988K Wheel Loader, 834K Wheel Dozer and 836K Compactor Machine Systems Caterpillar

Disassembly Procedure.

Start By:

1. Remove the main control valve

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Illustration 1	g03384557

1. Remove nuts (1) and the washers. Remove manifold (2).
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   Illustration 2	g03384576

2. Remove valve (3).
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   Illustration 3	g03384643

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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.

3. Remove plug (4) and O-ring seal (5). Remove spacers (6) and spring (7). Remove valve (9) and O-ring seal (8). Remove the backup ring and O-ring seal (10). Remove O-ring seal (11).
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   Illustration 4	g03384663

4. Remove valve assembly (12).
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   Illustration 5	g03384579

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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.

5. Remove nut (14) and retainer (13). Remove O-ring seal (15) and (16). Remove washer (17). Remove spring (18) and washer (19). Remove valve (20). Remove O-ring seals (21).
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   Illustration 6	g03385661

6. Remove three O-ring seals (22) and (23). Remove O-ring seal (24). Remove valve assembly (25).
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   Illustration 7	g03385996

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   Illustration 8	g03386021

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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.

7. Remove valve assembly (26).

8. Remove nut (27) and seal (28). Remove retainer assembly (29). Remove spring (30) and O-ring seal (31). Remove valve (32) and seat (33). Remove spring (34). Remove O-ring seals (35) and (36). Remove valve assembly (37) and the O-ring seals.

9. Repeat for the opposite side.
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   Illustration 9	g03385674

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   Illustration 10	g03386055

10. Remove valve (38) and the O-ring seals.

11. Remove screen (39). Remove plug (40) and plug (41).

12. Repeat for the opposite side.
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    Illustration 11	g03386064

13. Remove block (42) and the O-ring seals.
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    Illustration 12	g03386162

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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.

14. Remove screw (49) and the O-ring seal. Remove retainer (48). Remove two shims (47) and six shims (46). Remove spring (45) and retainer (44). Remove stem (43).
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    Illustration 13	g03386269

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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.

15. Remove plug (50) and the O-ring seal. Remove spring (51) and valve (52).
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    Illustration 14	g03386306

16. Remove block (53) and the O-ring seals.
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    Illustration 15	g03386322

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    Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.

17. Remove washers (58) and spring (57). Remove screw (54) from valve (55). Remove plug (56) and O-ring seals.
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    Illustration 16	g03386401

18. Remove plug (59). Remove valve (60) and the O-ring seals. Remove plug (62) and (61).
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    Illustration 17	g03386410

19. Remove three O-rings seals (63) and three O-rings seals (64). Remove O-ring seal (65). Remove valve assembly (66).
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    Illustration 18	g03386575

20. Remove valve (67).
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    Illustration 19	g03386737

21. Remove O-ring seals (70). Remove nut (71), washer (69) and coil assembly (68).
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    Illustration 20	g03386759

22. Remove valve (72) and the O-ring seals.
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    Illustration 21	g03386775

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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.

23. Remove retainer (73), spring (74) and retainer (75).

24. Repeat Step 20 through 23 for the remaining valves.
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    Illustration 22	g03386933

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    Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.

25. Remove screw (79). Remove body (78) and the O-ring seals and back-up seal. Remove spring (77) and valve (76).

26. Remove bolts (85). Remove housing (84) and O-ring seal (83). Remove sleeve (82) and the O-ring seals. Remove five washers (81) and spring (80).
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    Illustration 23	g03387140

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    Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.

27. Remove plug (86), the three O-ring seals, and the backup ring.

28. Remove plug (87) and the O-ring seal. Remove spring (88) and valve (89). Remove valve (90).
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    Illustration 24	g03387163

29. Remove plug (92) and the O-ring seal. Remove plug (91).
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    Illustration 25	g03387172

30. Remove three O-ring seals (93) and (94). Remove O-ring seal (95). Remove studs (96).