Operating and Maintenance Manual U.S. Postal Service PTU-4...

Operating and Maintenance Manual

U.S. Postal ServicePTU-4 Series E-Z Reach

4000 Lb. Capacity Portable Container Tilter

Southworth Products CorpP.O. Box 1380 • Portland, ME 04104-1380

Telephone: 207-878-0700 Fax: 207-797-4734

November 2008

Model #: PTU-4

Serial # _________________________________________

Placed in Service _________________________________

OPERATING AND MAINTENANCE MANUAL

2 USPS PTU-4 Owner’s Manual

Southworth Products Corp is widely acknowledged as the leading maker ofhydraulic lifts and materials-handling equipment. Southworth machines are ruggedand reliable, and are designed to provide years of trouble-free service. The designsare based on extensive engineering experience. These are good reasons forspecifying Southworth machines in your plant.

SOUTHWORTH

USPS PTU-4 Owner’s Manual 3

ContentsINTRODUCTION ............................................................................. Page 4SAFETY ................................................................................................... 4INSTALLATION INSTRUCTIONS ............................................................. 5

Preparation ................................................................................... 5Testing .......................................................................................... 5

OPERATING INSTRUCTIONS ................................................................. 6Safety labels ................................................................................. 7Safety instructions ........................................................................ 8Loading the unit ............................................................................ 8Raising the tilt platform ................................................................. 9Moving the unit ............................................................................ 10Lowering the tilt platform ............................................................ 10Charging the unit ........................................................................ 10Precautions for grounding and AC power cord connection .........10

MAINTENANCE ...................................................................................... 11Hazards ...................................................................................... 11Routine periodic maintenance .................................................... 11Hydraulic fluid specifications ...................................................... 12Changing the hydraulic fluid ....................................................... 12Repacking the cylinder ............................................................... 12

TROUBLESHOOTING ........................................................................... 13ORDERING REPLACEMENT PARTS ....................................................16

Recommended Spares ...............................................................16Warranty ..................................................................................... 20

List of FiguresFig. 1 Labels and Precautionary Markings ........................................ 6Fig. 2 Pinch Points ............................................................................ 7Fig. 3a Push the unit completely up to the load .................................. 8Fig. 3b Place the container up against the tilt platform ........................ 8Fig. 4 Correct load center ................................................................. 9Fig. 5 Center the load ....................................................................... 9Fig. 6 Don’t overfill the container ....................................................... 9Fig. 7 Cylinder diagram ................................................................... 13Fig. 8 Hydraulic/electric diagram .................................................... 14Fig. 9 Hydraulic power unit ............................................................. 17Fig. 10 Hand control ......................................................................... 17Fig. 13 Battery schematic ................................................................. 18



IntroductionThe Southworth PTU-4 Series “EZ-Reach” Por-table Tilter allows staged containers to be pickedup, moved into position, and tilted for easy access.Southworth has produced the units described inthis manual for the use of the U.S. Postal Service.

The PTU-4 units have a maximum capacity of4,000 lbs. These are DC-powered units, and havean on-board battery (12V unit). Once the batteryhas been charged, the unit can be operated with-out a connection to an outlet. When the batteryrequires recharging, the 12V unit must be con-nected to a battery charger.

This manual contains instructions on the safe andproper installation, use, and maintenance of aPTU-4 Series EZ-Reach unit. Be sure that thismanual is available to the people who install, use,or service the unit. Be sure that all personnel read

this manual before they install, use, or servicethe unit.

