980M Tier 4 and 982M Tier 4 Wheel Loaders Machine Systems Caterpillar

Disassembly Procedure

Start By:

1. Remove the piston pump (hydraulic and steering).

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Illustration 1	g02581456

1. Remove bolts (1) from valve group (2). Remove valve group (2) from the piston pump.
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   Illustration 2	g00990315

2. Remove plug (3) from valve (2).

3. Remove O-ring seal (4), ring (5), and needle valve (6) from valve (2).
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   Illustration 3	g00990306

4. Remove plug (7) from valve (2).

5. Remove O-ring seal (8) from plug (7).

6. Remove plug (9) from valve (2).

7. Remove O-ring seal (10) from plug (9).

8. Remove plug (11) from valve (2).

9. Remove O-ring seal (12) from plug (11).
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   Illustration 4	g00990325

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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.

   Note: Do not loosen adjustment screw or the locknut on plug (13) or plug (15).

10. Remove plug (13) from valve (2).

11. Remove O-ring seal (14) from plug (13).

12. Remove plug (15) from valve (2).

13. Remove O-ring seal (16) from plug (15).
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    Illustration 5	g00990339

14. Remove guide (17), spring (18), pin (19), guide (20), and spool (21) from valve (2).

15. Remove guide (22), spring (23), guide (24), and spool (25) from valve (2).
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    Illustration 6	g02600858

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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.

16. Remove plug (30) from head (31). Slowly remove bolts (33) in order to release the spring force on the valve assembly.

17. Remove head (31) from housing (26).

18. Remove bolts (27), cover (28), and O-ring seal (29) from housing (26).
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    Illustration 7	g02592977

19. Remove piston (36) and remove spring (35) from piston rod (34).

20. Remove piston (38) from piston rod (37).
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    Illustration 8	g02592978

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    Illustration 9	g02592980

21. Remove pin (39) from head (31).

22. Remove piston rod (34) from head (31) if removal is necessary.

23. Remove piston rod (37) from head (31) if removal is necessary.

24. Use Tooling (A) in order to remove bearing cup (40) from head (31).
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    Illustration 10	g02597071

25. Remove bearing cone (42). Remove shims (41) that are underneath bearing cone (42). Remove plate (43) from the pump group. Remove pins (44) and gasket (45) from the pump housing.
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    Illustration 11	g02597521

26. Remove bolts (49). Remove locking plates (48) and remove spacer plates (47) from swashplate (46).
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    Illustration 12	g02597534

27. Remove plug (50) from housing (26).

28. Remove rotating group (51) and remove shims (52) from shaft (53).
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    Illustration 13	g02597758

29. For assembly purposes, place identification marks on pistons (54). The position of the identification marks should correspond to the position of barrel (55) and plate (56). Remove pistons (54) and remove plate (56) from barrel (55).
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    Illustration 14	g02600856

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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.

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    Illustration 15	g02597936

30. Use Tooling (B) and a suitable press in order to compress spring (59). Remove retaining ring (57) from barrel (55).

31. Remove the following parts from barrel (55): spacer (60), spring (59) and spacer (58).
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    Illustration 16	g02598305

32. Remove swashplate (46). Remove shaft (53) and bearing cone (61) from housing (26).
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    Illustration 17	g02598315

33. Remove bearing cone (61) from shaft (53).
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    Illustration 18	g02597532

34. Remove lip seal (62) from housing (26).
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    Illustration 19	g02598359

35. Use Tooling (B) in order to remove retaining rings (63) from housing (26). Remove remaining lip seal (64) from the housing (26).
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    Illustration 20	g02598496

36. Remove screws (67). Remove bearing (65) and bearing (66) from housing (26).
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    Illustration 21	g02598576

37. Use Tooling (C) in order to remove bearing cup (68) from the housing.