ARB RD137 - Manual (Page 23)

4 Installing the Air Locker
21
NOTE : Excessive tightening of the center compression nut is
not necessary to form a good seal around the tube
and may damage the O-ring, the seal housing tube, or
the threads of the compression nut.
NOTE : Make sure the seal housing tube is all of the way into
the center compression nut while you are tightening
it.
c Again 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.15.)
Figure 15.
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.