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

Removal Procedure

Start By:

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

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

3. Remove the oil filter and base (torque converter). Refer to Disassembly and Assembly, SENR1490, "Oil Filter and Base (Torque Converter) - Remove".

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At operating temperature, the hydraulic tank is hot and under pressure. Hot oil and components can cause personal injury. Do not allow hot oil or components to contact skin. Remove the filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. Remove the filler cap slowly in order to relieve pressure.

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.

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Illustration 1	g00506961

1. Drain the hydraulic oil from tank (A) of hydraulic tank (1) into a suitable container. The capacity of tank (A) is 420 L (111 US gal). Refer to Operation and Maintenance Manual, SEBU7173, "Hoist, Torque Converter and Brake Tank Oil - Change" for the correct procedure.

2. Drain the hydraulic oil from tank (B) of hydraulic tank (1) into a suitable container. The capacity of tank (B) is 83 L (22 US gal). Refer to Operation and Maintenance Manual, SEBU7173, "Transmission Tank Oil - Change" for the correct procedure.
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   Illustration 2	g00506965

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   Illustration 3	g00506970
   (2) Transmission suction port. (3) ( 4) Hoist pump suction port. (5) Brake cooling suction port. (6) Converter suction port. (7) Auxiliary port.

3. Remove the following hose assemblies: (2), (3), (4), (5), (6) and (7).
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   Illustration 4	g00506987
   (8) Converter scavenger return port. (9) Parking brake drain port. (10) Parking brake lip seal drain port. (11) Brake make-up tank return port .

4. Remove the following hose assemblies: (8), (9), (10) and (11).
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   Illustration 5	g00506992
   (12) Transmission return port. (13) Converter inlet relief port. (14) ( 15) ( 16) Brake cooling ports. (17) Control valve return port.

5. Remove the following hose assemblies: (12), (13), (14), (15), (16) and (17)
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   Illustration 6	g00574322

6. Use a suitable lift truck (not shown) in order to support hydraulic tank (1).
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   Illustration 7	g00507002

7. Remove one bolt (18), the locknut, the washers and the mountings.
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   Illustration 8	g00506994

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   Illustration 9	g00506995

8. Disconnect hose assembly (21) and (24).

9. Remove two bolts (19) and the washers. Remove cap (20).

10. Remove two bolts (22) and the washers. Remove cap (23).

11. Use the lift truck (not shown) in order to remove hydraulic tank (1) from the frame assembly. The weight of hydraulic tank (1) is 367 kg (810 lb).