ARB RD90 - Manual (Page 29)

3 Installing the Air Locker
27
3.12 A B Checking the Backlash
c Refer to your vehicle manufacturer’s service manual for the
specified maximum and minimum amounts of backlash. If the
backlash measured here is not within the specifications then the
differential will have to be re-shimmed.
3.12.1
A Backlash for Front Access Housing
c Tighten all bearing cap bolts with a torque wrench to the torque
specified in your vehicle manufacturer’s service manual.
c Set a plunge type dial indicator on one of the ring gear teeth as in
Figure 20.
Figure 20.
c While supporting the pinion gear by holding the drive shaft, rotate
the differential in both directions while observing the maximum
variation in depth from the indicator (i.e., the highest value minus
the lowest value). This value is referred to as the ring and pinion
backlash.
c Rotate the differential center 90
°
and measure again for accuracy.
c Record the average of all measurements.
3.12.2 A Re-Shimming the Backlash
NOTE : This step is only necessary when adjusting for
incorrect backlash.
c Remove the bearing caps.
c Remove the shim packs from both ends of differential.