ARB RD138 - Manual (Page 36)

6 Testing & Final Assembly
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c Turn the compressor (or alternate air source) on to charge the air
supply up to its maximum pressure.
c Rotate one wheel by hand.
c The wheel should rotate freely and the opposite wheel should be
turning in the opposite direction without any resistance or
mechanical noise from within the differential.
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 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 add oil if necessary.
c Apply thread sealant to filler plug before inserting.
c Replace the filler plug.
c Clean the differential housing of any oil or grease that may collect
dirt or other abrasive particles.