ARMY TM 9-6115-639-13
AIR FORCE TO 35C2-3-386-51
MARINE CORPS TM 10155A-13/1
1-11. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (Figure 1-2).
The 3kW Tactical Quiet Generator Set, MEP 831A (60 Hz), NSN 6115-01-285-3012, and MEP 832A
(400 Hz), NSN 6115-01-287-2431, hereafter referred to as generator set, is a portable unit capable of being
mounted on a trailer for transportation. The generator set is designed to provide a quiet source of AC power
under temperature ranges from -25 to +120 F (-32 to +49 C), at any level of relative humidity and at altitudes
of up to 8000 feet (2440 meters) above sea level.
The generator set consists of an enclosure assembly (1, Figure 1-2), one-cylinder diesel engine (2),
permanent magnet AC generator (3), control box assembly (18), output / load panel (16), welded skid base
assembly (17), primary and auxiliary fuel systems, enclosure cooling and ventilation system, engine exhaust
assembly, a 24VDC battery, and associated wiring harnesses, electrical connectors, fuel and oil hoses.
a. Enclosure Assembly. The enclosure assembly (1, Figure 1-2) supports the control box assembly,
cooling air system, and exhaust assembly components. It protects the engine, generator, and other internal
components from damage. It incorporates a fire retardant acoustical insulation to reduce noise levels, and acts
as a shield to reduce electromagnetic pulse effects on generator set components.
A hinged cover (4) allows easy access for inspection and maintenance of the generator set system.
Two latches (6) lock the cover in place when it is closed. Air ducts in the cover and enclosure housing allow for
ventilation of hot exhaust air.
b. Enclosure Cooling and Ventilation System. Air intake openings and engine intake ducts at the rear
of the enclosure assembly allow for engine cooling using external air. Two thermostatically controlled fans (5,
Figure 1-2) mounted in the enclosure assembly activate during high temperature conditions to drive hot exhaust
air through openings in the enclosure.
c. Skid Base. The welded skid base (17, Figure 1-2) provides the main structural support for the
generator set. The engine / generator assembly is mounted to the skid base with vibration isolators which isolate
engine generated vibrations from the rest of the generator set. The generator set’s plastic fuel tank is contained
within the skid base, as is the 24VDC battery.
The skid base contains four swing-out lifting handles (7), two standard lifting handles (9), four tie-
down rings (8), and two forklift openings (12). An oil drain plug (10) and fuel drain plug (11) protrude through
openings on the skid base, on the right side of the generator set. A 24VDC slave receptacle (14) and load
terminal connections (behind cover (16)) are mounted to the skid base at the rear of the generator set.
d. Battery. A 24VDC battery, mounted in the skid base, provides cranking power for the engine as well
as DC power for the control system. The battery’s location in the skid base permits easy servicing. Openings in
the enclosure assembly vent escaping battery gases to the atmosphere, preventing gas build-up inside the
enclosure.
e. Exhaust System. The generator set exhaust system (20) consists of a muffler and exhaust piping.
Engine exhaust exits the generator set through an opening in the top of the enclosure assembly. Insulating
material on exhaust system components protects maintenance personnel against potential burn hazards and
reduces heat rejection into the enclosure assembly.
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