345C MHPU Mobile Hydraulic Power Unit Machine Systems Caterpillar

Disassembly Procedure

Start By:

1. Remove the main control valve. Refer to Disassembly and Assembly, "Main Control Valve - Remove".

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Illustration 1	g01188313

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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.

1. Remove plug (1), backup ring (3), O-ring seal (2), spring (4), and poppet (5) .

2. Repeat Step 1 for the remaining plugs.

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Illustration 2	g01188315

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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 bolts (6), plate (7), O-ring seal (8), valve (9), spring (12), poppet (15), and sleeve (18) .

4. Remove plug (10), O-ring seal (16), backup ring (13), and sleeve (19) .

5. Remove plug (11), O-ring seal (17), and backup ring (14) .

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Illustration 3	g01188316

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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 bolts (20), housing assembly (21), spring (22), poppet (23), ring (24), sleeve (25), spring (26), and poppet (27) .

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Illustration 4	g01188317

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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 plugs (28) and the O-ring seals (29) .

8. Remove plugs (36) and O-ring seals (37) .

9. Remove plugs (39) and O-ring seals (38) .

10. Remove plug (32), O-ring seal (40), spring (31), and sleeve (30) .

11. Remove plug (33), O-ring seal (34), and spool (35) from housing assembly (21) .

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Illustration 5	g01188318

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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.

12. Remove plug (41), O-ring seal (42), shims (43), spring (44), ring (45), poppet (47), sleeve (48), and O-ring seal (49) .

13. Remove plug (46) and the O-ring seal.

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Illustration 6	g01188319

14. Remove plugs (50) and the O-ring seals.

15. Remove plug (52), the O-ring seals, and the backup ring.

16. Remove check valves (51) and the O-ring seals.

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Illustration 7	g01188320

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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.

17. Remove nut (53), rod (54), O-ring seal (55), O-ring seal (57), the backup ring, and the O-ring seal from housing (56). Remove washer (58), shims (59), spring (60), spool (61), spring (62), spool (63), sleeve (64), O-ring seals (65), and sleeve (66) from housing (67) .

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Illustration 8	g01188321

18. Remove valve (68), backup ring (70), the O-ring seal, spring (69), and poppet (71) .

19. Remove plug (74), O-ring seal (73), the O-ring seal, and backup ring (72) .

20. Remove check valves (76) and O-ring seals (75) .

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Illustration 9	g01188322

21. Remove check valve (77), O-ring seals (78), and O-ring seals (79) .

22. Remove plug (80), O-ring seal (81), and valve (82) .

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Illustration 10	g01188324

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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 nut (83), valve (84), O-ring seal (85), housing (86), O-ring seal (87), nut (92), housing (88), O-ring seal (91), and O-ring seal (89) from housing (90) .

24. Remove sleeve (96), spring (97), retainer (98), O-ring seals (99), piston (95), spring (100), piston (101), O-ring seal (102), washer (94), and retainer (93) .

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Illustration 11	g01188325

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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.

25. Remove bolts (103), housing (105), plug (104), and O-ring seal (108) .

26. Remove O-ring seal (109), spring (110), piston (106), piston (111), O-ring seal (112), and spool (107) .

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Illustration 12	g01188326

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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.

27. Remove bolts (124), housing (123), and O-ring seal (122) .

28. Remove spool assembly (118), bolt (125), retainer (121), spring (120), and retainer (119) .

29. Repeat Step 27 through Step 28 for valve assembly (117), valve assembly (116), valve assembly (115), valve assembly (114), and valve assembly (113) .

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Illustration 13	g01189188

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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.

30. Remove bolts (136), cover (135), O-ring seal (134), plate (133), and O-ring seals (132) .

31. Remove spool assembly (127) .

32. Remove bolt (131), retainer (130), spring (129), and retainer (128) .

33. Repeat Steps 30 through Step 32 for valve assembly (126) .

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Illustration 14	g01189189

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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.

34. Remove bolts (148), housing (147), O-ring seal (146), guide (145), the O-ring seal, spring (144), valve (143), the O-ring seal, spool (141), poppet (140), spring (139), and bolt (138) .

35. Remove valve assembly (142) and valve assembly (137) .

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Illustration 15	g01189195

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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.

36. Remove plug (149) and O-ring seal (150) from housing (151) .

37. Remove bolts (161) and housing (151) .

38. Remove O-ring seals (153), ball (158), spring (152), shim (157), and rod (156) .

39. Remove cover (159), O-ring seals (155), backup rings (154), spring (160), piston (162), and sleeve (163) .

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Illustration 16	g01189191

40. Remove bolts (164), cover (165), and O-ring seal (166) .

41. Remove plug (167) and O-ring seal (168) .

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Illustration 17	g01189193

42. Remove bolts (173), covers (172), and O-ring seals (171) .

43. Remove plug (170) and O-ring seal (169) .

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Illustration 18	g01189194

44. Remove bolts (176), covers (175), and O-ring seals (174) .

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Illustration 19	g01189196

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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.

45. Remove bolts (177), cover (179), plug (178), plug (185), and the O-ring seal.

46. Remove O-ring seal (180), piston (181), O-ring seals (182), the backup rings, shims (183), spring (184), spring (186), piston (187), piston (188), sleeve (189), sleeve (190), pin (191), O-ring seal (192), and O-ring seal (193) .

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Illustration 20	g01189197

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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.

47. Remove plug (201), O-ring seal (200), retainer (199), spring (198), spool (197), sleeve (196), pin (195), and sleeve (194) .

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Illustration 21	g01189198

48. Remove bolts (203) .

49. Separate housing (202) from housing (204) .

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Illustration 22	g01189278

50. Remove O-ring seals (205) .