302.5C Mini Hydraulic Excavator Machine Systems Caterpillar


Relief Valve (Pilot) - Remove and Install

Usage:

302.5C GBB

Removal Procedure

Start By:

  1. Release the hydraulic system pressure. Refer to Disassembly and Assembly, "Hydraulic System Pressure - Release".


NOTICE

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 Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.

Dispose of all fluids according to local regulations and mandates.


Note: Cleanliness is an important factor. Before the disassembly procedure, the exterior of the component should be thoroughly cleaned. This will help to prevent dirt from entering the internal mechanism.

  1. Open the engine access door.



    Illustration 1g01196654

  1. Remove relief valve (1) and the O-ring seals.

Installation Procedure

Note: Cleanliness is an important factor. Before assembly, all parts should be thoroughly cleaned in cleaning fluid. Allow the parts to air dry. Wiping cloths or rags should not be used to dry parts. Lint may be deposited on the parts which may cause later trouble. Inspect all parts. If any parts are worn or damaged, use new parts for replacement.




    Illustration 2g01196654

  1. Install relief valve (1) and the O-ring seals. Tighten relief valve (1) to a torque of 27 N·m (20 lb ft).

  1. Close the engine access door.

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