MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company

Operating Instructions
TYPICAL HEIGHT CONTROL VALVE
ALIGNMENT PIN
OR DOWEL
SUPPLY FROM
FORWARD AIR
TANK
EXHAUST
AIR BAG
TOP VIEW
CONTROL
ARM
REAR VIEW
FORWARD
DELIVERY TO
RH AIR BAG(S)
DELIVERY TO LH
AIR BAG(S)
LINK
BOLT
FROM DUMP
VALVE
SWITCH
MOUNTING
NUTS
LINK ROD
02941
More 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.
3. Lower and hold the valve control arm(s) 45 degrees until
the air has been exhausted from the air springs (about
30 seconds).
WARNING! keep away from the air springs as
they are being inflated.
NOTE: On dual-valve systems, begin with the LH
valve on next step.
4. Raise and hold the control arm on the valve (allow for
some delay time) and inflate the air springs until air pressure
provides the average air spring height. (Note: For a
dual-valve system, this will be the average height of all of
the rear air springs on a side.)
Model 330 PB1318 3/01 – 103 –