The instructions in this manual are not necessar-ily all-inclusive, as Southworth cannot anticipateall conceivable or unique situations. In the in-terest of safety, please read this whole manualcarefully. Please understand the material inthis manual before you install, use, or servicethe E-Z Reach unit. If you have any questionsabout any of the instructions in this manual,please contact Southworth Products Corpo-ration.Southworth’s product warranty is shown on therear cover of this manual. This instruction manualis not intended to be or to create any otherwarranty, express or implied, including anyimplied warranty of merchantability or fitnessfor a particular purpose, all of which arehereby expressly excluded. As set forth more

SafetyThe safety of all persons installing, using, servicing, or working near the EZ-Reachunit is of paramount concern to Southworth. The EZ-Reach unit is a powerfulmachine with moving parts, and is capable of causing personal injury if properprecautions are not taken.Therefore, throughout this manual, Southworth has identified certain hazards whichmay occur in the use of the EZ-Reach unit, and provided appropriate instructionsor precautions which should be taken to avoid these hazards. In some cases,Southworth has also pointed out the consequences which may occur ifSouthworth’s instructions or precautions are not followed. Southworth uses thefollowing system of identifying the severity of the hazards associated with its prod-ucts:

DANGER – Immediate hazard which will result in severe personal injury or death.WARNING – Hazard or unsafe practice which could result in severe personal in-jury or death.

CAUTION – Hazard or unsafe practice which could result in minor personal injuryor property damage.

Please read and follow this instruction manual, including all safety instruc-tions and precautions, carefully and completely.

SOUTHWORTH


Installation InstructionsPreparation1. Before you start to use the unit, check for lo-cal codes and ordinances which may apply. It isyour responsibility to obtain any necessary per-mits.

2. Read all of these installation instructions care-fully. Be sure to read and understand all of thewarnings.

3. The unit should only be used indoors, or itshould be protected from the weather.

WARNING!• Protect the unit from rain or mois-ture. If the electrical parts in the powerunit get wet, workers may be hurt byelectrical shock. The electrical partsmay fail if they are wet.• This unit has an electric motorwhich can create sparks. Don’t usethe unit in an area where flammablegases may be present.

4. Remove the shipping material and removethe unit from the skid. You will need a crane orlift truck which can lift the unit safely.

CAUTION!Do not try to move the lift by support-ing the tilt platform. One end of thetilt platform is free.

5. On the front of this manual, write down themodel number, serial number, and date the unitis placed in service.

6. Before using the unit, plug it in and allow thebattery to charge overnight.

7. Check the level of the hydraulic fluid in thetank. In order to check the level, lower the tilt plat-form completely and unplug the power cord. Re-move the rear cover on the unit. Open the fillercap on the side of the power unit. The fluid shouldreach the elbow in the filler pipe. Do not fill to thetop of the filler pipe – there should always be anair space at the top of the tank.

8. Be sure the tank vent is not plugged. Beforeoperating the unit, you must remove the solid plugfrom the top of the tank and insert the red plasticvented plug. Also check to be sure the vent lineis clear.

Testing1. Be sure the battery is charged. (See page 11.)Clear the area around the unit, and warn others to stayaway from the unit.2. Operate the unit through its full range of travel.The unit should rise smoothly with a quiet hummingsound, and lower smoothly and quietly. Raise andlower the unit a few times to check the lifting action.

WARNING!As the tilt platform moves up and down,“pinch points” are created at the placesshown in Fig. 2. If you are standing tooclose to the unit when it is moving, yourarm or leg may be caught in the movingparts, and you may be hurt. Stay away fromthe pinch points when the unit is moving.

3. Test the unit with the rated load. If the unit doesnot rise, and you hear a loud squealing noise, the pres-sure relief valve is operating. Contact Southworth forinstructions.

WARNING!Don’t continue to use the unit if this hap-pens – the pump will overheat veryquickly, and may be permanently dam-aged. Do not try to adjust the relief valve.If you change the setting on the reliefvalve, you may overwork the unit. This cancause the unit to fail suddenly, and youmay be hurt.

4. Clean up any spilled hydraulic fluid. Spilled hydrau-lic oil is slippery, and may present a fire hazard. If youclean up any spilled fluid, you will be able to tell rightaway if the unit begins to leak.5. Figure 1a and Fig. 1b show the safety labels onthis unit. Check to be sure all of the labels are in place.

specifically in the product warranty, Southworth’sobligation under that warranty is limited to therepair or replacement of defective components,which shall be the buyer’s sole remedy, andSouthworth shall not be liable for any loss, injury,or damage to persons or property, nor for any di-rect, indirect, or consequential damage of any kindresulting from the EZ-Reach Portable Tilter unit.



