproperly primed and purged of air.

A dry, easily accessible location is alsoimportant. Allow ample clearance aroundthe unit for free air circulation. If a drylocation is not available, the pump can bemounted on a foundation, above the floor.Specify motor enclosure, pump materials,or coatings to suit the worst conditionsexpected. Place the pump so that it canbe easily inspected and serviced duringoperation. Sufficient head room shouldbe provided, particularly when liftingdevices will be used for heavier assem-blies.

2B Foundation

Baseplates alone are not rigid enough tomaintain alignment of the unit. The pump

foundation is used as a support for thebaseplate to maintain alignment of theunit. If the baseplate is to be grouted tothe foundation, it is only necessary toembed the edges. It is unnecessary tocompletely fill under the baseplate. DONOT grout the unit to the foundationuntil it has been properly aligned.

The foundation must be a permanentrigid installation of concrete or othermaterial of sufficient mass to absorb allnormal vibrations. Locate the founda-tion bolts using a layout or template inrelation to the suction and dischargepiping. If concrete is being used,foundation bolts of the specified sizecan be enclosed in a pipe sleeve two tothree diameters larger than the bolts tocompensate for minor variations inalignment.

Close coupled pumps can be mountedon a steel base prior to installation ormounted directly to the foundation.Place shims under one or more of themotor

1. Using a micrometer or caliper,measure from the outside of oneflange to the outside of the other atintervals around the periphery of thecoupling. DO NOT rotate thecoupling.

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

3. If the difference between themaximum and minimum exceeds theAngular dimension in Chart 1 foryour sleeve size, loosen the motoror pump and place thin metal shimsunder the motor or pump feet untilthe misalignment is corrected.

4. Torque down the motor or pump.

5. Recheck the parallel alignmentabove.

CHART 1

If the parallel or angular misalignmentis great, this is an indication of base-plate distortion and must be correctedfirst, refer to 2C Leveling.

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 bedowelled to the baseplate.

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Figure 2-1

feet so that strain and distortion will notresult when the mounting bolts aretightened.

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

b. Adjust the shims until the baseplateis not distorted.

5. Use a section of pipe to determine ifthe inlet and discharge openings arevertical and located properly.

6. Correct the positions, if necessary, byadjusting 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 following stepsafter the unit has been placed on thefoundation and leveled.

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

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

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 .070

If the unit is received with the pump andmotor mounted on the baseplate:

1. Place the unit in position.

2. Disconnect the coupling halves. Donot reconnect until all alignmentprocedures have been completed.

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

a. Place shims close to the founda-tion bolts. (Refer to Figure 2-3)

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 to wherethe greatest weight is located.

4. Check the baseplate for distortion:

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

Figure 2-4

A

1. Place a straightedge across the twocoupling flanges.

2. Measure the maximum offset (A),Figure 2-4, at various points aroundthe periphery of the coupling. DO NOTrotate the coupling.

3. If the maximum offset exceeds theParallel dimension in Chart 1 for yoursleeve size, loosen the motor or pumpand place thin metal shims under themotor or pump feet until the offset iscorrected.

4. Torque down the motor or pump.

5. Recheck alignment.

Figure 2-5

B

C

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2E Piping

2E1 Alignment

It is important that all piping be lined upand not forced into place. It is recom-mended that you begin piping at thepump. 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 ordistortion will result.

2E2 Piping Support

Never allow the pump to support piping.Other means such as pipe hangers andpipe supports should be used to carrypiping to avoid misalignment and distor-tion. Consideration should be given tothermally induced expansion andcontraction, particularly in long runs ofstraight pipe.

2E3 Piping Size

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

T41 SERIES

FLEXIBLE 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 performance varia-tions 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 direction ofthe arrow.

3.OperationIf the motor operates in the wrongdirection:

1. Interchange any two leads on a threephase motor.

2. On a single phase motor, change theleads as indicated on the connectionbox cover. Some single phase motorsmay not be reversible.

3B Inlet and Outlet Locations (Refer toFigure 3-1)

The pump inlet is located on the endfarthest from the motor. The discharge or“outlet” can be on the top, side, or bottomdepending on the model and constructionof the pump. Normal discharge position ison top.

3C Foreign Material

All regenerative turbine pumps have closerunning clearances in order to maintainefficiency. Take extra precautions toinsure that no foreign material larger than25 microns or .001 inches is allowed topass through the pump. Even particles ofthis size can damage the pump if allowedto circulate continuously. Regenerativeturbine pumps are not designed forslurries.

Large particles, weld spatter, and othermaterial found in new piping systems willbend the impeller vanes and can some-times lock up the pump. If a new pump

does not operate properly, the first thingto check for is damage from foreignmaterial.

3D Electrical

It is important to be aware of and followthe appropriate local and nationalelectrical codes. Do not make wiringalterations that can affect motor rotationwithout reconfirming correct rotation.

