ARB RD137 - Manual (Page 16)

4 Installing the Air Locker
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c Generously lubricate the O-rings with oil prior to assembly, then
insert them into the grooves of the seal housing.
NOTE : When assembling the O-rings, be careful not to leave
them twisted when seated in the grooves as this could
cause excessive wear and leakage.
c Lubricate the seal housing running surface on the Air Locker carrier
with oil. Assemble the bearing cup onto the left-hand side of the Air
Locker.
c Carefully install the seal housing by sliding it all of the way onto the
bearing journal with a gentle twisting motion. This will allow the O-
rings to engage gently.
4.4 Calculation & Selection of Pre-Load Shims
In order to pre-load the tapered roller bearings in your Air Locker,
measurements need to be taken so that a value can be calculated for
the shim thickness ‘E’ in Figure 6.
c Grind or cut a notch into the left-hand factory shim as clearance for
the seal housing tube at final assembly. Figure 7. shows the
desired size of the notch.
Figure 7.
c Remove any sharp or protruding edges from around the notch.
c Hold the bearing cup and shim pack ‘D’ (Fig.5.) in place, and insert
the Air Locker into the housing.
c Push the Air Locker hard across against the bearing and shim pack
‘D’, and measure the gap between the end of the notched master
shim and the bearing seat of the differential 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.