Fig. 1 Labels and Precautionary Markings

SOUTHWORTH


Operating InstructionsSafety Instructions

WARNING!• To avoid bodily injury, please read all instructions before operat-ing or servicing the unit.• Do not work under the tilt platform when it is raised. Before ser-vicing the unit, always lower the unit and unplug the power cord.Remember that the battery is still connected, and can still providepower to the unit.• Never put your hands or feet under the tilt platform.• As the unit is operating, stay away from the moving parts shown inFig. 2.• Do not stand, sit or ride on the tilt platform.• Before raising or lowering the tilt platform, always set the floorlock so the unit cannot roll out of position.

Fig. 2 Pinch points



Loading the unit1. Before operating the unit, please readand understand all of this section.

2. Load the unit correctly.

Before lifting, push the lifting arms of theunit completely under the load so that nospace is left between the load and the tiltingplatform, as shown in Fig. 3a. If you do notdo this, the container may slide down andcreate dangerous “pinch points.”

Be sure that the load weighs no more thanthe maximum rated for the unit. The maxi-mum rated load is listed on the data plate.Remember that the lifting container mayweigh 75 lbs. or more.

WARNING!The tilt platform should always bepushed against the load. If theload is placed far out on the liftingarms, the unit may not be able tolift the full rated load safely. SeeFig. 4. (The unit is designed sothat the center of load should be17" from the bottom of the tilt plat-form, and 20" from the face of theplatform.)

WARNING!Don’t try to lift a load that exceedsthe maximum rating. Only lift a loadif the center of load is within the al-lowable range. If you do not followthese rules, the unit may fail sud-denly. Someone may be hurt, and theunit and load may be damaged.

3. The load should be balanced in the side-to-side direction. Whenever possible, place theload in the center of the tilting platform, asshown in Fig. 5. If the load is off-center on thepallet, place the heaviest part of the load nearthe back of the tilt platform – never near thefront!

4. Sometimes the unit may be used to lift partswhich can roll. If possible, stack the parts inthe parts container so they cannot roll. Do notover-fill the lifting container. See Fig. 6. If thecontainer is too full, some of the parts may rollout of the front of the container.

Fig. 3a Push the Unit Completely Up to the Load

Fig. 3b Before lifting make sure the container ispushed up against the tilt platform.

J120

J121

SOUTHWORTH


Raising the Tilt Platform1. Before raising the tilt platform, be sure all work-ers are clear of the unit.

WARNING!As the tilt platform moves up anddown, “pinch points” are created asshown in Fig. 2. Stay away from thesepinch points! Part of your body orclothing may become caught, and youmay be hurt. Do not put your hands orfeet under the tilt platform. Do notstand or sit on the tilt platform.

2. Before lifting, set the floor lock. This will keep

the unit in position so that it cannot move acciden-tally.

3. Before lifting, be sure the parts container ispushed up against the tilt platform, as shown inFig. 3b. Be sure the load is balanced side-to-side,as shown in Fig. 5.4. Operate the unit. Press and hold the Up but-ton to raise the tilt platform, and Down to lower it.If the unit does not operate right away, call a quali-fied maintenance worker.

WARNING!If you hear a squealing noise from thepump, the pressure relief valve is op-erating. Don't continue to use the unit!The pump will overheat very quickly,and may be permanently damaged.The relief valve is included to protectthe machine operators. Do not changethe setting on the relief valve. If youdo change the setting, this may causea hydraulic part to fail. The tilt plat-form may drop suddenly. Someonemay be hurt, and the unit and load maybe damaged. The hydraulic parts inthe unit are designed to handle a cer-

Fig. 4 Correct Load Center

Fig. 5 Center the Load Fig. 6 Don’t Over-Fill the Container

J119J133



tain amount of pressure. The reliefvalve has been included for the protec-tion of all of the workers who use theunit.

