operators_manual

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
.
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.
Trailer Operation
How to Lock the Kingpin
Ensure that the fifth wheel lock is in the
unlocked position.
WARNING
Always inspect the fifth wheel for prop-
er
locking after coupling the tractor to
a trailer. Failure to properly couple the
tractor to a trailer (the kingpin is en-
gaged in a closed lock jaw with the
lock jaw secured by a closed plunger)
may cause trailer separation which
could result in an accident involving
death or personal injury.
To lock the fifth wheel around the kingpin:
DRIVING - Trailer Operation
130 Y53-6096-1C1 (09/20)
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