Volvo VNL 780 Operator's Manual page 360

350 OPERATION
Fifth Wheel Slider (Optional)
Open — This is the position the fifth wheel is in after the trailer is uncoupled. The jaw is
open and the operating rod is now dropped down and can be freely moved around. The
safety latch is rotated toward the rear of the fifth wheel. This is the position the fifth wheel
must be in when being coupled to a trailer.
Fifth Wheel Slider (Optional)
The fifth wheel comes standard with an air operational slider. To remain within legal weight
limits, this feature allows the driver to distribute the load easily on the axles.
The air operated slider takes the work out of adjusting the tractor for various trailer loads.
The fifth wheel portion is easily adjusted, even with a fully loaded trailer connected.
Movement between the adjustable saddle plate and the stationary base plate rail can result
in wear, causing longitudinal, latitudinal and vertical slack. Field repairs can be made to
reduce this slack for additional service life.
W9000205