Moving the Unit1. Before moving the unit, always lower the tiltplatform to the lowest possible level. You shoulddo this even if the unit is not loaded.

WARNING!If you try to move the unit while the tiltplatform is raised more than a fewinches, the unit may be unstable. Youmay be hurt, and the lift or load maybe damaged.

2. Before moving, release the floor lock.

3. Always roll the unit across a stable, solid sur-face.

WARNING!If the floor is not stable or solid, theunit may tilt over. You may be hurt,and the unit or load may be damaged.

Lowering the Tilt Platform1. Before lowering the tilt platform, be sure thefloor lock is set. This will keep the unit from mov-ing accidentally.

PRECAUTIONS FOR GROUNDINGAND AC POWER CORD CONNECTION

Charger should be grounded to reduce risk of electric shock. Charger isequipped with an 115V electric cord having an equipment-grounding conduc-tor and grounding plug. The plug must be plugged into an outlet that is prop-erly installed and grounded in accordance with all local codes and ordinances.

DANGERNever alter the AC cord or plug provided. If it will not fit outlet, have properoutlet installed by a qualified electician. Improper connection can result in arisk of an electric shock.

2. Before lowering the tilt platform, be sure allworkers are clear of the unit.

WARNING!As the tilt platform moves up anddown, “pinch points” are created asshown in Fig. 2. Stay away from thesepinch points! Part of your body orclothing may become caught, and youmay be hurt.

3. Press the Down button to lower the tilt plat-form. The tilt platform should lower at a uniformspeed.

Charging the Unit1. The battery power system is designed for in-termittent duty. The unit is not designed to oper-ate continuously. If fully-charged, the batteryshould operate the unit for about 30 lift cycles percharge. The battery should require about 4 hoursminimum to recharge completely.2. To begin charging, plug in the 115V power cordfor the battery charger. A red light on the chargerindicates charging. A green light will light up whenfully charged.

SOUTHWORTH


MaintenanceAll servicing should be done by qualified personnel.Qualified personnel should be able to read and un-derstand wiring and hydraulic diagrams. They shouldbe able to troubleshoot live electrical circuits safelyand in accordance with accepted practice. Forsafety's sake, if in doubt, please contact your dealeror Southworth Products Corporation Customer Ser-vice Department at (207) 878-0700.Before servicing the unit, please read and under-stand all of this section and the section entitled“Operating Instructions.”

HazardsThere are several hazards you should be awareof as you service the unit:

WARNINGS!• As the unit moves up and down,“pinch points” are formed as shownin Fig. 2. Keep hands, feet, and looseclothing away from these pinch points.If your hand or arm or a part of yourclothing is caught, you may be hurt.• Before performing any maintenanceon the unit, lower the tilt platform com-pletely. Failure to do so could resultin severe personal injury.• The relief valve has been included forthe protection of all of the workers whouse the unit. Don't change the relief set-ting! If the relief valve does not openwhen it should, the unit may fail. Some-one may be hurt, and the unit and loadmay be damaged.• If the hydraulic fluid is released un-der high pressure, it can cause per-sonal injury. Before you open any partof the hydraulic system, be sure to re-lease the hydraulic pressure. You cando this by lowering the tilt platform allthe way down.• The warning labels have been in-cluded for the safety of the operator.If the labels are worn or missing, or

have been painted over, replace thembefore releasing the lift for operation.Fig. 1 shows the safety markings onthis unit.

Routine Periodic MaintenanceEvery month:• Visually inspect the pins and bushings on thecylinder for signs of wear. Also check the pivotpins at both sides of the tilt platform. If any ofthese parts are worn, contact Southworth for re-pair instructions.

• Apply light oil or WD-40 to the parts listed inthe last step.

