ARB RD121 - Manual (Page 24)

3 Installing the Air Locker
22
3.12.1 Re-Shimming the Backlash
NOTE : This step is only necessary when adjusting for
incorrect backlash.
c Remove the bolts from the clamshell housing.
c With the shallow half of the clamshell sitting firmly on a horizontal
surface, lift off the deep half of the clamshell.
c Gently lift the Air Locker straight upward out of the seal housing in
the shallow half of the clamshell.
c Remove the center compression nut from the bulkhead fitting.
(Fig.12.)
c Pull the seal housing tube free of the bulkhead fitting.
NOTE : This may require rotating the seal housing slightly.
c Using an arbor press or bearing press, press out the seal housing
assembly and the bearing cup from the deep half of the clamshell.
c To decrease the amount of backlash, reduce the shim thickness ‘D’
(Fig.3.) and increase the shim thickness ‘E’ (Fig.5.) by the same
amount. Reverse this step to increase the backlash.
c Reinstall the Air Locker into the differential assembly.
c Check backlash again as before.