Medium Duty Operator's Manual - Peterbilt Motors Company

DRIVING TIPS AND TECHNIQUES
WARNING! Be extremely careful when deflating
the air springs. The rear of the vehicle will
drop about 3-1/2 inches (88 mm) when the air
springs are deflated. Make sure that no persons
or objects that could be injured or damaged
are under the vehicle.
To minimize the risk of damage or injury, do
not use the dump valve to deflate the air
springs. Operate the height control valve(s)
manually to ensure positive control of air
spring deflation.
To minimize risk of injury, keep away from air
springs as they are being inflated.
STARTING AND OPERATING THE VEHICLE
ALIGNMENT PIN OR DOWEL CONTROL ARM LINK BOLT
FROM DUMP VALVE SWITCH
FORWARD
02941A
Typical Height Control Valve (Top View)
– 132 – Y53-6008A Medium Duty (R05/09)