ARB RD119 - Manual (Page 16)

3 Installing the Air Locker
14
NOTE : You should feel no backlash between the ring and
pinion gears once the adjuster nut tightens.
Reverse the adjuster nut (counterclockwise) ¼ turn.
Insert one of the original adjuster nuts into the bearing cap on the
opposite side and hand tighten using the appropriate adjuster nut
wrench.
NOTE : You should now feel some backlash between the
ring and pinion gears. If not, there might be a
clearance problem which is binding the carrier. Re-
check the clearance.