INSPECTION



INSPECTION OF HUB ROTATION STARTING TORQUE AND WHEEL BEARING LOOSENESS



1.Install the following special tools to the hub and tighten to the specified torque.

  • Front hub remover and installer (MB990998)
  • Spacer (MB991000)
Tightening torque: 270 ± 27 N·m
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 the following special tools to measure the hub rotation starting torque.

  • Preload socket (MB990326)
  • Torque wrench (MB990685)
Limit: 1.4 N·m
5.If the hub rotation starting torque at the specified tightening torque (270 ± 27 N·m) exceeds the limit, 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 looseness in the wheel bearing.
Limit: 0.05 mm
7.If the wheel bearing looseness at the specified tightening torque (270 ± 27 N·m) exceeds the limit, replace the hub.