784C and 785C Off-Highway Trucks Machine Systems Caterpillar

Removal Procedure

Start By:

1. Release the pressure in the air system. Refer to Disassembly and Assembly, "Air Tanks (Brake) - Purge".

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In order to prevent possible personal injury, release the air pressure from the air tank before disconnecting any components of the air system.

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

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Illustration 1	g00494481

1. Remove air relief valve (1) from air tank (2).

Installation Procedure

Note: Cleanliness is an important factor. Before the installation procedure, 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.

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Illustration 2	g00494481

Note: Before installation, apply 5P-3413 Pipe Sealant to the external tapered threads of relief valve (1).

1. Install air relief valve (1) onto air tank (2).

2. Charge the air pressure in air tank (2). Refer to Operation and Maintenance Manual, SEBU7173, "Starting with and External Air Supply" for the correct procedure.

End By:

1. Remove the wheel chocks. Refer to Disassembly and Assembly, "Wheel Chock (Front and Rear) - Remove and Install".