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.

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Illustration 1	g00575124

1. Install retainer (15) onto the frame assembly.

2. Lower the temperature of bearing (14) to a temperature of −40 °C (−40°F). Install bearing (14) onto the frame assembly. Use Tool (A) in order to hold bearing (14) onto the frame assembly.
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   Illustration 2	g00475373

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   Illustration 3	g00511490

3. Use a suitable lifting device and a hoist in order to position hoist cylinder (1) onto the frame assembly. The weight of hoist cylinder (1) is 834.6 kg (1840 lb).

4. Use Tooling (B) in order to align hoist cylinder (1) with retainer (15).

5. Install hoist cylinder (1) halfway onto bearing (14) (not shown). Remove Tool (A) (not shown) from bearing (14) (not shown).

6. Install hoist cylinder (1) fully onto bearing (14) (not shown).
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   Illustration 4	g00511323

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   Illustration 5	g00511322

7. Position cover (13) over Tooling (B) (not shown). Remove Tooling (B) (not shown) one at a time and insert three bolts (12) and the washers. Tighten three bolts (12) to a torque of 370 ± 50 N·m (272.9 ± 36.9 lb ft).

   Note: The left hoist cylinder and the right hoist cylinder are identical, but the left hoist cylinder may be equipped with two quick couplers. The quick couplers are used to dump a load if the truck is disabled.

8. If necessary, install unions (10) and (11).

9. Connect hose assemblies (7) and (8). Connect hose assemblies (9).

10. 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.
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    Illustration 6	g00545899

11. Use the hydraulics of the truck in order to extend hoist cylinder (1). Align the cylinder pin bore of the truck body bracket with the cylinder pin bore of hoist cylinder (1).

    Note: Apply 5P-3931 Anti-Seize Compound to pin assembly (4) prior to installation.

12. Align spacer (5) (not shown) and install pin assembly (4) halfway through hoist cylinder (1).

13. Align spacer (6) (not shown) and install pin assembly (4) through hoist cylinder (1).
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    Illustration 7	g00545903

14. Install bar (3). Install two bolts (2) and the washers. Tighten two bolts (2) to a torque of 105 ± 20 N·m (77.44 ± 14.75 lb ft).

15. Remove the lifting device.

End By:

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