3E Adjustments

No adjustments are necessary oradvisable on new pumps other thanthose required for installation. Becauseof the close fits in regenerative turbinepumps, it is not uncommon for thepump to be difficult to turn over by handafter the internal parts have beenallowed to dry out. New pumps fromthe factory are tested using rustinhibitors to help preclude this possibili-ty. On site system flushing may removethese inhibitors and subject the pump tothe risk of lock up, if it is allowed to dryout. In this case, do the following:

1. Fill the pump with fluid (wait 2hours).

2. Insert 5/32" Allen wrench into lockcollar setscrew and rotate shaft,using the Allen wrench as a handle.(DO NOT LOOSEN THE SET-SCREW)

Figure 3-1

Outlet

Rotation

RotationOutlet

InletRotation

Inlet

Outlet

Inlet

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3. Remove the Allen wrench.

4. Jog the pump momentarily using theon/off buttons if so equipped.

5. This should “break” the impellerloose without damage, unless foreignmaterial has entered the pump.

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 these proce-dures are followed carefully, nodamage will result from "breaking loose"the impeller.

3F Cooling Water

When the pump is used to transfer hotfluids, consideration should be given tocooling the seals and/or selectingmaterials that will give satisfactory seallife. The actual temperature at the sealfaces, the most critical area, will alwaysexceed the surrounding fluid temperature.

3G Priming

Pumps should not be operatedunless they are completely filled withliquid. Damage to parts of the pump thatdepend on liquid for their lubrication canoccur. Impellers can seize quickly when apump is run dry. Without lubrication, sealfaces can be damaged from heat buildup.

3H Starting

Before starting a pump for the first time,be sure that all the preceding operationshave been carried out. Proper rotation,priming, and a free turning pump are mostimportant.

1. Start the pump with the minimumpossible line restriction.

2. Open discharge valves beforepressing the starter.

3. Start the pump and let the systemclear 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 undue loador other sounds indicating problems.

7. Use a clip-on ammeter to check for asteady load after approximatelyfifteen minutes of operation.

3I Stopping

It is best to stop the pump with the leastdischarge head possible both forminimizing strain on components, andto be in low power mode in anticipationof restarting.

4.ServiceT41 SERIES

PUMP ENDS

A. PreliminaryB. Disassembly C3 & P3C. Disassembly C15 & P15D. Inspection of ComponentsE. Reassembly C3 & P3F. Reassembly C15 & P15G. Testing and Final Adjustments

4A Preliminary

Before attempting any service on thepump or motor, disconnect the electricalpower to the motor. If the pump andmotor are to be removed as a unit, notethe wiring configuration.

1. Disconnect the inlet and outlet pipingbefore unbolting the pump andmotor.

2. Unbolt the motor from the base andremove the unit. All work on the unitshould be performed on an elevatedworkbench whenever possible.

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

4B — Disassembly of the C3 and P3Units (3 hp and under)

4C — Disassembly of the C15 and P15Units (5 hp and up)

4E — Reassembly of the C3 and P3 Units4F — Reassembly of the C15 and P15

Units

Exploded views of each unit, Figures 4-4,4-5, 4-11, and 4-12, are provided forreferencing the numbers in the followingprocedures, i.e. (#1), motor bracket.

4B Disassembly (C3 and P3)

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

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.8. Cealube G or similar glycol base

lubricant. (DO NOT use petroleumproducts.)

To disassemble the pump:

Refer to Figures 4-4 and 4-5 for referenceto the numbered parts in the proceduresbelow.

1. Remove all liquid from the pump. Airblown through the pump will removethe water quickly.

2. Remove the four (4) 3/8" X 4" bolts(#19) from the cover (#2).

3. Remove the cover. In some caseslight tapping with a plastic or woodenmallet on the outside diameter of thecover may be required to loosen itfrom the motor bracket. Care shouldbe taken if a screwdriver is neededto pry between the cover and motorbracket. Damage to the “O” ring(#7) and/or impeller can result.

4. Remove the impeller (#11), refer toFigure 4-1. The impeller is a slip fitand, under normal conditions, canbe removed by gently tapping on theend of the shaft sleeve with a mallet.Leave the impeller key (#23) inplace. Striking the sleeve too hardcould damage the seat or rotatingelement.

Figure 4-1

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5. Using the 5/32" hex wrench, loosenthe set screws (#15) in the lockingcollar (#14), located on the shaftsleeve between the motor bracketand the motor face. The collarshould now be loose on the sleeve.Note the condition of the setscrew inthe collar and replace if necessary.

6. Remove the shaft sleeve (#17). Thesleeve is a keyed fit and is removedusing two large screw drivers, Referto Figure 4-2.

7. In some cases a rocking motion of thescrewdrivers will be necessary tobreak the sleeve loose. Normally therotating element will slide off with thesleeve. DO NOT attempt to removethe sleeve by rotating it. (Previousmodels have used a threaded shaftand different procedures are requiredin these cases.)

