DRIVING TIPS AND TECHNIQUES PART 7: STARTING & OPERATING THE VEHICLE
– 142 – Y53-6032 (05/10)
Refer to the Engine Operation and Maintenance manual
for optimum engine rpm.
• If the engine rpm exceeds the maximum governed
speed, apply the service brake or shift to a higher
gear to lower engine rpm.
• 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.
NOTE: Vehicles with an Eaton Ultrashift®
Transmission mated to a Caterpillar or Cum-
mins Engine will automatically shift to a higher
gear (even in manual mode) if an engine over-
speed condition exists.
When the engine speed reaches its maximum governed
speed, the injection pump governor cuts off fuel to the
engine. However, the governor has no control over the
engine rpm when it is being driven by the vehicle's trans-
mission, 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
obtained 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.
Y53-6032.book Page 142 Monday, May 24, 2010 3:37 PM
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