793C Off-Highway Truck Machine Systems Caterpillar

Installation Procedure

Note: The following steps are for the installation of the front wheel bearings. In the photos, the front suspension cylinder, the spindle, and the brake assembly are removed from the truck.

Note: The Duo-Cone seals must be installed properly. Refer to Disassembly and Assembly, "Duo-Cone Seals - Install" for the correct procedure.

Note: Before the assembly, inspect the following components for wear or for damage: cups of the wheel bearing, cones of the wheel bearing, the Duo-cone seal kits, the O-ring seals, the seal rings and the rubber toric rings. If necessary, replace any of the components.

Show/hide table



Illustration 1	g00589508

1. Use Tooling (B) and a suitable lifting device in order to install the front suspension cylinder, the spindle, and the brake assembly on Tooling (F) .

   Note: The above photo shows the front suspension cylinder and the spindle assembly before the installation of the brake assembly. This photo is out of the sequence. This photo illustrates the use of Tooling (F) .

Show/hide table



Illustration 2	g00477367

2. Use Tooling (E) in order to install the first half of seal (19) on the retainer.

Note: Seals (21) and (22) must be installed correctly. Brake cooling oil will leak into the front wheel if the seals are incorrectly installed.

Show/hide table

NOTICE
Failure to follow the recommended procedure or the specified tooling that is required for the procedure could result in damage to components. To avoid component damage, follow the recommended procedure using the recommended tools.

Note: The following illustrations show the correct installation and the incorrect installation of seals (21) and (22). Install seal ring (L) on retainer (I) so that yellow side (K) faces outward. This orientation is required in order to achieve the necessary seal face load on ring seal (J).

Show/hide table



Illustration 3	g00477373
Incorrectly installed seal assembly

Show/hide table



Illustration 4	g00477376
Correctly installed seal assembly

3. Install seal ring (22) in the brake hub. Install ring seal (21). Lubricate the installed seals with clean hydraulic oil.

4. Use Tooling (D) in order to install the first half of seal (14) on the service and parking brake assembly.

Show/hide table



Illustration 5	g00477440

5. Use Tooling (E) in order to install the remaining half of seal (19) on retainer (17) .

Show/hide table



Illustration 6	g00477444

Show/hide table



Illustration 7	g00477458

6. Install O-ring seal (18) on retainer (17) .

7. Apply 1U-6396 O-Ring Assembly Compound to O-ring seal (18) .

Show/hide table



Illustration 8	g00477459

Show/hide table



Illustration 9	g00477482

Show/hide table



Illustration 10	g00477490

8. Apply 1U-6396 O-Ring Assembly Compound to the spindle. Install retainer assembly (17) .

Show/hide table



Illustration 11	g00477492

9. Install bearing cone (16) .

Show/hide table



Illustration 12	g00477495

10. Lower the temperature of bearing cup (15) to −45°C (−49.0°F). Install bearing cup (15) in the outside of the front wheel assembly. Be certain that bearing cup (15) is properly seated in the step bore of front wheel assembly (1) .

Show/hide table



Illustration 13	g00477496

11. Lower the temperature of bearing cup (13) to −45°C (−49.0°F). Install bearing cup (13) in the outside of the front wheel assembly. Be certain that bearing cup (13) is properly seated in the step bore of front wheel assembly (1) .

12. Use Tooling (D) in order to install the remaining half of seal (14) on wheel assembly (1) .

Show/hide table



Illustration 14	g00477653

13. Use Tooling (B) and a suitable hoist in order to install wheel assembly (1) .

Show/hide table



Illustration 15	g00477654

14. Install bearing cone (12). Seat bearing cone (12) against the bearing cup.

Show/hide table



Illustration 16	g00477656

15. Position retainer (10). Install seven bolts (9), equally spaced.

16. The following procedure is used to determine the thickness of shims (11) between the spindle and the retainer.
    Show/hide table
    
    

    Illustration 17	g00477658

    Show/hide table
    
    

    Illustration 18	g00477665

    1. Use Tooling (A) to release the parking brake.

    Show/hide table

    NOTICE
    If it becomes necessary to use an outside hydraulic source to release the parking brake, do not exceed the relief pressure of the parking and secondary brake control valve. Exceeding the relief pressure can damage seals and other parts in the circuit.

    2. Tighten the retainer bolts (9) to a torque of 50 N·m (36.9 lb ft)in a cross pattern.

    3. Rotate the wheel three times. Tighten retainer bolts (9) in a cross pattern to a torque of 30 ± 5 N·m (22.1 ± 3.7 lb ft). Repeat until bolts stabilize at the specified torque.
    Show/hide table
    
    

    Illustration 19	g00997698

    4. Use Tooling (G) in order to determine dimension (M). Dimension (M) is the distance from the outside face of the retainer to the end of the spindle. Measure the distance from the two holes that are opposite each other. Average the measurements.
    Show/hide table
    
    

    Illustration 20	g00997701

    Show/hide table

    NOTICE
    Failure to follow the recommended procedure or the specified tooling that is required for the procedure could result in damage to components. To avoid component damage, follow the recommended procedure using the recommended tools.

    Note: Relieve the pressure in the parking brake before Tooling (A) is removed. Failure to remove the pressure could result in injury or death to personnel in the area.

    5. Remove Tooling (A) .

    6. Remove retaining plate (10) and retaining bolts (9). Use Tooling (G) in order to determine dimension (N). Dimension (N) is the thickness of the retainer at the bolt holes. Measure the thickness of the retaining plate at two locations that are opposite each other. Average the measurements.

    7. Subtract average dimension (N) from average dimension (M). This amount is the average gap that is between the inside face of the retainer and the end of the spindle.

    8. Calculate the required thickness of the shims. Shims (11) must equal the gap that was calculated in Step 16.f minus .07 ± .03 mm (0.003 ± 0.001 inch).
    Show/hide table
    
    

    Illustration 21	g00478221

    9. Use the Tooling (H) to assemble shims (11). The thickness of shims (11) should be equal to the thickness that was calculated in 16.h.

    10. Apply 9S-3263 Thread Lock Compound to the threads of bolts (9). Install retainer bolts (9). Tighten bolts (9) to a torque of 530 ± 70 N·m (390.9 ± 51.6 lb ft) in a cross pattern. All the bolts must stabilize at the specified torque.

Show/hide table



Illustration 22	g00478262

17. Use 1U-6396 O-Ring Assembly Compound in order to assemble O-ring seal (8) to cover (7) .

Show/hide table



Illustration 23	g00478263

18. Apply 9S-3263 Thread Lock Compound to the thread of bolts (6). Use 12 bolts (6) and the 12 washers in order to install cover assembly (7). Tighten bolts (6) to a torque of 100 ± 20 N·m (73.76 ± 14.75 lb ft).

19. Install gasket (3) and plug (2) .

20. Fill the front wheel with oil to the correct level. For the fluid capacities and the proper filling procedures, refer to Operation and Maintenance Manual.

21. Install gasket (5) and plug (4) .

End By: Install the front tires and rims. Refer to Disassembly and Assembly, " Tire and Rim (Front) - Remove and Install" for the correct procedure.