ARB RD12 - Manual (Page 18)

4 Installing the Air Locker
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c Holding the seal housing and tapered roller bearing cup in place at
each end, insert and hold the Air Locker into the differential housing
with the seal housing tube pointing straight out of the housing.
c Install one bearing cap on the ring gear side. The bearing cap on
the seal housing side will need to be drilled or slotted as clearance
for the seal housing tube.
c Install the bearing cap bolts finger tight.
c Push the Air Locker hard across to the ring gear side, and measure
the gap (end float) between the seal housing and the bearing seat
of the axle housing with a feeler gauge.
c Consult your vehicle manufacturer’s service manual to determine
the carrier bearing pre-load amount specified for your vehicle.
c Add the specified pre-load amount to the measurement taken with
the feeler gauge to determine a shim amount for ‘E’ in Figure 8.
PRE-LOAD + END FLOAT = SHIM PACK
c Select suitable shims from the supplied shim kit to make up a shim
pack of this thickness.
c Remove the Air Locker and assemble the shim pack onto the seal
housing spigot behind the master shim (Figure 8.).
c Spread the differential housing again (Refer to section 2.6).
NOTE : If the carrier is too difficult to install with the added
shim pack then the spreader tension may need to be
increased. Do not spread the housing more than
0.50mm [0.020”].
c Reinstall the Air Locker as before (i.e., with only one bearing cap).
c Release all spreader tension.
4.5 Approximating the Backlash for Tube Position
If the backlash is not close enough to the specified amount, the tube
position cannot be accurately measured to modify the bearing cap for
tube clearance. This must be checked before hand.