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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. |
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| 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. |
Two people are needed in order to complete the test procedure.
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.
| Required Tools | ||
| Part Number | Description | Qty |
| 8T-0860 | Pressure Gauge | 1 |
| 7X-2444 | Swivel Tee | 1 |
| 187-3547 | Fitting | 1 |
- Place the machine on level ground.
- Open the hood for the engine compartment.
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| Illustration 1 | g01052558 |
Older models The switch for the hood | |
Note: The switch for the hood is located underneath the right armrest.
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| Illustration 2 | g01162081 |
Newer models | |
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| Illustration 3 | g01069398 |
- Move the hydraulic lockout control to the LOCKED position.
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| Illustration 4 | g00827465 |
Older models | |
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| Illustration 5 | g01162747 |
Newer models | |
- Shut off the engine.
- 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.
- Disconnect the hose from cylinder (1) on the engine side. Install the swivel tee with fitting. Attach the pressure gauge to the fitting.
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| Illustration 6 | g01070750 |
(1) Cylinder (hood) (engine side) | |
- Start the engine. Operate the engine at low idle.
- Move the switch for the hood to the OPEN position.
- Read the pressure gauge. The pressure should be 20685 kPa (3000 psi). If the pressure is incorrect proceed to Step 10. If the pressure is correct proceed to Step 11.
- Loosen the locknut on adjustment screw (3). Turn the adjustment screw clockwise in order to increase the pressure. Turn the adjustment screw counterclockwise in order to decrease the pressure. Adjust the pressure to 20685 kPa (3000 psi). Tighten the locknut.
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| Illustration 7 | g01070755 |
(2) Hood pump and motor. (3) Adjustment screw for the relief valve. | |
- Shut off the engine
- 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.
- Remove the test equipment.
- Reconnect the hose to cylinder (1) .
- Start the engine. Close the hood.