Wheel Hub: Testing and Inspection
INSPECTIONHUB ROTATION STARTING TORQUE AND WHEEL BEARING END PLAY CHECK
Required Special Tools:
^ MB990326: Preload Socket
^ MB990998: Front Hub Remover and Installer
^ MB991000: Spacer
1. Tighten special tools MB990998 and MB991000 to the specified torque.
Tightening torque: 144 - 176 Nm (107 - 129 ft-lb)
2. Fix the hub in a vice using a piece of wood or the like.
3. Rotate the rear hub in order to seat the bearing.
4. Use special tool MB990326 to measure the hub rotation starting torque.
Limit value: 1.4 Nm (1.03 ft-lb)
5. If the hub rotation starting torque at the specified tightening torque [144 - 176 Nm (107 - 129 ft-lb)] exceeds the limit value, replace the hub. If there are rough or gritty feelings in rotation, replace the hub.
6. Set a dial gauge, and move the hub in the axial direction to measure the wheel bearing end play.
Limit: 0.05 mm (0.002 inch)
7. If the wheel bearing end play at the specified tightening torque [144 - 176 Nm (107 - 129 ft-lb)] exceeds the limit value, replace the hub.