Note – Although the bushings are “lifetime lu-bricated” Teflon® bushings, their performance maybe extended by additional periodic lubrication.

• Check the hydraulic oil level. In order to checkthe level, lower the tilt platform completely andunplug the power cord. Remove the rear coveron the unit. Open the filler cap on the side of thepower unit. The fluid should reach the elbow in thefiller pipe. Do not fill to the top of the filler pipe -there should always be an air space at the top of thetank.

CAUTION!It is important to use hydraulic fluidwith the correct grade and properties.See the hydraulic oil specification inthis section of this manual.

Every six months or 500 hours ofoperation, whichever comes first:• Check all of the hydraulic fittings and hoses,and tighten the connections if necessary. Some-times the fittings can be worked loose by the vi-brations from the power unit.

WARNING!If a hydraulic fitting becomes loose, orif a hydraulic hose breaks, the hydrau-lic fluid may escape from the systemunder pressure. If the tilt platform is



raised when this happens, it can dropquickly. Someone may be hurt, or theunit or load may be damaged. To avoidthis problem, inspect all of the hydrau-lic hoses and fittings regularly, and re-place them if they are worn or damaged.

• The clear plastic vent line and the cylinder rodshould be free of hydraulic fluid. If you find muchfluid in either place, the cylinder seals may be leak-ing. (It is also possible the tank may be over-filled.) If the worn parts must be replaced, seethe section on “Repacking the Cylinder.”• Disassemble the down valve. Blow the valveplunger clean with compressed air. Reassemblethe valve and reinstall it.

• Drain and discard the hydraulic fluid. The suc-tion filter is in the tank, at the point where the suc-tion line runs out to the pump. Unscrew the hy-draulic line, then remove the filter. Blow the filterclean with compressed air. Reinstall the filter inthe tank and reassemble the hydraulic line.

• Refill the tank with new hydraulic fluid.

CAUTION!If you continue to use fluid after it has“worn out,” the moving parts in thesystem will wear more quickly.

Hydraulic Fluid SpecificationsIf the EZ-Reach unit will be used at normal ambi-ent temperatures, Southworth supplies the lift withDextron 3 ATF. This may be replaced by any othergood-quality oil with 150 SSU at 100° F and rustand oxidation inhibitors and anti-wear properties.

If the EZ-Reach unit will be used at ambient tem-peratures below 0° F, use aircraft hydraulic oil.

Use Texaco type BB or an equivalent.

CAUTION!It is very important to keep the hydrau-lic oil free of dirt, dust, metal chips,water, and other contamination. Mostproblems with hydraulic systems arecaused by contamination in the oil.

Changing the Hydraulic FluidIn order to change the fluid, lower the tilt platformcompletely and remove the rear cover on the unit.

To change the fluid, you must remove the powerunit from the machine. Disconnect the electricalwiring, the hydraulic hose, and the vent line. Oncethe power unit has been removed, you can re-move the filler cap and pour out the old fluid. Fillwith fresh fluid up to the elbow in the filler pipe.Do not fill to the top of the filler pipe – there shouldalways be an air space at the top of the tank.

CAUTION!As you disconnect the hydraulic lines,be sure to keep them free of dirt or con-tamination.

Repacking the Cylinder1. Remove the cylinder from the machine. Cleanthe outside of the cylinder. Push the piston into thecylinder as far as possible. Drain the oil from thecylinder. Clear an area near the cylinder so that youcan lay out the parts as you remove them.

2. Secure the cylinder in a vise, or use anothermethod to keep it from rotating.

3. Using snap ring pliers or a screwdriver, removethe snap ring from the gland of the cylinder. Pull therod out to within 3 to 6 inches of full extension. Com-press the ring and, at the same time, pull the rodand drive the gland out of the cylinder.

4. Carefully remove the rod assembly from thecylinder and remove the gland. Slip the gland overthe end of the rod. Be careful not to damage thefinish on the rod.

