980K Wheel Loader Machine Systems Caterpillar

Piston Pump Mounting Group Remove

Start By:

1. Remove the Piston Pump (Brake, Pilot, Fan).

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Illustration 1	g06311962

1. Remove nut (1) and gear (2).
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   Illustration 2	g06311968

2. Remove bolt (3), flange (4), and the O-ring seal.
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   Illustration 3	g06311970

3. Use Tooling (A) and a suitable press to remove bearing (5) from flange (4).

Pump Disassembly Procedure

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Illustration 4	g00670363

1. To protect the shaft seal, use an adhesive tape to cover the drive shaft.
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   Illustration 5	g00669721

2. Remove bolts (2) and pressure and flow compensator valve (1) from piston pump (3).
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   Illustration 6	g00670188

3. Remove O-ring seals (4) from compensator valve (1).
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   Illustration 7	g00670190

4. Remove plug (5) from compensator valve (1). Repeat for opposite side.
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   Illustration 8	g00670191

5. Remove O-ring seal (6) from plug (5).
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   Illustration 9	g00670192

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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.

6. Remove plug (7) from compensator valve (1).
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   Illustration 10	g02581076

7. Remove O-ring seal (8) from plug (7). Remove plate (9), spring (10), spring (11), and guide (12) from compensator valve (1).
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   Illustration 11	g00670197

8. Remove plug (13) from compensator valve (1).
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   Illustration 12	g00670198

9. Remove spool (14) from compensator valve (1). Remove spacer (15) from plug (13).
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   Illustration 13	g00670199

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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.

10. Remove plug (16) from compensator valve (1).
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    Illustration 14	g02581078

11. Remove O-ring seal (17) from plug (16). Remove plate (18), spring (19), spring (20), and guide (21) from compensator valve (1).
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    Illustration 15	g00670202

12. Remove plug (22) from compensator valve (1).
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    Illustration 16	g00670203

13. Remove spool (23) from compensator valve (1). Remove spacer (24) from plug (22).
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    Illustration 17	g02580532

14. Remove bolts (25) from head assembly (26).
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    Illustration 18	g00669723

15. Remove head assembly (26) from pump body (27).
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    Illustration 19	g00669727

16. Remove O-ring seal (28) and port plate (29) from head assembly (26).
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    Illustration 20	g00669728

17. Remove bearing cup (30).
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    Illustration 21	g00669729

18. Remove O-ring seal (31).
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    Illustration 22	g00669730

19. Remove bearing cone (32) from the shaft assembly.
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    Illustration 23	g00669731

20. Remove adjustment shim (33).
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    Illustration 24	g00669732

21. Remove plug (34).
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    Illustration 25	g00669738

22. Remove O-ring seal (35) from plug (34).
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    Illustration 26	g00669742

23. Carefully place the pump in a horizontal position.

24. Remove rotary group (36).
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    Illustration 27	g00669741

25. Remove piston assemblies (37) from barrel assembly (38).
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    Illustration 28	g00669743

26. Remove retaining ball (39) from barrel assembly (38).
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    Illustration 29	g00669744

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    Illustration 30	g00669745

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    Sudden release of spring force can cause injury. To prevent the possibility of injury, follow the procedure to relieve the spring pressure.

    Note: There is spring force against retaining ring (43). When retaining ring (43) is removed, the spring force will be released. Removal of the internal components in barrel (38) should be performed in a press. This is done to retain spring (42) and retaining ring (43).

27. Use a suitable press and Tooling (A) to compress the spring in barrel assembly (38).

28. Remove retaining ring (43) from the barrel assembly (38).

29. Remove retaining ring (43), spring (42), guide (41), and pins (40) from the barrel assembly.
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    Illustration 31	g00670204

30. Move the swashplate up and down to remove the control piston (44).
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    Illustration 32	g00670205

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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: To release piston rod (45) from the swashplate, lift the swashplate a little and move the piston rod sideways.

31. Remove piston rod (45).
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    Illustration 33	g00670206

32. Remove swashplate (46).
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    Illustration 34	g00670207

33. Remove spring (47).
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    Illustration 35	g00670223

34. Remove bearings (48).
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    Illustration 36	g00670298

35. Remove shaft assembly (49).
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    Illustration 37	g00670301

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    Illustration 38	g00670302

36. Remove retaining ring (50).

37. Use Tooling (A) to remove seal (51).
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    Illustration 39	g00670360

38. Remove two plugs (52) from pump body (27). Inspect the O-ring seals on the plugs. Replace the O-ring seals, if necessary.
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    Illustration 40	g00670361

39. Remove bearing cup (53) from pump body (27).
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    Illustration 41	g00670362

40. Use Tooling (B) and a suitable press to remove bearing cone (54) from shaft assembly (49).

Piston Pump Mounting Group Install

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Illustration 42	g06311970

1. Use Tooling (A) and a suitable press to install bearing (5) into flange (4).
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   Illustration 43	g06311968

2. Install the O-ring seal, flange (4), and bolt (3) onto the piston pump.
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   Illustration 44	g06311962

3. Install gear (2) and nut (1). Tighten nut (1) to a toque of 200 ± 40 N·m (148 ± 30 lb ft).

End By:

1. Install the Piston Pump (Brake, Pilot, Fan) .