TK711, TK721, TK722 and TK732 Track Feller Bunchers Hydraulic System Piston Motor (Swing Drive) Relief Valve Pressure - Test and Adjust Caterpillar


Piston Motor (Swing Drive) Relief Valve Pressure - Test and Adjust
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1.1. Preparation for Test
2.1. Test

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

Personal injury can result from contact with hot hydraulic oil and from contact with hydraulic oil that is under high pressure.

Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. The hydraulic oil pressure must be released before any service on the hydraulic system is performed or serious personal injury could occur.

Verify that all of the work tools have been completely lowered to the ground. Release the hydraulic oil pressure at the hydraulic tank through the breaker relief valve when the breaker relief valve is cool enough to touch with your bare hand. Verify that the hydraulic oil is cool before you begin to remove any hydraulic components or hydraulic lines.

----------------------


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, "Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids.

Dispose of all fluids according to local regulations and mandates.


Note: Use the information in the reference to prepare the machine for this test. Also, use the information in the reference to relieve any system pressure that may be present in the hydraulic system.

Reference: For the correct procedure to prepare the machine for this test, refer to Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.

Reference: For the correct procedure to relieve any hydraulic oil pressure that may be present in the hydraulic system, refer to Testing and Adjusting, "System Pressure - Release" for the machine that is being serviced.

Table 1
Required Tools    
Part Number     Description     Qty    
198-4240     Digital Pressure Indicator     1    
177-7861     Hose As     1    

Preparation for Test

  1. Place the machine on level ground.



    Illustration 1g01052558

    Location of the switch for the hood on early machines




    Illustration 2g01162235

    Location of the switch for the hood on later machines




    Illustration 3g01074453

  1. Open the hood for the engine compartment.

    Note: The switch for the hood is located underneath the right armrest on early machines. On later machines, the switch for the hood is located on the right hand console.

  1. Shut off the engine.

  1. Release all the system hydraulic pressure. For information on the correct procedure to release pressure, refer to the reference at the beginning of this test.



    Illustration 4g01078274

    Location of the pilot manifold




    Illustration 5g01053252

    The solenoid for the swing parking brake is located on the pilot manifold.

  1. Disconnect the wire from the solenoid for the swing parking brake.



    Illustration 6g01078276

    Location of the implement control valve




    Illustration 7g01078280

    The main relief valve on the implement control valve

  1. A temporary setting of the main relief valve on the travel control valve is required before you perform the test procedure.



    Illustration 8g01078284

    Main Hydraulic Pumps

    (1) Pressure tap for implement pump. (2) Implement pump.

  1. Attach the 198-4240 Digital Pressure Indicator to pressure tap (1) .

  1. Start the engine.

  1. Move the hydraulic lockout to the UNLOCKED position.

    Move the engine speed dial to high idle. Raise the boom to the STALLED position.

  1. Loosen the locknut on the main relief valve of the implement control valve. Turn the adjustment screw clockwise until the pressure gauge reads 35500 ± 690 kPa (5150 ± 100 psi). This will allow the line relief valves of the swing motor to actuate before the main relief valve.

  1. Tighten the locknut on the main relief valve.

  1. Shut off the engine



    Illustration 9g01078290

    Flow Limiters for the Swing Control Valve on the Implement Control Valve

    (A) Signal limiter valve CLOCKWISE. (B) Signal limiter valve COUNTERCLOCKWISE.

  1. Turn signal limiter valves (A) and (B) until the flow limiters bottom out on the swing control valve.

Test

  1. Start the engine.

  1. Increase the hydraulic oil temperature to 55° ± 5°C (130° ± 10°F).

  1. Move the engine speed dial to high idle.



    Illustration 10g00827520

    Hydraulic Lockout Control on early machines




    Illustration 11g01162811

    Hydraulic lockout control on later machines

  1. Move the hydraulic lockout control to the UNLOCKED position.

  1. Slowly move the left joystick control for a full RIGHT swing operation. Read the pressure gauge. Slowly move the left joystick control for a full LEFT swing operation. Read the pressure gauge. The pressure should be 31025 ± 205 kPa (4500 ± 30 psi) in both directions.

  1. Move the left joystick control to the HOLD position.

  1. If the pressure is correct proceed to Step 18. If the pressure for the RIGHT swing is incorrect proceed to Step 8 in order to adjust the relief valve. If the pressure for the LEFT swing is incorrect proceed to Step 12 in order to adjust the relief valve.



    Illustration 12g00934868

    Swing Motor

    (3) Swing motor. (4) Relief valve (swing left). (5) Relief valve (swing right).




    Illustration 13g01078314

    (6) Adjustment screw. (7) Locknut.

  1. Loosen locknut (7) on relief valve (5). Slowly move the left joystick control for a full RIGHT swing operation.

  1. Turn adjustment screw (6) clockwise in order to increase the pressure. Turn adjustment screw (6) counterclockwise in order to decrease the pressure.

  1. Adjust the pressure to 31025 ± 205 kPa (4500 ± 30 psi). Move the left joystick control to the HOLD position.

    Note: Always make final pressure adjustment on the pressure rise.

  1. Tighten locknut (7) .



    Illustration 14g00934868

    Swing Motor

    (3) Swing motor. (4) Relief valve (swing left). (5) Relief valve (swing right).




    Illustration 15g01078314

    (6) Adjustment screw. (7) Locknut.

  1. Loosen locknut (7) on relief valve (4). Slowly move the left joystick control for a full LEFT swing operation.

  1. Turn adjustment screw (6) clockwise in order to increase the pressure. Turn adjustment screw (6) counterclockwise in order to decrease the pressure.

  1. Adjust the pressure to 31025 ± 205 kPa (4500 ± 30 psi). Move the left joystick control to the HOLD position.

    Note: Always make final pressure adjustment on the pressure rise.

  1. Tighten locknut (7) .

  1. Readjust flow limiters (A) and (B) on the swing control valve to 28785 ± 480 kPa (4175 ± 70 psi).

  1. Readjust the main relief valve to 35500 ± 690 kPa (5150 ± 100 psi).

  1. Move the engine speed dial to low idle. Shut off the engine.

  1. Release all the system hydraulic pressure.

  1. Remove the test equipment.

  1. Reconnect the wire to the solenoid for the swing parking brake.

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