Dual Steer Vehicle Operation
PART 7: STARTING & OPERATING THE VEHICLE
NOTE: Often these recommendations are sec-
ondary to maintaining an adequate and safe speed
relative to the surrounding traf
fi
c and road condi-
tions.
Operate the engine within the optimum engine rpm range
and do not allow the rpm’s to exceed the maximum gov-
erned speed. See your Engine Operation and Maintenance
manual for information regarding engine rpm. When the
engine is used as a brake to control vehicle speed (e.g.,
while driving down a grade), do not allow the engine rpm
to exceed maximum governed speed.
Under normal load and road conditions operate the engine
in the lower end of the range.
Use of Tachometer
The tachometer is an instrument that aids in obtaining the
best performance of the engine and manual transmission,
serving as a guide for shifting gears.
Refer to the
Engine Operation and Maintenance
manual for
optimum engine rpm.
• If the engine rpm moves beyond the maximum gov-
erned speed, indicating an overspeed condition, apply
the service brake or shift to a higher gear to bring en-
gine rpm within the optimum speed range.
• When driving downhill: shift to a lower gear, use the
engine brake (if so equipped), and use the service
brake, keeping the engine speed below 2,100 rpm.
When the engine speed reaches its maximum governed
speed, the injection pump governor cuts off fuel to the en-
gine. However, the governor has no control over the engine
rpm when it is being driven by the vehicle’s transmission,
for example, on steep downgrades. Apply service brakes
or shift to a higher gear.
Fuel economy and engine performance are also directly
related to driving habits:
• The best results in trip time and fuel economy are ob-
tained while driving the vehicle at a steady speed.
• Shift into higher or lower gears (or apply the service
brake) to keep engine rpm near the lower end of the
optimum operating range.
• Avoid rapid acceleration and braking.
Dual Steer Vehicle Operation
Dual steer vehicles are equipped with dual-control elec-
tronic shift controls that may have an auto neutral control
– 106 –
Y53-6015
R(08/07)
Summary of Contents for Peterbilt 320
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Page 210: ...PART 11 SUBJECT INDEX Windshield Washer Reservoir 29 206 Y53 6015 R 08 07 ...
Page 212: ...Peterbilt Motors Company P O Box 90208 Denton Texas 76202 ...