Disassembly and Assembly 330,330 L & 330 LN EXCAVATORS MACHINE SYSTEMS

Main Hydraulic Pump

SMCS - 5070-017

Disassemble & Assemble Main Hydraulic Pump

Start By:

a. remove main hydraulic pump and pump drive coupling

NOTE: Refer to Service Magazine article SEPD0269, New Adjustment Procedure Now Used During Rebuild of Main Hydraulic Pumps for the correct adjustment procedures.

1. Thoroughly clean the outside of the main hydraulic pump prior to disassembly.

2. Remove drain plug (2), and drain the hydraulic oil from the main hydraulic pump into a suitable container.

3. Fasten main hydraulic pump (1) to tool (A) in a vertical position.

4. Remove twelve socket head bolts (3) that hold the head group in position.

Shutdown SIS

Previous Screen

Product: EXCAVATOR

Model: 330 L EXCAVATOR 5YM

Configuration: 330, 330L Excavators 5YM00001-UP (MACHINE)

Media Number -SENR5498-01 Publication Date -01/10/2004 Date Updated -19/01/2005

SENR54980031

NOTICE

During disassembly of the main hydraulic pump, mark all components so they can be reinstalled in their original locations. Mixing components will shorten the service life of the pump.

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5. Fasten tool (B) and a hoist to head group (4) as shown. Remove the head group from the main hydraulic pump. The weight of the head group is 43 kg (95 lb).

6. Remove two dowels (5) from the main pump housing.

7. Remove two control plates (6) from the main hydraulic pump.

NOTE: Steps 8 through 26 are for the disassembly of the head group.

8. Remove eight socket head bolts (7) that hold pump control head groups (8) in position. Remove the pump head groups from the housing.

9. Disassemble both pump control head groups. Remove O-ring seals (17) and (18) from housing (11). Remove piston (14), bushing (13) and piston (12) from housing (11). Remove cover (9), seats (16) and spring (10) from housing (11). Remove O-ring seal (15) from cover (9).

10. Remove pins (21), spools (20) and springs (19).

11. While retaining housing assembly (23), slowly and evenly loosen six socket head bolts (22) to release the spring force.

12. Remove housing assembly (23) from the head.

There are two compressed springs behind housing assembly (23). When six socket head bolts (22) are removed, the spring force will be released. To prevent possible personal injury, slowly and evenly loosen the socket head bolts while retaining the housing assembly.

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13. Disassemble housing assembly (23). Remove six O-ring seals (28) and two O-ring seals (29) from the housing. Remove two seats (27) from the housing.

14. Remove three plugs (30) from the housing.

15. Remove O-ring seal (31) from each plug (30).

16. Remove three bushings (32), the three valves and three seats from the housing.

17. Remove two guides (35), two springs (34) and two spacers (33).

18. Turn the head around. Remove eight socket head bolts (36) and two cover groups (37) from the head.

19. Remove O-ring seals (38) and (39) from each cover group.

20. Remove two bolts (42), and two pistons (41) from the head. Remove ring (40) from each piston.

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21. Using the appropriate size Allen wrench, loosen socket head screw (43) in each large piston in the head. The socket head screws do not have to be completely removed.

22. Mark the positions of rods (44) prior to removing them from the large pistons in the head. The rods can only fit the piston one way because of the locking setscrews.

23. Remove rods (44) from the large pistons. This will permit removal of the pistons from the head.

24. Remove pistons (45) from the head.

25. Remove guides (46) from the head.

26. Remove O-ring seals (47) and (49), packing (48) and back-up ring (50) from each guide (46).

27. Remove two cylinders (51) from the pistons in each pump rotating group.

28. Remove spacer (52) and four bevel spring washers (53) from each cylinder (51).

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29. Remove fourteen screws (54) from each retaining plate (55).

30. Remove center pistons (56) and retaining plates (55) from the main pump housing.

31. Remove pistons (57) from the main pump housing.

32. Remove ring (58) from each piston (57).

33. Remove the pump main housing from tool (A). Turn the main pump housing over as shown.

34. Remove two socket head bolts (59) and gear pump (60) from the main pump housing.

35. Remove two O-ring seals (63) and one seal (62).

36. Remove coupling (61).

37. Remove plate (64) from the main pump housing.

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38. Remove three O-ring seals (65) from plate (64).

39. Remove bearing (66) from the main pump housing. The bearing is a slip fit.

40. Using tool (D), remove retaining ring (67). Remove cover (68).

41. Remove seal (69) from cover (68).

42. Remove O-ring seal (70) from the main pump housing.

43. Install a suitable size bolt (71) in the end of pump rotating group (72). Hit the end of the upper pump rotating group to remove it from the main pump housing.

44. Remove plug (73) from the main pump housing. Install a suitable size bolt in threaded hole for plug (73). Tighten the bolt to remove the lower pump rotating group from the main pump housing.

45. Disassemble the upper pump rotating group. Remove spanner nut (74). Remove bearing (77), shims (75), bearing (78), spacer (76) and bearing (79) from the shaft.

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46. Disassemble the lower pump rotating group. Remove spanner nut (80). Remove bearing (81), shims (82), bearing (83), spacer (84) and bearing (85) from the shaft.

47. Fasten tool (E) to the shaft in the main pump housing using a suitable size bolt and washer. Use tool (E) to remove the shaft from the main pump housing.

48. Remove gear (86) from the main pump housing. Sliding the gear to the center of the housing, and remove it out the top.

49. Remove race (87) and bearing (88) from the main pump housing. The race and bearing are slip fits.

NOTE: The following steps are for the assembly of the main hydraulic pump.

