TRUCK SERVICE MANUAL
BODIES AND CABS
AIR VALVE ASSEMBLY
1. Use a pair of pliers to free hose at valve fitting.
2. Loosen lock nut holding valve in support bracket.
Use a screw driver to pry valve free of bracket.
AIR HOSE ASSEMBLIES
1. Disconnect air supply.
2. Disengage seat cushion from assembly by removing
nuts, lock washers and washers. Move seat cushion
forward to free nylon rollers from housing under seat
3. Hose from control valve to reservoir can be removed
by using pliers and pulling away from hose fittings.
The hose from reservoir to air spring can be
removed using a pliers, release hose clamps and
slide off ends of hose in direction of arrows (Fig. 7).
Hose can then be removed from fittings.
Fig. 7. Air Suspension System
AIR SPRING ASSEMBLY
1. Wedge seat in upper position by using wood shim
1. Release air spring assembly from seat base
under tube located under front of seat cushion or by
assembly by removing machine screw and lock
shim under tube below back of cushion.
washer (Fig. 8). To perform this operation, removal
of entire seat assembly may be required.
2. Release air pressure from air spring bag by pulling
out air control valve button
2. Grasp air spring bag at top and unscrew (counter
clockwise) from elbow.
3. Remove seat cushion by removing nuts, lock
washers and washers. Move seat forward to free
nylon rollers from housing under seat cushion.
4. Secure seat side panel assemblies with wire, across
front of seat to retain their position.
5. Remove left snap ring from end of hinge shaft at
front of shock absorber (Fig. 9).
6. Remove hinge shaft by tapping shaft from left to right
side. This will free the two washers on end of shaft.
Washers are not illustrated in Fig. 9.
7. Use a small diameter punch to remove one of the roll
pins from hinge shaft at rear of shock absorber, (Fig.
8. Remove rear hinge shaft at rear of shock absorber
Fig. 8. Air Spring Assembly
freeing the shock.