3-8
F-823-0216 Edition
OPERATING INSTRUCTIONS
Axle/Tail Control Lever
The Axle/Tail Control Lever is located
on the control
panel
The lever is used both for
loading/unloading and dock leveler operation.
See step 2
of “Dock Leveler Control Operation (Option)” on
page 3-17
for use of Axle/Tail Control Lever for dock
leveler operation. The Axle/Tail Control Lever is beside
the winch control lever and has three positions
Table 3-1: Axle/Tail Control Lever
Air Suspension Dump Valve
1. The 900D Series semitrailer comes equipped with a
“dump valve” on the air ride suspension as standard
equipment
The valve has two
primary purposes.
2. When the trailer is in the load position (tail down), you
can dump the air (turn knob to
ON
) to achieve the
lowest load angle.
a. It is NOT necessary to dump the valve each and
every time that you ground load; however, when
you need to minimize the load angle to load on
the tail or over the hinge, then you can dump the
air. The only time to operate the dump valve
during the ground loading process is while the
axles are in the foremost forward position.
IMPORTANT
Do not operate the axles while the air is dumped
(knob turned on.)
b. To load, bring your axles forward until your travel
cylinder stops, dumped the air (turn knob to
ON
.)
c. Before returning the trailer axles to transport
position, return the dump valve knob to the
OFF
position. This will inflate the air suspension and
give proper clearance for the tires and traveling
undercarriage.
3. While loading from a dock (tail at dock height), the
dump valve will exhaust all air from the suspension.
This places the suspension and trailer in the most
stable position for loading heavy equipment from a
dock onto the trailer deck.
a. It is common to use the dump valve each and
every time while loading/unloading from a dock.
It adds stability and safety to the operation.
b. To load from a dock, bring the undercarriage
forward to engage the dock arm. Return the
undercarriage rearward and raise the tail a few
inches above dock height.
c. Dump the air (turn knob to
ON
position). The air
will exhaust from the suspension and lower the
tail to dock height. If you need to adjust the axles
to better match the dock height, it is ok to move
the axles forward or rearward those few inches to
accomplish the required height.
AXLE/TAILCONTROL LEVER
PUSH IN
In this position, the undercarriage
slides forward lowering the tail for
loading.
CENTER
This is the neutral position.
PULL OUT
In this position, the undercarriage
slides to the rear raising the tail The
undercarriage must be in the rear-most
position for transport.
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