Main Hydraulic Pump

8/10/2019 Main Hydraulic Pump

1/17

Disassembly and Assembly

330B, 330B L & 330B 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

Fluid Spillage Containment

Care must be taken to ensure that the fluids are contained during performance of the inspection, themaintenance, the testing, the adjusting and the repair of the machine. Be prepared to collect the fluid withsuitable containers before opening any compartment or disassembling any component containing fluids.Refer to the "Tools And Shop Products Guide", NENG2500 for the tools and the supplies suitable to collectand contain any of the fluids in Caterpillar machines. Dispose of the fluids according to local regulations andmandates.

Shutdown SIS

Previous Screen

Product: EXCAVATOR

Model: 330B LN EXCAVATOR 5LR

Configuration: 330B L, 330B LN Excavators 5LR00001-UP (MACHINE)POWERED BY 3306 Engine

Media Number -SENR8973-02 Publication Date -01/10/2004 Date Updated -07/02/2005

SENR89730036

NOTICE

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

Page 1 of 17


2/17

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

2.Remove drain plug (1), and drain the oil from the main hydraulic pump in a suitable container for disposal.

3.Fasten the main hydraulic pump to Tooling (A) as shown.

4.Remove the four socket head bolts that hold plate (2) in position. Remove plate (2) and the O-ring sealfrom the main pump housing.

5.Remove 12 socket head bolts (3) that hold the head group in position.

6.Fasten Tooling (B) and a hoist to head group (4) as shown. Remove the head group from the mainhydraulic pump. The weight of the head group is 43 kg (95 lb).

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

8.Remove port plate (6) from each pump rotating group.

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

10.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).

Page 2 of 17


3/17

11.Remove pins (21), spools (20) and springs (19) from the housing.

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

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

14.Disassemble housing assembly (23). Remove six O-ring seals (28) and two O-ring seals (29) fromhousing (23). Remove two springs (24), two springs (25) and two spacers (26) from the housing. Remove twosheets (27) from the housing.

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

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

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

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

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

Page 3 of 17


4/17

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

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

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

22.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.

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

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

25.Remove pistons (45) from the head.

26.Remove guides (46) from the head.

Page 4 of 17


5/17

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

28.Remove cylinder (51) from each rotating group.

29.Remove spacer (52), and four bevel spring washers (53) from the center bore of each cylinder (51).

30.Remove 14 socket head screws (54) from each retaining plate (55).

31.Remove centering pin (56) and retaining plate (55) for each rotating group.

32.Remove seven pistons (57) for each rotating group.

33.Remove two rings (58) from each piston (57).

Page 5 of 17


6/17

34.Remove the main pump housing from Tooling (A) and turn it over. Refasten the main pump housing to

Tooling (A).

35.Remove four bolts (59) and pilot pump (60) from the main pump housing.

36.Remove two O-ring seals (61) from the pilot pump housing.

37.Thoroughly clean the outside of pilot pump (60).

38.Remove bearing (62) from the main pump housing. The bearing is a slip fit.

39.Use Tool (C) to remove retaining ring (63). Remove cover (64).

40.Remove lip seal (65) from cover (64).

41.Remove O-ring seal (66) from the main pump housing.

42.Install suitable size bolt (67) in the end of pump rotating group (68). Hit the end of the upper pumprotating group with a hammer to remove it from the main pump housing.

Page 6 of 17


7/17


8/17

50.Install bearing (85) in its original position in the main pump housing. The bearing is a slip fit. Install race

(84) in bearing (85).

51.Heat gear (83) to a maximum temperature of 85 C (185 F). Lower the temperature of shaft (82) 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 andthe gear has a corresponding slot. Install the upper bearing on the shaft. It is a slip fit.

NOTE: Prior to assembling the remainder of the main hydraulic pump, the Main Pump Rotating GroupAdjustment, Displacement Angle Adjustment, Bearing Preload Adjustment and Lift-Off LimitationAdjustment must be performed. Use the procedures which follows.

Main Pump Rotating Group Adjustment

Cross Section Of Pump Rotating Group (6) Port Plate. (52) Spacer. (51) Cylinder. (57) Piston. (56) Center Pin. (53) Bevel Spring

Washers (four). (68) Shaft/Gear. (71), (73) and (75) Bearings.

NOTE: Each of the two pump rotating groups are divided into two groups. The mechanical drive group

consists of shaft/gear (68) and bearing assemblies (71), (73) and (75).

8T-7773 Measuring Kit (Partial Consist) (86) 8T-7774 Support. (87) 8T-7775 Cylinder. (88) 8T-9302 Spacer. (89) 8T-7776

Centering Pin. (90) 8T-7777 Plate. (91) 6D-3027 Bolt

Cross Section Of Pump Rotating Group (52) Spacer. (56) Centering Pin. (73) and (75) Bearings. (88) 8T-9302 Spacer. (90) 8T-7777 Plate. (72) Shim. "I" Dimension needed for preload "K". "K" Preload determined by spacer (52). "J" Dimension determined

by shim (93).

