988K XE Wheel Loader Machine Systems Caterpillar

Disassembly Procedure

Start By:

1. Remove the piston pump (Hydraulic Fan).

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Illustration 1	g06261363

1. Remove bolts (1), compensator valve (2), gasket (3), and the O-ring seals.
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   Illustration 2	g06261365

2. Remove nut (5) and solenoid (4) from compensator valve (2).
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   Illustration 3	g06261366

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   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.

3. Remove bolts (7) and port block (8) from pump housing (6).
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   Illustration 4	g03440139

4. Remove O-ring seal (9) and port plate (10) from port block (8).
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   Illustration 5	g03440156

5. Remove bearing cone (11) from shaft (12). Remove O-ring seals (13).
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   Illustration 6	g03440157

6. Remove shim (14) for the bearing preload from shaft (11).
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   Illustration 7	g03440161

7. Remove rotating group (15) from pump housing (6). Carefully retain rotating assembly (15) in housing (6). Turn the rotating assembly upside-down. Slowly lift housing (6) off rotating group (15).
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   Illustration 8	g03440240

8. Remove plate (16) and pistons (17) from barrel (18).
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   Illustration 9	g03440242

9. Remove retaining ball (19).
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   Illustration 10	g03440244

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   Illustration 11	g03440278

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   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.

10. Use Tooling (A) and a suitable press to compress spring (21) until the retaining ring (20) can be removed from barrel (18). Slowly release the pressure on the suitable press because of the spring pressure. Remove barrel (18) from the press. Remove spring (21), retaining disc (22), and pressure pins (23).
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    Illustration 12	g03440379

11. Remove plug (24) and the O-ring seal.
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    Illustration 13	g03440380

12. Remove piston (25) from pump housing (6).
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    Illustration 14	g03440381

    Note: The rod is engaged in the socket by the edges of the socket. Extreme care must be used to disengage the rod from the socket. Remove the actuator rod out of the smooth shaped socket.

13. Angle the swashplate (26) so rod (27) extends out of the bore. Remove rod (27) from the socket in swashplate (26).
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    Illustration 15	g03440385

14. Remove swashplate (26) from pump housing (6). Check the condition of socket (28).
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    Illustration 16	g03440389

15. Remove spring (31).

16. Remove screws (29) and bearings (30).
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    Illustration 17	g03440416

17. Lift shaft (11) out of pump housing (6). If necessary, press bearing cone (30) off shaft (11).
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    Illustration 18	g03440457

18. Remove retaining ring (32) from pump housing (6).
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    Illustration 19	g03440473

19. Remove seal (33) from pump housing (6). Remove O-ring seal (34).