422F, 428F, 432F, 434F and 444F Backhoe Loaders Machine Systems Caterpillar

Disassembly Procedure

Start By:

1. Remove the piston pump (main hydraulic).

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Illustration 1	g06141568

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Sudden release of spring force can cause injury. To prevent the possibility of injury, follow the procedure to relieve the spring pressure.

1. Secure the piston pump to Tooling (A) or a suitable fixture.

2. Remove nut (2) and the O-ring seal, solenoid (3), and valve (4) from main pump housing (6).

3. Remove bolts (5) and compensator valve (1) from main pump housing (6).
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   Illustration 2	g06141600

4. Remove actuator piston (7), spring guide (8), spring (9), spool (10), and O-ring seals (11) from valve (4).
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   Illustration 3	g06141787

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   Sudden release of spring force can cause injury. To prevent the possibility of injury, follow the procedure to relieve the spring pressure.

5. Remove gasket (12) from compensator valve (1).

6. Remove plug (18), O-ring seal (17), spring (16), spring (15), guide (14), and spool (13) from compensator valve (1).

7. Remove plug (24), O-ring seal (23), spring (22), spring (21), guide (20), and spool (19) from compensator valve (1).
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   Illustration 4	g06141800

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   Sudden release of spring force can cause injury. To prevent the possibility of injury, follow the procedure to relieve the spring pressure.

8. Remove cover (27) and the O-ring seal. Remove adjustment screw (28) and the O-ring seal. Remove bolts (25) and head assembly (26).
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   Illustration 5	g06141813

9. Remove O-ring seal (29) and port plate (31) from head assembly (26).

10. Remove bearing cup (30) from head assembly (26).
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    Illustration 6	g06141820

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    Illustration 7	g06142001

11. Remove bearing cone (31), O-ring seals (32) and shim (33) .

12. Use Tooling (A) to rotate main pump housing (6) to a horizontal position. Remove rotary group (34).
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    Illustration 8	g06141940

13. Remove swashplate (35) from main pump housing (6).
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    Illustration 9	g06141943

14. Remove shaft assembly (36) and spring (37).
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    Illustration 10	g06141945

15. Use Tooling (B) and a suitable press to remove bearing cone (38) from shaft assembly (36).
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    Illustration 11	g06141984

16. Remove screws (39) and bearings (40). Remove bearing cup (41).
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    Illustration 12	g06141995

17. Remove retaining ring (42) and shaft seal (43) from main pump housing (6).