5. Carefully examine the seals on the piston and

The following are equivalent to Dextron 3 ATF:TYPE MANUFACTURER

D.T.E. 24 MOBIL OIL CO.

NUTO H32 EXXON CO.

AMOCO AW32 AMOCO CO.

Citgo AW32 CITGO OIL CO.

SOUTHWORTH


gland. Remember the positions of these parts sothat you can place the replacement parts correctly.Notice that the lip on the rod wiper faces upward.Remove all seals from the piston and gland.

6. Inspect the parts for damage - nicks,scratches, cracks, etc.

7. Install new seals on the piston and gland. Besure that all parts are free of dirt or contamina-tion. Install the snap ring on the gland.

8. Coat the inside diameter of the gland with lightgrease and replace it on the rod.

9. Coat the outside diameter of the piston andseal area on the gland with light grease. Apply alight coat of hydraulic oil to the inside diameter ofthe cylinder. Insert the rod assembly into the cyl-inder. Be careful not to damage the threads, rod,or seals.

10. Rotate the gland so that the port for the hy-draulic oil lines up with the hole in the side of thecylinder. Compress the snap ring and lightly tapthe gland into place. Relax the snap ring. Besure that the snap ring is seated in the groove.If the snap ring is not seated, the gland may popout of the end of the cylinder under pressure.

11. Install the cylinder in the machine and test it.Operate the cylinder through several complete

cycles to work out any air bubbles in the hydraulicfluid.

TroubleshootingAll servicing should be done by qualified person-nel. Qualified personnel should be able to readand understand wiring and hydraulic diagrams.They should be able to troubleshoot live electri-cal circuits safely and in accordance with acceptedpractice. For safety's sake, if in doubt, pleasecontact Southworth Products Corporation at (207)878-0700.

Before servicing the unit, read and understand thisentire section and the section entitled “OperatingInstructions.”

WARNING!Before performing any maintenanceon this unit, lower the tilt platform com-pletely.

o If the tilt platform will not raise:CAUTION!

If the platform will not raise, do notcontinue to hold the Up button formore than 2 or 3 seconds. You maydamage the pump.

1. The battery may need charging. Plug in theunit, and allow the battery to charge overnight.

2. The load may be too heavy. Check the actualweight of the load. The rated capacity of the unitis shown on the name plate. Be sure the centerof the load is within allowable limits. See Fig. 4.

WARNING!Don't change the setting of the reliefvalve. If you do change the setting,this may cause a hydraulic part to fail.The tilt platform may drop suddenly.Someone may be hurt, and the unit andload may be damaged. The hydraulicparts in the lift are designed to handlea certain amount of pressure. The re-lief valve is set to relieve this pressurebefore it becomes too great. The re-lief valve has been included for the

Fig. 7Cylinder Diagram



protection of all of the workers whouse the unit.

3. The hydraulic oil level may be low. In order tocheck the level, lower the tilt platform completelyand unplug the power cord. Remove the rearcover on the unit. Open the filler cap on the sideof the power unit. The fluid should reach the el-bow in the filler pipe. Do not fill to the top of thefiller pipe – there should always be an air spaceat the top of the tank.

4. The correct voltage may not be reaching the mo-tor. In order for the motor to receive power, the motorstarter relay must be energized. When you pressthe Up button, 12V should appear at the smallcenter terminal of the relay. (If you do not seethis voltage, check for a problem with the Up but-ton switch.)

As soon as there is 12V at the center termi-nal, you should also see 12V at the larger termi-nal on the left side of the relay. This is the outputfrom the relay to the motor. (If you do not see this

output voltage, the motor starter relay may be bad.)

5. The tank vent may be plugged. Before oper-ating the unit, you must remove the solid plug fromthe top of the tank and insert the red plastic ventedplug. The vent line must be clear.

6. The suction filter may be clogged. Clean thesuction filter as described in the section on “Peri-odic Maintenance.”

7. A vacuum leak may be allowing air into thesuction line, causing cavitation (loss of suction) inthe pump. Check all fittings in the suction line,and tighten or replace them if necessary.

