Downhill Operation - Navistar MaxxForce DT Operation And Maintenance Manual

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General guidelines for correct road operation
1. Use the lowest gear to get the vehicle moving. This allows
the engine to more easily move the load.
2. Accelerate smoothly and evenly to engine's rated speed.
Rapid acceleration causes high fuel consumption.
3. To prevent lugging, do not allow engine speed to drop below
1,200 rpm during full throttle.
4. When approaching a hill, press accelerator smoothly to start
the upgrade at full power. Downshift to maintain maximum
vehicle speed.
Page 56
SECTION 4 – ENGINE OPERATION

DOWNHILL OPERATION

Protect your engine when driving downhill as follows:
CAUTION
To prevent engine damage when driving downhill,
do not operate the engine above high idle.
Prevent overspeeding of engine when going down long
and steep grades.
Operate the engine closest to high idle for maximum
retarder system operation.
See Vehicle Operator Manual for engine retarder system
operation procedures.

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