521B and 522B Track Feller Bunchers Machine Systems Caterpillar


Swing Motor Relief Valve Pressure - Test and Adjust

Usage:

521B F7B


------ 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.


Specifications

Table 1
Swing Motor Crossover Relief Pressure    
Date     Equipment ID Code    
Pressure     Setting     Actual    
Swing Motor Relief Valve Pressure    
32000 ± 300 kPa (4641 ± 44 psi)    
   
Swing Signal Limiter Valve Pressure    
30300 ± 300 kPa (4395 ± 44 psi)    
   

Introduction

This information contains the following test:

  • Swing Motor Relief Valve Pressure - Test

This information contains the following adjustment:

  • Swing Motor Relief Valve Pressure - Adjust

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.

ReferenceFor 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.

ReferenceFor 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.

Required Tools

Table 2
Required Tools    
Part Number     Description     Qty    
198-4240     Digital Pressure Indicator     1    
177-7861     Hose Assembly     1    

Test Preparation

  1. Place the machine on level ground.



    Illustration 1g02587947

    The switch for the hood




    Illustration 2g01074453

  1. Open the hood for the engine compartment.

  1. Shut off the engine.



    Illustration 3g02748496

    Remove the cover underneath the machine in order to access the pilot manifold.




    Illustration 4g02748497

    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.

  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 5g02748897

    Location of implement valve (Typical example)




    Illustration 6g02748916

    Flow limiters for swing control valve on 521B machines.

    (A) Signal limiter valve CLOCKWISE

    (B) Signal limiter valve COUNTERCLOCKWISE




    Illustration 7g02748918

    Flow limiters for swing control valve on 522B machines.

    (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.

Swing Motor Relief Valve Pressure - Test




    Illustration 8g02749276

    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. Increase the hydraulic oil temperature to 50° C (122° F) to 60° C (140° F) .

  1. Move the engine speed dial to 1500 rpm.



    Illustration 9g01162712

    Hydraulic Lockout Control

  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 32000 ± 300 kPa (4641 ± 44 psi) in both directions.

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

  1. If the pressure is correct proceed to Step 9. If the pressure is not correct, proceed to "Swing Motor Relief Valve Pressure - Adjust"

  1. Readjust flow limiters (A) and (B) on the swing control valve to 30300 ± 300 kPa (4395 ± 44 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.

Swing Motor Relief Valve Pressure - Adjust




    Illustration 10g01070129

    Swing Motor (typical example)

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




    Illustration 11g01053280

  1. Loosen locknut (7) on relief valve (4). 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 32000 ± 300 kPa (4641 ± 44 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 12g01070129

    Swing Motor (typical example)

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




    Illustration 13g01053280

  1. Loosen locknut (7) on relief valve (5). 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 32000 ± 300 kPa (4641 ± 44 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 30300 ± 300 kPa (4395 ± 44 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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