Troubleshooting - Yale 524150797 Maintenance Manual

Master Drive Unit
CAUTION
To prevent damage to the brake assembly always
follow the special procedure for brake adjustment
when adjusting the brake.
7. Install and adjust the brake if removed. Refer to
the section Brakes 1800YRM1505.
8. Mount the drive wheel on the axle shaft and install
lug nuts. Tighten lug nuts to 120 N•m (88 lbf ft).
9. Connect the motor wires and cables. Attach the
harness clamps.
PROBLEM
Lift truck will not move.
MDU makes noise.
Oil leakage at upper part in motor
compartment.
Oil leakage at housing cover.
6
10. Install the steer components as removed. See the
11. Lower the truck to the floor.
12. Connect the battery and turn the key switch to the
13. Test the operation of the truck.
14. Install the drive unit compartment cover and re-

Troubleshooting

POSSIBLE CAUSE
Motor not operating.
Damaged gears or bearings.
Dry or damaged bearings.
Worn or damaged gears.
Motor seal defective.
Housing cover not sealed to hous-
ing.
Capscrews not sealed or not tight-
ened to correct torque.
section Steering Mechanism 1600YRM1504.
ON position.
turn truck to service.
PROCEDURE OR ACTION
Check wiring or repair motor.
Check battery, battery connection,
and truck fuses.
Replace drive unit.
Replace drive unit.
Replace drive unit.
Replace motor seal.
Clean, seal, and tighten housing
cover capscrews to correct torque.
Tighten housing cover capscrews
to
32 N•m (24 lbf ft).
0630 YRM 1503
correct torque,