320D2 GC Excavator Machine Systems Main Hydraulic Pump - Disassemble Caterpillar


Main Hydraulic Pump - Disassemble
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1.1. Disassembly Procedure

Disassembly Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
5F-7465  Puller Group 
1P-2420  Transmission Repair Stand 
138-7575  Link Bracket 
1P-0510  Driver Group 
1P-1859  Retaining Ring Pliers 
9S-9152  Bearing Puller 
8B-7551  Bearing Puller 

Start By:

  1. Remove the main hydraulic pump.


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 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 1g01200312

  1. Remove bolts (2), pump control (1), and fitting (3).


    Illustration 2g01202630
    Right Pump Only

  2. Remove bolts (4). Remove proportional reducing valve (5) from pump control (1).


    Illustration 3g01202631
    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 4g00706166

  4. Remove nut (10) from the pump control.


    Illustration 5g00882598

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


    Illustration 6g00706177

  6. Remove stopper (14) from the pump control.


    Illustration 7g00706179

  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 8g00706239

  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 9g00706243

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


    Illustration 10g00706249

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


    Illustration 11g00882599

    ------ WARNING! ------

    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.


    Illustration 12g00882601

  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 13g00706265

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


    Illustration 14g00706266

    ------ WARNING! ------

    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 15g00706267

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


    Illustration 16g00882608

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


    Illustration 17g00706271

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


    Illustration 18g00706272

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


    Illustration 19g00706273

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


    Illustration 20g00882609

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


    Illustration 21g00706275

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


    Illustration 22g01200390

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


    Illustration 23g01200392

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


    Illustration 24g01200457

  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 25g01200458

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


    Illustration 26g01200459

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


    Illustration 27g01200460

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


    Illustration 28g01200462

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


    Illustration 29g01200471

  30. Remove orifices (67) from head (58).


    Illustration 30g01200472

  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.



    Illustration 31g01200473

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


    Illustration 32g01200475

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


    Illustration 33g01200478

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


    Illustration 34g01200477

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


    Illustration 35g01200481

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


    Illustration 36g01200482

  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.



    Illustration 37g01200485

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


    Illustration 38g01200486

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


    Illustration 39g01200487

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


    Illustration 40g01200488

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


    Illustration 41g01200491

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

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


    Illustration 42g01200492

    Note: The pump has been removed from Tooling (B) for photographic purposes only.

  44. Use Tooling (E) to remove retaining rings (90).


    Illustration 43g01200494

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


    Illustration 44g01200497

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


    Illustration 45g01200498

  47. Remove ring (94) from shaft assembly (91).


    Illustration 46g01200501

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


    Illustration 47g03723277

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

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


    Illustration 48g01200504

  51. Remove swashplate assemblies (97) and (98) from pump housing (72).

    Note: The swashplate assemblies must be installed in the original position during assembly.



    Illustration 49g01200506

  52. Remove plate (99) from swashplate assembly (97).


    Illustration 50g01200507

  53. Remove bearings (100) from swashplate assembly (97).


    Illustration 51g01200509

  54. Remove dowel pins (101) from swashplate (97).


    Illustration 52g01200510

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

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


    Illustration 53g01200511

  57. Remove bearings (103) from pump housing (72).


    Illustration 54g01200512

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


    Illustration 55g01200514

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


    Illustration 56g01200516

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

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