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OPERATING INSTRUCTIONS
Coupling of the Tractor to the
Semitrailer
Keep all personnel clear of front, rear, and sides
of towing vehicle and semitrailer during coupling,
component operations, and uncoupling. Failure
to stay clear can result in serious personal injury
or death.
1. Verify the semitrailer wheels are chocked and brakes
function properly.
2. Make certain the coupler of the towing vehicle's fifth
wheel is open by pulling the latch handle.
3. Slowly back the towing vehicle so its fifth wheel
contacts the front of the king pin plate on the
semitrailer and slips under it. Continue backing until
the fifth wheel coupler locks onto the semitrailer
kingpin.
4. Verify the vehicle coupling is secure by attempting to
pull the tractor forward a few inches. If the tractor
disconnects from the semitrailer, locate source of
coupling failure; repair before continuing; and repeat
steps 3 and 4.
5. Check that the towing vehicle couples securely to the
semitrailer before setting towing vehicle and
semitrailer parking brakes.
IMPORTANT
Keep brakes engaged for remainder of hookup,
checkout procedures, and parking.
3-4
DANGER
Connecting Tractor Services to
the Semitrailer
1. Connect the towing vehicle 12 volt 7-pin or 24 volt
12-pin electrical plug to the electrical receptacle on
the front of the semitrailer (See Figure 3-2.)
IMPORTANT
The key on the plug and the keyway in the socket
must be properly aligned before inserting the plug
into the semitrailer socket.
Hydraulic operating pressures greater than 2500
psi can cause damage to the trailer.
2. Air Lines (See "Pre-Coupling of Semitrailer and
Tractor" on page 3-3.)
CAUTION
F-618-0911 Edition
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