TM-9-2320-273-10
TRUCK, TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER
TECHNICAL MANUAL; OPERATOR’S MANUAL
DECEMBER 2012
TM-9-2320-273-10 - Page 182 of 452
EFFICIENT AND ECONOMICAL DRIVING TECHNIQUES (M915 THROUGH M920)
The following driving techniques should be learned to achieve efficiency, economy, and
safe operation in the M915 through M920.
WARNING
Due to increased weight and raised center of gravity on
vehicles equipped with Crew Protection Kit, vehicle operator
must be aware of differences in driving characteristics and
adjust driving accordingly. Failure to comply may result in
damage to equipment or possible injury or death to
personnel. Seek medical attention in the event of an injury.
Driving at Highway Speed
1. When driving conditions permit, maintain the legal highway speed in gear that
permits running the engine below governed speed. This is engine cruising range
and it affords better fuel economy than higher engine speeds. Recommended
normal highway cruising range is 1,800–1,900 rpm.
2. Operate in the economy range at full throttle if satisfied with how the vehicle
performs. There are times when hilly terrain, high winds, or other conditions
make it impractical to operate without reserve power. Such conditions are better
met if the truck is operated in a lower gear with reserve power available for
changes in terrain, wind, etc.
Driving in the City
CAUTION
Engine rpm should not be less than 1,500 rpm for city
driving. Failure to comply may result in damage to
equipment.
1. Operate the truck in high gear at reduced engine rpm to maintain the lawful
speed. Reducing engine speed conserves fuel and lowers the noise level of the
vehicle. When slowing down for towns and other posted speed zones along
highway route, remain in running gear and reduce engine rpm. Avoid
downshifting until ready to return truck to highway speed. Depending on gear
selection recommended rpm range must not be less than 1,500 rpm for city
driving.
TM 9-2320-273-10
0010
0010-16
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