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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.

Turn key switch 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.

Remove drive wheel and tire assembly by removing
capscrews (23) and washers (22).

CAUTION

Be careful not to damage the wiring when discon-
necting from the motor and the brake or when re-
moving the motor and the brake from the housing.

9.

Remove drive motor and brake assembly and pull
the wires out of the top of the spindle (12). See the
section

Brakes

1800 YRM 1005.

10.

Support drive unit with sling ran through the center
of the spindle and a hoist or overhead crane.

11.

Loosen bearing lockwasher by bending tab and
then remove lock nut.

12.

Lower MDU from frame.

3

Summary of Contents for A895

Page 1: ...Maintenance MASTER DRIVE UNIT MSW020 025 E A895 MSW025 030 F B895 MPB040 E B827 MPW045 E B802 MPW050 E C802 PART NO 524154891 630 YRM 1003...

Page 2: ...cifications of the original equipment manufacturer Make sure all nuts bolts snap rings and other fastening devices are removed before using force to remove parts Always fasten a DO NOT OPERATE tag to...

Page 3: ...1 Special Precautions 1 Master Drive Unit Repair 3 Remove 3 Disassemble 5 Repair 6 Assemble 6 Install 6 Troubleshooting 7 This section is for the following models MSW020 025 E A895 MSW025 030 F B895 M...

Page 4: ......

Page 5: ...reduction drive unit The three sets of gears do not need adjustment for wear All the parts that rotate have ball bearings or tapered roller bearings The ball bearings are lubed by gear oil and the tap...

Page 6: ...connect a 200 ohm 2 watt resistor between B and B on con troller using insulated jumper wires and hold for 5 seconds Remove the 200 ohm 2 watt resistor be fore reconnecting the battery See Figure 1 o...

Page 7: ...ct 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 securi...

Page 8: ...Master Drive Unit Repair 630 YRM 1003 Figure 3 Drive Unit and Brake Assembly 4...

Page 9: ...ved with the MDU installed on the truck The gear oil may also be changed with the MDU installed Where partial disassembly of the MDU while installed is possible as sembly cleaning and inspection of th...

Page 10: ...earings and or casting 1 Install drive axle and bearings a Clean and inspect the tapered roller bearings for wear or damage Replace as needed b Grease the tapered roller bearings using a standard bear...

Page 11: ...ece shield on the MDU using the four Allen head screws to secure 15 Use the following procedure that applies to your lift truck a Install the lower drive unit compartment cover b Install the lower dri...

Page 12: ...ing 630 YRM 1003 PROBLEM POSSIBLE CAUSE PROCEDURE OR ACTION Oil leaks Loose case cover Tighten case cover Loose fill plug Tighten fill plug Worn or damaged axle oil seal Replace bearing cone and seal...

Page 13: ......

Page 14: ...Yale Materials Handling Corp 1400 Sullivan Dr Greenville NC 27834 2011 630 YRM 1003 3 08 8 05 5 03 1 02 Printed in U S A...

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