793F Off-Highway Truck (Command For Hauling) Machine Systems Caterpillar

Installation Procedure

Note: Refer to Disassembly and Assembly, "Duo-Cone Seals - Install".

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Illustration 1	g03831914

1. Install O-ring seal (26). Use Tooling (C) to install Duo - Cone seal (25) onto retainer (24).
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   Illustration 2	g03831913

2. Install retainer (24) onto the brake hub.
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   Illustration 3	g03831911

3. Use Tooling (D) to install Duo - Cone seal (23). Position suitable blocking to support bearing cone (26). Use two people to install bearing cone (22). Carefully remove the suitable blocking to seat bearing cone (22) onto the spindle. The weight of bearing cone (22) is approximately 53 kg (116 lb).

4. Turn over the wheel housing.
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   Illustration 4	g03831909

5. Use Tooling (C) to install Duo - Cone seal (21). Lower the temperature of bearing cup (20). Install bearing cup (20). Use Tooling (C) to install Duo - Cone seal (19).

   Note: Ensure that bearing cup (20) is seated correctly.

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   Illustration 5	g03831901

6. Lower the temperature of bearing cup (18). Install bearing cup (18).

   Note: Ensure that bearing cup (18) is seated correctly.

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   Illustration 6	g03831897

7. Install bearing cone (17). The weight of bearing cone (17) is approximately 32 kg (70 lb).
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   Illustration 7	g03831896

8. Use a suitable lifting device to install spacer ring (16) onto the wheel housing. The weight of spacer ring (16) is approximately 77 kg (170 lb). Use Tooling (A) and a suitable lifting device to install wheel assembly (15). The weight of wheel assembly (15) is approximately 916 kg (2020 lb).

9. "Bearing Preload Procedure - Prefered Method"

   1. Use Tooling (G) to adjust the wheel bearing preload. Refer to Tool Operating Manual, NEHS0920, "Preload Procedure".
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      Illustration 8	g01968130

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      Illustration 9	g02142419

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      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.

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      NOTICE
      Do not use an impact wrench to tighten or loosen the bolts on the bearing preload adjuster. The vibration of an impact tool can damage the digital indicators and/or cause incorrect indicator readings. Always use hand tools to tighten or loosen the bolts on the bearing preload adjuster.

   2. Use a suitable lifting device to position the preload adjuster onto the base plate. The weight of the preload adjuster is approximately 150 kg (330 lb). The weight of the base plate is approximately 191 kg (420 lb).

   3. Lubricate the threads of the bolts. Install the bolts and tighten to a torque of 339 N·m (250 lb ft) in a diagonal pattern by one quarter turn at a time.
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      Illustration 10	g02142422

   4. Set the dial indicators to read zero.
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      Illustration 11	g02142423

   5. Loosen the bolts by one quarter turn at a time in a diagonal pattern. Loosen the bolts until all the bolts are no longer threaded into the base plate.

   6. Clean the threads that are in the spindle. Use a suitable lifting device to install the preload adjuster onto the spindle. The weight of the preload adjuster is approximately 150 kg (330 lb).

   7. Install the bolts. Tighten the bolts to a torque of 339 N·m (250 lb ft) in a diagonal pattern by one quarter turn at a time.

   8. Use Tooling (H) to release the parking brake. Do not exceed 4150 kPa (602 psi).

   9. Rotate the wheel by a minimum of three revolutions.

   10. Record the measurement from each of the dial indicators and average the measurements. Record the average measurement as Dimension (X).

   11. Remove Tooling (H).

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

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       Illustration 12	g02142426

   12. Loosen the bolts by one quarter turn at a time in a diagonal pattern. Remove the bolts. Use a suitable lifting device to remove the preload adjuster. The weight of the preload adjuster is approximately 150 kg (330 lb).
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       Illustration 13	g03831892

   13. Install a number of shims (14) that is equal to Dimension (X). Install retainer (13). Apply Tooling (E) onto bolts (12). Install bolts (12). Tighten bolts (12) to a torque of 530 ± 70 N·m (391 ± 52 lb ft).

10. "Bearing Preload Procedure - Alternate Method"
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    Illustration 14	g03831941

    1. Install retainer (13). Install seven of bolts (12), equally spaced.

       Note: Do not install the shims at this time.

    2. Use Tooling (H) to release the parking brake. Do not exceed 4150 kPa (602 psi).

    3. Tighten bolts (12) to a torque of 50 N·m (37 lb ft) in a cross pattern while rotating the wheel at least three revolutions. Loosen bolts (12). Rotate the wheel three revolutions. The opposite bolts are to be tightened as retightening progresses around the bolts circle, and all bolts must stabilize at the specified torque. Retighten bolts (12) to a torque of 20 N·m (15 lb ft) while rotating the wheel, and then tighten bolts (12) to a torque of 30 ± 5 N·m (22 ± 4 lb ft) while rotating the wheel.
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       Illustration 15	g03831941

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       Illustration 16	g03831957

    4. Use Tooling (J) to measure the distance from the top of the retainer (13) to the end of the spindle at two locations. Average the two measurements and record the result as Dimension (A).

    5. Remove Tooling (H).

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

    6. Remove bolts (12) and retainer (13).

    7. Use Tooling (K) to measure the thickness of retainer (13) at three locations. Average the three measurements. Record the result as Dimension (B). Subtract Dimension (B) from Dimension (A). Record the result as Dimension (C).
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       Illustration 17	g03831892

    8. Install a number of shims (14) that is equal to Dimension (C) minus 0.07 ± 0.03 mm (0.003 ± 0.0012 inch). Install retainer (13). Apply Tooling (E) onto bolts (12). Install bolts (12). Tighten bolts (12) to a torque of 530 ± 70 N·m (391 ± 52 lb ft).
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    Illustration 18	g03831849

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    Illustration 19	g03831885

11. Route harness assembly (11) through the spindle to the retainer plate. Extend harness assembly (11) through the retainer plate with enough length to connect speed sensor assembly (9).

12. Pull harness assembly slack through the spindle. Locate harness assembly (11) in grommet assembly (10) using green tape that is present on the harness assembly. Check that speed sensor assembly (9) is seated before tightening grommet assembly (10). Tightening grommet assembly (10) to a torque of 90 + 9 / - 0 N·m (66 + 7 / - 0 lb ft).
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    Illustration 20	g03831879

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    NOTICE
    Do not install the bolts that secure the speed sensor unless the grommet assembly has been tightened first. Damage to the harness can occur.

13. Position speed sensor assembly (9) and install bolts (8). Tighten bolts (8) to a torque of 12 ± 3 N·m (106 ± 27 lb in).
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    Illustration 21	g01953491

14. Install O-ring seals (7), O-ring seal (6), cover (5), and retainer (4). Apply Tooling (F) onto bolts (3). Install bolts (3). Tighten bolts (3) to a torque of 30 ± 7 N·m (22 ± 5 lb ft).
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    Illustration 22	g02770859

15. Install cover (2). Apply Tooling (E) onto bolts (1). Install bolts (1).

End By:

1. Install the front wheel, brake, and suspension cylinder.