PL83 and PL87 Pipelayers Machine Systems Caterpillar

Disassembly Procedure

Start By:

1. Remove the piston pump.

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Illustration 1	g03726663

1. Remove bolts (1) and adapter (2) from the head assembly.

2. Remove tubes (3) .

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Illustration 2	g03727096

3. Remove O-ring seal (3) from adapter (2) .

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Illustration 3	g03727099

4. Remove coupling assembly (5) and O-ring seal (6) .

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Illustration 4	g03727101

Note: Mark the orientation for installation purposes.

5. Remove housing assembly (7) .

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Illustration 5	g03727105

6. Remove plate (8), retainers (9), and O-ring seal (10) .

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Illustration 6	g03727111

7. Remove bolts (11) and head (12) .

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Illustration 7	g03727126

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Illustration 8	g03727131

8. Remove O-ring seals (13) and port plate (14). Remove locating pins (15) and bearing (16) .

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Illustration 9	g03428805

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Illustration 10	g03428835

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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.

9. Remove plug (17), relief valve assembly (18), and spring (19) .

10. Remove O-ring seal (20) and backup ring (21) from plug (17) .

11. Repeat Steps 9 and 10 for the opposite side.

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Illustration 11	g03431722

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Illustration 12	g03431724

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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 (22) and the O-ring seal from head assembly (6) .

13. Remove adapter (31) and the O-ring seal from head assembly (6) .

14. Remove the following items from the head assembly: spring collar (30), spring (29), spring collar (28), control piston (27), piston (26), valve bushing (25), valve piston (24), poppet seat (23) and the O-ring seal.

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Illustration 13	g03727155

15. Remove bolts (32) and valve group (33) .

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Illustration 14	g03727161

16. Remove gasket (34) .

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Illustration 15	g03727192

17. Remove adapters (35) and the O-ring seals.

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Illustration 16	g03727197

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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.

18. Remove plug (36), spring (38), retainers (39), and spool (40) .

19. Remove O-ring seal (37) from plug (36) .

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Illustration 17	g03727233

20. Remove caps (42) and (44). Remove the O-ring seals and coil assemblies (41) and (43) .

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Illustration 18	g03727452

21. Remove cartridge assemblies (46) and (47). Remove spool assembly (45) .

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Illustration 19	g03432608

22. Remove O-ring seal (48) and remove rotating group (49) .

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Illustration 20	g03432610

23. Remove pistons (50) and remove retainer plate (51) from the rotating group. Remove retainer (52) from the rotating group.

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Illustration 21	g03432612

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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.

24. Use Tooling (A) and a suitable press in order to apply slight compression to the spring. Remove retaining ring (53) .

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Illustration 22	g03432613

25. Remove the following items from barrel assembly (56) : retaining ring (53), spring (54), washer (55) and pins (57) .

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Illustration 23	g03432617

26. Remove swashplate assembly (58) .

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Illustration 24	g03432619

27. Remove block (59) and remove pin (60) from swashplate assembly (58). Remove bearing (61). Remove pin (63) and remove bearing (62) from swashplate assembly (58) .

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Illustration 25	g03432622

28. Remove bearing races (64) .

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Illustration 26	g03432624

29. Remove retaining ring (65) .

30. Use Tooling (B) in order to remove lip seal (66) .

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Illustration 27	g03432627

31. Remove retaining ring (67) .

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Illustration 28	g03432629

32. Remove shaft (68) .

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Illustration 29	g03432631

33. Remove retaining ring (69) from shaft (68). Remove bearing (70) from shaft (68) .

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Illustration 30	g03432639

34. Remove bolts (71). Remove cover (72) and the piston assembly (not shown).

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Illustration 31	g03428671

Note: Measure the distance and record the distance from the end of piston assembly (73) to nut (74) for assembly purposes.

35. Remove nut (74) and remove piston assembly (73) from cover (72) .

36. Remove O-ring seal (75) (not shown) from cover (72) .

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Illustration 32	g03432982

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Personal injury can result from parts and/or covers under spring pressure. Spring force will be released when covers are removed. Be prepared to hold spring loaded covers as the bolts are loosened.

37. Use a suitable press in order to remove retaining ring (76) .

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Illustration 33	g03432990

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Personal injury can result from parts and/or covers under spring pressure. Spring force will be released when covers are removed. Be prepared to hold spring loaded covers as the bolts are loosened.

38. Use Tooling (C) and a suitable press in order to remove ring assembly (77) .

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Illustration 34	g03433235

39. Remove spring retainer (78). Remove springs (79), (80), and (81). Remove spring retainer (82) .

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Illustration 35	g03433243

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Personal injury can result from parts and/or covers under spring pressure. Spring force will be released when covers are removed. Be prepared to hold spring loaded covers as the bolts are loosened.

40. Use a suitable press in order to remove retaining ring (83) .

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Illustration 36	g03433245

41. Remove O-ring seal (84) and ring assembly (85). Remove spring retainer (86). Remove springs (87), (88), and (90). Remove spring retainer (89) and rod (91) .

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Illustration 37	g03432662

42. Remove two guide rings (92) and remove two seal rings (93) from the housing.

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Illustration 38	g03432665

43. Remove plug assembly (95) and remove pin retainer (94) from the housing.