Section 16: SUSPENSION
PA1562
35
FIGURE 47: FRONT HEIGHT CONTROL VALVE 16100
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 46 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. 47).
NOTE
Allow suspension to stabilize before taking
reading.
When the desired height is obtained, tighten
clamp.
Rear 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 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 46 for more details).
2. Loosen the clamp on the height control
valve rubber coupling and bring it up or
down (Fig. 48).
NOTE
Allow suspension to stabilize before taking
reading.
FIGURE 48: REAR HEIGHT CONTROL VALVE 16093
When the desired height is obtained, tighten
clamp.
6. 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
independently according to the following
conditions:
Loading Position
As the load increases and lowers the vehicle
body, the overtravel lever commands the height
control valve to add air to air springs.
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