Inspection of Hub Rotation Starting Torque and Wheel Bearing Looseness

INSPECTION

INSPECTION OF HUB ROTATION STARTING TORQUE AND WHEEL BEARING LOOSENESS

Required Special Tools:

- MB990998: Front Hub Remover and Installer
- MB991000: Spacer
- MB990326: Preload Socket
- MB990685: Torque Wrench





1. Install special tools MB990998 and MB991000 to the hub and tighten to the specified torque.
Tightening torque: 144 -176Nm (107 - 129 ft-lb)
2. Fix the hub in a vice using a piece of wood or the like.
3. Rotate the hub to make the bearing well-greased.





4. Use special tools MB990326 and MB990685 to measure the hub rotation starting torque.
Limit: 1.4Nm (12.4 in-lb)
5. If the rotation starting torque is not within the limit range, replace the rear wheel hub assembly. If there is any signs of binding or tight spots when the wheel bearing turns, also replace it.





6. Set a dial gauge, and move the hub in the axial direction to measure the looseness in the wheel bearing.
Limit: 0.05 mm (0.002 inch)
7. If the wheel bearing looseness at the specified tightening torque 144 - 176 Nm (107 - 129 ft-lb) exceeds the limit, replace the rear wheel hub assembly.