ARB RD94 - Manual (Page 25)

4 Installing the Air Locker
23
4.10 Bench Testing the Air Locker
c To test the Air Locker; when 620kPa [90 PSI] shop air is applied to
the seal housing tube, the Air Locker should engage.
c Check all fittings and the seal housing for air leaks.
c Rotate the differential carrier by turning the pinion flange whilst
applying air pressure.
NOTE : An accurate way to test for air leaks is to fit a shut-off
valve to an air pressure gauge, once 620 KPA [90 PSI]
is reached shut the valve off, disconnect the air hose,
and watch to see if there is any drop in pressure, if so,
this will indicate an air leak. (Fig.
16. )
Figure 16.
c If a leak is found to be present, spray a soap and water mixture
onto the bulkhead air fitting. Bubbles should appear at any leak
points.
NOTE : Do not spray this soapy mixture inside the differential.
c Check that leaky fittings have been adequately tightened.
c Disassemble, clean threads, and reapply thread sealant if leaking
persists.
c If a leak is found at the seal housing, remove the Air Locker and
carefully remove the seal housing assembly, and examine the O-
rings. Be very careful with the O-rings and check for defects,
damage, wear, or presence of foreign material in the O-ring
grooves. Replace if necessary.