CAUTION!If cavitation is allowed to continue, thepump may be damaged, and may haveto be replaced.

8. For the tilt platform to raise, the down valvemust be de-energized and closed completely.Check for a problem with the wiring to the down

Fig. 8 Hydraulic/Electrical Diagram

SOUTHWORTH


valve. Check the solenoid in the valve with a volt-meter. The valve must be clean and free to oper-ate. To check this, remove the solenoid and thenthe valve. Look for dirt or metal chips which couldblock the valve action. Clean the valve plungerwith kerosene, then blow it clean with compressedair. The expansion nut which holds the solenoidshould be finger tight only!

o If the unit elevates, but fails to hold a load:1. The check valve may be leaking. Dirt on thevalve seat can prevent the valve from closing fully.

The check valve is located in the pump assem-bly, near the center of the power unit. Removethe check valve cap and inspect the valve for dirtor metal chips which may be preventing it fromclosing. You may be able to restore the seal bylightly rapping the ball into the seat using a 1/4"diameter rod and a small hammer.

2. The down valve may be energized. While theunit is holding a load, the down valve should be de-energized and fully closed. Check the solenoid inthe valve with a voltmeter. The valve must be cleanand free to operate.

Be very careful not to remove the down valvewhile the hydraulic system is pressurized. It canbe dangerous to release the pressure suddenly.

Set the floor lock and lower the tilt platform ontoblocks, so it cannot possibly move. Next, jack upthe tilt platform slightly above its stopping point. Thiswill de--pressurize the hydraulic system. Now it issafe to remove the down valve.

Remove the solenoid and then the valve. Lookfor dirt or metal chips which could block the valveaction. Clean the valve plunger with kerosene,then blow it clean with compressed air. The ex-pansion nut which holds the solenoid should befinger tight only!

3. The cylinder may be leaking. Look for oil onthe cylinder rod and in the vent line. (This mayalso occur if the oil tank has been over-filled.) Ifyou find much oil in either place, and the tank isnot over-filled, the cylinder must be repacked. Turnto the section on “Repacking the Cylinder.”

o If the unit fails to lower:1. The down valve should be energized and fullyopen. Check the solenoid on the valve with a volt-meter.

2. The valve must be clean and free to operate.In order to check the down valve when the tilt plat-form is raised, you must take some special pre-cautions. Be very careful not to remove the downvalve while the hydraulic system is pressurized.It can be dangerous to release the pressure sud-denly.

3. Set the floor lock and block the tilt platform, soit cannot possibly move. Next, jack up the tilt plat-form slightly above its stopping point. This willdepressurize the hydraulic system. Now it is safeto remove the down valve.

4. Remove the solenoid, then the down valve.Look for dirt or metal chips which could block thevalve action. Clean the valve plunger with kero-sene, then blow it clean with compressed air.Before reassembly, depress the plunger manu-ally several times to be sure it moves freely. Theexpansion nut which holds the solenoid shouldbe finger tight only!

5. Once the unit is reassembled, press the Upbutton to take the weight of the tilt platform off ofthe blocks.

If the steps listed above do not solve the problem,please call the Southworth Products Corp Cus-tomer Service Department at (207) 878-0700.



Ordering Replacement PartsSouthworth has carefully chosen the components in your unit to be the best available for thepurpose. Replacement parts should be identical to the original equipment. Southworth willnot be responsible for equipment failures resulting from the use of incorrect replacementparts or from unauthorized modifications to the machine.

Southworth can supply all replacement parts for your Southworth lift. With your order, pleaseinclude the model number and the serial number of the unit. You will find these numbers onthe name plate.

To order replacement parts, please call the Parts Department at (207) 878-0700. Parts areshipped subject to the following terms:

• FOB factory.

• Returns only with the approval of our parts department.

• Payment net 30 days (except parts covered by warranty).

• Freight collect (except parts covered by warranty).

