773D, 773E, 775D and 775E Off-Highway Trucks Machine Systems Piston Pump (Steering) - Disassemble Caterpillar


Piston Pump (Steering) - Disassemble
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1.1. Disassembly Procedure

Disassembly Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
1P-1857  Retaining Ring Pliers 
1P-1858  Retaining Ring Pliers 
1P-0510  Driver Group 

Start By:

  1. Remove the piston pump (steering). Refer to Disassembly and Assembly, "Piston Pump (Steering) - Remove".


    Illustration 1g00551023

  1. Remove socket head bolts (3). Remove pressure and flow compensator valve (2) from steering piston pump (1).


    Illustration 2g00551251

  2. Remove O-ring seals (4) from pressure and flow compensator valve (2).


    Illustration 3g00932868

  3. Position flow compensator valve (2) in a soft jawed vise.

  4. Remove plug (13) and seal (14) from pressure and flow compensator valve (2).

    ------ 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.


  5. Remove plug (17) from pressure and flow compensator valve (2).

  6. Remove cap nut (12), seal (11), adjustment nut (10), seal (9), and adjustment screw (18) from plug (17).

  7. Remove O-ring seal (16) from plug (17).

  8. Remove seat (15), spring (8), spring (7), spring retainer (6), and valve stem (5) from pressure and flow compensator valve (2).


    Illustration 4g00932869

  9. Remove plug (26) and seal (27) from pressure and flow compensator valve (2).

    ------ 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.


  10. Remove plug (20) from pressure and flow compensator valve (2).

  11. Remove cap nut (25), seal (24), adjustment nut (22), seal (21), and adjustment screw (23) from plug (20).

  12. Remove O-ring seal (19) from plug (20).

  13. Remove seat (32), spring (31), spring (30), spring retainer (29), and valve stem (28) from pressure and flow compensator valve (2).


    Illustration 5g00551321

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

    Personal injury can result from parts and/or covers under spring pressure.

    Spring force will be released when covers are removed.

    Be prepared to hold spring loaded covers as the bolts are loosened.


  14. Remove socket head bolts (35). Remove head (34) from pump housing (33).


    Illustration 6g00551323


    Illustration 7g00603421

  15. Remove O-ring seals (37) from head (34).

  16. Remove piston guide (36) and plunger guide (38) from head (34).

  17. Remove roller bearing cup (39) and spacer (40) from head (34).

  18. Remove pin (41) from head (34).


    Illustration 8g00932870

  19. Remove O-ring seal (46) from pump housing (33).

  20. Remove spring (44) and control piston (43) from the swashplate assembly.

  21. Remove valve plate (45) from the barrel.

  22. Remove roller bearing cone (42) from the pump shaft.


    Illustration 9g00932871

  23. Remove spacer (48) and rotating assembly (47) from pump housing (33).


    Illustration 10g00931537

  24. Remove plate (49) and nine piston assemblies (50) from the rotating assembly.


    Illustration 11g00551339

  25. Remove swashplate assembly (51) from pump housing (33).


    Illustration 12g00551343

  26. Remove pump shaft (53) and roller bearing cone (54) from pump housing (33). Remove roller bearing cone (54) from pump shaft (53).


    Illustration 13g00551349

  27. Remove O-ring seal (56) from pump housing (33).

  28. Remove shaft seal (55) from pump housing (33).


    Illustration 14g00932873

  29. Remove two bearings (57) from pump housing (33).

  30. Remove shaft seal (59) from pump housing (33).

  31. Use Tooling (A) (not shown) to remove ring (60) (not shown) from pump housing (33).

  32. Remove roller bearing cup (58) from pump housing (33).


    Illustration 15g00551357

  33. Remove plug (61) and the O-ring seal.


    Illustration 16g00551360

  34. Remove pin (62) from barrel (47).


    Illustration 17g00932874


    Illustration 18g00932875

    ------ 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.


  35. Position barrel (47) in a suitable press, as shown. Use Tooling (B) and the press in order to compress spring (64).

  36. Use Tooling (C) to remove retaining ring (63). Remove spring (64) and spring seat (65) from barrel (47).

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