MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company

Operating Instructions
• 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
engine. 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
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.
More Driving Tips and Techniques
Fuel — Excess Consumption
The vehicle’s fuel consumption is connected to three important
factors: maintenance, driving habits, and general condition
of the road, traffic conditions, and vehicle load.
Maintenance
Proper maintenance will keep the vehicle running like new
even after long periods of use. The driver must perform the
daily and weekly checks of the vehicle. See “Driver's Check
List” on page 12.
Maintenance factors affecting fuel consumption:
• air and/or fuel filters partially clogged
• engine valves out of adjustment
• injection pump improperly synchronized
• injection nozzles defective or uncalibrated
• improperly inflated tires
• wheel bearings improperly adjusted
• clutch improperly adjusted or worn (slipping)
• fuel leaks
Model 330 PB1318 3/01 – 99 –