TUBE AS 1958359 - Caterpillar

Removal Procedure
Note: A hydraulic oil sample should be obtained before any maintenance is performed in order to establish the system contaminant level. Refer to Fluid Analysis Laboratory Guide, SEBF3116, "Obtaining an Oil Sample for S O S Analysis". Refer to Operation and Maintenance Manual, "Sampling Interval and Location of Sampling Valve" for the correct location.
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.
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 implement 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.
Release hydraulic system pressure.Reference: Refer to Disassembly and Assembly, "Hydraulic System Pressure - Release" in this manual.
Open the right rear door to the pump compartment.
Illustration 1 g00880825
Remove pilot relief valve (1) from the oil filter base.
Illustration 2 g00713286
Illustration 3 g00880901
Note: The individual components of the relief valve are nonserviceable. Do not disassemble the relief valve.
Remove O-ring seal (2) from the pilot relief valve.
Remove O-ring seal (3) from the pilot relief valve.
Remove O-ring seal (4) from the pilot relief valve.Installation Procedure
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.
Note: O-rings, gaskets, and seals should always be replaced. A used O-ring may not have the same sealing properties as a new O-ring. Use 1U-6396 O-Ring Assembly Compound during the assembly procedure.
Illustration 4 g00713286
Install new O-ring seal (4) on the pilot relief valve.
Install new O-ring seal (3) on the pilot relief valve.
Install new O-ring seal (2) on the pilot relief valve.
Illustration 5 g00880825
Illustration 6 g00880901
Install pilot relief valve (1) in the oil filter base. Tighten the pilot relief valve to a torque of 117.6 9.8 N m (86.74 7.23 lb ft).
Check the hydraulic system oil level.Reference: Refer to Operation and Maintenance Manual, "Lubricant Viscosities and Refill Capacities" for the proper filling procedure and the proper level for the hydraulic oil system.
Adjust the pilot relief valve pressure. Refer to Testing and Adjusting for