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Commercial driver's guide to operation, safety and licensing

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Uncoupling<br />

The basic steps for uncoupling a trucktrac<strong>to</strong>r<br />

from a semi-trailer are as follows:<br />

Park the truck-trac<strong>to</strong>r <strong>and</strong> semi-trailer in<br />

a straight line <strong>and</strong> set the park brakes.<br />

Chock semi-trailer wheel. If you only<br />

have one chock, place it <strong>to</strong> the front of<br />

the semi-trailer wheel. If you have two<br />

chocks, place one <strong>to</strong> the front <strong>and</strong> one<br />

<strong>to</strong> the rear of the semi-trailer wheel.<br />

Lower the l<strong>and</strong>ing gear.<br />

Disconnect the electrical <strong>and</strong> air lines<br />

<strong>and</strong> unlock the fifth wheel.<br />

Secure the electrical connection <strong>and</strong> air<br />

lines <strong>to</strong> the truck-trac<strong>to</strong>r.<br />

Move the truck-trac<strong>to</strong>r ahead slowly<br />

until the fifth wheel just clears the semitrailer<br />

<strong>and</strong> s<strong>to</strong>p.<br />

Check that the ground <strong>and</strong> l<strong>and</strong>ing gear<br />

support the semi-trailer.<br />

Move the truck-trac<strong>to</strong>r ahead slowly<br />

until the trac<strong>to</strong>r frame completely clears<br />

the semi-trailer.<br />

Coupling <strong>and</strong> uncoupling<br />

pintle hitch attachments<br />

The Basic Steps In Uncoupling Pintle Hitch<br />

Attachments Are:<br />

Park the <strong>to</strong>wing/power unit <strong>and</strong> trailer<br />

in a straight line.<br />

Set the parking brakes of the <strong>to</strong>wing/<br />

power unit <strong>and</strong> trailer.<br />

Chock trailer wheels.<br />

Disconnect air lines, electrical line <strong>and</strong><br />

other associated hoses (if applicable).<br />

Disconnect <strong>safety</strong> cables/chains from<br />

<strong>to</strong>wing/power unit.<br />

Disconnect <strong>safety</strong> pin (if equipped).<br />

Release pintle hook locking<br />

(<strong>safety</strong> latch) mechanism.<br />

Pintle hitch with hook <strong>and</strong> eye<br />

Lower l<strong>and</strong>ing leg if equipped;<br />

otherwise, block the drawbar<br />

when required.<br />

Move <strong>to</strong>wing/power unit ahead slowly<br />

until pintle eye completely clears<br />

pintle hook.<br />

S<strong>to</strong>p <strong>and</strong> visually check that the pintle<br />

eye is free of the pintle hook.<br />

The Basic Steps In Coupling Pintle Hitch<br />

Attachments Are:<br />

Position the <strong>to</strong>wing/power unit in line <strong>to</strong><br />

receive the pintle eye.<br />

S<strong>to</strong>p the <strong>to</strong>wing/power unit before<br />

contact is made with the pintle eye.<br />

Chock trailer wheels.<br />

Ensure pintle hook is open <strong>to</strong> receive<br />

pintle eye.<br />

Ensure pintle hook <strong>and</strong> eye has no<br />

cracks <strong>and</strong> or signs of excessive wear.<br />

Ensure pintle eye is the proper height<br />

<strong>to</strong> lower on<strong>to</strong> the pintle hook, adjust<br />

drawbar height if necessary.<br />

Position <strong>to</strong>wing/power unit so the<br />

pintle eye can be lowered on<strong>to</strong> the<br />

pintle hook.<br />

Snap pintle hook shut <strong>and</strong> ensure<br />

<strong>safety</strong> latch is locked.<br />

Properly attach <strong>safety</strong> cables/chains <strong>to</strong><br />

<strong>to</strong>wing/power unit.<br />

Fasten <strong>safety</strong> pin (if applicable).<br />

44 A <strong>Commercial</strong> Driver’s Guide <strong>to</strong> Operation, Safety <strong>and</strong> Licensing

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