Volvo ECS - Page 149

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Solenoid valve
blocks - 6x2 or
8x2 - axle lower
Note: Illustration
spread across 2
pages
If the driver presses the bogie switch to ʻlower axleʼ position, the
ECU removes the voltage from the control solenoid in (Y29).
Air escapes to atmosphere via port (3) of (Y29).
Note that the ʻlift axleʼ solenoid in (Y29) remains energised.
+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