L322 Range Rover System Description and Operation
SUSPENSION
DESCRIPTION AND OPERATION
60-11
Air Supply Unit
1 Electric motor
2 Compressor
3 Compressor temperature sensor
4 Electrical and air supply connectors
5 High pressure exhaust valve
6 Rubber mounting (3 off)
7 Exhaust hose
8 Exhaust pilot valve
The air supply unit is located in a sealed housing which is mounted in the spare wheel well. The unit is secured with
four bolts into threaded inserts in the vehicle floorpan. The unit is connected to the system via a single air pipe and
harness wiring and multiplug. The air pipe from the unit passes through a grommet in the wheel well. It is important
to ensure that this grommet is not disturbed and correctly installed. Incorrect fitment will allow water to enter the wheel
well leading to possible damage to and failure of the air supply unit.
The unit comprises a piston compressor, a 12V electric motor, a solenoid operated exhaust pilot valve, a pressure
relief valve and an air dryer unit.
The electric motor, compressor, air dryer and pressure limiting and exhaust valve are mounted on a frame which in
turn is mounted on flexible rubber mountings to reduce operating noise.
Removal of the air supply unit does not require depressurisation of the air suspension system. The corner and the
reservoir valves close, retaining the air in the system.