Figure 4-2

a. Insert the blades of the screwdriv-ers between the spring holder onthe rotating element and theshoulder of the shaft sleeve.

b. Holding the screwdrivers atapproximately 3 o’clock and 9o’clock, push the handles intoward the motor body, using themotor bracket for leverage.

Figure 4-3

8. Remove the rotating element from thesleeve. Refer to Figure 4-3. Theelement normally adheres tightly to thesleeve and some force may benecessary to remove it. This iscommon and if care is taken, theelement can be reassembled andreused. It is recommended that anew rotating element be used forreassembly. DO NOT attempt toremove the seal using a screwdriver orother sharp object. Extensive damageto the shaft, sleeve, or element couldoccur.

9. Remove the motor bracket. Themotor bracket will come loose oncethe shaft sleeve and rotatingelement have been removed.

10.Remove the seat portion of the seal,Refer to Figure 4-6.

Figure 4-422 Drain Plug (not shown)

14

15125

23A

11

17

12

23

7

C3

P3

1

2

19

NAME/DESCRIPTION PART NO. QTY.Motor Bracket 1 1Cover 2 1

"O" Ring/Casing 7 1Impeller 11 1

Seal Rotating Element 12 1

Seal Stationary Seat 125 1

Lock Collar/Sleeve 14 1Setscrew/Lock Collar 15 2Shaft Sleeve 17 1Guide Rod (Qty. 4 on Stainless Steel) 18 0

ThruBolt (Qty. 0 on Stainless Steel) 19 4Nut (Qty. 4 on Stainless Steel) 20 0

Pipe Plug/Drain 22 1

Key/Impeller Drive 23 1Key/Sleeve Drive 23A 1

C3 - P3 CLOSE COUPLED PUMP

Figure 4-6

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

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

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c. Insert the 1" dowel and, verygently, tap the seat until it dropsout.

d. Care must be taken with theseats. They are often a brittlematerial and are prone tobreakage. It is recommendedthat a new replacement seat beinstalled during reassembly.

4C Disassembly (C15 and P15)

The following tools and equipment areneeded for disassembly of C15 andP15 units.

1. Soft plastic or wooden mallet.2. 9/16" wrench or socket.3. Two 10" or larger adjustable

wrenches.4. Penetrating oil.5. 1" wood dowel (Approx. 6" long).6. Thin blade screwdriver.7. Two large blade screwdrivers.8. Cealube G or similar glycol base

lubricant. (DO NOT use petroleumproducts.)

To disassemble the pump:

Refer to Figures 4-11 and 4-12 forreference to the numbered parts in thedisassembly below.

1. Remove all liquid from the pump.

2. Remove the four (4) 3/8" X 4" bolts(#19) from the cover. (#2)

3. Remove the cover. In some cases,light tapping with a plastic or woodenmallet on the outside diameter of thecover may be required to loosen itfrom the motor bracket. Care shouldbe taken if a screwdriver is neededto pry between the cover and motorbracket. Damage to the “O” ring(#7) and/or impeller can result.

4. Remove the impeller (#11), refer toFigure 4-7. The impeller is a slip fitand, under normal conditions, canbe removed by gently tapping on theend of the shaft sleeve with a mallet.Leave the impeller key (#23) inplace. Striking the sleeve too hardcould damage the seat or rotatingelement.

5. Remove the impeller drive hub, Referto Figure 4-8. Two (2) adjustablewrenches are used to remove theimpeller drive hub (#14).

7. Remove the motor bracket. Themotor bracket will come loose oncethe drive sleeve and rotatingelement have been removed.

8. Remove the seat portion of the seal.Refer to Figure 4-10.

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

Figure 4-8

Figure 4-7

a. Adjust one wrench to fit over thesleeve and engage the impeller key.Adjust the second wrench to fit theimpeller nut (#15).

b. Holding both wrenches, turn theimpeller nut counter-clockwise.

c. After the impeller nut is removed,the impeller drive hub can beremoved.

d. The hub is keyed and can beremoved using two large bladedscrewdrivers.

e. Insert the blades of the screwdriversbetween the springholder on therotating element and the shoulder ofthe hub.

f. Holding the screwdrivers atapproximately 3 o’clock and 9o’clock, push the handles in towardthe motor body, using the motorbracket for leverage. Refer toFigure 4-9. This procedure usuallydoes not require excessive force.Care should be taken not todamage the hub or motor shaft.

Figure 4-9

6. Remove the rotating element from theshaft. The element normally adherestightly to the motor shaft and someforce may be necessary to remove it.This is common and if care is taken,the element can be reassembled andreused. It is recommended that anew rotating element be used forreassembly. DO NOT attempt toremove the seal using a screwdriver orother sharp object. Damage to theshaft or element can occur.

Figure 4-10

b. Look into the opening in thecenter of the bracket, you will seea portion of the seat.

c. Insert the 1" dowel, and verygently, tap the seat until it dropsout. Care must be taken with theseats. They are often a brittlematerial and are prone tobreakage. It is recommendedthat a new replacement seat beinstalled during reassembly.

