Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
DRIVING TIPS AND TECHNIQUES Refer to the Engine Operation and Maintenance manual for optimum engine rpm. • If the engine rpm moves beyond the maximum governed speed, indicating an overspeed condition, apply the service brake or shift to a higher gear to bring engine 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 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. STARTING AND OPERATING THE VEHICLE • 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. WARNING! Do not exceed the specified load rating. Overloading can result in loss of vehicle control and an accident causing death or personal injury, either by causing component failures or by affecting vehicle handling. Exceeding load ratings can also shorten the service life of the vehicle. • The components of your vehicle are designed to provide satisfactory service if the vehicle is not loaded in excess of either the gross vehicle weight rating (GVWR), or the maximum front and rear gross axle weight ratings (GAWRs). (Axle weight ratings are listed on the driver's door edge.) NOTE: For your safety and the safety of others, follow routine and periodic maintenance schedules for all components on your vehicle. See Table 3, “Maintenance Schedule,” Page 123 – 132 – Y53-6027 Medium Duty (R05/09)
STARTING AND OPERATING THE VEHICLE DRIVING TIPS AND TECHNIQUES Air Suspension Height/Air Pressure Your vehicle may have an air suspension. A deflation switch on the dash allows you to exhaust the air in the suspension, which allows you to lower the height of your vehicle for loading. On tractors, the deflate switch allows you to lower the fifth wheel to slide under a trailer. A guard on the switch prevents you from accidentally deflating the suspension. WARNING! Do not operate the Air Suspension Deflate Switch (Dump Valve) while driving. Sudden deflation while your vehicle is moving can affect handling and control and could lead to an accident possibly resulting in death or personal injury. Use this switch only when your vehicle is not moving. CAUTION: Operating a vehicle with air suspension bags either overinflated or underinflated may cause damage to driveline components. If a vehicle must be operated under such conditions, do not exceed 5 mph (8 km/h). AIR SUSPENSION Air Suspension Deflate Switch Setting Ride Height Vehicles equipped with rear air suspensions have their ride height and axle (pinion) angle(s) preset at the factory. These are precision settings and should not be altered. Incorrectly adjusted ride height may result in improper interaxle U-joint working angles. This can result in premature driveline wear and driveline vibration. If your vehicle is equipped with a Peterbilt rear air suspension, and if it becomes necessary to reset the ride height, you may temporarily set it by following the next procedure. Proper ride height measurement and values are shown in the illustration and table below. Medium Duty (R05/09) Y53-6027 – 133 –
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DRIVING TIPS AND TECHNIQUES<br />
Refer to the Engine Operation and Maintenance manual<br />
for optimum engine rpm.<br />
• If the engine rpm moves beyond the maximum governed<br />
speed, indicating an overspeed condition,<br />
apply the service brake or shift to a higher gear to<br />
bring engine rpm within the optimum speed range.<br />
• When driving downhill: shift to a lower gear, use the<br />
engine brake (if so equipped), and use the service<br />
brake, keeping the engine speed below 2,100 rpm.<br />
When the engine speed reaches its maximum governed<br />
speed, the injection pump governor cuts off fuel to the<br />
engine. However, the governor has no control over the<br />
engine rpm when it is being driven by the vehicle's transmission,<br />
for example, on steep downgrades. Apply service<br />
brakes or shift to a higher gear.<br />
Fuel economy and engine performance are also directly<br />
related to driving habits:<br />
• The best results in trip time and fuel economy are<br />
obtained while driving the vehicle at a steady speed.<br />
STARTING AND OPERATING THE VEHICLE<br />
• Shift into higher or lower gears (or apply the service<br />
brake) to keep engine rpm near the lower end of the<br />
optimum operating range.<br />
• Avoid rapid acceleration and braking.<br />
WARNING! Do not exceed the specified load<br />
rating. Overloading can result in loss of vehicle<br />
control and an accident causing death or<br />
personal injury, either by causing component<br />
failures or by affecting vehicle handling.<br />
Exceeding load ratings can also shorten the<br />
service life of the vehicle.<br />
• The components of your vehicle are<br />
designed to provide satisfactory service if<br />
the vehicle is not loaded in excess of either<br />
the gross vehicle weight rating (GVWR), or<br />
the maximum front and rear gross axle<br />
weight ratings (GAWRs). (Axle weight ratings<br />
are listed on the driver's door edge.)<br />
NOTE: For your safety and the safety of others,<br />
follow routine and periodic maintenance schedules<br />
for all components on your vehicle. See<br />
Table 3, “Maintenance Schedule,” Page 123<br />
– 132 – Y53-6027 <strong>Medium</strong> <strong>Duty</strong> (R05/09)