ARB RD139 - Manual (Page 20)

3 Installing the Air Locker
18
3.8 Bench Testing the Air Locker
! To test the Air Locker, when 620kPa [90 PSI] shop air is applied to
the seal housing tube, the Air Locker should engage.
! Check all fittings and the seal housing for air leaks.
! 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 (Available as ARB part
#ALTG01). Charge with shop air until 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. Any
gradual pressure drop indicates an air leak. (Fig.13.)
Figure 13.
! 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.
! Check that leaky fittings have been adequately tightened.
! Disassemble, clean threads, and reapply thread sealant if leaking
persists.
! If a leak is found at the seal housing, carefully remove and refit. Be
very careful with the O-rings and check they have not been
damaged during installation.