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Product: BACKHOE LOADER
Model: 450E BACKHOE LOADER LYR
Configuration: 450E Backhoe Loader LYR00001-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
i02485140
Piston Pump - Disassemble
SMCS - 5070-015; 5455
Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-0074 Slide Hammer Puller 1
B 1P-0510 Driver Group 1
C 1P-1858 Retaining Ring Pliers 1
D 8H-0663 Bearing Puller Assembly 1
E 166-7441 Valve Seat Extractor Tool 1
F 1P-1861 Retaining Ring Pliers 1
Start By:
a. Remove the piston pump. Refer to Disassembly and Assembly, "Piston Pump - Remove".
NOTICE
Care must be taken to ensure that fluids are contained during
performance of inspection, maintenance, testing, adjusting, and repair
of the product. Be prepared to collect the fluid with suitable containers
before opening any compartment or disassembling any component
containing fluids.
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3. Refer to Special Publication, NENG2500, "Dealer Service Tool
Catalog" for tools and supplies suitable to collect and contain fluids on
Cat products.
Dispose of all fluids according to local regulations and mandates.
Note: Cleanliness is an important factor. Before the disassembly procedure, the exterior of the
component should be thoroughly cleaned. This will help to prevent dirt from entering the internal
mechanism.
Illustration 1 g01240851
1. Remove solenoid assembly (1A) and tube assembly (1B).
Illustration 2 g00723093
2. Remove tube assembly (3). Remove bolts (1) and pressure and flow compensator valve (2).
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4. Illustration 3 g00723096
Note: Mark the position of valve (5) for assembly purposes.
3. Remove O-ring seals (4) and valve (5).
Illustration 4 g00723097
4. Remove orifice (6).
Illustration 5 g00723098
5. Remove adapter assembly (7) and connector (8). Remove the seals from adapter assembly
(7) and connector (8).
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5. Illustration 6 g00723099
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.
Note: Record Dimension (X) and Dimension (Y) for assembly purposes. The dimension is
from the top of the nuts to the top of the screws.
6. Remove valve assembly (9).
Illustration 7 g00723100
7. Remove nut (17), plug (16), screw (15), and seat (14). Remove springs (13) and (12).
Remove retainer (11) and stem (10). Remove seal (18) and seal (19).
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6. Illustration 8 g00723895
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.
8. Remove valve assembly (20).
Illustration 9 g00723897
9. Remove nut (28), plug (27), screw (26), and seat (25). Remove springs (24) and (23).
Remove retainer (22) and stem (21). Remove seal (29) and seal (30).
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7. Illustration 10 g00723899
10. Remove plugs (31) and (32). Remove the seals from plugs (31) and (32).
Illustration 11 g00723900
11. Remove bolts (33) and power compensator valve (34).
Illustration 12 g00723901
12. Remove plug (35), O-ring seal (36), and fitting (37).
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8. Illustration 13 g00723902
13. Remove O-ring seal (38) and cap (39).
Illustration 14 g00723903
14. Use Steps 15 and 16 in order to disassemble power compensator valve (34).
Illustration 15 g00723905
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9. 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.
15. Remove nut (51) and adjuster (49). Remove plug (50) from adjuster (49). Remove O-ring
seal (48), spring (47), and retainer (46).
16. Remove plug (40). Remove O-ring seal (41) from plug (40). Remove spring (42), retainer
(43), piston (44), and stem (45).
Illustration 16 g00723956
17. Remove bolt (53), carrier (52), and pin (54).
Illustration 17 g00723958
Personal injury can result from parts under high spring pressure.
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10. Spring force can cause parts to come off suddenly. Contact your
Caterpillar dealer for disassembly instructions before removing any
parts.
Note: Mark the position of head assembly (56) to aid in installation.
18. Remove bolts (55) and head assembly (56).
Illustration 18 g00723962
19. Remove O-ring seal (57) and port plate (58).
Illustration 19 g00723964
20. Remove piston (59) and spacer (60).
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11. Illustration 20 g00723965
21. Remove plunger (61) and spring (62).
Illustration 21 g00723966
22. Remove cylinder (63) and guide (64).
Illustration 22 g00723970
23. Remove pin (65).
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12. Illustration 23 g00723971
24. Use Tooling (A) in order to remove bearing cup (66).
Illustration 24 g00723975
25. Remove O-ring seal (67) and bearing cone (68).
Illustration 25 g00723976
26. Remove spacer (69).
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14. Illustration 29 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.
30. Use a suitable press and Tooling (B) in order to compress the spring. Use Tooling (C) in
order to remove retaining ring (74).
Illustration 30 g00724098
31. Remove spring (76) and seat (75).
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17. Illustration 34 g00724105
35. Remove bearing races (81) and (82).
Illustration 35 g00724114
36. Remove shaft assembly (83).
Illustration 36 g00724115
37. Use a suitable press and Tooling (D) in order to remove bearing cone (84) from shaft (83).
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18. Illustration 37 g00724116
38. Use Tooling (E) in order to remove bearing cup (85).
Illustration 38 g00724117
39. Remove seal (86).
Illustration 39 g00724138
40. Use Tooling (F) in order to remove retaining ring (87).
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