ARB RD147 - Manual (Page 20)

3 Installing the Air Locker
18
Carefully install the seal housing (ARB master shim towards the
center) by sliding it all of the way onto the bearing journal with a
gentle twisting motion. This will allow the O-rings to engage gently.
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 9.
IMPORTANT NOTE FOR OE MASTER SHIM TYPE
DANA 44 SETUP:
Grind or cut a notch into the left-hand factory shim as clearance for the
seal housing tube at final assembly, as per Figure 10.
Insert the right hand OE master shim between the ARB master shim
and the axle housing, and the left hand OE master shim between the
seal housing and the axle housing making sure to align the notch with
the notch in the axle housing and the seal housing tube.
All pre-load measurements and any required shimming should be
made between the seal housing and the left hand OE master shim.
Figure 10.
Insert and hold the Air Locker into the differential housing.
Insert the remaining ARB master shim 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 ARB master shim facing
away from the center.
Insert the shim pack determined earlier as ‘B’ between the bearing
cup (right-hand side) and the ARB master shim.
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 outside of the seal housing and the inside face of the
axle housing with an automotive feeler gauge. (Fig.11.)