50. Be sure all parts of the main hydraulic pump are thoroughly clean and free of dirt and debris. Check the condition of all O-ring seals, back-up rings, and gaskets. If any of these compartments are worn or damaged, use new parts for replacement. Put clean hydraulic oil on all parts during assembly.

51. Install bearing (88) in its original position in the main pump housing. The bearing is a slip fit. Install race (87) in bearing (88).

52. Heat gear (86) to a maximum temperature of 85°C (185°F). Lower the temperature of the shaft to -40°C (-40°F). Place the preheated gear in the main pump housing, above the bearing. Install the cooled shaft, with the attached race, through the gear and into the lower bearing. Note that the shaft has a woodruff key and the gear has a corresponding slot. Install the upper bearing on the shaft. It is a slip fit.

53. Install three O-ring seals (65) in plate (64).

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54. Install plate (64) in the main pump housing.

55. Install seal (62) and two O-ring seals (63) in the gear pump.

56. Install coupling (61) on the drive shaft of the gear pump.

57. Put gear pump (60) in position in the main pump housing. Install two socket head bolts (59) that hold it.

58. Assemble both pump rotating groups for the main hydraulic pump as in Steps 59 through 62.

59. Heat bearing (85), spacer (84) and bearing (83) to a maximum temperature of 100°C (212°F). Install the bearings and spacer on the shaft as shown.

60. Install shims (82) so the distance between the top of the shim pack to the bottom of the lower bearing [dimension (X) is 86.50 + 0.00 - 0.05 mm (3.40 + 0.00 - 0.002 in)].

61. Heat bearing (81) to a maximum temperature of 100°C (212°F). Install the bearing on the shaft as shown.

62. Put 9S3263 Thread Lock on the threads of the shaft of the pump rotating group. Install spanner nut (80). For the correct bearing preload, turn the pump rotating group while tightening spanner nut (80). The shaft running torque should be approximately 1 to 2 N·m (1 to 1.4 lb ft).

63. Lower the temperature of the upper and lower rotating groups to a temperature of -40°C (-40°F). Install the upper and lower rotating pump groups in their original locations in the main pump housing. Be sure the timing marks on each pump rotating group are in alignment with each other as shown.

64. Install O-ring seal (70) in the main pump housing.

Page 8 of 12

65. Install seal (69) in cover (68). Install the seal with the lip facing toward the inside of the pump housing and until it makes contact with the counterbore in the cover.

66. Install cover (68) in its original position in the main pump housing.

67. Using tool (D), install retaining ring (67) to hold cover (68) in position in the main pump housing.

68. Install rings (58) on seven pistons (57). Install the pistons in their original locations in the pump rotating group.

69. Install center piston (56) with retaining plate (55) in its original position over pistons (57). Be sure the screw holes in the retaining plate are in alignment with the screw holes in the pump rotating group.

70. Put 9S3263 Thread Lock on the threads of the seven screws that hold the retaining plate to the pump rotating group. Install the screws, and tighten them evenly.

71. Repeat Steps 68 through 70 for the other pump rotating group.

NOTICE

Screws (54) that hold retaining plate (55) to the pump rotating group must be tightened evenly. If the screws are not tightened correctly, pistons (57) will bind in the retaining plate.

NOTICE

Page 9 of 12

72. Install spacer (52) and four bevel spring washers (53) in each cylinder (51). Install the bevel spring washers so they provide the maximum amount of height.

73. Install two cylinders (51) in their original locations on the pump rotating groups.

74. Reinstall two dowels (5) in the main pump housing as shown.

75. Reinstall two control plates (6) in their original positions on cylinders (51).

76. Assemble both pump control head groups. Install back-up ring (50), packing (48) and O-ring seals (47) and (49) on each guide (46).

77. Install guides (46) in the head.

78. Install pistons (45) in the head.

79. Reinstall rods (44) in the large pistons in the head. Install the rods in their original positions. The rods will only fit one way.

Bevel spring washers (53) are not flat. These washers should be installed so they provide the maximum amount of height.

Page 10 of 12

80. Tighten socket head screw (43) in each large piston in the head.

81. Install a ring (40) on each piston (41). Install piston (41) and bolt (42) in each large piston.

82. Install O-ring seal (39) on each cover group (38).

83. Put two cover groups (37) in position on the head. Install eight socket head bolts (36) that hold the cover groups in position.

84. Install two spacers (33), two springs (34) and two guides (35) in the head.

85. Install the three seats, three valves and three bushings (32) in the housing.

86. Install an O-ring seal (31) on each plug (30). Install three plugs (30) in the housing.

87. Assemble housing assembly (23). Install two seats (27) in housing (23). Install two spacers (26), two springs (25), and two springs (24) in the housing. Install two O-ring seals (29) and six O-ring seals (28) in the housing (23).

Page 11 of 12

88. Put housing assembly (23) in position on the head. Slowly and evenly tighten six socket head bolts (22) to compress the springs in the housing assembly.

89. Install two springs (19), two spools (20) and two pins (21) in the housing assembly.

90. Assemble both pump control head groups. Install O-ring seal (15) on cover (9). Install spring (10), seats (16) and cover (9) in housing (11).

91. Put both pump control head groups in position on the housing. Install eight socket head bolts (7) that hold the pump control head groups in position.

92. Fasten tool (B) and a hoist to head group (4) as shown. Put the head group in position on the main hydraulic pump.

93. Install twelve socket head bolts that hold the head group to the main hydraulic pump.

94. Be sure drain plug (2) is tight.

End By:

a. install main hydraulic pump and pump drive coupling

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