ARB RD90 - Manual (Page 43)

6 Testing & Final Assembly
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c Turn the Air Locker switch to the ‘ON’ position. The illuminated
symbol on the switch cover should light up.
c Rotate the same wheel again.
c Both wheels should rotate together.
c Turn the switch off again.
c Rotate the same wheel.
c The wheels should again rotate in opposite directions.
6.3 Re-Sealing & Filling the Differential
NOTE : Consult the ARB Air Locker Operating & Service
Manual for recommendations on differential lubricant
specifications.
c Refill the differential until level with the filler hole.
c Rotate the differential center 2 full turns.
c Check the oil level and refill if necessary.
c Replace filler plug (apply thread sealant to filler plug before
inserting if it is a threaded type plug).
c Wipe differential housing clean of any oil or grease which may
collect dirt or other abrasive particles.
6.4 Note For ADD Equipped Vehicles
IMPORTANT :
IFS vehicles equipped with Automatic Differential Disconnect (ADD)
do not disconnect both wheels from the differential. Because of this,
the internal gears of the differential of all ADD vehicles are in
constant motion when moving in two wheel drive. For this reason,
the front Air Locker in an ADD equipped vehicle must never be
engaged while moving in two wheel drive, as doing so would
cause any motion in the internal differential gears to be instantly
transferred to your ring and pinion set, potentially causing extensive
damage to your ring and pinion gears, your CV joints, and to your
Air Locker differential. To eliminate this problem, save wear on your
differential components, prolong the life of your CV joints, and
increase your fuel mileage, ARB recommends that you eliminate the
drag and wear in your front driveline components (which are not
even being used in 2WD) by installing manual locking hubs,
especially if your vehicle is used for extensive two wheel driving.