303E CR, 303.5E, 304E, 305.5E and 305E Mini Hydraulic Excavators Machine Systems Main Hydraulic Pump - Disassemble Caterpillar

Disassembly Procedure

Start By:

1. Remove the hydraulic pump. Refer to , "Main Hydraulic Pump - Remove".

Show/hide table

Illustration 1	g01222466

1. Remove bolts (1), valve (2), and plug (3).
   Show/hide table

   Illustration 2	g01222469

   Show/hide table

   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.

2. Remove plug (8), O-ring seal (9), spring (7), retainer (6), retainer (5), and spool (4).
   Show/hide table

   Illustration 3	g01222471

3. Remove O-ring seals (10).
   Show/hide table

   Illustration 4	g01222473

4. Remove two bolts (11) and gear pump (12).
   Show/hide table

   Illustration 5	g01222474

5. Remove O-ring seals (13).
   Show/hide table

   Illustration 6	g01222477

6. Remove bolts (15) and cover (14).
   Show/hide table

   Illustration 7	g01222478

7. Remove O-ring seals (16).
   Show/hide table

   Illustration 8	g01222481

8. Remove gears (17) from housing (18).
   Show/hide table

   Illustration 9	g01222482

9. Remove bolts (19) and cover (20).
   Show/hide table

   Illustration 10	g01222484

10. Use Tooling (A) in order to remove retaining ring (21).

11. Remove lip seal (22).
    Show/hide table

    Illustration 11	g01222486

12. Remove O-ring seal (23), screws (25), bearings (24), and bearing (26).
    Show/hide table

    Illustration 12	g01222487

13. Remove gasket (27), shim (29), and shaft (28).
    Show/hide table

    Illustration 13	g01222488

14. Remove O-ring seal (31) and swashplate (32) from housing (30).
    Show/hide table

    Illustration 14	g01222489

15. Remove pistons (33), retainer (34), bearing (35), and barrel (36).
    Show/hide table

    Illustration 15	g01222491

16. Remove pins (37).
    Show/hide table

    Illustration 16	g01222560

    Show/hide table

    Illustration 17	g01222562

    Show/hide table

    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.

17. Use Tooling (A) and Tooling (B) in order to remove retaining ring (38).

18. Remove washer (39), spring (40), and washer (41) from barrel (36).
    Show/hide table

    Illustration 18	g01222563

19. Remove port plate (42) and shim (43).
    Show/hide table

    Illustration 19	g01222565

    Show/hide table

    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.

20. Remove pin (45), spring (46), spring (47), and retainer (44).
    Show/hide table

    Illustration 20	g01222567

21. Remove retainer (48).
    Show/hide table

    Illustration 21	g01222568

22. Remove spool (49).
    Show/hide table

    Illustration 22	g01222569

23. Remove bearing (50).