Moving The Vehicle - General Information; Braking; Shifting - Mack Granite GU Series Operator's Handbook Manual

MOVING THE VEHICLE — GENERAL
INFORMATION

Braking

Avoid sudden stops. Constant sudden stops may negatively affect braking
performance and driving parts. When slowing, leave the clutch (if equipped)
engaged as long as possible to use the braking effect of the engine.
CAUTION
When using the braking effect of the engine, final gear selection is critical. If gear
selection is too high, the vehicle will buck which could cause loss of control.

Shifting

Operate in a gear low enough to allow the engine to accelerate to (or maintain)
governed engine speed when applying full throttle. Allowing the engine to lug
causes excessive strain on the engine, which could damage pistons, rings,
cylinder walls, or bearings. However, be sure not to overspeed the engine.
DANGER
Always select the proper gear ratio BEFORE descending a grade (to avoid a
runaway vehicle and to stay within safe and legal speed limits). Do NOT coast
down hills. Gear ratios should be selected to allow the engine to operate between
peak torque and rated speed.
CAUTION
Do not permit a load to drive the engine above governed speed. When descending
steep grades, use lower gears and watch the tachometer. Overspeeding will cause
severe drivetrain damage and eventually destroy the engine.
OPERATION 185