Drive Axle (Not 4X2 Tractor); Drive Axle (4X2 Tractor) - Volvo ECS Training Tips And Tactics

ECS Gen. 1
1. Air supply from wet tank
Solenoid valve
3. Air drain via silencer
block - drive axle
21. Air to and from LH drive axle air bellows, and trailing (or
(not 4x2 tractor)
pusher) LH air bellows
21. Air to and from RH drive axle air bellows, and trailing
(or pusher) LH air bellows
23. Air to and from front axle solenoid valve (plugged if rear
air suspension only)
The solenoid block for all variants (except 4x2 tractor)
contains 3 solenoid valves:
- SID 3 the RH valve - air to and from RH air bellows for
drive axle and trailing or pusher axle.
- SID 4 the LH valve - air to and from LH air bellows for
drive axle and trailing or pusher axle.
- SID 7 the ʻcentralʼ valve - operating as a control valve.
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