630 YRM 1003 Master Drive Unit Repair
Master Drive Unit Repair
REMOVE
Separate parts of the MDU can be removed without re-
moving the complete MDU. It is not necessary to per-
form each step of the entire procedure to remove some
parts of the MDU. This procedure has steps to remove
the complete MDU. Read the entire procedure first and
do only the steps necessary to make the required re-
pairs.
WARNING
Block each side of the truck under the drive unit
frame. Position blocks on both sides of the load
wheels to prevent the truck from falling.
WARNING
Keep the MDU supported at all times using a sling
and an overhead hoist to avoid personal injury
when removing the MDU from the lift truck.
WARNING
Always disconnect the battery connector so that
the connector is completely free before performing
repairs. If the connector is not completely free, it
can reconnect the battery. Tag the connector - DO
NOT CONNECT.
1. Block lift truck. Raise drive wheel off floor. Refer to
the proper section for your lift truck: Periodic Main-
tenance 8000 YRM 1009, Periodic Maintenance
8000 YRM 1379, or Periodic Maintenance 8000
YRM 1048 - How to Put a Lift Truck on Blocks.
2. Tur n key sw it ch to OFF position and disconnect bat-
tery.
3. Remove the upper drive unit compartment cover.
4. Use the following procedure that applies to your lift
truck:
a. Remove the lower drive unit compartment
cover.
b. Remove the two screws securing the lower
drive unit compartment cover to the frame. Re-
move the lower drive unit compartment cover.
5. Remove the four Allen-head screws from the two
piece shield over the MDU and remove the shield.
WARNING
The capacitor in the transistor controller can hold
an electrical charge after the battery is discon-
nected. Discharge the capacitor before inspecting
or repairing any component in the MDU compart-
ment to prevent personal injury and damage to the
electrical system. Always wear safety glasses.
6. Discharge capacitors. Refer to Special Precau-
tions.
7. Remove control handle. Refer to the section Steer-
ing Mechanism 1600 YRM 1004.
8. Removedrivewheelandtireassemblybyremoving
capscrews (23) and washers (22).
CAUTION
Be careful
not to damage the wiring when discon-
necting f
rom the motor and the brake or when re-
moving th
e motor and the brake from the housing.
9. Remove dr
ive motor and brake assembly and pull
the wires
out of the top of the spindle (12). See the
section B
rakes 1800 YRM 1005.
10. Support d
rive unit with sling ran through the center
of the sp
indle and a hoist or overhead crane.
11. Loosen be
aring lockwasher by bending tab and
then rem
ove lock nut.
12. Lower MD
Ufromframe.
3
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