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3. Remove the auxiliary air line from the air chamber and replace it on the storage fitting. When the
auxiliary air line is removed, the frame index pins should engage. Sometimes it is necessary to roll the
truck back and forth, slightly, to align the pins.
NOTE: Always make sure the index pins are locked before loading the trailer and/or moving the trailer to
another location.
4. Follow the expanding procedures above when returning the trailer to the closed length.
Unloading procedures
1. Get trailer in position to unload.
2. Unlock slider bogey lock located on the driver side front of the axles for positioning the bogey to the
desired location on the main frame of the trailer by depressing the air assist device. The slide bogey lock
mechanism is a double action lever. When the air assist is activated it will apply pressure to the
mechanical lever that retracts the lock pins. The lock pins may not retract until they are unbound by the
operator using the tractor to roll the trailer back and forth, relieving the pressure against the locking pins
thereby allowing them to retract.
NOTE: Allow the air assist and the tractor to do the work. If you manually pull the lever out too far you
could rack the lever mechanism.
3. Raise rear bumper by opening the vented ball valve next to the roller unlock valve. This will raise the
rear safety bumper.
4. Unstrap and store the rear strap at the back of the trailer (this is done because this strap is difficult to
unstrap when the trailer is in the ground-level position).
5. Get in truck and get shifter in reverse.
6. Start backing up with a fair amount of speed. (This is very important because you cannot start the
process from a dead stop, you must be rolling in reverse to start the procedure.)
Pull the tractor hand
valve down, this will lock the trailer axles in place, and you will be sliding the main frame of the trailer
over and through the slider bogey.
NOTE: When sliding the trailer into the ground level position, be sure to make this step a smooth, quick
motion.
7. Apply the parking brake to the truck and trailer.
8. Lock the slider bogey to the main frame at the desired position. (The desired position can be anywhere
along the slider range of motion).
9. Lift the front of the trailer by sliding the hydraulic cable into position #1 and raise the front end to the
desired height.
NOTE: The operator should try to achieve an unloading angle that does not bend the truss package until it
has touched the ground and is partially off the trailer.
10. At this point unstrap the load, store straps, and open the roller locking valve located roadside to the rear
of the landing gear, the rollers will not unlock yet, because there is no air to the trailer. (Parking brake
must be activated).
Split unloading
The back half of the rollers can be unlocked without unlocking the front half of the rollers for split loads. The
unlocking device includes a pin that connects the front and rear lock pin bars. This pin is located on the road
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