ARB RD44 - Manual (Page 12)

3 Bench Measurement
10
3.1 Measurement for Pre-Load Shimming
When fitting this ARB Air Locker, the original carrier bearings will be
re-used on both sides of the differential. A variable shim pack
(supplied) will be used on the right hand side (opposite the ring gear)
in order to achieve the correct ring and pinion backlash and carrier
bearing pre-load once the Air Locker has been installed. Because of
this, the original shims from this side will not be reused.
The original shim type is commonly reused on the left hand (ring gear)
side of the Air Locker (see diagram next page), 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 this side.
c Secure the differential to a work bench.
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 bearings and shims from the differential carrier
using a bearing puller.
NOTE : Keep the shims and bearings separated so that they
can be identified as to which end of the differential
they came from.
c Using a caliper 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’.
c Measure the thickness of the shim pack removed from the ring gear
side of the differential carrier (shown as ‘B’ in Figure 4.).and record
this measurement as ‘B’.
c Measure the distance from the Air Locker bearing shoulder to the
ring gear mounting face (shown as ‘C’ in Figure 5.) and record this
measurement as ‘C’.