Section 16: SUSPENSION
PA1562
5
1. DESCRIPTION
The vehicle is provided with an air suspension system. The system consists of air springs, height control
valves, radius rods, sway bars, tripod and shock absorbers (Fig. 1, 2, 11, 36, 37 and 38). The system
operation is fully automatic and maintains a constant vehicle height regardless of load, or load
distribution.
The vehicle can also be equipped with systems such as:
• Front Kneeling (w/ Front High-Buoy);
• Front Kneeling (w/ Full High-Buoy);
• Front Kneeling (w/ Front High-Buoy) and Low-Buoy Combination;
• Front Kneeling (w/ Full High-Buoy) and Low-Buoy Combination;
2. I-BEAM AXLE FRONT SUSPENSION
FIGURE 1: FRONT SUSPENSION COMPONENTS
16096
FIGURE 2: DETAILS OF FRONT SUSPENSION 16110
2.1 AIR SPRINGS
The air springs are made from a special
compound rubber molded to the proper contour
and dimensions. The entire vertical load of the
vehicle is supported by these springs. The I-
beam front axle is provided with air springs that
are attached to the subframe and to the axle
(Fig. 3).
FIGURE 3: AIR SPRING 16052
2.1.1 Inspection
1. Check operation of bellows.
2. Visually inspect bellows for evidence of
cracks, punctures, deterioration, or chafing.
Replace the bellows if any damage is
evident.
3. With the primary air system at normal
operating pressure (95 - 125 psi (655 - 860
kPa)), coat all suspension air line
connections and bellows mounting areas
with a water and soap solution. Bubbles will
indicate an air leak, and none is
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