Medium Duty Operator's Manual - Peterbilt Motors Company

STARTING AND OPERATING THE VEHICLE
DRIVING TIPS AND TECHNIQUES
WARNING! To prevent possible injury and damage to
property, ensure that a vehicle is parked and the
wheels chocked before beginning this procedure.
CAUTION: Completing this procedure will
enable you to safely reach the nearest authorized
Peterbilt repair facility to have ride
height and pinion angle reset using the proper
equipment and technique. Do this as soon as
possible to avoid potential driveline damage.
NOTE: Suitable wheel chocks are at a minimum
an 18-inch (46 cm) long 4x4.
Ride Height Measurement (Location for Tandem Axles Shown)
Proprietary Rear Ride Height [inches (mm)]*
Air Suspension Single Drive Tandem Drive
Air Trac 11.00 (279) 11.00 (279)
Low Air Leaf 6.50 (165) 8.50 (216)
*These values are for a fully laden vehicle
Follow this procedure to temporarily set ride height.
1. Ensure that the air supply and delivery plumbing of
the height control valve is consistent with the illustration.
NOTE: At least one of the mounting holes in the
height control valve bracket will be slotted to permit
rotating the valve.
NOTE: On dual-valve systems, begin with the LH
valve on the next step.
2. Loosen the fasteners mounting a height control valve to
its bracket.
Medium Duty (R05/09) Y53-6008A – 131 –