Parts replaced under warranty are on a “charge-credit” basis. We will invoice you when weship the replacement part, then credit you when you return the assumed substandard part.

Parts DepartmentSouthworth Products Corp

P.O. Box 1380Portland, ME 04104-1380Telephone: (207) 878-0700

FAX: (207) [email protected]

Recommended Spares

Item No. Description OEM Part No. Quantity

2989419 Flow Control .......................... Logic ................................... 1

6521262 Cylinder Packing Kit .............. Waltco ................................. 1

3041942P Power Unit 12VDC ................. John S. Barnes .................... 1

1004-021A Front Wheel .......................... Q Wheels ............................ 2

10027653 Rear Wheel ........................... Albion .................................. 2

2997783P Floor Lock ............................. Albion .................................. 1

60016243 Cylinder Assembly ................. Waltco ................................. 1

C141E Battery ................................. AGM/SLA .............................1

10008855 Battery Charger ..................... Guest ...................................1

SOUTHWORTH


Fig. 9Hydraulic Power Unit

Fig. 10Hand Control

Southworth part no. 3003856

Southworth part no. C-3041942P



Fig. 13Battery schematic

SOUTHWORTH


WarrantySouthworth Products Corp warrants its products to be free from defects in material

or workmanship for a period of two (2) years from date of shipment, providing claim ismade in writing within that time period. The structural assemblies (bases, legs, platforms)are covered under the parts provision of this warranty for an additional three (3) years anda lifetime warranty on the hydraulic cylinder rod bearings and seals.

This warranty shall not cover failure or defective operation caused by misuse, mis-application, negligence or accident, exceeding recommended capacities, failure to performrequired maintenance or altering or repairing, unless alteration is authorized by South-worth Products Corp. Except as set forth herein and including the warranties of merchant-ability and fitness for the USPS application, there are no other warranties, express or im-plied.

Southworth Products Corp makes no warranty or representation with respect to thecompliance of any product with state or local safety or product standard codes not men-tioned in the Contract No: 1CIEQU-04-Q-1541, and any failure to comply with such codes shallnot be considered a defect of material or workmanship under this warranty. Southworth Prod-ucts Corp shall not be liable for any direct or consequential damages arising out of such noncom-pliance.

Southworth Products Corp’s obligation under this warranty is limited to the replace-ment or repair of defective components at its factory or another location at SouthworthProducts Corp’s discretion. This is the buyer’s sole remedy. Except as stated herein, South-worth Products Corp will not be liable for any loss, injury or damage to persons or property,nor for direct, indirect, or consequential damage of any kind, resulting from failure or defec-tive operation of said product.

This warranty may be altered only in writing by Southworth Products Corp, Portland, ME.

Southworth Products Corp is widely acknowledged as the leading maker of hydraulic lifts, tilters and other materialshandling equipment. Southworth machines are rugged and reliable, and are designed to provide years of trouble-free

service. The designs are based on extensive engineering experience.These are good reasons for specifying Southworth machines in your plant.

SOUTHWORTH PRODUCTS CORPP.O. Box 1380, Portland, ME 04104-1380Telephone: 800-743-1000 • 207-878-0700

Fax: 207-797-4734http://blue.usps.gov/purchase/material/pmsc/greensboro

Southworth is the world class supplier of products designed to improve productivity and enhance safety. Our staff has over 400 years of engineering experience. If one of our

standard products does not meet your needs, we can design custom equipment specifically suited to your material handling application.

Spring Loader Lift with Turntable Portable Tilters Dock Lifts Palletizing Portable Lifts Stretchwrapping Positioning

Lift & Tilts Floor to Mezzanine Lifts

For more information, contact Southworth Products Telephone 800-743-1000 - Fax 207-797-4734

Email: [email protected]

Operating and Maintenance Manual U.S. Postal Service PTU-4...

Documents

Transcript of Operating and Maintenance Manual U.S. Postal Service PTU-4...