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5.2.12 SUSPENSION SYSTEM
(cont'd)
5.2.12.1 AIR RIDE SUSPENSION (cont'd)
4.
Air Control (Ride Height Control):
An air ride suspension system uses the air
from the tractor to pressurize the air springs.
A single height control valve is used to monitor
the height of the frame above the axle and
add/exhaust air from the system as required
to maintain this dimension. Normally this
dimension is set for your trailer and seldom
changes.
The height control valve is located on one of
the axles and controls the adding/exhausting
of air to the air springs. As the dimension
between the frame and axle increases,
the control lever moves down and air is
exhausted from the system. As the dimension
decreases, air is added to raise the frame. All
valves incorporate a 5 to 15 second time delay
to minimize jerking or cycling. Replace valve if
not functioning properly.
Check ride height after first use and
periodically thereafter to maintain proper
ride height. Improper ride height can cause
severe component damage and void your
warranty. Maintaining correct ride height is the
responsibility of the operator.
There are two different ride heights (15" and
17"). All trailers with the exception of B-Train
Lead are 17" ride height. The B-Train Lead
is 15". This measurement is taken from the
center of the axle to the underside of the
frame.
NOTE
Measure the axle that has the ride
height control mounted to it. The
other axle(s) may have more or less
distance between the frame and axle
depending on the height of fifth wheel.
If ride height is incorrect contact your
dealer.
Valve Schematic
System Schematic
Valve
Fig. 64 RIDE HEIGHT CONTROL
