ARB RD129 - Manual (Page 16)

4 Installing the Air Locker
14
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 Assemble one of the two master shims (included with the Air
Locker shim kit) onto the seal housing with the rounded edge of the
shim facing out.
NOTE : No shims other than the master shim should be
assembled onto the seal housing at this time.
c Carefully install the seal housing (master shim towards the
center) 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 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 (ie. End Float) between the end of the
seal housing assembly 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.
c Add the specified pre-load amount to the measurement taken with
the feeler gauge to determine a shim amount for ‘E’ in Figure 6.
PRE-LOAD + END FLOAT = SHIM PACK