Start By:
- Release hydraulic system pressure.
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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, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products. Dispose of all fluids according to local regulations and mandates. |
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At operating temperature, the hydraulic oil is hot and under pressure. Hot oils can cause burns. To prevent possible personal injury, release the pressure in the work tool hydraulic circuit (boom, stick, bucket, and swing), travel circuits, and the hydraulic oil tank at the filler cap before any hydraulic lines or components are disconnected or removed. Remove the filler cap only when the engine is stopped and the filler cap is cool enough to touch. |
Note: The pilot relief valve is located in the oil filter base which is located on the hydraulic filters on the hydraulic tank.
- Open the right rear door to the pump compartment.
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Illustration 1 g00713285 - Remove pilot relief valve (1) from the oil filter base.
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Illustration 2 g00713286 Note: The individual components of the relief valve are nonserviceable. Do not disassemble the relief valve.
- Remove O-ring seal (2).
- Remove O-ring seal (3).
- Remove O-ring seal (4).
Note: O-ring seals, gaskets, and seals should always be replaced. A used O-ring seal may not have the same sealing properties as a new O-ring seal.
- Install new O-ring seals (2), (3), and (4).
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Illustration 4 g00713285 - Install pilot relief valve (1) in the oil filter base. Tighten the pilot relief valve to a torque of
117 ± 9 N·m (86 ± 7 lb ft) . - Check the hydraulic system oil level.
- Check the pilot relief valve pressure. Refer to Testing and Adjusting, "Relief Valve (Pilot) - Test and Adjust".
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| Illustration 3 | g00713286 |