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 (Front and Rear) - Remove and Install".

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Follow the recommended procedure for removal and installation of tires and or wheel assemblies. Ensure that the machine and tire and or wheel assembly are properly supported at all times. Improper procedures that are used to remove and install tires and or wheel assemblies can result in personal injury or death.

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Servicing and changing tires and rims can be dangerous. This work must be done only by trained personnel with correct tools and procedures. If correct procedures are not followed while servicing tires and rims, the assemblies can burst with explosive force and cause serious physical injury or death. Follow carefully the specification information provided by your tire servicing person or dealer.

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: The following procedure shows the front tire and rim on the right side.

Note: Refer to the Operation and Maintenance Manual for the correct tire handling recommendations and tire inflation procedures.

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Illustration 1	g00500940

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Illustration 2	g01133390

1. Place Tooling (A) under the front chassis. Refer to Operation and Maintenance Manual, "Jacking Locations" for the correct locations. Use Tooling (A) to lift the front chassis until the weight of the truck is off the front tires and rims. Use Tooling (C) to keep the front suspension cylinder from extending.
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   Illustration 3	g00500943

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   Illustration 4	g00713802

2. Use Tooling (B) to remove 42 nuts (2) and washers from tire and rim (1). Leave three flange nuts (3) attached.

   Note: Flange nuts (3) are on the three mounting studs which are longer than the other mounting studs. Flange nuts (3) should be left on tire and rim (1) to keep tire and rim (1) on the machine until the tire handler is positioned.

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   Illustration 5	g00527346

3. Position a tire handler to support tire and rim (1).

4. Properly support tire and rim (1). Use Tooling (B) (not shown) to remove three flange nuts (2).

5. Use the tire handler to remove tire and rim (1) as a unit. The weight of tire and rim (1) is approximately 3330 kg (7340 lb).

6. Repeat Steps 2 through 4 to remove the right front tire and rim.

Installation Procedure

Note: Before the tires and the rims are installed, thoroughly clean the wheel studs. Remove any paint, debris, or other contaminants.

Note: Refer to the Operation and Maintenance Manual for the correct tire handling recommendations and tire inflation procedures.

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 6	g00527346

1. Use a tire handler to position tire and rim (1) as a unit. The weight of tire and rim (1) is approximately 3330 kg (7340 lb).

2. Face the valve stem outward when tire and rim (1) is being installed.
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   Illustration 7	g00713802

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   Illustration 8	g00500943

3. Use Tooling (B) to install three flange nuts (3) onto the three longest mounting studs. Tighten flange nuts (3) to a torque of 1150 ± 150 N·m (849 ± 111 lb ft).

4. Use Tooling (B) to install 42 nuts (2) and the washers. Tighten 42 nuts (2) to a torque of 1150 ± 150 N·m (849 ± 111 lb ft).

5. Repeat Steps 1 through 4 to install the right tire and rim.
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   Illustration 9	g00500940

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   Illustration 10	g01133390
   Typical Example

6. Remove Tooling (C). Lower Tooling (A) until the weight of the machine is on the front tires and rims.

7. Remove Tooling (A).

End By:

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