TM 9-2320-272-10
2-26.
OPERATION OF TRACTOR AND FIFTH WHEEL (Contd)
d.
Uncoupling Semitrailer.
WARNING
Use ground guide when backing up to
park semitrailer. Failure to do this will
result in damage to vehicle, injury, or
death.
(1)
Place semitrailer in proper location,
engage airbrake hand control level (2) and parking brake
lever (1).
(2)
Place wheel chocks (11) in front and
behind semitrailer wheels.
(3)
Place landing gear float pads (5) on
ground under semitrailer landing gear (4).
(4)
Turn crank (3) until landing gear (4)
makes firm contact with float pads (5’
(5)
Disconnect
and
remove
electrical
cable (7) from semitrailer and secure cable (7) on tractor.
(6)
Turn handle (15) of airbrake hose
shutoff valve (14) to closed position.
NOTE
Trailer air supply valve inside vehicle cab will automatically pop back and disengage when air couplings
are disconnected.
(7)
Disconnect air couplings (6) from semitrailer and secure airhose and couplings (6) on tractor.
(8)
To release semitrailer kingpin (10), pull plunger handle (13) forward, then out, to open fifth wheel
coupling jaws (12).
(9)
Move tractor forward until fifth wheel (8) and approach plate ramps (9) are clear of semitrailer.
2-156