NOTE: Preload "K" between spacer (52) and centering pin (56), in combination with bevel spring washers(53), maintain the correct limit of separation between cylinder (51) and port plate (6) (lift-off limitation). Thislimits leakage during heavy, transient loading of the pump. When servicing the hydraulic group, there are twocritical dimensions. Dimension "I" is determined by one of several sizes of spacer (52). Dimension "J" isdetermined by one thickness of shim.

Page 8 of 17


9/17

Displacement Angle & Bearing Preload

52.Place 8T-7774 Support (86) on a surface plate. Position gauge blocks (92) from Tooling (E) on thesupport to obtain dimension "I" of 76.00 mm (2.992 in). Position Tooling (F) over the gauge blocks, and zerothe indicator.

53.Place bearing (75), spacer (74), bearing (73) and shim (72) on 8T-7774 Support (86). Slide the bearingassembly under Tooling (F). Add shims (72) to obtain the correct dimension "J". Dimension "J" must be 0.00

and -0.05 mm (.000 and -.002 in).

Thickness of shims (72):

9T-3376 ... 2.70 mm (.106 in)

9T-3377 ... 2.80 mm (.110 in)

9T-3378 ... 2.90 mm (.114 in)

9T-3379 ... 3.00 mm (.118 in)

9T-3380 ... 3.10 mm (.122 in)

Stub Shaft Group (79), (80) and (81) Bearings. (78) Shim. (95) Shaft. (77) Bearing. (76) Spanner Nut.

NOTE: The following procedure for bearing preload applies only to new bearings with manufacturer'slubricant.

Page 9 of 17


10/17

Locally fabricated tools. (96) Bearing Support. (55) Retaining Plate. (97) Rotating Group Holding Tool.

NOTE: Rotating group holding tool (97) and bearing support (96) will be required when setting the bearingpreload of the rotating group. These tools must be fabricated.

To fabricate rotating group holding tool (97), use a 13 mm (.5 in) thick steel plate that is approximately 19mm (.75 in) wider than the outside diameter of retaining plate (55). Using retaining plate (55) as a template,transfer the outer bolt circle of the retaining plate to the steel plate, and drill the holes. Drill an additional holein the center of the steel plate, and install a bolt through the center hole. Secure the bolt with a nut. This boltwill be used to rotate the rotating group during the bearing preload adjustment. Attach rotating group holding

tool (97) to the bottom of the shaft/gear with the appropriate size bolts.

To fabricate bearing support (96), cut a 90 degree vee approximately150 mm (5.9 in)wide [dimension "H"]into a block of wood. This wood block will be used to hold the rotating group while the drive shaft is rotated.

54.Install bearing (79), spacer (80) and bearing (81) with shims (78) determined in Step 53 on shaft (95).Install bearing assembly (77). Apply 9S-3263 Thread Lock on the threads of spanner nut (76). Place therotating group holding tool (97) in a vise. Use Tool (H) to tighten spanner nut (76).

Lift-Off Limitation Adjustment (Cylinder Barrel To Port PlateMaximum Separation)

Setup Of Dial Indicator Group [Tooling (F)] (86) 8T-7774 Support. (94) Gauge Blocks

55.Position 8T-7774 Support (86) on a surface plate. Position gauge blocks (94) from Tooling (E) on thesupport to obtain dimension "I" of 127 mm (5.0 in). Position Tooling (F) over Tooling (E), and zero theindicator.

Page 10 of 17


11/17

Installing Spacer (52) Spacer. (51) Cylinder. (88) 8T-9302 Spacer [Tooling (E)]. (98) Wire. (99) Center Pin Cylinder.

56.Using a piece of wire (98), guide spacer (52) (minimum thickness) into center pin cylinder (99) ofcylinder (51). Place spacer (88) and centering pin (56) in the cylinder. Position 8T-7775 Cylinder (87) overthe 8T-7774 Support (86), and lay the cylinder on its side. Carefully install the centering pin cylinder and thecylinder into the pump cylinder, and return the unit to a vertical position. Align port plate (6) over cylinder(51). Install 8T-7777 Plate (90). Position 8T-7776 Centering Pin (89), with the two lifting bolts, over 8T-7777Plate (90).