4D Inspection of Components

Thoroughly clean all parts. All compo-nents should be examined for wear andcorrosion. Replace any parts that showvisible wear. If the pump was notproducing sufficient pressure orcapacity, the clearances between thecasing and impeller probably exceedthe maximum allowable clearance. Atminimum, the impellers should bereplaced in this case. If the total siderunning clearance for an impellerexceeds .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 if theyhave been deformed or cut.

If seal components must be reused,carefully inspect for microscopic cracksand nicks. Scratches that might beignored elsewhere can produceleakage if they are on seal carbons andseat wearing surfaces.

Page 509

Cleanliness is imperative when workingwith mechanical seals. Almostunnoticeable particles between sealfaces can be, and often are, the causeof early seal failures.

Check the impellers, they are designedto float. They should move easily onthe shaft. As long as they can bemoved on the shaft by hand, they areloose enough. If the impeller can berocked or wobbled, it is too loose andmust 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 shaft orsleeve must be replaced. Surfacecorrosion must be removed so thatseals can slide freely during assembly.The shaft diameter should be nosmaller than .002" below the nominalfractional seal sizes. Remove anynicks or burrs which may have occurredduring disassembly. Reclean parts asnecessary.

4E Reassembly (C3 and P3)

All parts should be visually inspected andcleaned or replaced as outlined in 4Dabove.

1. The seal seat (#125) must be installedin the motor bracket before the bracketis installed on the motor. To install theseat:

a. Place the motor bracket face up ona flat surface.

b. Carefully press the seat, smoothside up, into the seat cavity of themotor bracket. To make theinstallation of the seat easier, applya thin coating of compatiblelubricant to the elastomer portion ofthe seat prior to installation. Caremust be taken not to damage theseat face. Thumb pressure isusually sufficient to install the seat.

2. Install the motor bracket.

a. Make sure the locking collar ispositioned on the motor shaft.

b. While holding the motorbracket with the outlet portfacing up, install two of thethru bolts into the motor faceto temporarily hold the motorbracket in place.

c. Slide the bracket back untilthe feet are resting againstthe motor face. Light tappingmay be necessary to seatthe motor bracket in theproper position.

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

a. Place the sleeve in anupright position with thesmaller end facing up.

b. Lubricate the shaft sleeveand rotating element.

c. Be sure to install a key(#23A) in the motor shaftbefore installing the sleeveand seal assembly.

125

12

23

23A

19

7

11

2

60

15

14

1

Figure 4-5

17

C3

Figure 4-13

d. Holding the elementassembly between the thumband index finger of bothhands, refer to Figure 4-13,slide the

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Page 510

T41 SERIES

4.Serviceassembly over the sleeve until the

spring holder rests against theshoulder of the sleeve.

e. The element must slide freely upand down on the sleeve. It isnecessary to maintain somedownward pressure on theelement because the springtension could dislodge the sealportion of the element.

f. Holding the assembled sleevebetween the thumb and indexfinger, slide the assembly ontothe motor shaft.

g. Push the sleeve on until it comesin contact with the locking collar.

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

i. While maintaining inwardpressure on the sleeve with onehand, line up the collar setscrewswith the key in theshaft sleeve, one setscrew oneach side of the key.

j. Tighten the setscrews snugly.

k. Pressure can now be releasedand the sleeve should remain inposition. The spring holder mustbe below the impeller wearingsurface of the motor bracket forproper impeller operation.

4. Install the impeller.

a. Place a key (#23) in the shaftsleeve.

b. The impeller is a slip fit andshould slide on firmly but easilyuntil it stops against the impellerwearing surface. Force shouldnot be required to install theimpeller in the correct position.

c. The impeller hub should befacing out away from the motorbracket. Refer to Figure 4-4 and4-5.

d. If the impeller does not fit, repeatsteps a. and b. to determine theproblem.

5. Place “O” ring (#7) into the “O” ringgroove in the motor bracket. It ishelpful to stand the motor and pumpassembly on end for this procedure.

6. Remove the thru bolts installed in 2b.Place the cover over the motor bracketand install the four (4) 3/8"X4" bolts.Tighten the bolts systematically,alternating diagonally across the cover.

7. After the bolts are “snugged up”, makesure the impeller is not binding byinserting a 5/32" hex wrench into thelocking collar and moving it left to right.The shaft should rotate with little or noresistance. If the shaft will not turn,loosen the bolts equally until theimpeller moves freely.

Proceed to section 4G Testing and FinalAdjustment.

4F Reassembly (C15 and P15)

All parts should be visually inspected andcleaned or replaced as outlined in 4Dabove.

1. The stationary seat (#125) must beinstalled in the motor bracket before thebracket is installed on the motor. Toinstall the seat:

a. Place the motor bracket, face up, ona flat surface.

b. To make the installation of the seateasier, apply a thin coating ofcompatible lubricant to the elas-tomer portion of the seat prior toinstallation.

c. Carefully press the seat, smoothside up, into the seat cavity of themotor bracket. Care must be takennot to damage the seat face.Thumb pressure is usually sufficientto install the seat.

