TM 9-2330-373-14 & P
Section IX. SUSPENSION SYSTEM MAINTENANCE
4-34. AIR SUSPENSION SYSTEM
THIS TASK COVERS
a.
General
b.
Adjustment
c.
Removal of rubber bushing
Troubleshooting References
and torsion bar
Item No.
d.
Installation of rubber bushing
18 All air springs are
and torsion bar
flat
e.
Replacement of torsion bar
19 Air springs flat on
f.
Removal of air spring
one side only
g.
Installation of air spring
20 Semitrailer leans
h.
Removal of axle connection
21 Suspension deflates
components
rapidly when parked
i.
Installation of axle connection
22 Air springs blown out
components
23 Torsion bar breakage
J.
Removal of height control valve
24 Wear of torsion bar
k.
Installation of height control valve
rubber bushing
l.
Removal of adjusting rod
m.
Installation of adjusting rod
n.
Removal of shock absorber
o.
Installation of shock absorber
Test Equipment Required: None
Personnel Required: 1
GENERAL
1.
Safe brake air pressure of 65 psi is automatically maintained by brake valve in the event of air loss due to a failure
in the system.
2.
Rubber bumpers inside the air springs carry the loaded semitrailer should all springs go flat.
3.
Stability through the axle connections allows operation of a loaded semitrailer with pressurized springs on one side
of semitrailer only.
4.
If an air spring fails, disconnect the height control valve linkage on inoperable side. Air to springs on that side will
be shut off, allowing air pressure to build up in system and in air springs on opposite side.
ADJUSTMENT
1.
Adjust height control valve for proper dimensions between axle center line and underside of frame by setting one
valve at a time.
2.
Position semitrailer on level ground, coupled to towing vehicle.
Build up air pressure to 65 psi and maintain this
pressure while adjusting height control valve.
4-90