AP-1055D and BG-2455D Asphalt Pavers Machine Systems Caterpillar

Disassembly Procedure

Start By:

1. Remove the piston pump (hydraulic generator). 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.

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Illustration 1	g01188187

1. Remove bolts (2) and head (1) from housing (3).
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   Illustration 2	g01188188

2. Remove bearing cup (4) from head (1).

3. Remove port plate (5) from head (1).

4. Remove O-ring seal (6) from head (1).
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   Illustration 3	g01188189

5. Remove bearing cone (7) from housing (3).

6. Remove rotating group (8) from housing (3).
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   Illustration 4	g01188352

7. Remove pistons (10) and plate (9) from barrel assembly (11).
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   Illustration 5	g01188379

8. Remove retainer (12) from barrel assembly (11).
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   Illustration 6	g01188387

9. Remove pins (14) from barrel assembly (11).

10. Remove ring (13) from barrel assembly (11).
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    Illustration 7	g01188392

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    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.

11. Use a suitable press, Tooling (A), and Tooling (B) in order to remove retaining ring (15) from the barrel assembly.
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    Illustration 8	g01188408

12. Remove retaining ring (15), washer (16), spring (17), and washer (18) from the barrel.
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    Illustration 9	g01188190

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    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.

13. Remove piston (19) from housing (3).
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    Illustration 10	g01188191

14. Remove backup ring (20), O-ring seal (21), and O-ring seal (22) from piston (19).
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    Illustration 11	g01188193

15. Remove spring (23) and piston (24) from housing (3).
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    Illustration 12	g01188194

16. Remove plug (25) from housing (3).

17. Remove O-ring seal (26) and (27) from housing (3).
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    Illustration 13	g01188195

18. Remove O-ring seal (28) from plug (25).
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    Illustration 14	g01188196

19. Remove shaft (29) and swashplate (30) from housing (3).
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    Illustration 15	g01188197

20. Remove bearings (31) from housing (3).

21. Remove bearing cone (32) from housing (3).
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    Illustration 16	g01188198

22. Use Tooling (B) and remove retaining ring (33) from housing (3).

23. Remove lip seal (34) from housing (3).
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    Illustration 17	g01189410

24. Remove bolts (41) and control valve (44) from housing (3).

25. Remove O-ring seals (54) from control valve (44).

26. Remove plugs (45) from control valve (44).

27. Remove plug (42) from control valve (44). Remove O-ring seal (43) from plug (42).

28. Remove valve (40), O-ring seal (39), backup ring (38), O-ring seal (37), springs (36), and retainer (35) from control valve (44).

29. Remove valve (50), O-ring seal (49), spring (48), spring (47), and retainer (46) from control valve (44).

30. Remove plugs (51), O-ring seals (52), and spools (53) from control valve (44).