Assembly Procedure
Table 1
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UENR3252
Required Tools
Tool Part Number Part Description
B
1P-2420
© 2025 Caterpillar Inc.
Transmission Repair Stand
C
D
E
H
138-7575
1P-0510
1U-8605
Link Bracket
Driver Group
Seal Guide
1P-1859
1U-6396
Retaining Ring Pliers
Qty
1
3
1
1
1
O-Ring Assembly Compound 1
Illustration 1
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1. Install gasket (107) onto pump housing (72).
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SIS 2.0
Illustration 2
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2. Install cover (106) and bolts (105) onto pump housing (72).
Illustration 3
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3. Install guide pins (104) onto pump housing (72).
Illustration 4
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4. Install bearings (103) onto pump housing (72).
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SIS 2.0
Illustration 5
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5. Install bearing (102) into swashplate (97).
Illustration 6
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6. Install dowel pins (101) into swashplate (97).
Illustration 7
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SIS 2.0
7. Install bearings (100) onto swashplate assembly (97).
Illustration 8
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8. Install plate (99) onto swashplate assembly (97).
9. Repeat Step 5 through Step 8 for swashplate assembly (98).
Illustration 9
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10. Install swashplate assemblies (97) and (98) into pump housing (72).
Note: The swashplate assemblies must be installed in the original position during assembly.
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SIS 2.0
Illustration 10
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11. Install retaining ring (90) onto shaft assembly (91).
Illustration 11
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12. Raise the temperature of bearing (95) and bearing (93). Install bearing (95) and bearing (93)
onto shaft assembly (91).
Illustration 12
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SIS 2.0
13. Install ring (94) onto shaft assembly (91).
14. Repeat Step 11 through Step 13 for shaft assembly (92).
Illustration 13
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Illustration 14
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15. Lower the temperature of the shaft assemblies. Install shaft assemblies (91) and (92) into pump
housing (72).
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SIS 2.0
Illustration 15
Note: The pump has been removed from Tooling (B) for photographic purposes only.
16. Use Tooling (E) to install retaining rings (90).
Illustration 16
17. Install springs (89) into barrel (84).
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Illustration 17
18. Install retainer (88) onto barrel (84).
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SIS 2.0
Illustration 18
19. Install cap (87) onto barrel (84).
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Illustration 19
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20. Install pistons (85) into piston plate (86).
Illustration 20
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21. Install piston assembly (83) into barrel (84).
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PSP-00074FC7
2025/12/08
SIS 2.0
22. Repeat Step 17 through Step 21 for the remaining barrel assembly.
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UENR3252
© 2025 Caterpillar Inc.
Illustration 21
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23. Install barrel assemblies (81) and (82) into pump housing (72).
Note: It may be necessary to use string to aid in the removal procedure. The barrel assemblies
must be installed in the original position during assembly.
Illustration 22
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24. Install O-ring seal (80) onto covers (78).
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SIS 2.0
Illustration 23
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25. Install covers (78), bolts (77), and plugs (79) onto pump housing (72).
Illustration 24
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26. Install O-ring seals (76) into pump housing (72).
Illustration 25
27. Install plug (76) into covers (75).
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SIS 2.0
Illustration 26
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28. Install covers (75), bolts (74), and plugs (73) onto pump housing (72).
Illustration 27
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29. Install O-ring seals (68) and (69) onto pump housing (72). Install port plates (70) and (71).
Note: The port plates must be installed in the original position during assembly.
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SIS 2.0
Illustration 28
30. Install orifices (67) into head (58).
Illustration 29
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31. Install plugs (65) and (66) into head (58).
Illustration 30
32. Install bearings (64) into the head.
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SIS 2.0
Illustration 31
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33. Install O-ring seal (63) into covers (61).
Illustration 32
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34. Install nipples (62), covers (61) and bolts (60) onto head (58). Install caps (59) onto nipples
(62).
Illustration 33
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SIS 2.0
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. Attach Tooling (C) and a suitable lifting device to head (10). Install head (58), bolts (56), and
bolts (57). The weight of head (58) is approximately 41 kg (90 lb).
Illustration 34
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36. Install O-ring seal (54) and lip seal (55) onto the seal assembly.
Illustration 35
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SIS 2.0
37. Install shrink wrap on the shaft. This will protect the seal during the installation procedure.
Install the gasket and bell housing (53). Install bolts (51).
Illustration 36
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38. Use Tooling (D) to install seal assembly (52).
Illustration 37
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39. Install plugs (49). Install three plugs (50) into the pump control.
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SIS 2.0
Illustration 38
40. Install slide plate (47) and dowel (48) onto the control linkage.
Illustration 39
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41. Install control linkage (46) and sleeve (45) into the pump control.
Illustration 40
42. Install O-ring seal (44) onto the pin.
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SIS 2.0
Illustration 41
43. Install pin (43) into the pump control.
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Illustration 42
g00882608
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.
44. Install shims (38), spool (39), spring (40), spring (41), and control piston (42) into the pump
control.
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SIS 2.0
PSP-00074FC7
2025/12/08
15:50:45+05:45
UENR3252
Illustration 43
© 2025 Caterpillar Inc.
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45. Install O-ring seal (37) onto the cover.
Illustration 44
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46. Install cover (36) onto the pump control. Install bolts (35).
Illustration 45
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47. Install pilot piston (34) into the pump control.
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SIS 2.0
Illustration 46
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48. Install ball (33) into the guide. Install guide (32) into the pump control. Install spring (31) and
spring (30) into the pump control.
Illustration 47
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49. Install O-ring seal (26) onto the adjuster. Install adjuster (24). Install setscrew (22). Install nut
(23) and nut (25). Install O-ring seal (27) onto the retainer. Install retainer (29). Install O-ring
seal (28).
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SIS 2.0
Illustration 48
g00706249
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.
50. Install cover assembly (21) into the pump control. Install bolts (20).
Illustration 49
51. Install dowel pin (19) into the pin.
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SIS 2.0
Illustration 50
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52. Place the pump control in a soft jawed vise. Support pin assembly (17). Install pin assembly
(17) into the pump control. Install piston (18) into the pump control.
Illustration 51
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53. Install O-ring seal (15) and backup ring (16) onto the stopper.
Illustration 52
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SIS 2.0
54. Install stopper (14) into the pump control.
Illustration 53
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55. Install screw (13). Install bolts (11). Install cover (12) into the pump control.
Illustration 54
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56. Install nut (10) onto the pump control.
57. Repeat Step 53 through Step 56 for the other side of the pump control.
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SIS 2.0
Illustration 55
Right Pump Only
58. Install O-ring seal (6), O-ring seal (7), O-ring seal (8), and O-ring seal (9) onto the proportional
reducing valve.
Illustration 56
Right Pump Only
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59. Install proportional reducing valve (5) onto pump control (1). Install bolts (4).
Illustration 57
60. Install pump control (1).
61. Install bolts (2) and fitting (3).
End By:
g01200312
a. Install the main hydraulic pump. Refer to Disassembly and Assembly, “Main Hydraulic Pump
Install”.
