ARB RD100 - Manual (Page 22)

3 Installing the Air Locker
20
3.7 Pre-Load Shimming
In order to pre-load the tapered roller bearings in your Air Locker,
measurements need to be taken so that a value can be calculated for
the shim thickness ‘D’ in Figure 13.
3.7.1 A Pre-Loading an Aluminum Housing
c Grind or cut a notch into the left-hand factory shim as clearance for
the seal housing tube at final assembly. Figure 14. shows the
desired size of the notch.
Figure 14.
c Remove any sharp or protruding edges from around the notch.
c While holding the right-hand bearing cup in place, insert and hold
the Air Locker into the differential housing.
c Insert one of the two master shims from the Air Locker shim kit
between the right-hand bearing cup and the bearing seat of the
axle housing with the rounded edge of the master shim facing away
from the center.
c Insert the shim pack determined earlier as ‘B’ between the bearing
cup (right-hand side) and the master shim.
c Insert the original factory shims in their original positions on both
sides.
c Push (or lightly pry) the Air Locker hard across to the right-hand
side, and measure the maximum gap (also called the ‘end float’)
between the left-hand factory shim and the seal housing with an
automotive feeler gauge. (Fig.15.)