TM 9-2320-283-10
USE OF CHOCK BLOCKS WHEN 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 block-
ed; if one side is blocked at the tire’s front, the opposite side should be blocked at
the tire’s rear.
EQUIPMENT CHECKS
Check out your equipment as follows before backing under the semitrailer.
a. Visually check the fifth wheel for cracked, damaged or missing parts,
b. Check mountings for good condition and mounting bolts for tightness.
c. Check that all moving parts and top of fifth wheel are properly lubricated.
d. Check the lock guard for proper operation. Have it replaced if it is damaged or
missing. Make sure both Primary Lock Release Pull Ring and Secondary Lock
Release Handle are pulled out and lock guard is open to accept the trailer kingpin.
e. Be sure that the fifth wheel ramps are down level with, or slightly below the
angle of the pickup ramps.
f.
Prepare the semitrailer for coupling. Adjust the trailer height so that the fifth wheel
picks up the trailer on the fifth wheel ramps.
g. Be sure fifth wheel air slide control is set to the LOCK position
TA 236678
2-72
