ARB RD40 - Manual (Page 19)

3 Installing the Air Locker
17
3.8 Final Air Locker Assembly
Remove the seal housing and clean all parts of the differential
assembly. It is very important to make sure the bearing journal
grooves are free from any contaminants (eg: water, dirt, metal
fillings, etc.)
Lubricate the O-rings with oil (prior to assembly), then stretch them
over the bearing journal and release them into the grooves.
NOTE : Do not roll the O-rings onto the seal housing as this
will damage them.
Place the bearing cups onto their respective bearing cones.
Install the seal housing over the O-rings by gently applying a
downward twisting motion. This will allow the O-rings to gently
engage.
Point the seal housing tube straight out of the housing, hold the
tapered roller bearing cups in place, and insert and hold the Air
Locker into the differential housing.
Install the bearing cap on the ring gear side.
Check to see if the bearing cap on the seal housing side fits over
the tube without fouling.
NOTE : Do not forget to check the bearing caps are turned the
correct way around.
Install all bearing cap bolts and hand tighten.
3.9 Checking the Backlash
Set a depth indicator on one of the ring gear teeth (Fig.12.).
While supporting the pinion gear by holding the drive shaft flange,
rotate the differential in both directions while observing the
maximum variation in depth from the indicator (i.e., the highest
value minus the lowest value). This value is referred to as the ring
and pinion backlash.
Rotate the differential center 90
° and measure again for accuracy.
Refer to your vehicle service manual for the specified maximum
and minimum amounts of backlash.