TM 9-2330-294-14
b. Fail-safe Brake Release Control Knob. The fail-
4) are located at the front of the gooseneck; one
safe brake release control knob is located on the
provides protection for the right-side taillights and
clearance lights and the other for the left-side
frame left side member forward of the service brake
release knob and is identified by an identification
taillights and clearance lights. The semitrailer is
plate. Pushing in the fail-safe release control knob
equipped with two composite taillights (fig. 2-5) and
routes air from the fail-safe release system reservoir
to the fail-safe units and forces the power springa to
composite taillight is composed of a taillight,
retract from the applied position. This allows the
stoplight, turn light and marker light. One utility
semitrailer to be moved in an emergency when the
outlet (fig. 2-5) is provided at the rear of semitrailers
hake air system is disabled. When captive air
No. 201 and on for use with the M746 towing vehicle
pressure is insufficient to unlock the fail-safe units,
floodlight or other auxiliary electrical equipment.
the release system reservoir can be independently
Semitrailers No. 1 through 200 are equipped with
recharged by any outside compressed air source. The
three utility outlets, one on each side by the
air reservoir fill valve is adjacent to the failsafe
clearance lights and one at the rear of the vehicle. A
release control knob. This knob is automatically
threaded cover, secured by a chain, protects the
reset to the "out" position when the brake air system
outlet(s) when not in use. The towing vehicle light
is pressurized.
switch must `be set in "SER DRIVE" position to
activate the utility outlet(s). Semitrailers No. 1
through 200 have a low pressure warning switch,
All semitrailer lights and the utility outlet(s) are
located on the main beam at the left rear of the
operated by switches in the cab of the towing
semitrailer, it is electrically operated and is activated
vehicle. A standard military, 12-pin, intervehicular
by a low pressure condition in the semi-trailer air
electrical receptacle (fig. 2-4) located at the front of
system. The low pressure warning is indicated only
the semitrailer provides an electrical power inlet
in the cab of the M746 towing vehicle when towing
from the towing vehicle. Two circuit breakers (fig. 2-
semitrailers No. 1 through 200.