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Uncoupling

The basic steps for uncoupling a trucktractor
from a semi-trailer are as follows:

Park the truck-tractor and semi-trailer in
a straight line and set the park brakes.
Chock semi-trailer wheel. If you only
have one chock, place it to the front of
the semi-trailer wheel. If you have two
chocks, place one to the front and one
to the rear of the semi-trailer wheel.
Lower the landing gear.
Disconnect the electrical and air lines
and unlock the fifth wheel.
Secure the electrical connection and air
lines to the truck-tractor.
Move the truck-tractor ahead slowly
until the fifth wheel just clears the semitrailer
and stop.
Check that the ground and landing gear
support the semi-trailer.
Move the truck-tractor ahead slowly
until the tractor frame completely clears
the semi-trailer.

Coupling and uncoupling
pintle hitch attachments

The Basic Steps In Uncoupling Pintle Hitch
Attachments Are:

Park the towing/power unit and trailer
in a straight line.
Set the parking brakes of the towing/
power unit and trailer.
Chock trailer wheels.
Disconnect air lines, electrical line and
other associated hoses (if applicable).
Disconnect safety cables/chains from
towing/power unit.
Disconnect safety pin (if equipped).
Release pintle hook locking
(safety latch) mechanism.

Lower landing leg if equipped;
otherwise, block the drawbar
when required.
Move towing/power unit ahead slowly
until pintle eye completely clears
pintle hook.
Stop and visually check that the pintle
eye is free of the pintle hook.

The Basic Steps In Coupling Pintle Hitch
Attachments Are:

Position the towing/power unit in line to
receive the pintle eye.
Stop the towing/power unit before
contact is made with the pintle eye.
Chock trailer wheels.
Ensure pintle hook is open to receive
pintle eye.
Ensure pintle hook and eye has no
cracks and or signs of excessive wear.
Ensure pintle eye is the proper height
to lower onto the pintle hook, adjust
drawbar height if necessary.
Position towing/power unit so the
pintle eye can be lowered onto the
pintle hook.
Snap pintle hook shut and ensure
safety latch is locked.
Properly attach safety cables/chains to
towing/power unit.
Fasten safety pin (if applicable).
44 A Commercial Driverís Guide to Operation, Safety and Licensing

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