3 installing the air locker, Re-shimming the backlash, Setting up the bulkhead fitting – ARB RD83 User Manual
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3 Installing the Air Locker
23
3.9.1
Re-Shimming the Backlash
NOTE :
This step is only necessary when adjusting for 
incorrect backlash. 
c Remove the bearing caps. 
c Remove the differential as before. 
c To decrease the amount of backlash, reduce the shim thickness ‘D’ 
(Fig.10.) and increase the shim thickness ‘E’ (Fig.12.) by the same 
amount. Reverse this step to increase the backlash. 
c Remount the differential as before. 
c Release spreader tension (if applicable). 
c Check backlash again as before. 
3.10
Setting Up the Bulkhead Fitting
c Apply thread sealant to the threads of the bulkhead body. 
c Screw the bulkhead body into the tapped hole, and tighten. 
c Wipe the area clean of any excess thread sealant (inside and 
outside of the housing).
c Pre-bend the seal housing tube so that it roughly resembles the
finished shape and has a tight bend in the very end where it enters 
the bulkhead fitting. Refer to Figure 17. 
Figure 17.
