303.5D CR, 304D CR, 305D CR and 305.5D CR Mini Hydraulic Excavators Machine Systems Main Control Valve - Disassemble Caterpillar

Disassembly Procedure

Start By:

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

Note: Cleanliness is an important factor. Before the disassembly procedure, thoroughly clean the exterior of the component in order to prevent dirt from entering the internal mechanism.mechanism.

Note: Put identification marks on all of the components of the main control valve as the components are being removed. All of the parts must be reinstalled in the original location. Do not damage any of the internal parts during the removal. Keep all of the internal parts of the valve clean and lubricated.

Show/hide table



Illustration 1	g01223390

1. Remove tube assembly (1) from the valve bank.

Show/hide table



Illustration 2	g01223392

Show/hide table

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.

2. Remove nuts (2). Remove outlet control valve (3) from the valve bank.

Show/hide table



Illustration 3	g01223489

3. Remove the following items from outlet control valve (3) : fitting (4), pressure switch (5), fitting (6), fitting (7) and fitting (8) .

Show/hide table



Illustration 4	g01223498

4. Remove the following items from the next control valve: O-ring seal (10), O-ring seal (11), springs (12), pistons (13) and O-ring seal (14) .

5. Remove boom swing control valve (9) from the valve bank.

Show/hide table



Illustration 5	g01223514

Show/hide table

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) and cap (21) from the control valve.

7. Remove the following items from the control valve: O-ring seal (19), spring retainer (18), spring (17) and washer (16) .

8. Remove spool (15) from the control valve.

9. Repeat Step 6 and repeat Step 7 for the opposite side.

Show/hide table



Illustration 6	g01223535

10. Remove adjuster (22) and O-ring seal (23) from boom swing control valve (9) .

Show/hide table



Illustration 7	g01223583

Show/hide table

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.

11. Remove the following items from the control valve: cap (29), O-ring seal (28), spring (27), poppet (24), O-ring seal (26) and backup ring (25) .

Show/hide table



Illustration 8	g01223610

Show/hide table

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 bolts (30) and flange (31) from the control valve.

Show/hide table



Illustration 9	g01224420

13. Remove O-ring seal (32) and spring (34). Remove piston (33) .

Show/hide table



Illustration 10	g01223561

Show/hide table

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. Repeat Step 4 for swing control valve (36). Remove plate (35) from swing control valve (36) .

15. Remove swing control valve (36) from the valve bank.

16. Repeat Step 6 through Step 9 for swing control valve (36) .

17. Repeat Steps 12 and 13 for swing control valve (36) .

Show/hide table



Illustration 11	g01223566

Show/hide table

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.

18. Repeat Step 4 for stick control valve (38). Remove plate (37) from stick control valve (38) .

19. Remove stick control valve (38) from the valve bank.

20. Repeat Step 6 through Step 9 for stick control valve (38) .

Show/hide table



Illustration 12	g01223654

21. Remove check valve (39) and check valve (40) from stick control valve (38) .

22. Repeat Steps 12 and 13 for stick control valve (38) .

Show/hide table



Illustration 13	g01223814

Show/hide table

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. Repeat Step 4 for bucket control valve (42). Remove plate (41) from bucket control valve (42) .

24. Remove bucket control valve (42) from the valve bank.

25. Repeat Step 6 through Step 9 for bucket control valve (42) .

Show/hide table



Illustration 14	g01223839

26. Remove check valve (43) and check valve (44) from bucket control valve (42) .

27. Repeat Steps 12 and 13 for bucket control valve (42) .

Show/hide table



Illustration 15	g01223929

Show/hide table

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.

28. Repeat Step 4 for work tool control valve (46). Remove plate (45) from work tool control valve (46) .

29. Remove work tool control valve (46) from the valve bank.

30. Repeat Step 6 through Step 9 for work tool control valve (46) .

31. Repeat Steps 12 and 13 for work tool control valve (46) .

Show/hide table



Illustration 16	g01223988

Show/hide table

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.

32. Repeat Step 4 for boom control valve (48). Remove plate (47) from boom control valve (48) .

33. Remove boom control valve (48) from the valve bank.

Show/hide table



Illustration 17	g01224028

Show/hide table

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 the following items from boom control valve (48) : bolts (54), cap (55), O-ring seal (53), spring retainer (52), spring (51), washer (50) and spool (49).

Show/hide table



Illustration 18	g01224337

Show/hide table

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.

35. Remove the following items from boom control valve (48) : bolts (56), housing (57), O-ring seal (58), O-ring seal (59), O-ring seal (60), spring retainer (61), spring (62) and washer (63) .

Show/hide table



Illustration 19	g01224354

36. Remove check valve (64) from housing (57) .

Show/hide table



Illustration 20	g01224379

37. Remove check valve (65) and check valve (66) from boom control valve (48) .

38. Repeat Steps 12 and 13 for boom control valve (48) .

Show/hide table



Illustration 21	g01224411

Show/hide table

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.

39. Repeat Step 4 for blade control valve (68). Remove plate (67) from blade control valve (68) .

40. Remove blade control valve (68) from the valve bank.

41. Repeat Step 6 through Step 9 for blade control valve (68) .

42. Repeat Steps 12 and 13 for blade control valve (68) .

Show/hide table



Illustration 22	g01225223

Show/hide table

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.

43. Repeat Step 4 for travel control valve (70). Remove plate (69) from travel control valve (70) .

44. Remove travel control valve (70) from the valve bank.

45. Repeat Step 6 through Step 9 for travel control valve (70) .

46. Repeat Steps 12 and 13 for travel control valve (70) .

Show/hide table



Illustration 23	g01225226

Show/hide table

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. Repeat Step 4 for travel control valve (72). Remove plate (71) from travel control valve (72) .

48. Remove travel control valve (72) from the valve bank.

49. Repeat Step 6 through Step 9 for travel control valve (72) .

50. Repeat Steps 12 and 13 for travel control valve (72) .

Show/hide table



Illustration 24	g01225230

51. Remove rods (74) from inlet control valve (73) .

Show/hide table



Illustration 25	g01225240

52. Remove O-ring seal (75) and O-ring seal (76) from inlet control valve (73). Remove O-ring seal (77) from inlet control valve (73) .

53. Remove plug (78) and the O-ring seal from inlet control valve (73) .

54. Remove check valve (79) and check valve (80) from inlet control valve (73) .