5.1 Leak Testing
With the vehicle parked and the engine off, turn the compressor on and wait until the air
system is fully charged.
The compressor should not come on again for a period of at least 15min. Air system
recharging within that time period would indicate that a leak is present in the system.
If a leak is found to be present, spray a soap and water mixture onto all air fittings in the
system while the compressor is fully charged. Bubbles should appear at any leak points.
Check that leaky fittings have been adequately tightened.
If leaking persists then disassemble fittings, clean threads, and reapply thread sealant /
tape.
5.2 Testing the Air Locker Actuation (Air Locker Systems Only)
To test that the air system, electrical system, and the Air Locker differential is functioning
correctly:
Support the vehicle such that the wheels are free to rotate (e.g., on axle stands, a
chassis hoist, etc.)
Leave the parking brake off, the transmission in neutral, and the Air Locker switch ‘OFF’.
Turn the ignition to the ‘ON’ position (leaving the motor off). The large symbol on the Air
Locker switch cover should not be illuminated.
Turn the compressor on to charge the air supply to maximum pressure.
While supporting the drive shaft flange, rotate one wheel by hand.
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.
Turn the Air Locker switch to the ‘ON’ position. The symbol on the switch cover should
light up.
Rotate the same wheel again and check that both wheel rotate together.
Turn the switch off again.
Rotate the same wheel again.
The wheels should again rotate in opposite directions.
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