630 YRM 1003 Master Drive Unit Repair
Legend for Figure 3
1. WIRE HARNESS
2. SLEEVE
3. NUT
4. LOCKWASHER
5. FLAT WASHER
6. BEARING CONE AND CUP
ASSEMBLY
7. BEARING CONE
8. BEARING CUP
9. BEARING CUP
10. BEARING CONE
11. ALLEN-HEAD SCREW
12. SPINDLE
13. O-RING
14. BALL BEARING
15. SPACER
16. BRAKE ASSEMBL
Y
17. BRAKE HUB
18. KEY
19. KEY
20. DRIVE MOTOR
21. PIVOT BUSHING
22. WASHER
23. CAPSCREW
24. DRIVE TIRE AND WHEEL
25. MDU
26. DRIVE AXLE
27. BEARING CONE AND SEAL
ASSEMBLY
28. BEARING CUP
29. PIN
30. DRIVE GEAR
31. NUT
32. BALL BEARING
33. GEAR AND PINION ASSEMBLY
34. GEAR AND PINION
ASSEMBLY
35. NUT
36. GEAR
37. OIL SLINGER
38. CASTING
39. LOCKWASHER
40. CAPSCREW
41. FILL PLUG
42. ALLEN-HEAD SCREW
43. LOCKWASHER
44. COVER
45. ALLEN-HEAD SCREW
46. LOCKWASHER
DISASSEMBLE
Refer to Figure 3 f
or the following instructions.
NOTE: To tal disa
ssembly may not be necessary to re-
pairtheMDU.Doo
nly the steps necessary to complete
repairs.
TheMDUcanberem
oved from the lift truck to be com-
pletely disasse
mbled. See Remove. However, certain
components may b
e removed with the MDU installed
in the truck. Th
e drive motor, brake, drive wheel and
tire assembly,
and pivot bushing (21) may be removed
with the MDU ins
talled 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, clean
ing, and inspection of the MDU is much
easier when co
mpletely removed. The following steps
refer to the di
sassembly of an MDU which has been re-
moved from th
e drive unit compartment. See Figure 3.
1. Remove MDU fr
om lift truck. Refer to Remove.
2. Place the MDU o
n a clean workbench.
3. Detach steeri
ng spindle by removing Allen-head
screws (11) i
f necessary.
4. Remove pivot
bushings (21) if necessary.
CAUTION
Disposal of lubricants and fluids must meet local
environmental regulations.
5. Remove cover and drain oil:
a. Remove eight caps
crews (40) and lockwashers
(39).
b. Remove two Allen-
head screws (42) and wash-
ers (43).
c. Using the slots p
rovided, gently pry the top and
bottom sides of c
over alternately from the MDU.
d. Remove cover and
place on a clean work-
bench.
e. Remove two pins (
29) from MDU housing if
necessary.
CAUTION
Use a hammer and a soft punch when removing
bearings to avoid damage to bearings and/or cast-
ing.
6. Remove drive axle and bearings:
a. Remove nut (31) and gear (30).
b. Remove drive axle.
c. Remove bearing cone and seal assembly (27).
7. Remove gear and pinion assemblies and bearings:
a. Remove gear and pinion assemblies (33, 34)
by hand.
b. Remove bearings (32) from casting and cover.
5
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