2. Install the motor bracket.

a. While holding the motor bracketwith the outlet port facing up, installtwo of the thru bolts into the motorface, to temporarily hold the motorbracket in place.

b. Slide the bracket back until the feetare resting against the motor face.Light tapping may be necessary toseat the motor bracket in the properposition.

3. Install the sleeve hub and rotatingelement as a unit.

a. Place the sleeve in an uprightposition with the smaller end facingup.

b. Lubricate the motor shaft with asmall amount of glycol basedlubricant.

c. It is generally easier to removethe entire head or sealingassembly from the spring andinstall it on the motor shaft. Thisassembly lifts out of the rotatingelement spring.

d. After removal, apply a thin layerof lubricant to the elastomerportion of the seal.

e. Holding the head assemblybetween the thumb and indexfinger with the sealing facepointing toward the stationaryseat, slide the assembly over themotor shaft until it rests againstthe seat. Refer to Figure 4-14. Aslight twisting motion will allowthe assembly to slide more easily.

Figure 4-14

f. Check to see that the headassembly is against the seat face.

g. Position the rotating elementspring with the spring holderresting against the shoulder of thesleeve hub.

h. Align the keyway slot in the hubassembly with the key in themotor shaft, refer to Figure 4-15.

Figure 4-15

i. Slide the hub and spring assem-bly over the shaft until the hub isproperly seated and the spring ispositioned correctly on therotating element head previouslyinstalled. Refer to Figure 4-11and 4-12.

Page 511

j. While maintaining inwardpressure on the hub, install theimpeller nut. Refer to Figure 4-16.

Figure 4-16

Figure 4-17

k. Tighten the nut as far as possibleby hand.

l. Pressure can now be released .

m. To tighten the nut, place acrescent wrench over the hubsleeve and engage the drive key.

n. Place a second crescent wrenchover the nut and tighten in aclockwise direction until it issecured. Refer to Figure 4-17.

4. Install the impeller.

a. The impeller is a slip fit and shouldslide on firmly but easily until itstops against the impeller wearingsurface. Force should not berequired to install the impeller in thecorrect position.

b. The impeller hub should be facingout away from the motor bracket.

c. If the impeller does not fit, repeatsteps a. and b. to determine theproblem.

5. Place “O” ring (#7) into the “O” ringgroove in the motor bracket. It ishelpful to stand the motor and pumpassembly on end for this procedure.

6. Remove the thru bolts installed in 2a.Place the cover over the motor bracketand install the four (4)3/8"x4" bolts.Tighten the bolts systematically,alternating diagonally across the cover.Do not over-tighten the bolts. Finaladjustment will be made after the unitis in operation.

4G Testing and Final Adjustment

The pump is now ready for installation.Final adjustments will be made with thepump in operation.

1. Reconnect the electrical connectionsreferring to the colored or numberedtape used to mark the wires.

2. Connect all piping and fill the pumpwith 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 holdingthe cover on. These bolts must betorqued to about 20 ft. lbs. to obtainproper performance.

5. Check for leaks on pump and piping.Special attention should be given tothe seal area at the rear opening inthe motor bracket.

6. Under pressure, the impeller will findits “hydraulic” balance.

7. Using an amprobe or similar device,check for motor overload.

8. While the impeller is finding itsbalanced position, it is common toexperience some variance inreadings. After a run-in period thereadings should level off.

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

C15 - P15CLOSE COUPLED PUMP

Figure 4-11

C15

P15

1

23A 125

23

1411

7

2

12

19

15

22 Drain Plug (not shown)

NAME/DESCRIPTION PART NO. QTY.Motor Bracket 1 1

Cover 2 1

"O" Ring/Casing 7 1

Impeller 11 1

Seal Rotating Element 12 1

Seal Stationary Seat 125 1

Drive Sleeve/Impeller Drive 14 1

Impeller Nut 15 2ThruBolt 19 4

Pipe Plug/Drain 22 1

Key/Impeller Drive 23 1Key/Sleeve Drive 23A 1

Page 512

C15 VERTICALFLANGE MOUNT PUMP

Figure 4-12

125

12

14

11

15

23

60

19

27

1

23A

NAME/DESCRIPTION PART NO. QTY.Motor Bracket 1 1Cover/Vertical 2 1"O" Ring/Casing 7 1Impeller 11 1Seal Rotating Element 12 1Seal Stationary Seat 125 1Drive Sleeve/Impeller Driver 14 1Impeller Nut 15 1ThruBolt 19 4Nut 20 2Key/Impeller Drive 23 1Key/Sleeve Drive 23A 1Gasket 60 1

C15

4.ServiceT41 SERIES

BEARING PEDESTALS

A. PreliminaryB. DisassemblyC. Inspection of ComponentsD. ReassemblyE. Testing and Final Adjustments

4A Preliminary (P3 and P15)

1. Disconnect the inlet and outletpiping before unbolting the pump. Ifthe pipes are corroded, use pene-trating oil on the threads to aid inremoval.

