2. Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 5F-7465 Puller Group 1
B 1P-2420 Transmission Repair Stand 1
C 138-7575 Link Bracket 3
D 1P-0510 Driver Group 1
E 1P-1859 Retaining Ring Pliers 1
F 9S-9152 Bearing Puller 1
G 8B-7551 Bearing Puller 1
Start By:
A. Remove the main hydraulic pump. Refer to Disassembly and Assembly, "Main Hydraulic
Pump - Remove" for the machine that is being serviced.
NOTICE
Keep all parts clean from contaminants.
Contamination of the hydraulic system with foreign material will
reduce the service life of the hydraulic system components.
To prevent contaminants from entering the hydraulic system, always
plug or cap the lines, fittings, or hoses as they are disconnected. Cover
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3. any disassembled components and clean them properly before
assembly.
Clean the hydraulic system properly after any major component
exchange or especially after a component failure, to remove any
contamination.
Note: Cleanliness is an important factor. Before the disassembly procedure, clean the exterior of
the component . Cleaning will prevent dirt from entering the internal mechanism.
Note: Only the right pump control is equipped with the proportional reducing valve. The left
pump control starts with Step 4.
Illustration 1 g01200312
1. Remove bolts (2) , pump control (1) , and fitting (3) .
Illustration 2 g01202630
Right Pump Only
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4. 2. Remove bolts (4) . Remove proportional reducing valve (5) from pump control (1) .
Illustration 3 g01202631
Right Pump Only
3. Remove O-ring seal (9) , O-ring seal (8) , O-ring seal (7) , and O-ring seal (6) from the
proportional reducing valve.
Illustration 4 g00706166
4. Remove nut (10) from the pump control.
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5. Illustration 5 g00882598
5. Measure the length of screw (13) for installation purposes. Remove screw (13) . Remove
bolts (11) . Remove cover (12) from the pump control.
Illustration 6 g00706177
6. Remove stopper (14) from the pump control.
Illustration 7 g00706179
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6. 7. Remove O-ring seal (15) and backup ring (16) from the stopper.
8. Repeat Step 4 through Step 7 for the other side of the pump control.
Illustration 8 g00706239
9. Place the pump control in a soft jawed vise. Support pin assembly (17) . Remove piston (18)
from the pump control. Remove pin assembly (17) from the pump control.
Illustration 9 g00706243
10. Remove dowel pin (19) from the pin.
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7. Illustration 10 g00706249
11. Remove bolts (20) . Remove cover assembly (21) from the pump control.
Illustration 11 g00882599
Personal injury can result from parts and/or covers under spring
pressure.
Spring force will be released when covers are removed.
Be prepared to hold spring loaded covers as the bolts are loosened.
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8. 12. Remove O-ring seal (28) . Remove retainer (29) . Remove O-ring seal (27) from the
retainer. Remove nut (23) and nut (25) . Remove setscrew (22) . Remove adjuster (24) .
Remove O-ring seal (26) from the adjuster.
Illustration 12 g00882601
13. Remove spring (30) and spring (31) from the pump control. Remove guide (32) from the
pump control. Remove ball (33) from the guide.
Illustration 13 g00706265
14. Remove pilot piston (34) from the pump control.
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9. Illustration 14 g00706266
Personal injury can result from parts and/or covers under spring
pressure.
Spring force will be released when covers are removed.
Be prepared to hold spring loaded covers as the bolts are loosened.
15. Remove bolts (35) . Remove cover (36) from the pump control.
Illustration 15 g00706267
16. Remove O-ring seal (37) from the cover.
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10. Illustration 16 g00882608
17. Remove control piston (42) , spring (41) , spring (40) , spool (39) , and shims (38) from the
pump control.
Illustration 17 g00706271
18. Remove pin (43) from the pump control.
Illustration 18 g00706272
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11. 19. Remove O-ring seal (44) from the pin.
Illustration 19 g00706273
20. Remove sleeve (45) and control linkage (46) from the pump control.
Illustration 20 g00882609
21. Remove slide plate (47) and dowel (48) from the control linkage.
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12. Illustration 21 g00706275
22. Remove plugs (49) . Remove three plugs (50) from the pump control.
Illustration 22 g01200390
23. Use Tooling (A) to remove seal assembly (52) . Remove bolts (51) , bell housing (53) , and
the gasket.
Illustration 23 g01200392
24. Remove O-ring seal (54) and lip seal (55) from the seal assembly.
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13. Illustration 24 g01200457
25. Attach Tooling (C) and a suitable lifting device to head (10) . Remove bolts (56) and (57)
and head (58) . The weight of head (58) is approximately 41 kg (90 lb).
Illustration 25 g01200458
26. Remove caps (59) from nipples (62) . Remove nipples (62) , bolts (60) , and covers (61)
from head (58) .
Illustration 26 g01200459
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14. 27. Remove O-ring seal (63) from covers (61) .
Illustration 27 g01200460
28. Use Tooling (D) to remove bearings (64) from the head.
Illustration 28 g01200462
29. Remove plugs (65) and (66) from head (58) .
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15. Illustration 29 g01200471
30. Remove orifices (67) from head (58) .
Illustration 30 g01200472
31. Remove O-ring seals (68) and (69) from pump housing (72) . Remove port plates (70) and
(71) .
Note: The port plates must be installed in the original position during assembly.
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17. Illustration 34 g01200477
35. Remove plugs (79) , bolts (77) , and covers (78) from pump housing (72) .
Illustration 35 g01200481
36. Remove O-ring seal (80) from covers (78) .
Illustration 36 g01200482
37. Remove barrel assemblies (81) and (82) from pump housing (72) .
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18. Note: It may be necessary to use string to aid in the removal procedure. The barrel
assemblies must be installed in the original position during assembly.
Illustration 37 g01200485
38. Mark piston assemblies (83) and barrel (84) for assembly. Remove piston assembly (83)
from barrel (84) .
Illustration 38 g01200486
39. Remove pistons (85) from piston plate (86) .
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19. Illustration 39 g01200487
40. Remove cap (87) from barrel (84) .
Illustration 40 g01200488
41. Remove retainer (88) from barrel (84) .
Illustration 41 g01200491
42. Remove springs (89) from barrel (84) .
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20. 43. Repeat Step 38 through Step 42 for the remaining barrel assembly.
Illustration 42 g01200492
Note: The pump has been removed from Tooling (B) for photographic purposes only.
44. Use Tooling (E) to remove retaining rings (90) .
Illustration 43 g01200494
45. Remove shaft assemblies (91) and (92) from pump housing (72) .
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22. Illustration 44 g01200497
46. Use Tooling (F) and a suitable press to remove bearing (93) from shaft assembly (91) .
Illustration 45 g01200498
47. Remove ring (94) from shaft assembly (91) .
Illustration 46 g01200501
48. Use Tooling (G) and a suitable press to remove bearing (95) from shaft assembly (91) .
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23. Illustration 47 g03723277
49. Remove retaining ring (90) from shaft assembly (91) .
50. Repeat Step 46 through Step 49 for shaft (92) .
Illustration 48 g01200504
51. Remove swashplate assemblies (97) and (98) from pump housing (72) .
Note: The swashplate assemblies must be installed in the original position during assembly.
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