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".

Show/hide table

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 and on all tube assemblies 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.

Show/hide table

Illustration 1	g00522887

1. Disconnect hose assembly (2) from elbow (1).
   Show/hide table

   Illustration 2	g00522920

2. Disconnect hose assembly (3) from elbow (1).
   Show/hide table

   Illustration 3	g00522923

3. Disconnect hose assembly (6) from elbow (5).

4. Remove elbow (5) and elbow (1) from connector (7).

5. Remove connector (7) from check valve (4).
   Show/hide table

   Illustration 4	g00522925

6. Disconnect hose assembly (9) from elbow (8).
   Show/hide table

   Illustration 5	g00522927

7. Remove bolt (10) in order to remove check valve (4).

8. Remove elbow (1) from check valve (4).

9. Remove elbow (8) from check valve (4).

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 elbows, connectors and tees.

Show/hide table

Illustration 6	g00522927

1. Install elbow (8) to check valve (4), as shown.

2. Install elbow (1) to check valve (4), as shown.

3. Use one bolt (10) in order to install check valve (4), as shown.
   Show/hide table

   Illustration 7	g00522925

4. Connect hose assembly (9) to elbow (8).
   Show/hide table

   Illustration 8	g00522923

5. Install connector (7) to check valve (4), as shown.

6. Install elbow (5) and elbow (1) to connector (7), as shown.

7. Connect hose assembly (6) to elbow (5).
   Show/hide table

   Illustration 9	g00522920

8. Connect hose assembly (3) to elbow (1).
   Show/hide table

   Illustration 10	g00522887

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

10. Charge the pressure in the air tanks. 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".