| Required Tools | |
| Part Number | Description |
| 8T-5320 | Hydraulic Test Group |
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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. |
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Sudden movement or accidental starting of the machine can cause personal injury or death to persons on or near the machine. To prevent personal injury or death, perform the following: Park the machine on a smooth, level surface. Lower the bucket and/or attachments to the ground and engage the parking brake. Stop the engine and remove the key. Block the wheels and install the steering frame lock. |
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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, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
Running Engine
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| Illustration 1 | g00298199 |
Pilot Control Valve (Oil Manifold) (1) Pressure Reducing Valve (2) Pressure Reducing Valve (3) Pressure Tap | |
Note: The pilot control valve (oil manifold) is located on the mounting plate for the main control valve.
- Stop the engine.
- Attach an 8T-5320 Hydraulic Test Group to pressure tap (3) .
- Start the engine and run the engine at high idle. Bring the oil to normal operating temperature. The pressure reading should be 2600 ± 200 kPa (377 ± 29 psi).
- If the pressure reading is correct, proceed to Step 8.
- If the pressure reading is not correct, stop the engine and release the hydraulic system pressure. Refer to Testing and Adjusting, "System Pressure - Release".
- Replace the 154-0191 Pressure Reducing Valve. Tighten the valve to a torque of 60 ± 7 N·m (45 ± 5 lb ft).
- Repeat Step 3 through 5.
- Stop the engine and remove the test equipment from pressure tap (3) .
Stopped Engine with Raised Bucket
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| Illustration 2 | g00298199 |
Pilot Control Valve (Oil Manifold) (1) Pressure reducing valve (2) Pressure reducing valve (3) Pressure tap | |
Note: The pilot control valve (oil manifold) is located on the mounting plate for the main control valve.
- Stop the engine.
- Attach an 8T-5320 Hydraulic Test Group to pressure tap (3) .
- Start the engine and raise the bucket off the ground.
- Stop the engine. With the oil at normal operating temperature, the pressure reading must be 2070 ± 200 kPa (300 ± 29 psi).
- If the pressure reading is correct, proceed to Step 9.
- If the pressure reading is not correct, release the hydraulic system pressure. Refer to Testing and Adjusting, "System Pressure - Release".
- Replace the 154-8871 Secondary Pressure Reducing Valve. Tighten the valve to a torque of 60 ± 7 N·m (45 ± 5 lb ft).
- Repeat Steps 3 through 6.
- Remove the test equipment from pressure tap (3) .