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

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.

1. Check all of the O-ring seals and the components for wear or damage. Replace the components, if necessary.

2. Lubricate all of the O-ring seals lightly with the lubricant that is being sealed.
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   Illustration 1	g00499853

3. If the plate and the fittings were removed, install the plate and the fittings prior to installing electric pump (1) to the frame assembly.

4. Use two bolts (8) and the washers in order to install electric pump (1) to the frame assembly.

5. Install relief valve (7) onto electric pump (1).
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   Illustration 2	g00499850

6. Connect hose assembly (5) to the relief valve.

7. Connect hose assembly (6) to electric pump (1).
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   Illustration 3	g00499860

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   Illustration 4	g00499846

8. Use nut (3) in order to connect wire harness (4) to electric pump (1).

9. Repeat Step 8 for the remaining nut (3).

10. Reposition two rubber boots (2) on electric pump (1).

11. Fill the hydraulic tank with hydraulic oil to the correct level. Refer to Operation and Maintenance Manual, SEBU7173, "Hoist, Torque Converter and Brake Tank Oil - Change" for the correct procedure.

12. Charge the air pressure in the air tank. Refer to Operation and Maintenance Manual , SEBU7173, "Starting With An External Air Supply" for the correct procedure.
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    Personal injury or death can result from air in the oil for the brake hydraulic system. Air in the system can prevent complete brake application and it is possible that the wheels on the machine can not be stopped. Air must not be in the oil for the brake hydraulic system to function properly.

13. After electric pump (1) is installed and the air reservoir has been recharged, purge the air from the hydraulic oil in the brake hydraulic system. Refer to Systems Operation/Testing and Adjusting, SENR1494, "Brake System Air - Purge" for the correct procedure.

End By:

1. Remove the retaining cable. Refer to Disassembly and Assembly, "Truck Body Retaining Cable - Remove and Install".

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