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

  TM-9-2320-273-10 - Page 188 of 452

EFFICIENT AND ECONOMICAL DRIVING TECHNIQUES (M915A1) - CONTINUED
Driving in City Stop-and-Go Traffic
CAUTION
Operating tractor below 1,500 rpm in gear range 1-5 will lug
the engine, and is not recommend for city driving. Failure to
comply may result in damage to engine.
1. Operate the vehicle in gear range 1-5 (Figure 14, Item 1) or 1-4
(Figure 14, Item 2) for normal stop-and-go city driving. Operating in gear range
1-5 (Figure 14, Item 1) or 1-4 (Figure 14, Item 2) when conditions permit, will
lower engine speed and increase fuel economy. Vehicle should not be operated in
high gear ranges at engine speeds below 1,500 rpm for city driving.
NOTE
The automatic transmission can be manually upshifted
through all gear ranges while accelerating at full throttle.
Manually down shifting is limited to the maximum allowable
engine speed for the next lower gear range. However, if a
manual down shift or reverse shift is made at too high a road
speed, the transmission hydraulic system will prevent the
shift from occurring until the maximum lower speed is
reached.
2. If traffic, road, or load conditions warrant, it may be desirable to limit the
automatic upshift by selecting gear range 1-3 (Figure 14, Item 3). This prevents
the engine from running below 1,500 rpm in gear range 1-4 (Figure 14, Item 2) or
1-5 (Figure 14, Item 1) at slower road speeds. When conditions allow for faster
road speeds, manually upshift to gear range 1-4 (Figure 14, Item 2) followed by
1-5 (Figure 14, Item 1). This practice lowers engine speed and provides increased
fuel economy.
Hauling on Uphill Grades
CAUTION
Use service brakes to hold tractor while stopped on a grade.
Never use the transmission to hold tractor on grade or severe
overheating and damage to transmission will result.
1. When starting from a stop on maximum uphill grades pulling maximum load, use
gear range 1 (Figure 14, Item 4), accelerate at full throttle, and manually upshift
once engine speed reaches 2,000 rpm one gear range at a time. If uphill grade
prevents engine speed from reaching 1,700 rpm, downshift to next lower gear
range to maintain at least 1,700 rpm.
TM 9-2320-273-10
0010
0010-22


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