2002/11/18 Caterpillar

Articulated Truck:

D250B (S/N: 5WD1-UP)

D300B (S/N: 4SD1-UP)

Reference: Service Magazine, SEPD0656, "Correction to Disassembly and Assembly, "Wheel Bearings and Duo-Cone Seals - Install""

Reference: Service Magazine, SEPD0656, "A New Hardened Hub and a New Hardened Adjusting Ring Are Used in Final Drives for Ensuring Wheel Bearing Preload"

Reference: Service Magazine, SEPD0656, "Bearings Are Available for Wheels in Severe Applications"

Note: There is no Caterpillar disassembly and assembly procedure that is available for the power train on the listed machines.

This procedure is used for machines that have the hardened hub and the hardened adjusting ring as well as the standard hub and the ring.

Installation Procedure

Note: Make sure that the machine is properly supported in order to install the wheels. See Operation and Maintenance, "Jacking Locations".

Show/hide table



Illustration 1	g00519811

1. Make sure that the rubber toric seals are clean and dry. Make sure that all metal surfaces that make contact with the rubber toric seals are clean and dry. Use Tooling (A) in order to install the Duo-Cone seal (1) in the retainer. Put a small amount of clean oil on the metal surfaces that make contact.

Show/hide table



Illustration 2	g00519813

2. Install cone (2) on the spindle. Lightly oil the cone.

Show/hide table



Illustration 3	g00519816

3. Lower the temperature of cup (3). Install cup (3) in the wheel assembly.

Show/hide table



Illustration 4	g00519817

4. Lower the temperature of cup (4). Install cup (4) in the wheel assembly.

Show/hide table



Illustration 5	g00519820

5. Install brake disc (5) with twenty-four bolts and washers. Tighten the bolts to 250 ± 25 N·m (185 ± 18 lb ft) and turn the bolts by an additional 60 degrees ± 5 degrees.

6. Make sure that the rubber toric seals are clean and dry. Make sure that all metal surfaces that make contact with the rubber toric seals are clean and dry. Use Tooling (A) in order to install the Duo-Cone seal (6) in the retainer. Put a small amount of clean oil on the metal surfaces that make contact.

Show/hide table



Illustration 6	g00519822

7. Install cone (7) on the hub assembly.

Show/hide table



Illustration 7	g00519824

8. Use Tooling (B) and a press in order to install bushing (8) in the hub assembly.

   Note: The bushing (8) must be pressed below the face of the hub assembly.

Show/hide table



Illustration 8	g00519825

9. Use Tooling (C) in order to attach a suitable hoist to wheel assembly (9). Wheel assembly (9) has a weight of approximately 90 kg (200 lb).

10. Place wheel assembly (9) on the spindle.

Show/hide table



Illustration 9	g00519942

11. Install hub assembly (10) on the spindle. Lightly oil the cone.

12. Install adjusting ring (11) that holds hub assembly (10) on the spindle.

Show/hide table



Illustration 10	g00519827

13. Thread a nut fully onto a stud and install Tooling (E) on the nut. The centerline of tooling (E) must be in line with the centerline of the wheel. Rotate the wheel several times in order to seat the bearings. Tooling (E) will be used in order to check the rolling torque of the wheel. Always rotate the wheel in the same direction throughout the procedure.

    When you rotate the wheel, use Tooling (D) and Tooling (F) in order to tighten adjusting ring (11) to 600 N·m (440 lb ft). This will seat the bearings and this will keep the rollers parallel to each other at the same location on the cone. All wheel rotation must be in the same direction.

    Loosen adjusting ring (11) to a zero reading on the torque wrench. This step is performed in order to relieve preload in the bearings without introducing end play. Rotate the wheel for two or more revolutions. Do not loosen adjusting ring (11) too much. Measure the rolling torque due to the drag of the Duo-Cone seals with the torque wrench (E). This is torque (G) .

14. Calculate the total rolling torque (TRT) that is measured when the bearing adjustment is correct by adding torque (G) to the additional torque (T) that is required to provide the correct bearing preload. The additional torque (T) that is required is 7.1 ± 1.8 N·m (63 ± 16 lb in). Use this value for torque (T) for new bearings when you use Tooling (E) .. Tighten adjusting ring (11) while rotating the wheel assembly until the total rolling torque (TRT) is equal to torque (G) plus torque (T) .

    Note: (TRT) = (G) + (T)

    Example

    • The torque (G) that is due to the drag of the Duo-Cone seals is 2.6 N·m (23 lb in) according to Tooling (E) .

    • The additional torque (T) that is required to provide the correct bearing preload is 7.1 ± 1.8 N·m (63 ± 16 lb in) for new bearings.

    • The total rolling torque (TRT) must be 9.7 ± 1.8 N·m (86 ± 16 lb in).

Show/hide table



Illustration 11	g00519828

15. Install lock (12) on adjusting ring (11). Invert the lock if it is necessary. Use the nearest locking position. Loosen or tighten adjusting ring (11) by the minimum amount of torque that is necessary in order to align the holes in the lock with the holes in the hub.

    Install the four bolts (13) and the washers that hold the lock.

16. Check the total rolling torque (TRT) while you rotate the wheel in the same direction that was used in the previous steps.

17. If necessary, readjust the bearings in order to establish the correct total rolling torque.

Adjust the additional torque that is required in order to provide the correct bearing preload if you use a different torque wrench. Use the following equation in order to calculate the adjusted value for the additional torque (T1) .

T1 = (H × TO) ÷ (H + J)

T1 - The adjusted value for the additional torque that is required to provide the correct bearing preload

H - The distance in millimeters from the center of the drive on the torque wrench to the turning force

J - The distance in millimeters from the center of the wheel to the center of the wheel stud

TO - A fixed value that depends on the application

Note: The value (TO) is 16 ± 4 N·m (142 ± 35 lb in) for this application.

Note: You must use the same torque wrench to measure the torque (G) and the total rolling torque (TRT) .

End By:

a. Install the final drive planetary carriers and the ring gears. See Disassembly and Assembly, "Final Drive - Install".

b. Install the brake caliper assembly. See Disassembly and Assembly, "Service Brakes - Install".

c. Install the tire and rim. See Disassembly and Assembly, "Tire and Rim - Install".