Land Rover Workshop Service and Repair Manuals

Removal of the air supply unit does not require the whole air suspension system to be depressurised. The front and rear 
valve blocks and the reservoir valve block are normally closed when de -energised, preventing air pressure in the air 
springs and the reservoir escaping when the unit is disconnected.  
 
There are a number of conditions that will inhibit operation of the air supply unit. It is vitally important that these system 
inhibits are not confused with a system malfunction. A full list of air supply unit inhibits are given in the air suspension 
control module section in this chapter.  
 

Air Supply Unit - Sectional View  

Item Part Number

Description

1

 -

Exhaust valve cap

2

 -

Plunger

3

 -

Valve seat

4

 -

Intake silencer port

5

 -

Delivery valve

6

 -

Valve guide

7

 -

Cylinder head

8

 -

Dryer case

9

 -

Desiccant

10

 -

Pilot exhaust line

11

 -

Isolation rubber mount

12

 -

Motor assembly

13

 -

Crankcase

14

 -

Crank

15

 -

Crankcase cover

16

 -

Connecting rod

17

 -

Piston

18

 -

Pilot exhaust valve

19

 -

Spring - pressure relief