User Manual

Suspension Air Pressure Gauge &
Switch
Your vehicle may have an air suspension
and a deflation switch which allows the air
in the suspension to be exhausted from a
switch on the dash. The normal purpose of
this feature is to allow you to lower the
vehicle for loading. A guard on the switch
prevents you from accidentally deflating
the suspension.
The Suspension Air Pressure gauge
(optional) indicates the amount of air
pressure in the air suspension springs in
pounds per square inch (psi). Air pressure
in the spring is related to the rear axle load.
The greater the rear axle load, the greater
the air pressure in the air bags. Therefore,
the air pressure displayed will vary
,
depending upon the rear axle load.
What to do if an Air Spring
Ruptures
If an air spring has ruptured, drive the
vehicle to a safe stop of
f the highway to
investigate the problem.
WARNING
DO NOT continue to drive with rup-
tured
air springs. The air loss can
cause the spring brakes to apply al-
lowing your brakes to drag and burn
up the linings, which could lead to an
accident causing death or personal in-
jury. DO NOT continue to operate the
vehicle in this condition.
WARNING
DO NOT drive the vehicle if the air
pressure
is less than 100 psi (690
kPa). Driving the vehicle with less than
100 psi (690 kPa) could make the
brakes unsafe to use which could
cause an accident involving death or
personal injury.
CAUTION
Operating a vehicle with air suspen-
sion
bags either overinflated or under-
inflated may cause damage to drive-
line components. If a vehicle must be
operated under such conditions, do
not exceed 5 mph (8 km/h). Failure to
comply may result in equipment dam-
age.
You can get to a repair facility by removing
the height control link connected to the
axle and to the suspension air valve control
arm. This will cause the air valve control
arm to center in the closed position.
Removing the link will allow the air system
of the truck to operate normally so that the
vehicle can be driven to a service center
.
Fifth Wheel
The following applies to tractor
configurations:
DRIVING - Fifth Wheel
156 Y53-6113-1A1 (11/20)
4