ARB RD94 - Manual (Page 10)

3 Bench Measurement
8
3.1 Measurement for Pre-Load Shimming
When fitting an ARB Air Locker, the original bearing types are used on
both sides of the Air Locker, however, in order to reproduce a similar
backlash and pre-load to that of your existing differential,
measurements need to be taken so that the correct shim thickness
can be determined for each side.
c Secure the differential to a workbench.
c Remove the bolts that hold the ring gear in place.
c Using a plastic or copper hammer, tap in a circle around the ring
gear to separate it from the differential carrier.
c Remove the original tapered roller bearings and shims from the
differential carrier using a bearing puller. (Fig 3.)
NOTE : Keep the shims separated so that they can be
identified as to which end of the differential they came
from.
Figure 3.
HINT : Check the condition of the bearing for wear and
replace if necessary.
c Using a calliper or similarly accurate measurement method
(i.e., able to take accurate measurements within 0.04mm [0.0015”]),
measure the distance from the bearing shoulder to the ring gear
mounting face (shown as ‘A’ in Figure 4.) and record this
measurement as ‘A’.