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

Removal Procedure

Start By:

1. Remove the cab front plate. Refer to Disassembly and Assembly, "Plate (Cab Front) - Remove and Install".

2. Release the air system pressure. 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.

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	g00520739

1. Disconnect hose assembly (1) from elbow (2).
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   Illustration 2	g00520740

2. Disconnect hose assembly (3) from connector (4).
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   Illustration 3	g00520741

3. Disconnect hose assembly (5) from connector (6).
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   Illustration 4	g00520752

4. Disconnect sensor (7) from the wire harness at the electrical connection.
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   Illustration 5	g00520754

5. Disconnect hose assembly (8) from connector (9).
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   Illustration 6	g00520755

6. Disconnect check valve (12) and the connector assembly from adapter (10).

7. Remove bolt (11) and the washer in order to remove check valve (12) and the connector assembly.
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   Illustration 7	g00520790

8. Remove elbow (2) and connector (4) from tee (13).

9. Remove tee (13) from check valve (12).
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   Illustration 8	g00520791

10. Remove connector (9) from tee (15).

11. Remove tee (15) from nipple (14).

12. Remove nipple (14) from check valve (12).
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    Illustration 9	g00520793

13. Remove sensor (7) from connector (17).

14. Remove connector (17) and connector (6) from tee (16).

15. Remove tee (16) from check valve (12).

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.

Note: Apply 5P-3413 Pipe Sealant to the threads of all connectors, nipples and tees.

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Illustration 10	g00520793

1. Install tee (16) to check valve (12), as shown.

2. Install connector (6) and connector (17) to tee (16), as shown.

3. Install sensor (7) to connector (17).
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   Illustration 11	g00520791

4. Install nipple (14) to check valve (12).

5. Install tee (15) to nipple (14), as shown.

6. Install connector (9) to tee (15), as shown.
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   Illustration 12	g00520790

7. Install tee (13) to check valve (12), as shown.

8. Install connector (4) and elbow (2) to tee (13), as shown.
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   Illustration 13	g00520755

9. Install check valve (12) and the connector assembly to adapter (10), as shown.

10. Install one bolt (11) and the washer to check valve (12).
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    Illustration 14	g00520754

11. Connect hose assembly (8) to connector (9).
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    Illustration 15	g00520752

12. Connect sensor (7) to the wire harness at the electrical connection.
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    Illustration 16	g00520741

13. Connect hose assembly (5) to connector (6).
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    Illustration 17	g00520740

14. Connect hose assembly (3) to connector (4).
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    Illustration 18	g00520739

15. Connect hose assembly (1) to elbow (2).

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

End By:

1. Install the cab front plate. Refer to Disassembly and Assembly, "Plate (Cab Front) - Remove and Install".

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