320D2 GC Excavator Machine Systems Swing Motor - Assemble Caterpillar


Swing Motor - Assemble
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1.1. Assembly Procedure

Assembly Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
1P-1859  Retaining Ring Pliers 
1P-0510  Driver Group 
1U-6396  O-Ring Assembly Compound   

Note: Cleanliness is an important factor. Before assembly, all parts should be thoroughly cleaned in cleaning fluid. Allow the parts to air dry. Wiping cloths or rags should not be used to dry parts. Lint may be deposited on the parts which may cause later trouble. Inspect all parts. If any parts are worn or damaged, use new parts for replacement. All disassembly and all assembly procedures must be performed on a clean work surface and in a clean hydraulic area. Keep cleaned parts covered and protected at all times.

Note: O-ring seals, gaskets, and seals should always be replaced. A used O-ring seal may not have the same sealing properties as a new O-ring seal. Use Tooling (F) during the assembly procedure.

Note: Apply a light film of hydraulic oil to all components before assembly.



    Illustration 1g00705445

  1. Install O-ring seal (45) onto the fitting (44).


    Illustration 2g00705442

  2. Install fitting (44) into the motor housing.


    Illustration 3g00705441

  3. Lubricate the lip seal (43) with clean hydraulic oil. install lip seal (43) into the motor housing with the lip toward the inside of the motor housing.


    Illustration 4g01022013
    Typical Example


    Illustration 5g01287176

  4. Use Tooling (E) to install bearing (42) into the motor housing.


    Illustration 6g00705595

  5. Raise the temperature of bearing race (41). Install the bearing race on the shaft.


    Illustration 7g00705592

  6. Raise the temperature of bearing race (40). Install the bearing race on the shaft.


    Illustration 8g00705597


    Illustration 9g00705258

  7. Install shrink wrap tubing onto shaft (39). The shrink wrap tubing will protect the seal during installation of shaft (39). Install shaft (39) into the motor housing.


    Illustration 10g00705602

  8. Use Tooling (B) to install retaining ring (38) onto shaft (39). Remove the shrink wrap tubing.


    Illustration 11g00705209

  9. Install swashplate (37) into the motor housing.


    Illustration 12g01021919
    Typical Example

  10. Install O-ring seals (36) and (36a) into the motor housing.


    Illustration 13g01021909

  11. Connect plates (34) and (35).


    Illustration 14g01021903

  12. Install pistons (33) into plates (34) and (35).


    Illustration 15g01021898

  13. Install pistons (33) into barrel (32).


    Illustration 16g01022034

  14. Install barrel (32) and the piston assembly into the motor housing as one unit. It may be necessary to use string to keep the barrel and the piston assembly together during installation.


    Illustration 17g01022038

    Note: Make sure that the tooth cut locations of each friction plate are in alignment. Also, the tooth cut locations of each separator plate must be in alignment in the body of the swing motor.

  15. Apply clean hydraulic oil on four separator plates and three friction plates (31). Install plates (31) in alternating order in the body of the swing motor. Begin with a separator plate, and end with a separator plate.


    Illustration 18g01021875

  16. Install piston (30) into the motor housing.


    Illustration 19g00704796

  17. Install port plate (29) into the motor housing. Install springs (28) into the motor housing.


    Illustration 20g00704771

  18. Install spring pins (26) and bearing (27) into the head.


    Illustration 21g00704754

  19. Install O-ring seal (25) onto the head.


    Illustration 22g00704749

  20. Install O-ring seal (23) and O-ring seal (24) onto the fittings (19) and (20).


    Illustration 23g00704743

  21. Install O-ring seal (22) onto the plug (21).


    Illustration 24g00704741

  22. Install tee fitting (19), fitting (20), and plugs (21) into the head. Tighten plugs (21) to a torque of 59 ± 6 N·m (44 ± 4 lb ft).


    Illustration 25g00704734

    ------ 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.


  23. Install spool valve (15), spring (16), O-ring seal (17), and plug (18) into the head. Tighten plug (18) to a torque of 334 ± 33 N·m (246 ± 24 lb ft). Repeat for the opposite side.


    Illustration 26g00705818

  24. Install port plate (29) onto the head.


    Illustration 27g00705827

    ------ 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.


  25. Install springs (28) onto the piston. Install head (1) onto the motor housing.


    Illustration 28g00704719

  26. Install bolts (14) into the head. Tighten bolts (14) to a torque of 430 ± 43 N·m (317 ± 32 lb ft).


    Illustration 29g00704710

  27. Install O-ring seals (10), (12), and (13). Install back up rings (9) and (11).


    Illustration 30g00704704

  28. Install relief valves (8) into the head.


    Illustration 31g00704621

  29. Install dipstick tube (5) and breather tube (6) into motor housing (7).


    Illustration 32g00704611

  30. Install mounting bolts (4). Install anti-reaction valve (3) into head (1). Install bolts (2).

End By:

  1. Install the swing motor.

Information System:

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