TM 9-6115-664-13&P
1-10. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (FIGURE 1-1).
a.
The 5kW, 28VDC, Diesel Engine Driven Auxiliary Power Unit, MEP-952B, hereafter referred to as APU, is
designed to mount on the U.S. Army M1068 tracked vehicle. The APU provides alternate power to the vehicle. The APU
is also capable of remote operation, detached from the vehicle.
b.
The APU consists of an aluminum enclosure assembly (1, Figure 1-1), local control panel assembly (2), remote
control panel assembly (3), fuel module (4), engine exhaust and silencer system (5), single-cylinder diesel engine (6), 6
phase brushless alternator (7), engine oil cooler (8), and associated wiring harnesses, electrical connectors, and fuel
hoses. Two detachable mounting brackets are secured to the front sides of the APU enclosure. Two vertical mounting
brackets are welded to the rear comers of the enclosure. These brackets are used to secure the APU to the M1068
vehicle.
c.
Enclosure Assembly. The enclosure assembly (1, Figure 1-1) supports and protects all APU components.
The enclosure housing is a one-piece aluminum structure and forms the front, back, sides, and base of the enclosure
assembly. A single point lifting device (9) is mounted to the top-center cross member (10). Four tie-down rings (11) are
mounted on the enclosure, two on the nose piece (12) and two on the rear housing panel.
d.
Two liftable lids (13) are mounted to the top of the of the enclosure assembly. Fold-down latches (14) secure
the lids in place during vehicle operation. The lids allow easy access to APU components for inspection, servicing, and
maintenance tasks. The lids and top-center cross member (10) may be removed as an assembly, allowing fast and easy
removal/replacement of the engine and alternator. Two hinged doors (15, 16) located on the sides of the enclosure permit
quick access to the engine. The engine oil filter door (15) opens to allow access to the engine oil filter, engine oil cooler,
and related hoses. The engine valve access door (16) allows access to the engine rocker box and cylinder head for
adjustment procedures.
e.
A slanted nose piece (12) is attached to the front of the enclosure. The nose piece deflects foreign objects that
may come up the front of the vehicle, protecting the APU. A hole in the nose piece allows for insertion of the engine crank
handle, permitting manual start of the engine if required. The oil cooling fan is mounted to the enclosure housing front
panel, behind the nose piece.
f.
A metal exhaust cover (17) is mounted to the left side of the enclosure. The cover protects the exhaust silencer
(18) and exhaust pipe, and prevent personnel from touching hot exhaust components. The cover is closed on the bottom
to ensure that all hot exhaust air escapes upward. A NATO electrical receptacle (19) and fuel fitting (20) are accessed
through recesses located to the left of the exhaust cover.
g.
A cooling air inlet duct (21) is located under the enclosure housing. Two warm air outlet ducts (22) are located
on the sides of the enclosure. Each outlet duct is baffled. The inside of the enclosure and underside of the access lids
are covered with sound-proofing material to reduce noise.
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