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


Main Hydraulic Pump - Assemble
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1.1. Assembly Procedure

Assembly Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
1P-2420  Transmission Repair Stand 
138-7575  Link Bracket 
1P-0510  Driver Group 
1U-8605 Seal Guide 
1P-1859  Retaining Ring Pliers 
1U-6396  O-Ring Assembly Compound 


    Illustration 1g01200516

  1. Install gasket (107) onto pump housing (72).


    Illustration 2g01200514

  2. Install cover (106) and bolts (105) onto pump housing (72).


    Illustration 3g01200512

  3. Install guide pins (104) onto pump housing (72).


    Illustration 4g01200511

  4. Install bearings (103) onto pump housing (72).


    Illustration 5g01200510

  5. Install bearing (102) into swashplate (97).


    Illustration 6g01200509

  6. Install dowel pins (101) into swashplate (97).


    Illustration 7g01200507

  7. Install bearings (100) onto swashplate assembly (97).


    Illustration 8g01200506

  8. Install plate (99) onto swashplate assembly (97).

  9. Repeat Step 5 through Step 8 for swashplate assembly (98).


    Illustration 9g01200504

  10. Install swashplate assemblies (97) and (98) into pump housing (72).

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



    Illustration 10g03723301

  11. Install retaining ring (90) onto shaft assembly (91).


    Illustration 11g01201656

  12. Raise the temperature of bearing (95) and bearing (93). Install bearing (95) and bearing (93) onto shaft assembly (91).


    Illustration 12g01200498

  13. Install ring (94) onto shaft assembly (91).

  14. Repeat Step 11 through Step 13 for shaft assembly (92).


    Illustration 13g01201657


    Illustration 14g01201658

  15. Lower the temperature of the shaft assemblies. Install shaft assemblies (91) and (92) into pump housing (72).


    Illustration 15g01200492

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

  16. Use Tooling (E) to install retaining rings (90).


    Illustration 16g01200491

  17. Install springs (89) into barrel (84).


    Illustration 17g01200488

  18. Install retainer (88) onto barrel (84).


    Illustration 18g01200487

  19. Install cap (87) onto barrel (84).


    Illustration 19g01200486

  20. Install pistons (85) into piston plate (86).


    Illustration 20g01200485

  21. Install piston assembly (83) into barrel (84).

  22. Repeat Step 17 through Step 21 for the remaining barrel assembly.


    Illustration 21g01200482

  23. Install barrel assemblies (81) and (82) into 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 22g01200481

  24. Install O-ring seal (80) onto covers (78).


    Illustration 23g01200477

  25. Install covers (78), bolts (77), and plugs (79) onto pump housing (72).


    Illustration 24g01200478

  26. Install O-ring seals (76) into pump housing (72).


    Illustration 25g01200475

  27. Install plug (76) into covers (75).


    Illustration 26g01200473

  28. Install covers (75), bolts (74), and plugs (73) onto pump housing (72).


    Illustration 27g01200472

  29. Install O-ring seals (68) and (69) onto pump housing (72). Install port plates (70) and (71).

    Note: The port plates must be installed in the original position during assembly.



    Illustration 28g01200471

  30. Install orifices (67) into head (58).


    Illustration 29g01200462

  31. Install plugs (65) and (66) into head (58).


    Illustration 30g01201668

  32. Install bearings (64) into the head.


    Illustration 31g01200459

  33. Install O-ring seal (63) into covers (61).


    Illustration 32g01200458

  34. Install nipples (62), covers (61) and bolts (60) onto head (58). Install caps (59) onto nipples (62).


    Illustration 33g01200457

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

    Personal injury can result from being struck by parts propelled by a released spring force.

    Make sure to wear all necessary protective equipment.

    Follow the recommended procedure and use all recommended tooling to release the spring force.


  35. Attach Tooling (C) and a suitable lifting device to head (10). Install head (58), bolts (56), and bolts (57). The weight of head (58) is approximately 41 kg (90 lb).


    Illustration 34g01200392

  36. Install O-ring seal (54) and lip seal (55) onto the seal assembly.


    Illustration 35g01201683

  37. Install shrink wrap on the shaft. This will protect the seal during the installation procedure. Install the gasket and bell housing (53). Install bolts (51).


    Illustration 36g01201684

  38. Use Tooling (D) to install seal assembly (52).


    Illustration 37g00706275

  39. Install plugs (49). Install three plugs (50) into the pump control.


    Illustration 38g00882609

  40. Install slide plate (47) and dowel (48) onto the control linkage.


    Illustration 39g00706273

  41. Install control linkage (46) and sleeve (45) into the pump control.


    Illustration 40g00706272

  42. Install O-ring seal (44) onto the pin.


    Illustration 41g00706271

  43. Install pin (43) into the pump control.


    Illustration 42g00882608

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

    Personal injury can result from being struck by parts propelled by a released spring force.

    Make sure to wear all necessary protective equipment.

    Follow the recommended procedure and use all recommended tooling to release the spring force.


  44. Install shims (38), spool (39), spring (40), spring (41), and control piston (42) into the pump control.


    Illustration 43g00706267

  45. Install O-ring seal (37) onto the cover.


    Illustration 44g00706266

  46. Install cover (36) onto the pump control. Install bolts (35).


    Illustration 45g00706265

  47. Install pilot piston (34) into the pump control.


    Illustration 46g00882601

  48. Install ball (33) into the guide. Install guide (32) into the pump control. Install spring (31) and spring (30) into the pump control.


    Illustration 47g00882599

  49. Install O-ring seal (26) onto the adjuster. Install adjuster (24). Install setscrew (22). Install nut (23) and nut (25). Install O-ring seal (27) onto the retainer. Install retainer (29). Install O-ring seal (28).


    Illustration 48g00706249

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

    Personal injury can result from being struck by parts propelled by a released spring force.

    Make sure to wear all necessary protective equipment.

    Follow the recommended procedure and use all recommended tooling to release the spring force.


  50. Install cover assembly (21) into the pump control. Install bolts (20).


    Illustration 49g00706243

  51. Install dowel pin (19) into the pin.


    Illustration 50g00706239

  52. Place the pump control in a soft jawed vise. Support pin assembly (17). Install pin assembly (17) into the pump control. Install piston (18) into the pump control.


    Illustration 51g00706179

  53. Install O-ring seal (15) and backup ring (16) onto the stopper.


    Illustration 52g00706177

  54. Install stopper (14) into the pump control.


    Illustration 53g00882598

  55. Install screw (13). Install bolts (11). Install cover (12) into the pump control.


    Illustration 54g00706166

  56. Install nut (10) onto the pump control.

  57. Repeat Step 53 through Step 56 for the other side of the pump control.


    Illustration 55g01202631
    Right Pump Only

  58. Install O-ring seal (6), O-ring seal (7), O-ring seal (8), and O-ring seal (9) onto the proportional reducing valve.


    Illustration 56g01202630
    Right Pump Only

  59. Install proportional reducing valve (5) onto pump control (1). Install bolts (4).


    Illustration 57g01200312

  60. Install pump control (1).

  61. Install bolts (2) and fitting (3).

End By:

  1. Install the main hydraulic pump.

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