ARB RD84 - Manual (Page 21)

3 Installing the Air Locker
19
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 ‘E’ in Figure 12.
c Insert and hold the Air Locker into the differential housing.
c Insert the shim pack determined earlier as ‘D’ 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 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.)
Figure 13.
c Consult your vehicle manufacturer’s service manual to determine
the carrier bearing pre-load amount specified for your vehicle.
PRE-LOAD + END FLOAT = SHIM PACK
c Add the specified pre-load amount to the measurement taken with
the feeler gauge to determine a shim amount for ‘E’ in Figure 12.
c Create a shim pack ‘E’ from the shims supplied with your Air
Locker.
NOTE : Do not add shims between the bearing cone and the
bearing seat and NEVER machine the Air Locker.