320D2 GC Excavator Machine Systems Main Hydraulic Pump - Remove and Install Caterpillar


Main Hydraulic Pump - Remove and Install
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1.1. Removal Procedure
2.1. Installation Procedure

Removal Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
138-7575  Link Bracket 
1U-9200  Lever Puller Hoist 
138-7573  Link Brackets 

Start By:

  1. Remove the muffler.

  2. Release the hydraulic system pressure.

  1. Drain the hydraulic tank.


    Illustration 1g01213554

  2. Disconnect hose assemblies (4). Disconnect harness assembly (3). Remove bolts (1) and reposition valve assembly (2).


    Illustration 2g01213993

  3. Remove remaining bolts (1).


    Illustration 3g01214323

  4. Remove bolts (5) and cover assembly (6).


    Illustration 4g01214398


    Illustration 5g01214401

  5. Remove bolts (9) and bracket assembly (10). Remove cover assembly (12).


    Illustration 6g01214551

  6. Disconnect hose assemblies (13). Disconnect harness assembly (14).


    Illustration 7g01214600

  7. Disconnect harness assemblies (15) and (20). Disconnect hose assemblies (16), (17), (18), and (19).


    Illustration 8g01214772

  8. Disconnect hose assembly (21). Disconnect hose assemblies (22).


    Illustration 9g01215271

  9. Remove bolts (23). Remove all mounting hardware from harness assembly (24) and reposition.


    Illustration 10g01215377

  10. Disconnect hose assemblies (25).


    Illustration 11g01215389

  11. Remove bolts (26). Disconnect tube assembly (27).


    Illustration 12g01215450

  12. Remove bolts (28) and reposition filter assembly (29). Remove bolts (30) and reposition filter assembly (31).


    Illustration 13g01215556

  13. Attach Tooling (A), (B), and (C) and a suitable lifting device to main hydraulic pump (32). The weight of main hydraulic pump (32) is approximately 250 kg (550 lb). Remove bolts (33) and main hydraulic pump (32).


    Illustration 14g01215580

  14. Remove bolt (34) and gear (35).


    Illustration 15g01215665

  15. Remove bolts (36) and auxiliary pump (37).


    Illustration 16g01215672

  16. Remove Coupling (39) and O-ring seal (40). Remove bolts (38) and adapter (41).


    Illustration 17g01215724

  17. Remove bolts (42) and pilot pump (43).


    Illustration 18g01215928

  18. Remove O-ring seal (44).

Installation Procedure



    Illustration 19g01215928

  1. Install O-ring seal (44).


    Illustration 20g01215724

  2. Install pilot pump (43) and install bolts (42).


    Illustration 21g01215672

  3. Install adapter (41) and install bolts (38). Install O-ring seal (40) and install coupling (39).


    Illustration 22g01215665

  4. Install auxiliary pump (37) and install bolts (36).


    Illustration 23g03397798

  5. If equipped with flexible coupling. Tighten bolts (34A) to a torque of 100 ± 10 N·m (73.75600 ± 7.37560 lb ft). Tighten bolts that hold coupling insert (35A) to a torque of 320 ± 10 N·m (236 ± 7 lb ft).


    Illustration 24g01215580

  6. If equipped with hub type coupling. Install gear (35) and install bolt (34). Torque bolt (34) to 240 ± 20 N·m (177 ± 15 lb ft).


    Illustration 25g01215556

  7. Install main hydraulic pump (32). The weight of main hydraulic pump (32) is approximately 250 kg (550 lb). Install bolts (33). Remove Tooling (A), (B), and (C). Remove the suitable lifting device.


    Illustration 26g01215450

  8. Position filter assembly (31) and install bolts (30). Position filter assembly (29) and install bolts (28).


    Illustration 27g01215389

  9. Connect tube assembly (27) and install bolts (26).


    Illustration 28g01215377

  10. Connect hose assemblies (25).


    Illustration 29g01215271

  11. Position harness assembly (24) and install bolts (23).


    Illustration 30g01214772

  12. Connect hose assemblies (22). Connect hose assembly (21).


    Illustration 31g01214600

  13. Connect hose assemblies (16), (17), (18), and (19). Connect harness assemblies (15) and (20).


    Illustration 32g01214551

  14. Connect harness assembly (14). Connect hose assembly (13).


    Illustration 33g01214401


    Illustration 34g01214398

  15. Install cover assembly (12). Install bracket assembly (10) and install bolts (9).


    Illustration 35g01214323

  16. Install cover assembly (6) and install bolts (6).


    Illustration 36g01213554

  17. Position valve assembly (2) and install bolts (1). Connect harness assembly (3). Connect hose assembly (4).

  18. Purge the air from the main hydraulic pump. Refer to Testing and Adjusting, "Main Hydraulic Pump Air - Purge".

End By:

  1. Install the muffler.

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