MAKING SEMITRAILER CONNECTIONS (Cont)

TM 9-2320-273-10

Proper use of chock blocks will prevent damage to

equipment. Use chock blocks in the manner described

in the note below.

NOTE

On semitrailers equipped with chock blocks, block the

wheels as follows.

COUPLING

Remove chock blocks from their brackets and place them

firmly behind the wheels on both sides of the semitrailer.

On level ground, wheels of one axle should be blocked;

if one side is blocked at the tire's front, the opposite side

should be blocked at the tire's rear.

UNCOUPLING

Place chock blocks firmly behind wheels on both sides

of the semitrailer when parking uphill. Place blocks in

front of wheels on a downgrade. On level ground

wheels should be blocked on one side in front and one

side in rear.

a. Pull out the trailer air supply valve.

b. Apply the parking brakes, verifying that the parking brake indicator light comes on.

This will keep your tractor from running out from under the semitrailer when yoU

unlock the fifth wheel.

c. Lower the semitrailer landing gear.

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