Air Suspension (If Equipped) - GMC C series 2002 Owner's Manual

Also, always start the vehicle in motion with the
-
two speed axle in the LOW position. When you upshift
the rear axle from LOW to HI, move the lever to the HI
position, disengage the clutch, pause, engage the clutch
and then press down on the accelerator. When you shift
the axle down from HI to LOW, you don't have to
clutch. Just move the lever to LOW, release the
accelerator and then quickly press it down again.

Air Suspension (If Equipped)

Your vehicle may be equipped with the Hendrickson
-
HAS Series single axle air suspension which is designed
- -
for single axle on highway use. This feature is available
in 19,000 lb. and 23,000 lb. capacities and as a low
profile option for operations which require extra cubic
capacity and a reduced deck height.
With this air suspension system, the ride height is
set during vehicle assembly so that the vehicle has a
constant frame height. The system will then increase
or decrease air pressure in the air springs to maintain
this height.
2-22
Air Suspension Dump Control (If Equipped)
If your vehicle is equipped with the Hendrickson
-
HAS Series single axle air suspension, you may have
this control. The air suspension dump control allows
the operator to lower the deck height approximately
4.5 inches (11.5 cm) from the normal frame height.
The light in the switch will be illuminated whenever the
switch is in the "dumped" position.
The switch to deflate and
inflate the air suspension is
located on the upper left
side of the instrument panel
above the driver's side vent.