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OPERATING INSTRUCTIONS
Air Ride Operation
1. Trailer air pressure must be maintained above 90 PSI
before operating. PROTECTION VALVES are used
to maintain 65 PSI air brake pressure during
suspension or remote system air loss.
2. The semitrailer is equipped with a single ride height
control valve located on center axle.
If suspension air loss should occur, completely
deflate suspension and temporarily operate on
the air springs internal rubber bumpers. Carefully
proceed to the nearest semitrailer service facility.
To deflate the air suspension, disconnect the
lower connection on the linkage of the automatic
air valves. Rotate the valve control arms down
o
about 45
to exhaust the air. To restore to normal
operation, simply reverse the procedure.
Suspension Lower Operation
The Suspension Lower switch allows straight down
lowering of trailer deck by exhausting air from suspension
air springs (See Figure 3-3.)
This also relieves air from suspension air springs during
trailer outrigger lift operations.
1. To lower trailer, place switch in "ON' position.
NOTE
When trailer is in motion, switch must be in "OFF"
position for normal height control valve automatic
operation.
3-24
CAUTION
Third Axle Lift Operation
The manual ON/OFF valve, when activated, sends a
pneumatic signal to the pilot valves. These valves
exhaust the air suspension air springs and inflate the air
lift air springs causing the axle to lift.
Suspension Operation (Axle Down)
1. With the manual ON/OFF valve in the OFF position,
the air suspension system is in operating position.
Axle Lift Operation (Axle Up)
2. With the manual ON/OFF valve in the ON position,
the axle lift is in operating position and raises the
axle.
Do not overload axle.
The lift axle may be operated in the raised
position as follows:
1. When vehicle is unloaded or partially loaded
as long as adjacent axles are not overloaded.
2. When vehicle is loaded and off highway, but
at a reduced and safe speed.
3. When vehicle is loaded and on highway, but
as a government law allows for turning
purposes and then at reduced and safe
speed.
4. Whenever it is necessary for reasons of
safety to maintain traction or sufficient load
on other vehicle driving, steering, braking, or
cornering axles.
Failure to adhere to these directions could result
in overload fines, premature equipment failure
and/or vehicle accident.
CAUTION
F-618-0911 Edition
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