TROUBLESHOOTING THE HMMWV - OD1616 - LESSON 1/TASK 1
also serves to dampen engine noise.
The exhaust system consists of
exhaust manifolds, a crossover pipe, a muffler, and a tail pipe.
Exhaust components are constructed of aluminized and stainless steel
for corrosion protection.
The exhaust crossover pipe is bolted to
the exhaust manifolds. The muffler is a revere-flow double-pass and
is mounted between the frame rails. The tail pipe is routed in front
of the left rear wheels and out to the side of the vehicle.
4.
Drive Train
a.
The function of the drive train is to transmit the power of the
engine to the wheels.
In a simple situation, a set of gears or a
chain could easily perform this task, but automotive vehicles usually
are not designed for such simple operating conditions.
They are
designed to have a great deal of pulling power, move at high speeds,
travel in reverse as well as forward, and operate on rough ground as
well as smooth roads. To meet these widely varying demands, a number
of units have been added.
These include clutches, transmissions,
auxiliary transmissions, transfer cases, propeller shafts, universal
joints, differentials, final drives, live axles, devices for
resisting drive torques and thrust, and the bearings used therein.
b.
Components of the Drive Train.
The drive train on the HMMWV
consists of seven components that work together to transmit power to
the wheels. In the paragraphs that follow, each of these components
will be discussed.
(1) Engine. The first component in the HMMWV drive train is the
engine. However, since the engine was discussed previously, it will
not be discussed here.
(2) Transmission. The HMMWV family of vehicles are equipped with
a
series
400
hydromatic
automatic
transmission
(THM
400),
manufactured by General Motors, with some parts from the 475
hydromatic transmission. The transmission holds six quarts of Dexron
II transmission fluid and maintains an operating pressure of 55-160
psi.
The transmission contains a three element torque convertor, compound
planetary gear set, three
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