Hyster-Yale Electric Pallet Truck MPW050-EN24T2260

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: When inspecting brush conditions and motor commutator conditions for head damage or abnormal wear, the battery maintenance and condition should be eliminated as a cause first.

NOTE: The brushes and commutator can be inspected, the brushes can be replaced, and Stoning the Commutator can be done with the motor installed in the truck.

NOTE: Inspect the brushes and commutator every 350 hours for best operation and to prevent motor damage.

NOTE: The following procedure is for inspecting the brushes and commutator with the motor installed in the lift truck.

WARNING: Compressed air can move particles so that they cause injury to the user or to other personnel. Make sure that the path of the compressed air is away from all personnel.

NOTE: Vacuum cleaning, when possible, is the recommendation of manufacturers of electric motors.

Drive wheels raised for commutator rotation?

Battery removed for motor access?

Brush covers removed at rear of motor?

1. Motor brushes must be replaced before they are worn enough to damage the surface of the commutator. Move the brush spring and remove a brush from its brush holder. Install new brushes as a set if length of any brush is worn to a minimum length. See Table 3. If the brush lead is fastened to the brush with a rivet, install a new set of brushes if it is worn to within 3 mm (0.118 in.) of the rivet. If a brush does not move easily in its holder, a new set of brushes must be installed.

The lead wire for some brushes is installed directly into the carbon compound of the brush. New brushes must be installed before the lead wire cuts a groove in the commutator. Install a new brush set when a brush is worn to a short length.

Brushes are made to different specifications for motors used in different applications. Use only new brushes approved by Yale Company for that motor.

NOTE: For some models of lift trucks, the battery does not need to be removed to access the electric motors. Other models will require the removal of the battery before gaining access to the electric motors.

2. Remove battery as necessary for your lift truck. See How To Remove Battery in the Operating Manual or the YRM section Periodic Maintenance for your lift truck.

WARNING: Compressed air can move particles so they cause injury to the user or to other personnel. Verify the path of the compressed air is away from all personnel. Wear protective goggles of a face shield to prevent injury to the eyes.

3. Remove access plate to motors. Remove brush covers to motor. See Figure 2. Wear eye protection. Use a vacuum cleaner or compressed air to remove dirt and brush dust from commutator area.

4. Make a note of the arrangement and connections of the brush assembly. See Figure 4. The new brushes must be installed in the same positions from which the worn brushes were removed.

5. Loosen screw that fastens brush wire to its terminal. Remove brush springs and brushes.

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

Move lift truck to a safe, level area.

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

Block drive tire to prevent movement. See the section Periodic Maintenance 8000YRM1048, Periodic Maintenance 8000YRM1009, or Periodic Maintenance 8000YRM1379 for your lift truck.

Remove the upper drive unit compartment cover.

Discharge the capacitor. See Special Precautions.

Tag, identify, and disconnect the contactor coil wires.

Test contactor coil using an ohmmeter.

Touch the probes of the ohmmeter to the coil terminals and measure the resistance between the terminals.

Replace contactor if coil resistance readings measure outside of specifications. For contactor coil resistance values, refer to Table 1.