M983 Tractor Operating Procedures (Cont)
Remove and store rear mud flaps and brackets to allow
trailer clearance while towing a M860A1 trailer.
Pull fifth wheel secondary lock release handle (1) completely out and
hook in out position.
Pull out fifth wheel primary lock release handle (2).
Push down fifth wheel tail ramps (3) so ramps are level with, or below
top surface of, guide ramps (4).
Prepare semitrailer for coupling (TM 9-2330-357-14&P,
TM 9-2330-364-14&P, or TM 9-2330-366-14&P).
Start engine (para 2-11a or 2-11b).
Aline vehicle with semitrailer,
(6.1) Chock semitrailer wheels.
Be careful that no one is standing directly behind
vehicle or semitrailer during coupling procedure to
prevent personal injury.
Do not run kingpin up guide ramps to prevent damage
to kingpin, guide ramps, or fifth wheel.
Soldier A stands beside semitrailer and gives hand signals while
Soldier B slowly backs vehicle under semitrailer to aline kingpin with
throat of fifth wheel.
Check that front of semitrailer is on guide ramps (4).
Stop vehicle and connect gladhands to trailer gladhands.
Pull trailer on supply knob to provide air pressure to trailer.
Apply trailer brakes.
Adjust semitrailer height, as needed, using landing gear.
Continue backing slowly until fifth wheel jaws lock around kingpin.