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 183 of 452

EFFICIENT AND ECONOMICAL DRIVING TECHNIQUES (M915 THROUGH M920) -

CONTINUED

Hauling Uphill

1. The engine works hardest when moving loaded truck up a grade. The proper use

of gears shortens time on hills and minimizes the amount of shifting.

2. Proceed uphill and depress the accelerator pedal completely, keeping it there as

the truck moves up the grade. If there is sufficient power to maintain a

satisfactory rpm, remain in that gear for the entire grade.

3. If the hill causes a steady decline in engine rpm, downshift when engine rpm is at

or below 1,650 rpm. Continue to downshift in this manner until engine rpm can

be maintained.

4. By remaining in each gear until arriving at the next lower shift point, truck will

top the grade in the best possible time on less fuel and fewer shifts.

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