ARB RD129 - Manual (Page 23)

4 Installing the Air Locker
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c Check that no part of the seal housing tube comes in contact with
the moving differential components. 10mm [3/8”] should be
considered adequate clearance. Gently bend the tube away from
moving parts if necessary.
4.11 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 (ARB part # ALTG01).
Once 620 KPA [90 PSI] is reached close the valve,
disconnect the air hose, and watch to see if there is any
drop in pressure. If so, this will indicate an air leak.
(Fig.13.)
Figure 13.
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.