TM 9-2320-363-10
2-18. DRIVING TIPS (Con’t).
DO NOT use engine brake if road surfaces are slippery.
Use of engine brake on wet, icy, or snow-covered roads
could result in loss of vehicle control. Failure to follow
this warning could result in death or injury to personnel
or damage to equipment.
(4)
Use Engine as a Braking Force. The vehicle is equipped
with an engine braking system that enables the engine to act as a brake. The engine
brake should be used for descending grades and is most effective between 1750-
2100 rpm.
(a)
If maximum engine braking is required, turn both engine
brake selection switches up to engage six cylinders.
(b) If less than maximum engine braking is required, turn
left engine brake selection switch up and right engine brake selection switch down to
engage two cylinders, or left engine brake selection switch down and right engine
brake selection switch up to engage four cylinders.
(5)
Downhill Braking.
(a) Select a gear that allows engine, with engine brake
applied, to control vehicle speed with engine rpm at or below 2100 rpm without apply-
ing service brakes. As downgrade is approached, progressively select a gear that,
when combined with engine brake, will allow you to maintain engine speed of 1750-
2100 rpm.
(b) As engine speed exceeds 2100 rpm, use one positive
application of service brakes to slow engine speed to 1650 rpm, release engine
brake, downshift one gear, and apply engine brake. Repeat this procedure until
engine speed can be maintained at 1750 - 2100 rpm.
Excessive use of service brake to control downhill
speed will result in loss of braking power due to heat
build-up.
(c) If you experience a total loss of braking due to heat
build-up, apply engine brake (six cylinders), upshift as engine speed approaches
2100 rpm, and in Drive (D) position continue to apply engine brake and maintain
directional control of vehicle.
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