c. Disconnect intervehicular cable from receptacle
Never use the air brakes on the semitrailer
If sand shoes are secured in a swing-a-way posi-
when parking If the brake drums are hot. The
tion rearward to the semitrailer, release chain assembly.
brake drums will contract (shrink) as they
e. Release the landing gear operating crank
cool and may crack as the applied brakes
(fig. 2-3) from its clip, engage crank
on shaft, and rotate
prevent normal contracting.
the crank counterclockwise to lower the landing gear
(para 2-3) until the foot pads are firmly
on either the
Parking. When the towing-vehicle-with-semitrail-
ground or the ground boards. Replace the crank in its clip
er combination is to be parked and left unattended, set the
hand brake firmly.
f. Release the semitrailer kingpin from the towing
vehicle's fifth wheel hook by pulling out on the lockjaw
Uncoupling Semitrailer From Towing Vehicle
handle. If the hook is binding and will not release, pull the
hook handle harder to force release. Drive the towing
a. If the semitrailer is to be uncoupled in mud, sand,
vehicle forward until the semitrailer is disengaged from
or snow, or if the towing vehicle is an M931A1 or M932A1,
the towing vehicle and is resting on its landing gear.
position ground boards approximately centered beneath
landing gear shoes.
Close the shut-off valves on the service and
A jack is not part of the on-vehicle equipment. If you have
emergency air lines at the rear of the towing vehicle.
to change a flat during operations, use the towing vehicle
Uncouple the two air brake hoses from the air brake hose
jack. Place jack under axle on side of semitrailer with the
couplings on the semitrailer (fig. 2-1). The semitrailer
flat tire. Jack up axle until both tires on that end of axle
brakes will set automatically when the emergency air
clear the ground. Replace flat tire and wheel with spare
brake hose is uncoupled. Fit dummy couplings on
tire and wheel. When lug nuts have been put on and
semitrailer air brake hose couplings. Open drain valves on
tightened, lower wheels and remove jack. Recheck lug
nuts for tightness, and stow jack in towing vehicle.
Section II. OPERATION OF AUXILIARY EQUIPMENT
General Instructions - Fuel Handling (All
Ladder has narrow tread. Use care when climbing.
Always connect a static ground line to the ve-
hicle, storage facility, aircraft, or equipment
being serviced. If portable ground is used,
Follow all fuel handling procedures precisely
make sure a good connection is made.
to prevent injury or death to personnel.
a. Safety Precautions. It is important that all fuel
(1) Bonding is electrically connecting units or
handling and operating procedures be followed precisely.
containers both to equalize any static potential that might
A detailed study of FM 10-20, FM 10-68, FM 10-69, and
exist before operations begin and to provide a continuous
FM 10-71 is essential for all fuel servicing operations.
path for any static electricity that might be generated after
(2) Grounding is electrically connecting single or
Ensure that grounding connections are made
bonded units to a ground rod to discharge into the earth
properly and firmly before any fueling opera-
any static potential that might already exist or that might
tions begin. This will ensure that grounding
connections will not release, thus eliminating
(3) If two or more units are bonded, and one is
the possibility of sparks caused by static
grounded, the whole system is effectively grounded.