D11R Track-Type Tractor Machine Systems Caterpillar

Disassembly Procedure

Start By:

1. Remove the bulldozer control valve.

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Illustration 1	g00536280

1. Remove two bolts (1) and remove cover (2) and the gasket from the valve body.

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Illustration 2	g00536284

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Illustration 3	g00536286

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Plugs (3) and (8) hold spring (5) under compression. To prevent possible personal injury, use caution when the plugs are removed.

2. Remove plug (3), stem (4) and spring (5) from the valve body. Remove plug (6) from the opposite end of the valve body.

3. Inspect the O-ring seal on plugs (3) and (6). Replace the O-ring seals, if necessary.

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Illustration 4	g00536292

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Illustration 5	g00536296

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Plug (7) holds spring (8) under compression. To prevent possible personal injury, use caution when the plug is removed.

4. Remove plug (7), spring (8) and valve (9) from the valve body.

5. Inspect the O-ring seal on plug (7). Replace the O-ring seal, if necessary.

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Illustration 6	g00536332

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Illustration 7	g00536335

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Tilt relief valve assembly (11) holds spring (13) under compression. To prevent possible personal injury, use caution when the valve assembly is removed.

6. Remove two bolts (10), tilt relief valve assembly (11), seat (14), spring (13) and valve spool (12) from the valve body.

7. Inspect the O-ring seal on seat (14). Replace the O-ring seal, if necessary.

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Illustration 8	g00536338

8. Remove valve (15), retainers (16), and spring (17). Remove spacers and shims (18) from housing (19) .

9. Remove nut (20) from the opposite end of housing (19) .

10. Inspect the O-ring seal on housing (19). Replace the O-ring seal, if necessary.

11. Remove screw (24), nut (23), and plug (21) from housing (19), if necessary. Remove pin (22) from screw (24) .

12. Inspect the O-ring seals on plug (21). Replace the O-ring seals, if necessary.

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Illustration 9	g00536344

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Illustration 10	g00536345

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Covers (26) hold springs (28) under compression. To prevent possible personal injury, use caution when the covers are removed.

13. Remove two bolts (25) and remove cover (26) from both ends of the valve body.

14. Remove retainer (27), spring (28), and washer (29) from both ends of the valve body.

15. Inspect the O-ring seal (30) on both covers (26). Replace the O-ring seal, if necessary.

16. Remove the plug and the O-ring seal from both covers (26), if necessary.

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Illustration 11	g00536348

17. Remove valve spool (31) from the control valve body.

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Illustration 12	g00536352

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Illustration 13	g00536354

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Lift relief valve assembly (32) holds springs (34) and (39) under compression. To prevent possible personal injury, use caution when the valve assembly is removed.

18. Remove two bolts (33) and remove lift relief valve assembly (32) from the valve body.

19. Remove spring (34) and seat (36) from the valve body. Check the condition of O-ring seal (35) on seat (36). Replace the O-ring seal, if necessary.

20. Remove valve (37), retainers (38) and spring (39). Remove spacers and shims (40) from housing (42) .

21. Check the condition of O-ring seal (4) on housing (42). Replace the O-ring seal, if necessary.

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Illustration 14	g00536377

22. Remove nut (45) from housing (42) .

23. Remove screw (44), nut (46), and plug (43) from housing (42), if necessary. Remove pin (47) from screw (44) .

24. Inspect the O-ring seals on plug (43). Replace the O-ring seals, if necessary.

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Illustration 15	g00536379

25. Remove valve spool (48) from the valve body.

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Illustration 16	g00536380

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Illustration 17	g00536381

26. Remove plug (49), spring (50) and valve (51) from the control valve body.

27. Inspect the O-ring seal on plug (49). Replace the O-ring seal, if necessary.

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Illustration 18	g00536383

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Housings (52), (53), and (54) holds springs under compression. To prevent possible personal injury, use caution when the housings are removed.

28. Remove two bolts (55) and remove the washers from both ends of the valve body. remove housings (52), (53), and (54) from the valve body.

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Illustration 19	g00536384

29. Remove stem (56) from the valve body.

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Illustration 20	g00536387

30. Check the condition of O-ring seal (57) on housing (53). Replace the O-ring seal, if necessary.

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Illustration 21	g00536392

31. Remove piston (58) and plug (60) from housing (53) .

32. Check the condition of O-ring seal (59) on plug (60). Replace the O-ring seal, if necessary.

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Illustration 22	g00536395

Note: Housings (52) and (54) are disassembled in a similar manner. Follow steps 33 through 37 for both of the housings.

Note: Housing (52) will have two springs (62) .

33. Remove retainer (61), spring (62) and retainer (63) from housing (54) .

34. Check the condition of O-ring seal (64) on housing (54). Replace the O-ring seal, if necessary.

35. Remove plug (66) and the O-ring seal from housing (54), if necessary.

36. Remove screws (65) and plunger (67) from housing (54) .

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Illustration 23	g00536419

37. Remove nut (68) from plunger (67) .

38. Check the condition of O-ring seal (69) on plunger (67). Replace the O-ring seal, if necessary.

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Illustration 24	g00536421

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Illustration 25	g00536423

Note: Use a 1/4 inch - 20 threaded rod to pull valve assembly (70) from the main valve body.

39. Remove plug (72), spacer (71) and valve assembly (70) from the control valve body.

40. Inspect the O-ring seal on plug (72). Replace the O-ring seal, if necessary.

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Illustration 26	g00536425

41. Remove O-ring seals and rings (73) from valve assembly (70) .

42. Inspect the O-ring seals and rings. Replace the O-ring seals and replace the rings, if necessary.

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Illustration 27	g00536429

43. Remove plugs (74) and O-ring seals, if necessary.