PREVOST H3-41 Maintenance Manual page 596

MI16-14 / Page 2 / 10
The two rear suspension height control valves are mounted to the chassis and connected to the fore
air springs of the rear underframe through a control arm and link.
One front suspension valve is mounted to the chassis and connected to the front axle through a control
arm and link.
On IFS, one height control valve is located on the center of the front sway bar.
If an adjustment is required, change the position of the control arm. The control arm should be moved up
to supply air and raise vehicle height and should be moved down to release some air from air springs and
lower vehicle height. Make sure that air pressure is greater than 90 psi.
The appropriate vehicle body height is checked by measuring the clearance of all the air springs installed
on the front and rear suspension. The tag axle, by its nature, doesn't need to be adjusted.
If an adjustment is required, begin with the rear suspension.
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