926M, 930M and 938M Wheel Loaders Power Train Piston Motor (Hydrostatic) - Disassemble - Rear Hydrostatic Piston Motor Caterpillar


Piston Motor (Hydrostatic) - Disassemble - Rear Hydrostatic Piston Motor
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1.1. Disassembly Procedure

Disassembly Procedure

Start By:

  1. Remove the hydrostatic drive motor.


    Illustration 1g06043361


    Illustration 2g06043362

    ------ WARNING! ------

    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.


  1. Remove bolts (1), control housing (2), spring guide (4), spring (3), and gasket (5).


    Illustration 3g03876163

  2. Remove cap (6), O-ring seal (7), nut (8), O-ring seal (9), coil assembly (10), and O-ring seal (11) from solenoid (13).

  3. Remove bolts (12), solenoid (13), O-ring seal (14), and spool (15) from control housing (2).

  4. Remove plug (16), O-ring seal (17), and shuttle valve (18) from control housing (2).

  5. Remove plug (19), O-ring seal (20), and orifice (21).

  6. Remove plug (26), O-ring seal (25), and orifice (24).

    Note: Orifice (21) and orifice (24) are not interchangeable.

  7. Remove plug (22) and O-ring seal (23).


    Illustration 4g03876211

  8. Remove cap (30), nut (29), and displacement limiter (28) from motor housing (27).


    Illustration 5g06043368

  9. Remove bolts (31) and cover (32).


    Illustration 6g06043408

  10. Remove O-ring seal (33) from cover (32).


    Illustration 7g06043407

  11. Remove bolt (36).

  12. Remove bolt (38), speed sensor (37), and O-ring seal (39) from motor housing (27).

  13. Remove bolts (35) and piston head (34) from motor housing (27).


    Illustration 8g03876347

    ------ WARNING! ------

    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.


  14. Remove plug (40), O-ring seal (41), and spring (42).

  15. Remove plug (46), O-ring seal (45), spring (44), and spool (43).

  16. Remove loop flushing valve (48) and O-ring seal (47).


    Illustration 9g03876398

  17. Remove set screw (49). Use a magnet to remove pin (50) from servo piston (51).

  18. Remove hold down screw (55), valve segment (54), and gasket (53) from piston head (35).

  19. Remove setting lug (52) from servo piston (51). Remove servo piston (51) from piston head (35).

  20. Remove servo piston head (56). Remove seal group (57) from servo piston head (56).


    Illustration 10g03876432

  21. Remove bearing plate (61) from cylinder block (60). Note orientation for reassembly.

  22. Remove synchronizing shaft assembly (59).

  23. Remove alignment pins (58).


    Illustration 11g03876443

  24. Remove retaining ring (62) and lip seal (63).

  25. Remove shaft locking screw (67) and O-ring seal (66).

  26. Press shaft assembly (64) out of housing by pressing the front face of shaft.

  27. If replacing piston rings (65), use a small pair of expanding pliers to remove them.

Information System:

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