2. Unbolt the pump from the base andremove. Disassembly instructionsfor the pump are found in section 4,T41 PUMP ENDS. All work on theunit should be performed on anelevated work-bench wheneverpossible.

The disassembly and reassemblyprocedures are broken into two sectionscovering the following units:

4B — Disassembly of the P3 and P15Bearing Pedestals

4D — Reassembly of the P3 and P15Bearing Pedestals

Exploded views of each unit, Figures 4-19and 4-20 are provided for referencing thenumbers in the following procedures, i.e.flinger (#21).

4B Disassembly (P3 and P15)

The following tools and equipment areneeded for disassembly of the P3 andP15 units:

1. Soft plastic or wooden mallet.2. Arbor press or vise.

3. 3/4" X 6" piece of water pipe for P3,1-1/4" X 6" for P15.

4. Internal snap ring plier.5. Penetrating oil.

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

To disassemble the pedestal:

Refer to Figures 4-19 and 4-20 forreference to the numbered parts in theprocedures below.

1. Remove the flinger (#21) located onthe pump end of the bearingpedestal (#3).

2. Using a snap ring plier, remove snapring (#4).

3. Open the jaws of the vice approxi-mately 2-1/4" for model P3 and 3"for model P15.

4. Place the pedestal, pump sidedown, on the jaws. Refer to Figure4-18.

Figure 4-18

Page 513

5. Using a plastic or wooden mallet,gently tap on the end of the shaftuntil it slides out of the frame. Bothbearings should come out with theshaft. Do not use a metal hammer,severe damage to the shaft willoccur.

6. Using the arbor press, remove thetwo (2) bearings from the shaft.Refer to Figure 4-21. If the innerrace is well supported during thisoperation, no damage will be doneto the bearings.

bearing is removed. Refer to Figure 4-22.

and outside diameter, refer to Chart1, should be used between the arborface plate and the lower bearing toinsure proper installation, and toprevent bearing damage. Thebearings must seat against theshoulder for proper alignment. Referto Figure 4-23.*Also refer to Alternate bearinginstallation procedures.

30 23

17

24

4213

33

24A

Figure 4-19 P3 Bearing Pedestal

4

P3 & P15 BEARING PEDESTAL

NAME/DESCRIPTION PART NO. QTY.Bearing Pedestal 3 1Snap Ring/Bearing Retainer 4 1Shaft 17 1Flinger 21 1Key Coupling 23 1Ball Bearing/Inboard 24 1Ball Bearing/Outboard 24A 1Coupling Guard/Halves 30 2Capscrew 33 4

Figure 4-21If an arbor press is not available, abench vise may be substituted usingthe following procedure.

1. Remove the pedestal and close thejaws to approximately 1-1/8" formodel P3 and 1-3/8" for model P15.

2. Place the shaft with either bearingresting on top of the jaws and gentlytap on the end of the shaft until the

Figure 4-223. Repeat step 2 to remove the other

bearing. Good support used on theinner races will prevent bearingdamage.

4C Inspection of Components

Thoroughly clean all parts. All compo-nents should be examined for wear andcorrosion. Replace any parts showingvisible wear.

Check to be certain that a press fit stillexists between the shaft and the bearings.New bearings, or at least cleaned andregreased bearings, are recommended.

Check the shaft for galling, pitting, andcorrosion. Surface corrosion on the pumpportion of the shaft must be removed sothe seals will slide freely during assembly.The shaft diameter should be no smallerthan .002" below the nominal fractionalseal sizes. Remove any nicks or burrswhich may have occurred during disas-sembly. Reclean parts as necessary.

4D Reassembly

All parts should be visually inspected andcleaned or replaced as outlined in 4Cabove. It is recommended that thebearings be replaced any time the bearingpedestal is disassembled for service.

1. Using an arbor press, install thebearings on the shaft prior to installingthe shaft into the pedestal. A steel“donut” with the proper inside diameter

P3 P30Inside Diameter 1"Outside Diameter 2"

Figure 4-23

CHART 1

Figure 4-24

30

23

17

24

33

24A

3

Figure 4-20 P15 Bearing Pedestal

2. Place the pedestal, pump mountingsurface up, in a vise or suitablefixture and insert the bearingassembly. It should be possible toinstall the shaft assembly with firmthumb pressure. Refer to Figure 4-24. If more force is required, thebutt end of a hammer handle orplastic mallet may be helpful. Theshaft assembly should never beforced or driven in.

Page 514

5. Wrong direction of rotation — Com-pare pump rotation with arrow onpump. Standard pumps rotate in aclockwise direction when looking at theshaft extension end or from the motorend on close coupled pumps. Reversetwo leads on a three phase motor tochange rotation. Check motornameplate for single phase operation.

