ARB RD84 - Manual (Page 22)

3 Installing the Air Locker
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c Remove the Air Locker from the axle housing.
c Install the shim pack ‘E’ between the master shim and the seal
housing as shown in Figure 12.
c Spread the differential housing again (Refer to Section 2.6).
c Re-install the Air Locker assembly into the axle housing without the
shim pack from the right-hand side.
c Rotate the seal housing until the tube is positioned in the center of
the oil drainage notch of the axle housing.
c While holding the Air Locker into the axle housing, lightly tap the
right-hand shim pack into place on the right-hand side between the
bearing cup and the bearing seat of the axle assembly. (Refer to
Figure 14.)
Figure 14.
NOTE : If the shim pack is too tight to fully install then the
spreader tension may need to be increased. Do not
spread the housing more than 0.50mm [0.020”].
c Release all spreader tension.
c Check that some backlash can be felt between the ring and pinion
gears. No backlash would be an early indication of incorrect shim
thickness.