This document provides assembly instructions for a piston pump in 3 sentences:
The instructions describe assembling the various components of the piston pump in 29 steps, including installing seals, bearings, pins, springs and other parts, and checking the bearing end play is within the specified range. Tools required are listed and safety warnings are provided where parts are under high spring pressure. Photographs illustrate each step in the assembly process.
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Product: BACKHOE LOADER
Model: 450E BACKHOE LOADER RBA
Configuration: 450E Backhoe Loader RBA00001-UP (MACHINE) POWERED BY C4.4 Engine
Disassembly and Assembly
450E Backhoe Loader Machine Systems
Media Number -UENR0271-02 Publication Date -01/04/2017 Date Updated -25/04/2017
i04415306
Piston Pump - Assemble
SMCS - 5070-016; 5455
Assembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
B 1P-0510 Driver Group 1
C 1P-1858 Retaining Ring Pliers 1
F 1P-1861 Retaining Ring Pliers 1
G 5P-0320 Seal Guide 1
H 1U-6396 O-Ring Assembly Compound 1
J 8T-5096 Dial Indicator Group 1
K 5P-1666 Camshaft Bearing Puller Plate 1
L 9U-5719 Heat Shrink Tubing 1
Note: If a failure occurs, an accurate diagnosis of the cause can prevent a recurrence. Information
is available to analyze failures for piston pumps and motors. Refer to Special Publication,
SEBD0641, "Analyzing Axial Piston Pump and Motor Failures".
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3. Illustration 1 g00724141
1. Install the seal on plug (89) . Install plug (89) . Tighten plug (89) to a torque of 105 ± 10
N·m (75 ± 10 lb ft).
Illustration 2 g00724317
Note: The gap in retaining ring (87) must be over the weep hole that is marked.
2. Use Tooling (F) in order to install retaining ring (87) .
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4. Illustration 3 g02133080
Illustration 4 g00724319
Note: Lubricate the sealing lip of seal (88) with clean hydraulic oil.
3. Use Tooling (B) in order to install seal (88) .
Illustration 5 g02133079
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5. Illustration 6 g00724321
Note: Lubricate the sealing lip of seal (86) with clean hydraulic oil.
4. Use Tooling (B) in order to install seal (86) .
5. Install bearing cup (85) .
Illustration 7 g00724326
Illustration 8 g00724474
Note: If necessary, lower the temperature of bearing cup (85) .
6. Use Tooling (B) in order to seat bearing cup (85) .
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6. Illustration 9 g00724483
7. Use a suitable press and Tooling (G) in order to install shaft (83) into bearing cone (84) .
Illustration 10 g01246171
8. Install Tooling (L) over the splined end of shaft assembly (83) .
Illustration 11 g00724114
9. Install shaft assembly (83) .
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7. Illustration 12 g00724495
Illustration 13 g00724496
Note: If necessary, lower the temperature of bearing cup (66) .
10. Use Tooling (B) in order to seat bearing cup (66) .
11. The following Steps are necessary to determine the correct bearing end play:
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8. Illustration 14 g00724499
a. Place bearing cone (68) on shaft assembly (83) , as shown.
Illustration 15 g00723958
Note: Head assembly (56) must be installed to the position that was marked in the
disassembly procedure.
b. Use four bolts (55) in order to install head assembly (56) . The torque for bolts (55) is
165 ± 30 N·m (120 ± 20 lb ft).
Illustration 16 g01246173
c. Remove Tooling (L) .
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9. Illustration 17 g01246176
d. Use a 5/16x2.5 bolt in order to install Tooling (K) on shaft (83) , as shown.
Illustration 18 g01246214
e. Place Tooling (J) on the pump, as shown. Shaft assembly (83) must be seated. Set
Tooling (J) to zero. Use a pry bar to pull up on Tooling (K) and record the reading on
Tooling (J) . Add 0.000 mm (0.0000 inch) to 0.050 mm (0.0020 inch) to this reading.
f. Remove Tooling (J) and (K) .
Illustration 19 g00723958
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10. g. Remove bolts (55) and head assembly (56) .
Illustration 20 g00724499
h. Remove bearing cone (68) from shaft assembly (83) .
Illustration 21 g00724105
12. Install bearing races (81) and (82) .
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11. Illustration 22 g00724104
13. Use bolt (79) in order to install carrier (80) .
Illustration 23 g00724103
14. Install swashplate assembly (78) .
Illustration 24 g00724099
Note: Use a small amount of petroleum jelly to hold three pins (77) in place during
installation.
15. Install pins (77) .
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12. Illustration 25 g00724098
16. Install spring (76) and seat (75) .
Illustration 26 g00723984
Personal injury can result from parts under high spring pressure.
Spring force can cause parts to come off suddenly. Contact your
Caterpillar dealer for disassembly instructions before removing any
parts.
17. Use a suitable press and Tooling (B) in order to compress the spring. Use Tooling (C) in
order to install retaining ring (74) .
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14. 20. Wrap a piece of nylon string around the pistons of rotating group (70) , as shown.
Illustration 30 g00724624
21. Use the nylon string to hold rotating group (70) together during installation. Remove the
nylon string.
Illustration 31 g00724625
Note: Spacer (69) must be ground to the dimension that was determined in Step 11.e. The
faces of spacer (69) must be parallel within 0.050 mm (0.0020 inch).
22. Install spacer (69) .
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16. Illustration 34 g00723966
25. Install cylinder (63) and guide (64) .
Illustration 35 g00723965
Note: Lubricate plunger (61) with clean hydraulic oil. Plunger (61) must slide easily in
cylinder (63) .
26. Install spring (62) and plunger (61) .
Illustration 36 g00723964
Note: Lubricate piston (59) with clean hydraulic oil. Piston (59) must slide easily on guide
(64) .
27. Install spacer (60) and piston (59) .
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18. Illustration 37 g00723962
Note: Lubricate O-rings (57) with Tooling (H) . Lubricate port plate (58) with clean
hydraulic oil. Apply a small amount of petroleum jelly to the back side of port plate (58) to
aid in installation.
28. Install O-ring seals (57) and port plate (58) .
Illustration 38 g00723958
Note: Head assembly (56) must be installed to the position that was marked in the
disassembly procedure.
29. Carefully install head assembly (56) . Install four bolts (55) . The torque for bolts (55) is
165 ± 30 N·m (120 ± 20 lb ft).
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19. Illustration 39 g00723956
30. Use bolt (53) in order to install carrier (52) . Install pin (54) .
Illustration 40 g00723903
31. Assemble power compensator valve (34) , as follows:
Illustration 41 g00723905
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20. 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.
a. Install stem (45) , piston (44) , retainer (43) , and spring (42) . Install O-ring seal (41)
on plug (40) . Install plug (40) .
b. Install retainer (46) , spring (47) , and O-ring seal (48) . Install plug (50) in adjuster
(49) . Install adjuster (49) and nut (51) .
Illustration 42 g00723902
32. Install O-ring seal (38) and cap (39) .
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