REVIEW OF DRIVING GUIDELINES

TM 9-2320-273-10

(a) Apply engine retarder (place switch in high mode).

(b) Upshift as engine speed approaches 2,100 RPM. Prior to each

upshift, release engine retarder.

directional control of vehicle.

Excessive use of the service brake to control

downhill speed will result in loss of braking

power because of heat build-up.

REVIEW OF DRIVING GUIDELINES

a. After prolonged engine idle or after using the PTO (M916 through M920), run the

engine up to full rprn momentarily to clean engine.

b. The most practical engine rpm cruising speed for the highway is one that permits

the legal roadspeed and also fuel economy. The recommended cruising range for

the highway is 1,800 to 1,900 rpm.

c. In the city and other reduced speed zones, match engine speed to the lower load

requirement to conserve fuel and lower vehicle noise level. Select a gear that

permits operating in the range of not less than 1,500 rpm.

d. When downshifting for power on a grade, wait for your shift points before making

the shift. You will save both time and fuel if you do. If you maintain a satisfactory

engine rpm on a grade in your crusing gear, it is not necessary to downshift at all.

e. DO not overspeed the engine. Never allow the engine to be pushed above govern-

ed rpm when rolling down a grade.

f. Progressive downshifting and use of the engine retarder, when starting down a

grade from the top of a hill, will provide better control around curves and turns and

will save brakes.

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