PREVOST H3-41 Maintenance Manual page 598

PROCEDURE
DANGER
Park vehicle safely, apply parking brake, stop engine. Prior to working on the vehicle, set the ignition
switch to the OFF position and trip the main circuit breakers equipped with a trip button. On Commuter
type vehicles, set the battery master switch (master cut-out) to the OFF position.
REAR SUSPENSION AIR SPRINGS ADJUSTMENT
Measurement
1. Make sure that the air
system pressure is at least
90 psi.
2. Measure the drive axle air
springs clearance (all four
air springs). To do so,
measure the clearance
between the round metal
plate found above the air
spring and the other round
metal plate found under
the air spring.
3. The clearance should be
in accordance with the
value of Table 1.
Air spring height adjustment
While proceeding with one side of the
vehicle at a time, adjust the air springs
clearance with the height control valve
4. It is necessary to adjust clearance on "fill
cycle".
a) Disconnect the link. This link
equipped with a rubber bushing that
allows easy disconnection.
b) Lower the control arm to release some
air from air springs.
c) Raise the control arm to fill the air
springs (the valve is now in "fill cycle")
and connect the link back in place.
is
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