ARB RD74 - Manual (Page 14)

3 Installing the Air Locker
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Tap the hole from the outside using ¼”NPT thread tap.
Remove any sharp edges that may chip off from around the hole
and fall into the housing.
Very carefully, remove the rags and inspect with a service light
inside the housing to insure no metal filings are left behind.
3.4 Final Air Locker Assembly
Clean all parts of the differential assembly making sure the O-ring
grooves are free from any contaminants (e.g., dirt, water, metal
fillings, etc.)
Place the Air Locker into the differential housing and install the
bearing caps.
NOTE : Be sure to check that the bearing caps are on the
correct sides of the third member and are correctly
aligned.
Insert the bearing cap bolts and hand tighten.
NOTE : Before attempting to install the adjuster nuts, make
sure the threads on the inside of the bearing caps and
differential housing are perfectly aligned. If they are
not, the threads could be stripped.
Insert and lightly hand tighten the original adjuster nut into the ring
gear side bearing cap.
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 the adjuster nut supplied with the Air Locker kit on the
opposite side of the differential and tighten with 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.