2-12. COUPLING SEMITRAILER TO TRACTOR (Con't).
e. Remove dummy couplings (13)
(5 and 7) at front of semitrailer. Hang removed
SERVICE air couplings are blue,
EMERGENCY air couplings are red.
f. Connect tractor SERVICE air cou-
pling (6) to semitrailer SERVICE air coupling
(5). Connect tractor EMERGENCY air coupling
(8) to semitrailer EMERGENCY air coupling (7).
DO NOT plug both intervehicular elec-
trical cables into semitrailer. Failure
to follow this warning may result in
damage to electrical system or form
sparks causing a fire or an explosion.
g. Plug tractor intervehicular electrical cable (10) into electrical connector on cover of
semitrailer voltage control unit (12). If tractor uses a 12-volt system, plug into 7-contact electric
connector (11). If tractor uses a 24-volt system, plug into 12-contact electrical connector (9).
h. Free handcrank (15) from stowage
clip. Rotate handcrank counterclockwise to
raise landing gear legs (16) to FULL height.
Stow handcrank to stowage clip.
i. If used, stow ground boards (14) in
j. Remove chock blocks and return