6. Clogged suction line, strainer, or footvalve — Inspect and clean out ifnecessary.

7. Air pocket in suction line — Look forhigh spots in inlet piping system.Evacuate the system with a vacuumpump if necessary.

5B Reduced Capacity

1. Pump not up to speed — Use atachometer to determine actual RPM.Check voltage and wiring connections.

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

3. Insufficient NPSH — Relocate pump,supply tank, or both to improve NPSHavailable if possible. Increase suctionpressure. Reduce fluid temperature.Select a pump with lower NPSHrequirements.

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 is asuspicion of damage, remove thepump from service and disassemblefor inspection.

5. Air leak in the suction line — Fill thesystem with fluid and hydrostaticallytest. Tighten connections or replaceleaky components.

6. Air pockets in the suction piping —Operating the system at maximumflow conditions will usually clear thelines. Evacuate the system with avacuum pump if necessary.

7. Suction lines, strainer, or foot valvetoo small or clogged — Inspect andclean out as necessary. Fittings andlines should be at least equal to thepump suction size.

8. Discharge head too high — Install apressure 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 satisfactorily

FLEXIBLE COUPLED PUMPSCLOSE COUPLED PUMPSVERTICAL FLANGE MOUNTED 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 is filled withfluid.

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

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

5.T41 SERIES

Troubleshooting

3. Install the snap ring (#4) in the pumpend of the pedestal. Be sure thesnap ring is seated properly in thegroove. The beveled edge of thering should face away from thebearing.

4. Install the flinger over the snap ring.The bearing pedestal is now readyfor pump and motor installation.

*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 an emer-gency situation.

1. Stand a piece of 3/4" pipe for P3 ora 1-1/4" piece of pipe for P15, withthe threads cut off, on a workbenchor similar flat surface, with thebearing placed on the correct shaftend.

2. Insert the shaft into the pipe so thebearing is between the pipe and theshoulder of the shaft. Refer to Figure4-25.

assembly turns freely. Turn the shaftby hand. If it is tight or rough spotsare encountered, it is likely that atleast one of the bearings wasdamaged during disassembly/assembly operations, and will haveto be replaced.

2. Look to make sure that the lip sealson the bearings are positionedproperly in their grooves. Correct ifnecessary. As the bearings areturned, the grooves should appearwet with oil, but have no visiblegrease present.

3. Recheck the snap ring on the largebearing end. It should be firmly inplace, and no axial motion shouldresult from gentle tapping on eitherend of the shaft. (Use a soft malletso shaft surfaces are not damaged.)

4. No adjustments are possible orrequired. Proceed with the appropri-ate pump end assembly operations.Refer to Section 4 SERVICE -PUMP ENDS (Final testing is doneafter the pump end is in place.)

Figure 4-253. Using extreme caution, gently tap on

the end of the shaft until the bearingrests against the shoulder. Neverattempt to install the bearings bystriking the outer race.

4. Repeat steps 1-3 for the other bearing.

4E Testing and Final Adjustments

1. Check to be sure that the rotating

Page 515

and now gives evidence of reducedperformance, it should be disassem-bled and examined for wear after thesimpler possible problems havebeen investigated.

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. Checkthe seal on the inlet end of the pumpto determine if air is being drawn in.Hydrostatically test the system toinsure that there are no leaks.

3. Mechanical wear or damage —Rotate the pump by hand todetermine if there are tight spots.Broken or bent impeller vanes cansometimes be detected in thismanner. If there is a suspicion ofdamage or wear, remove the pumpfrom service and disassemble forinspection. Look for wear on theimpeller, suction cover, and motorbracket.

4. System head less than expected —Replace pump with higher capacityunit or add a valve or orifice toincrease line resistance.

5D Pump Loses Prime After Starting

1. Leak in suction line — Fill thesystem with fluid and hydrostaticallytest. Tighten connections or replaceleaky components.

2. Air entering pump through inlet sealor “O” rings — Hydrostatically testthe pump and look for leaks.Replace faulty seals or “O” rings.

3. Insufficient NPSH or too muchsuction lift — Relocate pump, supplytank, or both to improve inletconditions. Increase suctionpressure. Reduce fluid temperature.Select a pump with lower NPSHrequirements.

5E Excessive Power Consumption

1. Speed too high — Check RPM withtachometer.

2. Discharge head too high — Install apressure gauge at the disharge todetermine the actual operatingpressure. Compare readings withpump performance curve. Adifferent pump, motor, or both maybe necessary.

3. Specific gravity or viscosity too high —Check fluid involved. A different motormay be necessary.

4. Mechanical damage — Turn pumpover by hand. After a few days run-inperiod, all models should turn over byhand with no tight spots. An exceptionto this is when the pump has been idlefor some time. In this case, run thepump for a few hours before checkingfor tight spots. If there is a suspicionof damage, remove the pump fromservice and disassemble for inspec-tion.

