PREVOST LE MIRAGE XLII BUS SHELLS, Руководство по обслуживанию

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Section 16: SUSPENSION
PA1564
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At this point, it should not be necessary to make
an adjustment under normal service conditions.
However, if an adjustment is required, change
the position of the overtravel lever in relation to
the overtravel control body. The lever should be
moved up to raise vehicle height, and down to
lower it. Check that main air pressure is at
normal operating pressure and raise the vehicle
to the specified height.
CAUTION
Always adjust on "fill cycle". If it is necessary
to lower vehicle height, release sufficient air to
be well below height, and adjust to height or
fill cycle.
FIGURE 40: FRONT HEIGHT CONTROL VALVE
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The normal ride height is obtained by adjusting
air spring clearance of both front and rear
suspension as follows:
Front air spring clearance
1. With the vehicle at normal operating air
pressure (100 - 125 psi (689 - 860 kPa)),
measure air spring clearance. This
clearance should be 11 ± ¼” (279 ± 6 mm).
NOTE
The measurement should be taken from
underneath the upper air spring support on
subframe to top of the lower air spring support
on axle (refer to figure 39 for more details). If
adjustment is required, begin with the drive
axle.
2. Loosen the clamp on the height control
valve rubber coupling and bring it up or
down (Fig. 40).
NOTE
Allow suspension to stabilize before taking
reading.
When the desired height is obtained, tighten
clamp.
Rear air springs clearance
1. With the vehicle at normal operating air
pressure [100 - 125 psi (689 - 860 kPa)],
measure air spring clearance. This
clearance should be 11 ½ ± ¼" (292 ± 6
mm).
NOTE
The measurement should be taken from
underneath the upper air spring support on
subframe to top of the lower air spring support
on axle (refer to figure 39 for more details).
2. Loosen the clamp on the height control
valve rubber coupling and bring it up or
down (Fig. 41).
NOTE
Allow suspension to stabilize before taking
reading.
FIGURE 41: REAR HEIGHT CONTROL VALVE
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When the desired height is obtained, tighten
clamp.
10. HEIGHT CONTROL VALVE
The height control valves automatically add air
to, or release air from air springs to maintain
constant suspension height regardless of load,
or load distribution. Each valve adjusts inde-
pendently according to the following conditions: