2-14. UNCOUPLING SEMITRAILER FROM TRACTOR (Con't).
c. If in muddy, sandy, or snow covered
area, remove ground boards (1) from stowage
brackets and place on ground directly under
landing gear sand shoes (4).
d. To lower landing gear, disengage
handcrank (2) from clip on curbside landing
gear leg (3), pull out to obtain high speed posi-
tion, and turn clockwise. After sand shoes (4)
contact ground or ground boards (1), push in
on handcrank to obtain slow speed position,
and turn a few more turns. Stow handcrank in
e. Unplug tractor intervehicular electrical cable (14) from electrical connector on cover of
semitrailer voltage control unit (13).
Semitrailer parking/emergency brakes will automatically set when EMER-
GENCY air coupling (7) is disconnected.
f. Disconnect tractor SERVICE and EMERGENCY air couplings (5 and 7) from semitrailer
SERVICE and EMERGENCY air couplings (6 and 8). Remove dummy couplings (12) from storage
brackets (9) and install on semitrailer air couplings (6 and 8).
g. Pull outward on tractor's primary release handle (11), then pull outward on secondary
release handle (10) until hook releases kingpin.
h. Slowly drive tractor away from semitrailer.