Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors

DRIVING TIPS AND TECHNIQUES
AIR BAG
SUPPLY FROM FORWARD
AIR TANK
EXHAUST
DELIVERY TO RH AIR BAG(S)
Typical Height Control Valve
(Rear View Looking Forward)
MOUNTING NUTS
DELIVERY TO LH AIR BAG(S)
LINK ROD
02941B
STARTING AND OPERATING THE VEHICLE
3. Rotate the valve either clockwise or counterclockwise
until air pressure in the air springs provides the ride
height specified for that suspension. Measure the ride
height from the bottom of the frame rail to the approximate
centerline of the rearmost drive axle hub:
• For tandem axles, make the vertical measurement
at the centerline of the suspension (see illustration
on page 134).
• For a single axle, make the measurement in front of
the axle, in the area forward of the tires but not past
the suspension bracket.
4. When at the correct ride height, ensure that the height
control valve lever is in the neutral position, then
install either the built-in alignment pin or a 1/8-inch (3
mm) dowel (see page 134).
5. Torque the mounting fasteners to 55 — 75 lb. in.
(6.2 — 8.5 N.m.).
6. Remove the alignment pin or dowel.
7. Repeat Steps 2 through 6 above for the RH valve on
vehicles with a dual-valve system.
– 136 – Y53-6027 Medium Duty (R05/09)