d. Completing Coupling Semitrailer to Towing Vehicle.
(1) Before kingpin plate (1, fig. 2-16) starts to ride approach ramps (2), check
that the kingpin plate (1) is above approach ramps (2). Adjust height as
needed by using landing gear. Make sure towing vehicle fifth wheel coupler
jaws (3) are open.
(2) Slowly back the towing vehicle until coupler jaws (3) engage the kingpin
Visually check the coupling. You should not be able to
see light between the fifth wheel and the kingpin plate.
When towing the semitrailer with the M818 (prime mover)
the fifth wheel wedges on the M818 are to be in the
locked-in (pushed in) mode for highway and secondary
road use, and in the locked-out (pulled out) mode for
cross country operation.
Completing Coupling Semitrailer to Towing Vehicle
If coupling operation is not completed and another
attempt is to be made, pull towing vehicle forward
carefully. Do not exceed the limits of air hoses and
(3) Make sure coupling is secure by inching towing vehicle forward. If
coupling is not locked, rock towing vehicle back and forth slowly until
kingpin (1) is locked in fifth wheel (5).