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

Removal Procedure

Start By:

1. Remove the retarder control check valve. Refer to Disassembly and Assembly, "Check Valve (Retarder Control) - Remove and Install".

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.

Note: Put identification marks on all hose assemblies, on all tube assemblies and on all wire harnesses for installation purposes. Plug all hose assemblies and all tube assemblies. This helps to prevent fluid loss and this helps to prevent contaminants from entering the system.

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Illustration 1	g00521458

1. Disconnect hose assembly (2) from automatic retarder control valve (1).
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   Illustration 2	g00521460

2. Disconnect wire harness (3) at the electrical connection.

3. Disconnect wire harness (4) at the electrical connection.

4. Disconnect wire harness (5) at the electrical connection.
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   Illustration 3	g00521475

5. Remove two bolts (6), the washers and the clips in order to remove automatic retarder control valve (1).

Installation Procedure

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Illustration 4	g00521475

1. Use two bolts (6), the washers and the clips in order to install automatic retarder control valve (1).
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   Illustration 5	g00521460

2. Connect wire harness (5) at the electrical connection.

3. Connect wire harness (4) at the electrical connection.

4. Connect wire harness (3) at the electrical connection.
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   Illustration 6	g00521458

5. Connect hose assembly (2) to automatic retarder control valve (1).

End By:

1. Install the retarder control check valve. Refer to Disassembly and Assembly, "Check Valve (Retarder Control) - Remove and Install".