326F, 329F and 330F Excavators Machine Systems Caterpillar

Disassembly Procedure

Start By:

1. Remove the pump drive coupling.

Note: Only the right pump control is equipped with the proportional reducing valve. The left pump control starts with Step 4.

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Illustration 1	g02405999

1. Remove bolts (2) and pump control (1).
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   Illustration 2	g02406017
   Right Pump Only

2. Remove proportional reducing valve (3) from pump control (1).
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   Illustration 3	g02406097
   Right Pump Only

3. Remove O-ring seal (7), O-ring seal (6), O-ring seal (5), and O-ring seal (4) from the proportional reducing valve (3).
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   Illustration 4	g02406264

4. Remove O-ring seals (8) and O-ring seal (9). Remove nut (10) from the pump control.
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   Illustration 5	g02406297

5. Measure the length of screw (13) for installation purposes. Remove screw (13). Remove bolts (11). Remove cover (12) from the pump control.
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   Illustration 6	g02406317

6. Remove stopper (14) from the pump control.
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   Illustration 7	g02406319

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.
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   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.
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   Illustration 9	g00706243

10. Remove dowel pin (19) from the pin.
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    Illustration 10	g00706249

11. Remove bolts (20). Remove cover assembly (21) from the pump control.
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    Illustration 11	g00882599

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    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.

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.
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    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.
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    Illustration 13	g00706265

14. Remove pilot piston (34) from the pump control.
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    Illustration 14	g00706266

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    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.
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    Illustration 15	g00706267

16. Remove O-ring seal (37) from the cover.
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    Illustration 16	g00882608

17. Remove control piston (42), spring (41), spring (40), spool (39), and shims (38) from the pump control.
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    Illustration 17	g02406460

18. Remove pin (43) from the pump control.
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    Illustration 18	g02406463

19. Remove O-ring seal (44) from the pin (43).
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    Illustration 19	g00706273

20. Remove sleeve (45) and control linkage (46) from the pump control.
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    Illustration 20	g00882609

21. Remove slide plate (47) and dowel (48) from the control linkage.
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    Illustration 21	g00706275

22. Remove plugs (49). Remove three plugs (50) from the pump control.
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    Illustration 22	g01200390

23. Use Tooling (A) to remove seal assembly (52). Remove bolts (51), bell housing (53), and the gasket.
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    Illustration 23	g01200392

24. Remove O-ring seal (54) and lip seal (55) from the seal assembly.
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    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).
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    Illustration 25	g01200458

26. Remove caps (59) from nipples (62). Remove nipples (62), bolts (60), and covers (61) from head (58).
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    Illustration 26	g01200459

27. Remove O-ring seal (63) from covers (61).
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    Illustration 27	g01200460

28. Use Tooling (D) to remove bearings (64) from the head.
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    Illustration 28	g01200462

29. Remove plugs (65) and (66) from head (58).
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    Illustration 29	g01200471

30. Remove orifices (67) from head (58).
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    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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    Illustration 31	g01200473

32. Remove plugs (73), bolts (74), and covers (75) from pump housing (72).
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    Illustration 32	g01200475

33. Remove plug (76) from covers (75).
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    Illustration 33	g01200478

34. Remove O-ring seals (76) from pump housing (72).
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    Illustration 34	g01200477

35. Remove plugs (79), bolts (77), and covers (78) from pump housing (72).
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    Illustration 35	g01200481

36. Remove O-ring seal (80) from covers (78).
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    Illustration 36	g01200482

37. Remove barrel assemblies (81) and (82) from pump housing (72).

    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.

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    Illustration 37	g01200485

38. Mark piston assemblies (83) and barrel (84) for assembly. Remove piston assembly (83) from barrel (84).
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    Illustration 38	g01200486

39. Remove pistons (85) from piston plate (86).
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    Illustration 39	g01200487

40. Remove cap (87) from barrel (84).
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    Illustration 40	g01200488

41. Remove retainer (88) from barrel (84).
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    Illustration 41	g01200491

42. Remove springs (89) from barrel (84).

43. Repeat Step 38 through Step 42 for the remaining barrel assembly.
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    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).
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    Illustration 43	g01200494

45. Remove shaft assemblies (91) and (92) from pump housing (72).
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    Illustration 44	g01200497

46. Use Tooling (F) and a suitable press to remove bearing (93) from shaft assembly (91).
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    Illustration 45	g01200498

47. Remove ring (94) from shaft assembly (91).
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    Illustration 46	g01200501

48. Use Tooling (G) and a suitable press to remove bearing (95) from shaft assembly (91).
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    Illustration 47	g01200502

49. Remove spacer (96) and retaining ring (90) from shaft assembly (91).

50. Repeat Step 46 through Step 49 for shaft (92).
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    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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    Illustration 49	g01200506

52. Remove plate (99) from swashplate assembly (97).
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    Illustration 50	g01200507

53. Remove bearings (100) from swashplate assembly (97).
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    Illustration 51	g01200509

54. Remove dowel pins (101) from swashplate (97).
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    Illustration 52	g01200510

55. Remove bearing (102) from swashplate (97).

56. Repeat Step 52 through Step 55 for swashplate assembly (98).
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    Illustration 53	g01200511

57. Remove bearings (103) from pump housing (72).
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    Illustration 54	g01200512

58. Remove guide pins (104) from pump housing (72).
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    Illustration 55	g01200514

59. Remove bolts (105) and cover (106) from pump housing (72).
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    Illustration 56	g01200516

60. Remove gasket (107) from pump housing (72).