Hyster-Yale Electric Pallet Truck MPW050-EN24T2248

WARNING: Put blocks under both forks and on both sides of the drive tire. The blocks must prevent the lift truck from falling and causing personal injury or property damage.

NOTE: The caster wheel does not have to be removed from the lift truck frame to replace the wheel or the wheel axle.

Raise the drive wheel off the floor. Block the lift truck. See How to Put a Lift Truck on Blocks.

Remove the lock nut retaining the wheel on the wheel axle. Drive the wheel axle out of the arms and remove the wheel.

Align the wheel between both arms and install the wheel axle. Install the nut on the wheel axle. Tighten the nuts to 34 to 47 N•m (25 to 35 lbf ft).

Remove the blocks from under the lift truck and lower the truck to the floor. Test the operation of the truck prior to returning the truck to service.

Sign off on the caster wheels replacement

1. Turn the key switch to the OFF position and disconnect battery.

2. Remove the upper drive unit compartment cover.

3. Discharge the capacitor. See Special Precautions in this section.

4. Disconnect the wire harness plug from the back of the display. Locking tab is hidden underneath rubber boot.

5. Remove nuts and washers holding retaining bracket. Remove bracket and gauge from control panel.

1. Install gauge in control panel.

2. Install retaining bracket, washers, and nuts. Tighten nuts.

NOTE: On some models, the dash indicator will display the code: EP 107 (or a higher number) for 1 to 2 seconds every time the key switch is turned to the ON position. This code represents the EEPROM software version and DOES NOT INDICATE A FAULT CODE.

NOTE: These checks require a volt-ohmmeter. Specific checks require additional equipment.

NOTE: The correct meter polarity is necessary for the checks. The voltage checks are made between the individual points and battery negative. Connect the meter negative to battery negative.

Block lift truck so the drive wheels are off the floor. See the section Periodic Maintenance 8000YRM1048, Periodic Maintenance 8000YRM1009, or Periodic Maintenance 8000YRM1379 lift trucks. Refer to How to Put a Lift Truck on Blocks.

Turn the key switch to the OFF position.

Disconnect and separate the battery connectors.

Remove the upper drive unit compartment cover.

Remove the lower drive unit compartment cover.

Discharge the capacitor. See Special Precautions.

WARNING: Batteries are heavy and can cause personal injury. Use care to avoid injury. DO NOT put hands, arms, feet, and/or legs between the battery and a solid object.

WARNING: Make sure the capacity of the crane and spreader bar is greater than the weight of the battery. The weight of the battery is normally shown on the battery case. The maximum battery weight is shown on the lift truck nameplate. The spreader bar must NOT be made of metal or it must have insulated straps.

WARNING: Put blocks under each side of the truck under the drive unit frame. Position blocks on both sides of the load wheels. The blocks must prevent the lift truck from falling and causing personal injury or property damage.

WARNING: The capacitor in the transistor controller can hold an electrical charge after the battery is disconnected. To prevent electrical shock and personal injury, discharge the capacitor before inspecting or repairing any component in the drive unit compartment. Wear safety glasses. Make certain the battery has been disconnected. Refer to the section Steering Mechanism 1600 YRM 1004.

CAUTION: Make certain the hydraulic cylinder is fully collapsed.

Remove the drive unit compartment cover.

Disconnect the battery. Use a spreader bar and lifting device to remove the battery. DO NOT allow the battery move from side to side. Make sure the battery cables have clearance.

Raise the drive wheel off the floor and put blocks under both sides of the drive unit frame.

Drain the hydraulic oil from the hydraulic unit into an appropriate container.

1. Remove the traction motor and brake assembly from the MDU. See Brakes 1800YRM1005.

CAUTION: The pinion end cover and the armature are heavy components. Work carefully so the field coils, pole pieces, and armature are not damaged during disassembly and assembly.

2. Clean outside surfaces of motor before disassembly. Make index marks on the ends of the motor and field ring to ensure proper reassembly.

3. Remove brush cover, if used. Measure the brush in the brush holder, use a tire tread depth gauge or small scale to measure from the top of the brush holder to the back of the brush. a. Brush replacement is REQUIRED when the height of the brush measures 11 mm (0.44 in.) below the brush box. If the brush is worn 8 mm (0.31 in.) below the brush box, then brush replacement is RECOMMENDED. See the section DC Motor Maintenance 0620YRM0294 for the replacement of brushes and spring assemblies.

4. Remove capscrews from commutator end of motor. Carefully slide end cover from motor and armature shaft. DO NOT damage parts. A puller is often necessary to separate the end cover from the field ring.

5. Remove screws that fasten pinion end cover to field ring. Remove end cover and armature. Use a plastic or rubber hammer, as necessary, to loosenend cover.

6. Remove pinion end cover from armature.

7. Remove screws that fasten brush holder assembly to commutator end cover.

8. Disassemble components of motor, as necessary, to make repairs. See Figure 17 and the section DC Motor Maintenance 0620YRM0294.