- Articulated Truck:
- D250E Series II (PIN: 4PS1-UP)
Reference: Service Manual Module, SENR9128, "Disassembly and Assembly D250E Series II and D300E Series II Articulated Truck Power Train", "Wheel Bearings and Duo-Cone Seals - Install; Installation Procedure" The Wheel Bearing Adjustment Procedure is incorrect. Replace Steps 13 through 16 with the following procedure:
- Screw a nut fully onto a stud and install a 203 mm (8.0 inch) torque wrench (E) on the nut. The torque wrench MUST be in line with the center of the wheel. Rotate the wheel several times in order to seat the bearing rollers against the cone back face rib. This wrench (E) will be used in order to check the rolling torque of the wheel.
Rotate the wheel and tighten adjusting nut (11) to a torque of 600 N·m (442 lb ft) in order to seat the bearings. This method keeps the rollers parallel to each other and at the same location on the cone ramp. All wheel rotation must be in the same direction.
Loosen adjusting nut (11) until the adjusting nut is hand tight. Take care not to loosen the adjusting nut too much.
Rotate the wheel in the same direction through two or more revolutions. Measure the rolling torque. Value (D) is the rolling torque due to Duo-cone seal drag. This will be used below.
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| Illustration 1 | g00519827 |
- If a 203 mm (8.0 inch) torque wrench is used, the correct value for rolling torque due to wheel bearing preload (T) is 5.3 N·m (46.9 lb in) for new bearings. For used bearings, the rolling torque due to wheel bearing preload is 3.2 N·m (28.3 lb in). Use the following formula in order to calculate the correct value for rolling torque due to wheel bearing preload, if a different torque wrench is used :
T = (A x TO) / (A + B)
Value (A) is the length of the torque wrench in millimeters.
Value (TO) is the rolling torque that is due to the preload on the bearing. The torque is measured from the center of the wheel. The value in this procedure is 12 N·m (106.2 lb in) for new bearings. For used bearings, the value is 7 N·m (61.9 lb in).
Value (B) is the distance from the center of the wheel to the center of the stud. The value in this procedure is 257.5 mm (10.14 inch).
Value (T) is the correct value for the rolling torque due to wheel bearing preload. The torque is measured from the location of the stud. The torque is measured by using a torque wrench with a length (A) .
Note: Use the same torque wrench to measure both the rolling torque due to seal drag and the total rolling torque.
Rotate the wheel in the same direction as Step 13 and tighten adjusting nut (11) until the rolling torque due to bearing preload is between 5.3 N·m (46.9 lb in) and 8.8 N·m (77.9 lb in) for new bearings, or between 3.2 N·m (28.3224 lb in) and 7 N·m (61.9 lb in) for used bearings.
The rolling torque due to bearing preload is calculated by subtracting the bearing preload due to drag of the duo-cone seals (D) from the value for the total rolling torque.
- Install lock (12) onto adjusting nut (11). It may be necessary to invert the lock in order to align the bolt holes with the holes in the hub. Check the total rolling torque. The total rolling torque should be between 5.3 N·m (46.9 lb in) and 8.8 N·m (77.9 lb in) for new bearings or between 3.2 N·m (28.3224 lb in) and 7 N·m (61.9 lb in) for used bearings.
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| Illustration 2 | g00519828 |
- Install four bolts (13), and the four washers that hold the lock.