AP-655C and BG-2255C Asphalt Pavers Machine Systems Caterpillar

Disassembly Procedure

Start By:

1. Remove the piston pump. Refer to Disassembly and Assembly, "Piston Pump (Hydraulic Generator) - Remove".

Note: Cleanliness is an important factor. Before you begin the disassembly procedure, the exterior of the components should be thoroughly cleaned. This will help to prevent dirt from entering the internal mechanism. Precision components can be damaged by contaminants or by dirt. Perform disassembly procedures on a clean work surface. Keep components covered and protected at all times.

Note: After disassembly has been completed, check the condition of all the components. Refer to Guideline For Reusable Parts, SEBF8032, "Piston Pumps and Motors". During reconditioning, correct any conditions that might have caused the original failure. Information is available to analyze failures on the piston pumps and the motor. Refer to Special Publication, SEBD0641, "Analyzing Axial Piston Pump and Motor Failures".

Note: Put identification marks on all components for installation purposes.

Show/hide table

Illustration 1	g01014763

1. Remove bolts (3) from housing (1) and head (2).
   Show/hide table

   Illustration 2	g01014764

2. Remove head (2) from housing (1).
   Show/hide table

   Illustration 3	g01014765

3. Remove O-ring seal (4) from head (2).
   Show/hide table

   Illustration 4	g01014766

4. Remove bearing cup (5) from head (2).
   Show/hide table

   Illustration 5	g01014767

5. Remove O-ring seals (6) from housing (1).

6. Remove plate (7) from housing (1).
   Show/hide table

   Illustration 6	g01014768

7. Remove bearing cone (9) from housing (1).
   Show/hide table

   Illustration 7	g01014769

8. Remove rotating group (9) from housing (1).
   Show/hide table

   Illustration 8	g01014770

9. Remove plate (10) and pistons (11) from barrel assembly (12).
   Show/hide table

   Illustration 9	g01014771

10. Remove pistons (11) from plate (10).
    Show/hide table

    Illustration 10	g01014772

11. Remove retainer (13) from barrel assembly (12).
    Show/hide table

    Illustration 11	g01014773

12. Remove pins (14) from barrel assembly (12).

13. Remove ring (15) from barrel assembly (12).
    Show/hide table

    Illustration 12	g01014774

    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.

14. Use a press, Tooling (A), and Tooling (B) in order to remove retaining ring (16) from the barrel assembly.
    Show/hide table

    Illustration 13	g01014775

15. Remove retaining ring (16), washer (17), spring (18), and washer (19) from the barrel.
    Show/hide table

    Illustration 14	g01014776

16. Use Tooling (B) in order to remove retaining ring (20) from housing (1).
    Show/hide table

    Illustration 15	g01014777

    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. Remove piston (21) from housing (1).
    Show/hide table

    Illustration 16	g01014778

18. Remove O-ring seal (22), backup ring (23), and O-ring seal (24) from piston (21).
    Show/hide table

    Illustration 17	g01014779

19. Remove spring (25) and piston (26) from the housing.
    Show/hide table

    Illustration 18	g01014780

20. Remove plug (27) from the housing.
    Show/hide table

    Illustration 19	g01014781

21. Remove O-ring seal (28) from plug (27).
    Show/hide table

    Illustration 20	g01014782

22. Remove valve (29) from the housing.
    Show/hide table

    Illustration 21	g01014783

23. Remove valve (30) from the housing.
    Show/hide table

    Illustration 22	g01014784

24. Remove O-ring seal (31), O-ring seal (32), and backup ring (33) from valve (30).
    Show/hide table

    Illustration 23	g01014785

    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.

25. Remove plug (34) from the housing.
    Show/hide table

    Illustration 24	g01014786

26. Remove spring (35) and spring (36) from plug (34).

27. Remove seat (40) from plug (34).

28. Remove O-ring seal (39) from plug (34).

29. Remove guide (37) and (38) from housing (1).
    Show/hide table

    Illustration 25	g01014787

30. Remove shaft (41) from housing (1).
    Show/hide table

    Illustration 26	g01014788

31. Remove swashplate (42) from housing (1).
    Show/hide table

    Illustration 27	g01014789

32. Remove bearings (43) from housing (1).
    Show/hide table

    Illustration 28	g01014790

33. Remove bearing cone (44) from the housing.
    Show/hide table

    Illustration 29	g01014791

34. Remove bearing cup (45) and seal (46) from the housing.