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 |
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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
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
Required Tools     | ||
Part Number     | Description     | Qty     |
198-4240     | Digital Pressure Indicator     | 1     |
177-7861     | Hose Assembly     | 1     |
Test Preparation
- Place the machine on level ground.
- Open the hood for the engine compartment.
Illustration 1 | g02587947 |
The switch for the hood |
Illustration 2 | g01074453 |
- Shut off the engine.
- Disconnect the wire from the solenoid for the swing parking brake.
Illustration 3 | g02748496 |
Remove the cover underneath the machine in order to access the pilot manifold. |
Illustration 4 | g02748497 |
The solenoid for the swing parking brake is located on the pilot manifold. |
- 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.
- Turn signal limiter valves (A) and (B) until the flow limiters bottom out on the swing control valve.
Illustration 5 | g02748897 |
Location of implement valve (Typical example) |
Illustration 6 | g02748916 |
Flow limiters for swing control valve on 521B machines. (A) Signal limiter valve CLOCKWISE (B) Signal limiter valve COUNTERCLOCKWISE |
Illustration 7 | g02748918 |
Flow limiters for swing control valve on 522B machines. (A) Signal limiter valve CLOCKWISE (B) Signal limiter valve COUNTERCLOCKWISE |
Swing Motor Relief Valve Pressure - Test
- Attach the 198-4240 Digital Pressure Indicator to pressure tap (1) .
Illustration 8 | g02749276 |
Main Hydraulic Pumps (1) Pressure tap for implement pump (2) Implement pump |
- Start the engine.
- Increase the hydraulic oil temperature to 50° C (122° F) to 60° C (140° F) .
- Move the engine speed dial to 1500 rpm.
- Move the hydraulic lockout control to the UNLOCKED position.
Illustration 9 | g01162712 |
Hydraulic Lockout Control |
- 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.
- Move the left joystick control to the HOLD position.
- If the pressure is correct proceed to Step 9. If the pressure is not correct, proceed to "Swing Motor Relief Valve Pressure - Adjust"
- Readjust flow limiters (A) and (B) on the swing control valve to 30300 ± 300 kPa (4395 ± 44 psi).
- Move the engine speed dial to low idle. Shut off the engine.
- Release all the system hydraulic pressure.
- Remove the test equipment.
- Reconnect the wire to the solenoid for the swing parking brake.
Swing Motor Relief Valve Pressure - Adjust
- Loosen locknut (7) on relief valve (4). Slowly move the left joystick control for a full RIGHT swing operation.
Illustration 10 | g01070129 |
Swing Motor (typical example) (3) Swing motor. (4) Relief valve (swing right). (5) Relief valve (swing left). |
Illustration 11 | g01053280 |
- Turn adjustment screw (6) clockwise in order to increase the pressure. Turn adjustment screw (6) counterclockwise in order to decrease the pressure.
- 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.
- Tighten locknut (7) .
- Loosen locknut (7) on relief valve (5). Slowly move the left joystick control for a full LEFT swing operation.
Illustration 12 | g01070129 |
Swing Motor (typical example) (3) Swing motor. (4) Relief valve (swing right). (5) Relief valve (swing left). |
Illustration 13 | g01053280 |
- Turn adjustment screw (6) clockwise in order to increase the pressure. Turn adjustment screw (6) counterclockwise in order to decrease the pressure.
- 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.
- Tighten locknut (7) .
- Readjust flow limiters (A) and (B) on the swing control valve to 30300 ± 300 kPa (4395 ± 44 psi).
- Move the engine speed dial to low idle. Shut off the engine.
- Release all the system hydraulic pressure.
- Remove the test equipment.
- Reconnect the wire to the solenoid for the swing parking brake.