5. Pump not fully “broken in” — It isnormal for new pumps to consumehigher than normal current during thebreak-in period. If high powerconsumption persists beyond a fewweeks, it is unlikely that furtheroperation will reduce consumption.

6. Pump not properly adjusted — Loosenall nuts on pump exactly one turn.Follow the instructions in Section 4FTesting and Final Adjustments, forrepositioning fasteners.

5F Pump Vibrates Or Is Noisy

1. Pump and motor are misaligned —Follow the instructions in Section 2DAlignment, for proper alignment.

2. Insecure mounting — Follow instruc-tions in Section 2, 2B Foundation.

3. Piping load on pump — Install pipingsupports and check to see that there isno strain on the pump.

4. Mechanical damage — If mechanicaldamage is suspected, check first todetermine if the pump turns freely.Disassemble for inspection if tightspots are found.

5. Pump has a high pitched whine — Thisis typical of a regenerative turbinepump. The intensity should increaseas pressure increases. Over a periodof a few weeks the noise level willdiminish and will be noticeably quieteras it approaches a “run-in” condition.

5G Mechanical Problems

1. Short bearing life — Bearings dam-aged due to leaky seals. Couplingmisalignment. Piping load on pump.RPM or pump pressure too high.

2. Pump locked up — Pump dried outand close clearance areas rusted.Follow installation instructions forloosening the pump. Foreign materialin pump. Flush out. Disassemble ifflushing is not successful.

3. Pump leaks — Seal or “O” rings areusually the problem. Disassemblyand replacement is the solution iftightening the thru bolts has noeffect.

5H Seal Leakage

1. Worn seat or rotating element —Seals will last many years operatingon cold clear water or other fluidswith reasonable lubricity. Particles,even microscopic, increase normalwear rates. 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 rotatingelement — If a seal has recentlybeen replaced, look for a missing “O”ring/cup around the seat, or a seatthat was installed cocked or back-wards. The smooth surface shouldface the rotating element. Therotating element may be in backwardor improperly positioned. Refer tothe appropriate seal diagrams andinstructions to confirm the correctseal orientation. Rotating elementssometimes stick in the wrongposition if left partially assembled forsome time. Make sure a rotatingelement can be moved axially on theshaft before closing up the pump,and then make the final adjustmentsas soon as possible.

3. Seat broken during assembly —Ceramic seats are particularlyvulnerable to damage. Carefullyfollow reassembly instructions forseals. Seals on flex-coupled unitscan be damaged by excessivehammering when installing thecoupling onto the shaft 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 normal use.This is normally not a problem for thefirst seal assembly since theelastomer is conforming as thisaction occurs. A new seal can leakbefore it conforms if the pits arelarge enough. If any pits are visibleto the unaided eye, shaft or sleevereplacement is advised.

T41 SERIES

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

URL: MTHPUMPS.COMEmail: SALES@MTHPUMPS.COM

Section T41 Page 516Dated January 2000

97-4622-01-588

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 productsproved to be defective after examination

by the Company. The defective Productmust be returned, transportation prepaid, tothe factory at Plano, Illinois. Disassembly ofthe equipment impairs determination ofreasons 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 Warrantyshall not apply to any Product or parts ofProducts which: (a) have been repaired or

7.Limited Warrantyaltered 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 unenforceableunder the applicable State law. SomeStates do not allow the exclusion orlimitation of incidental or consequen-tial damages, so the above limitationor exclusion may not apply to you.This warranty gives you specific legalrights, and you may also have otherrights which vary from State to State.

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

and Accessories

6A Parts

Repair parts may be obtained throughyour local Authorized MTH PumpsRepresentative or Distributor who canbe found in the yellow pages or bycontacting MTH Pumps at 401 W. MainSt. • Plano, IL 60545 Phone: 630-552-4115Fax: 630-552-3688.

6B Repair Services

Repair service for an MTH pumpshould be obtained from the companythrough which it was purchased.

6.In the event this is not possible, the nameand phone number of a nearby MTHrepresentative or distributor may beobtained by contacting MTH Pumps. Inthe event that it is necessary to return thepump to the factory for repairs, remove allaccessories attached to the pump. Wecannot accept responsibility for their saferemoval, storage, and return.

6C Warranty Service

All requests for warranty claims should bemade through the company from whichthe pump was purchased or supplied.Complete details on what is wrong withthe pump must be provided along withinformation on the system in which it isinstalled. Refer to the MTH PumpsLimited Warranty statement. Returnauthorization must be obtained prior toreturning any equipment.

6D Motors, Mechanical Seals, andAccessories

Repair or replacement service onmotors, mechanical seals, relief valves,or other accessories should be obtainedfrom the manufacturer of thesecomponents. MTH does not carryreplacement parts and is not authorizedto render repair service on thesecomponents. Replacement mechanicalseals are stocked at MTH and arealways available insofar as possible forimmediate shipment. Warranty service,as well as expert application informa-tion can be obtained from your localseal manufacturer's sales office.

Parts and Repair Services

T41 SERIES