ARB RD40 - Manual (Page 14)

3 Installing the Air Locker
12
3.4 Assembling the Differential Carrier
Place the bearing cups over the bearing cones.
Slide the seal housing into place against the bearing cup (stepped
side out).
NOTE : The grooves in the bearing journal under the seal
housing, will house the O-rings in the final assembly
but they will not be installed now to avoid damage to
the O-rings.
Insert and hold the Air Locker into the differential housing with the
seal housing tube pointing straight out of the housing.
Install one bearing cap on the ring gear side. The bearing cap on
the seal housing side will need to be drilled or slotted as clearance
for the seal housing tube.
Install the bearing cap bolts finger tight.
3.5 Approximating the Backlash for Tube Position
If the backlash is not close enough to the specified amount, the seal
housing tube position cannot be accurately measured to modify the
bearing cap for tube clearance. This must be checked before hand.
Set a depth indicator on one of the ring gear teeth as in figure 6.
Figure 6.