Positioning Of Cylinder Assembly In Cylinder

Measurement For Spacer Thickness (6) Port Plate. (52) Spacer. (51) Cylinder. (56) Centering Pin. (86) 8T-7774 Support. (87) 8T-

7775 Cylinder. (88) 8T-9302 Spacer. (90) 8T-7777 Plate. (89) 8T-7776 Centering Pin. (91) 6D-3027 Bolts.

57.Slide the above assembly under Tooling (F). The dial indicator must read between +0.05 to -0.10 mm(+.002 to -.004 in). There are several different sizes of spacers (52) to choose from to obtain the correct lift-off limitation. There is a minimum spacer size. Each succeeding size of spacer is 0.10 mm (.004 in) thicker.Depending on the dial indicator reading, the correct size spacer can be selected. For example, the dialindicator has a reading of -0.50 mm (-.020 in). To obtain the 127 +0.05 -0.10 mm (5.0 +.002 -.004 in)dimension, remove the spacer with the minimum thickness. Replace it with a spacer which is 0.40 mm (.016in) thicker than the minimum. The tolerance should now be -0.10 mm (-.004 in).

Page 11 of 17


12/17

Measurement For Spacer Thickness

Installation Of Bevel Spring Washers (53) Bevel Spring Washers. (98) Wire.

58.Once the correct size spacer has been determined, the 8T-7777 Plate and the 8T-9302 Spacer can beremoved. The four bevel spring washers (53) can be installed using wire (98) as a guide.

59.Assemble both pump rotating groups for the main hydraulic pump as follows:

a.Heat bearing (81), spacer (80) and bearing (79) to a maximum temperature of 100 C (212 F). Install thebearings and the spacer on the shaft as shown.

b.Install shims (78) making sure the distance between the top of the shim pack to the bottom of the lowerbearing [dimension "X"] is 86.50 + 0.00 - 0.05 mm (3.40 + .00 - .002 in).

c.Heat bearing (77) to a maximum temperature of 100 C (212 F). Install the bearing on the shaft as shown.

d.Apply 9S-3263 Thread Lock on the threads of the shaft of the pump rotating group. Install spanner nut(76). For the correct bearing preload, turn the pump rotating group while tightening spanner nut (76). Theshaft running torque must be 1 to 2 Nm (1 to 1.4 lb ft).

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

61.Install O-ring seal (66) in the main pump housing.

62.Install lip seal (65) in cover (64). Install the lip seal with the lip so it will be facing toward the inside of

Page 12 of 17


13/17

the main pump housing and until it makes contact with the counterbore in the cover.

63.Install cover (64) in its original position in the main pump housing.

64.Use Tool (C) to install retaining ring (63) to hold cover (64) in position in the pump housing.

65.Install two O-ring seals (61) on pilot pump (60).

66.Put pilot pump (60) in position in the main pump housing. Install four bolts (59) that hold the pilot pumpin position.

67.Turn the main pump housing over.

68.Install two rings (58) on each piston (57).

69.Install 14 pistons (57) in their original locations in the pump rotating groups.

70.Install retaining plates (55) and centering pins (56) in their original positions over pistons (57). Make surethe screw holes in the retaining plates are in alignment with the screw holes in the pump rotating groups.

Page 13 of 17


14/17

71.Apply 9S-3263 Thread Lock on the threads of 14 socket head screws (54). Install the 14 socket head

screws to hold retaining plates (55) to the pump rotating groups. Tighten the socket head screws evenly.

72.Install spacer (52) and four bevel spring washers (53) in each cylinder (51). Install the bevel springwashers 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 port 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.

NOTICE

Bevel spring washers (53) are not flat. The bevel spring washers shouldbe installed so they provide the maximum amount of height.

Page 14 of 17


15/17

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 willfit only one way.

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 (38).

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

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

Page 15 of 17


16/17

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 sheets (27) in housing (23). Install two spacers (26), twosprings (25), and two springs (24) in the housing. Install two O-ring seals (29) and six O-ring seals (28) inhousing (23).

88.Put housing assembly (23) in position on the head. Slowly and evenly tighten six socket head bolts (22) tocompress 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). Install piston (12), bushing (13) and piston (14) in housing (11). Install O-ring seals (17) and (18) in housing (11).

91.Put both pump control head groups (8) in position on the housing. Install eight socket head bolts (7) that

Page 16 of 17


17/17

hold the pump control head groups in position.

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

93.Install 12 socket head bolts (3) that hold the head group to the main hydraulic pump.

94.Install the O-ring seal and plate (2) on the main pump housing. Install the four socket head bolts that holdthe plate in position.

95.Make sure drain plug (1) is tight.

End By:

a.install main hydraulic pump and pump drive coupling

Copyright 1993 - 2014 Caterpillar Inc.

All Rights Reserved.Private Network For SIS Licensees.

Tue Dec 2 12:13:50 UTC+0300 2014

Page 17 of 17

Main Hydraulic Pump

Documents

Transcript of Main Hydraulic Pump