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Home > Ordnance Documents and other related manuals > > Transfer Case
Drive Train
Axle Half Shafts.

Troubleshoot The High Mobility Multi- Purpose Wheeled Vehicle (HMMWV)
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TROUBLESHOOTING THE HMMWV - OD1616 - LESSON 1/TASK 1
multiple disc clutches, one sprag and one roller, and two friction
bands.
The  torque  convertor  smoothly  couples  the  engine  to  the
planetary  gear  through  oil,  and  hydraulically  provides  additional
torque multiplication when required.  The compound planetary gear set
gives three forward ratios and one reverse.  The changing of the gear
ratios is fully automatic in relation to vehicle speed and engine
torque input.
The torque from the engine is transmitted to the
transmission through the flex plate.  Vehicle speed and engine torque
signals are constantly fed to the transmission to provide the proper
gear ratio for maximum efficiency and performance at all throttle
openings.
(3) Transfer  Case.
The  transfer  case
directs  engine-to-
transmission
power
to
the
front
and
rear
differentials
simultaneously.  This condition means the vehicle is always in four-
wheel drive.  The transfer case allows for selection of three driving
ranges and a neutral position.
The transfer case used on the HMMWV
is  a  New  Process  218  (MOD),  two-speed,  locking,  chain-driven
transfer.
The  transfer  case  holds  3.5  quarts  of  Dexron  II
transmission fluid.
Driving Ranges.
There are four shift lever positions for transfer
case drive ranges.  The first is "L" which represents low lock.  This
position is used only when the vehicle is climbing or descending
steep hills, or operating in deep mud, sand, and snow.
The second
position is the "N" or neutral position.  This position is used when
the vehicle is disabled and must be towed.  The next position is "H"
or  high.
This  is  used  when  operating  the  vehicle  under  normal
driving conditions and when fording.  The last position is the "H/L"
or high lock position which is used when driving through mud, sand,
snow, off road, or any other slippery road conditions.
(4) Propeller  Shafts.
Two  tubular  propeller  shafts  link  the
transfer case to the differentials.
Universal joints, located at
both  ends  of  the  front  and  rear  propeller  shafts,  permit  inline
driving power between the transfer case and the differentials even
though they are mounted at different angles.
(5) Differentials.  The differential is a gear system that divides
torque between the axle shafts
13






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