320D2 GC Excavator Machine Systems Swing Motor - Remove and Install Caterpillar


Swing Motor - Remove and Install
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1.1. Removal Procedure
2.1. Installation Procedure

Removal Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
FT-2674  Vacuum Cap 
138-7573  Link Bracket 

Start By:

  1. Release the hydraulic system pressure.


NOTICE

Keep all parts clean from contaminants.

Contamination of the hydraulic system with foreign material will reduce the service life of the hydraulic system components.

To prevent contaminants from entering the hydraulic system, always plug or cap the lines, fittings, or hoses as they are disconnected. Cover any disassembled components and clean them properly before assembly.

Clean the hydraulic system properly after any major component exchange or especially after a component failure, to remove any contamination.



NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.

Dispose of all fluids according to local regulations and mandates.


Note: A hydraulic oil sample should be obtained before any maintenance is performed to establish the system contaminant level. Refer to Fluid Analysis Laboratory Guide, SEBF3116, "Obtaining an Oil Sample for S·O·S Analysis". Refer to Operation and Maintenance Manual, "Sampling Interval and Location of Sampling Valve" for the correct location.



    Illustration 1g00690963

  1. Remove the cap from the hydraulic tank. Attach Tooling (A) to the hydraulic tank.

    Note: Hook up the air to Tooling (A) to create a vacuum in the hydraulic system. This will minimize the leakage from the hose assemblies.



    Illustration 2g00950370

  2. Remove bolts (1) and the washers to remove cover (2).


    Illustration 3g00694245

  3. Remove bolts (4) and the washers to remove access cover (3) that is under the main control valve.


    Illustration 4g00694353

  4. Open the drain valve (5) to drain the oil for the swing drive.

  5. Drain the oil from the swing drive.


    Illustration 5g00694459
    Typical example

    Note: Not all machines will require the removal of hose assemblies and brace (8). Remove the hose assemblies that will make the removal of the swing motor easier.

  6. Remove bolts (9) and the washers to remove brace (8). This will allow easier access to the swing motor.

  7. Remove hose assembly (6).

  8. Disconnect hose assembly (7).


    Illustration 6g00694470

  9. Disconnect hose assemblies (10) and (12).

  10. Remove bolts (14), the washers, and the split flanges.

  11. Disconnect hose assemblies (11).

  12. Remove bolts (15), the washers, and the split flanges.

  13. Disconnect hose assembly (13) and (16).

  14. Remove bolt (17), the washer, and the clip.

  15. Disconnect harness assembly (18).


    Illustration 7g00695023

  16. Disconnect hose assembly (19).


    Illustration 8g00694484

  17. Remove bolts (21) and the washers to remove the anti-reaction valve (22).

  18. Remove bolts (20) and the washers.

  19. Prior to the removal of the swing motor, clean the swing motor and the area around the swing motor. Remove any loose paint around the mating surface of the swing drive and the swing motor to prevent contamination from entering the swing drive.


    Illustration 9g00694494

  20. Attach Tooling (B) and a suitable lifting device to swing motor (23). The weight of swing motor (23) is approximately 55 kg (120 lb).

Installation Procedure

Table 2
Required Tools 
Tool  Part Number  Part Description  Qty 
1U-8846  Gasket Sealant   


NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.

Dispose of all fluids according to local regulations and mandates.


  1. Prior to the installation of the swing motor, make sure that the mating surfaces of the swing motor and the swing drive are thoroughly clean and dry.

  2. Apply Tooling (C) on the mating surface of the swing motor and the swing drive housing.


    Illustration 10g00694494

  3. Attach Tooling (B) and a suitable lifting device to swing motor (23). The weight of swing motor (23) is approximately 55 kg (120 lb).


    Illustration 11g00694484

  4. Install the washers and bolts (20).

  5. Tighten bolts (20) to a torque of 240 ± 40 N·m (177 ± 30 lb ft).

  6. Install anti-reaction valve (22). Install the washers and bolts (21). Tighten bolts (21) to a torque of 55 ± 10 N·m (40 ± 7 lb ft).


    Illustration 12g00690963

  7. Remove the cap to the hydraulic tank. Attach Tooling (A) to the hydraulic tank.

    Note: Hook up the air to Tooling (A) to create a vacuum in the hydraulic system. This will minimize the leakage from the hose assemblies.

    Note: Replace the O-ring seals that are used in the ends of the hose assemblies.



    Illustration 13g00695023

  8. Connect hose assembly (19).


    Illustration 14g00694470

  9. Connect hose assembly (13).

  10. Install the split flanges, the washers, and bolts (15).

  11. Connect hose assembly (16).

  12. Connect hose assembly (11).

  13. Install the split flanges, the washers, and bolts (14).

  14. Connect hose assembly (12).

  15. Connect hose assembly (10).

  16. Connect harness assembly (18).

  17. Install the clip, the washer, and bolt (17).


    Illustration 15g00694459
    Typical example

  18. Connect hose assembly (7) (If Equipped).

  19. Install hose assembly (6) (If Equipped).

  20. Install brace (8) with washers and bolts (9) (If Equipped).


    Illustration 16g00694353

  21. Make sure that the drain valve (5) is closed.

  22. Remove Tooling (A) and install the cap to the hydraulic tank.


    NOTICE

    To avoid system damage, make sure that the hydraulic motor is properly filled with hydraulic oil before start-up.


  23. Install high efficiency filters in place of the pilot filter, the case drain filter, and the return filter.

    Note: High efficiency filters should not be run for more than 250 hours before you change back to the standard filters.

  24. Fill the hydraulic oil tank and the swing drive with clean hydraulic oil to the correct level.

    Reference: Refer to Operation and Maintenance Manual, "Lubricant Viscosities" for the proper oil viscosity.

    Reference: Refer to Operation and Maintenance Manual, "Hydraulic System Oil Level - Check" and Operation and Maintenance Manual, "Swing Drive Oil Level - Check" for the correct filling procedures.

  25. Start the engine, and check the operation of the swing drive. Also, check for leaks. Stop the engine.

  26. Obtain a hydraulic oil sample from the main S·O·S port.

    Reference: Refer to Operation and Maintenance Manual, "Sampling Interval and Location of Sampling Valve" for the correct location.

  27. If the S·O·S sample exceeds ISO 18/15, flush the hydraulic system.

    Reference: Refer to Contamination Control Guidelines, SEBF8436, "Hydraulic System Flushing Procedure for 320C Hydraulic Excavators" for further information.



    Illustration 17g00694245

  28. Install the washers and bolts (4) to install access cover (3) that is under the main control valve.


    Illustration 18g00950370

  29. Install the washers and bolts (1) to install cover (2).

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