Volvo VNL 780 Operator's Manual page 358

348 OPERATION
If the fifth wheel is equipped with a sliding mounting, follow the advisory labels attached to
the component. Also, read the literature provided by the manufacturer.
DANGER
Always keep the fifth wheel plate well
lubricated to prevent binding between the
tractor and trailer. A binding fifth wheel
could cause erratic steering and loss of
vehicle control that may result in serious
personal injury or death.
There are three operating positions for the fifth wheel locking mechanism (ASF fifth wheel
is shown as a typical fifth wheel):
Locked — This is the position that the fifth wheel will be in with a trailer hooked up. In
the locked position, the operating rod is retracted and the safety latch will freely swing
back and forth.
Lockset — This is the position the fifth wheel is in when uncoupling the trailer. To achieve
the lockset position, the operating rod is pulled out with a slight upward motion. The
operating rod shoulder will catch on the plate casting. The safety latch is rotated toward
the rear of the fifth wheel.
W9000180