Volvo ECS - Page 143

143
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Solenoid valve
blocks - 6x2 or
8x2 - suspension
raise
Note: Illustration
spread across 2
pages
If the driver presses the bogie switch to ʻraiseʼ position,
and/or the ECU receives a ʻraiseʼ signal from a height
sensor, the ECU sends +24 V to energise the control
solenoid and drive axle solenoids in Y25.
The control solenoid and drive axle solenoid in Y29 are
also energised. Air is supplied to both the drive axle and
trailing/pusher axle air bellows.
+24+24
PORT NUMBERS
1. Air supply from wet tank
3. Exhaust
21. To LH/RH
trailing/pusher
bellows
22. To lift axle bellows
23. Plugged
Y29