ARB RD125 - Manual (Page 20)

3 Installing the Air Locker
18
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 12.
c Insert and hold the Air Locker into the differential housing.
IMPORTANT:
Some Dana 35 pinion gears extend so far into the differential
cavity that they make contact with the body of the Air Locker.
If this is the case then the end of the pinion gear will have to
be carefully ground or machined away until at least 0.5mm
[0.020”] of clearance exists. This will not adversely effect the
strength of the pinion gear.
Clean all grinding particles from the pinion gear & differential
housing after modifications.
NEVER MODIFY THE AIR LOCKER TO CREATE CLEARANCE.
c Insert the remaining 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 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 master shim from the right-hand side of the
original differential back into the housing between the Air Locker
master shim and the bearing seat of the axle housing.
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 outside of the seal housing and the inside face of the
axle housing with an automotive feeler gauge. (Fig.13.)