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TM 9-2320-360-20-1
1-13. SAFETY, CARE, AND HANDLING (CONT)
Table 1-2. Significant Hazards and Safety Recommendations (Cont)
Operating Hazard
Safety Recommendation or Precaution
Condition*
Connecting/Disconnecting
Make sure that position of assistant is known at all
Normal'
trailer.
times. Make sure no one is standing directly
behind tractor or trailer during connection/
disconnection.
Vehicle instability on a
Avoid driving diagonally across a hill. HET Tractor
Normal
hill.
may roll, causing equipment damage and injury or
death to personnel.
Winching operations.
Do not use winches for lifting personnel. Always
Normal
wear heavy gloves when handling winch cable.
Never let cable run through hands. Frayed cable
can cut severely. Do not operate winch without
guard in place. Do not place hands or feet near
winch during operation. Ensure that both DRIVER
SIDE and PASSENGER SIDE WINCH KICKOUT
controls are disengaged prior to paying out winch
cables. Failure to disengage KICKOUT controls -
may result in injury to personnel.
*Category of hazards as to whether or not they may be expected under normal or abnormal operating conditions.
Section III. PRINCIPLES OF OPERATION
1-14. POWER TRAIN
Power for the HET Tractor is generated by a two-stroke, V-type diesel engine coupled directly to an automatic
transmission. The engine is rated at 500 brake horsepower.
The engine is equipped with an electronic control system that regulates fuel delivery to each injector as well as governing
engine speed for power takeoff operation. Engine sensors and engine performance can be checked using a plug-in
diagnostic reader.
Power from the engine drive shaft transmits torque that is multiplied for greater drive power by a torque converter when
needed.
Five forward drive ranges can be manually selected, depending on the terrain and conditions. The transmission will
automatically downshift as engine speed and throttle position change.
When the lockup clutch is automatically applied, power is transmitted mechanically through the lockup clutch. A direct
drive is engaged from the engine to a converter turbine shaft.
Power from the transmission is directed to the transfer case and propeller shafts forward and rear. The front and rear
tridem axles are each equipped with planetary wheel ends. In low range, driver-controlled lockouts in the differentials
provide positive drive to all four axles.
1-4
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