TM 9-2330-388-14
vehicle's fifth wheel hook by pulling out on the Iockjaw
brake hose is uncoupled. Fit dummy couplings on
handle. If the hook is binding and will not release, pull
semitrailer air brake hose couplings. Open drain valves
the hook handle harder to force release. Drive the
on front and rear reservoirs, fig. 2-2.
towing vehicle forward until the semitrailer is disengaged
c.
Disconnect intervehicular cable from receptacle
from the towing vehicle and is resting on its landing gear.
on semitrailer, fig. 2-I.
2-7.
Jacking Procedures
d.
If sand shoes are secured in a swing-a-way
position rearward to the semitrailer, release chain
A jack is not part of the on-vehicle equipment. If you
assembly.
have to change a flat during operations, use the towing
vehicle jack. Place jack under axle on side of semitrailer
e.
Release the landing gear operating crank from
with the flat tire. Jack up axle until both tires on that end
its clip, fig. 2-3. Engage crank on shaft, and rotate the
of axle clear the ground, para 4-51. Replace flat tire and
crank counterclockwise to lower the landing gear until
wheel with spare tire and wheel. When lug nuts have
the foot pads are firmly on either the ground or the
been put on and tightened, lower wheels and remove
ground board, para NO TAG Replace the crank in its clip
jack. Recheck lug nuts for tightness, and stow jack in
and secure.
towing vehicle.
f.
Release the semitrailer kingpin from the towing
Section II. OPERATION OF AUXILIARY EQUIPMENT
2-8.
General Instructions
2-9.
Operation Of Water Dispensing Unit
a.
The engine control panel for M1098 is located on
WARNING
the roadside of the semitrailer. Control functions and
Potable water is to be tested on a daily basis.
gage readings are explained in the following paragraphs.
Refer to FM 21-10 and TB MED 577. Only
food-grade quality gaskets and hoses are to
b.
Emergency Valve Operation. The emergency
be used in dispensing components/lines.
valve controls the tank outlet, fig. 2-5. The emergency
Failure to do so could result in illness to
valve is mechanically operated by a lever in the piping
personnel.
control assembly.
Engaging the lever opens the
emergency valve to permit water flow to/from the tank
2-10.
Operating Terms
sump. At the same time, the vent at the top of the tank
opens
to
relieve
pressure/vacuum
during
An understanding of the following terms may be helpful
loading/unloading.
in the operation, diagnosis and maintenance of the
pump:
(1) The emergency valve must be open for
a.
Engine
all loading/unloading operations except top loading.
Throttle lever: A hand throttle is furnished to control
engine speed and pump pressure.
(2) In an emergency, close the emergency
valve by disengaging operator handle.
Stop lever: A control that cuts off fuel to the fuel injector
and stops the engine.
b.
Turning. When turning corners, remember that
Governor: This engine component limits speed and is set
the semitrailer has a shorter turning radius than the
to factory specifications.
towing vehicle.
To make a right turn at a road
intersection, the towing vehicle must continue forward to
b.
Pump, Potable Water Dispensing
about the center of the crossroads, and then turn sharply
Impeller: The working part of a centrifugal pump which
to the right to allow for the shorter turning radius of the
imparts energy to the water.
semi trailer. To back the semitrailer to the right, turn the
Check Valve: A one-way check valve on the discharge
steering wheel of the towing vehicle to the left or
side of the pump that permits water to flow out only,
counterclockwise. The front of the semitrailer will be
prohibiting excessive pump back pressure.
pushed to the left, and the semitrailer wheels will steer to
the right.
Drain Valve: A valve provided for draining the pump for
storage or cleaning.
2-4
