Medium Duty Operator's Manual - Peterbilt Motors Company
Medium Duty Operator's Manual - Peterbilt Motors Company Medium Duty Operator's Manual - Peterbilt Motors Company
DRIVING TIPS AND TECHNIQUES STARTING AND OPERATING THE VEHICLE 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. 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. – 130 – Y53-6008A Medium Duty (R05/09)
STARTING AND OPERATING THE VEHICLE DRIVING TIPS AND TECHNIQUES WARNING! To prevent possible injury and damage to property, ensure that a vehicle is parked and the wheels chocked before beginning this procedure. CAUTION: Completing this procedure will enable you to safely reach the nearest authorized Peterbilt repair facility to have ride height and pinion angle reset using the proper equipment and technique. Do this as soon as possible to avoid potential driveline damage. NOTE: Suitable wheel chocks are at a minimum an 18-inch (46 cm) long 4x4. Ride Height Measurement (Location for Tandem Axles Shown) Proprietary Rear Ride Height [inches (mm)]* Air Suspension Single Drive Tandem Drive Air Trac 11.00 (279) 11.00 (279) Low Air Leaf 6.50 (165) 8.50 (216) *These values are for a fully laden vehicle Follow this procedure to temporarily set ride height. 1. Ensure that the air supply and delivery plumbing of the height control valve is consistent with the illustration. NOTE: At least one of the mounting holes in the height control valve bracket will be slotted to permit rotating the valve. NOTE: On dual-valve systems, begin with the LH valve on the next step. 2. Loosen the fasteners mounting a height control valve to its bracket. Medium Duty (R05/09) Y53-6008A – 131 –
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DRIVING TIPS AND TECHNIQUES<br />
STARTING AND OPERATING THE VEHICLE<br />
Air Suspension Height/Air Pressure<br />
Your vehicle may have an air suspension. A deflation<br />
switch on the dash allows you to exhaust the air in the<br />
suspension, which allows you to lower the height of your<br />
vehicle for loading. On tractors, the deflate switch allows<br />
you to lower the fifth wheel to slide under a trailer.<br />
A guard on the switch prevents you from accidentally<br />
deflating the suspension.<br />
WARNING! Do not operate the Air Suspension<br />
Deflate Switch (Dump Valve) while driving.<br />
Sudden deflation while your vehicle is moving<br />
can affect handling and control and could<br />
lead to an accident. Use this switch only when<br />
your vehicle is not moving.<br />
CAUTION: Operating a vehicle with air suspension<br />
bags either overinflated or underinflated<br />
may cause damage to driveline<br />
components. If a vehicle must be operated<br />
under such conditions, do not exceed 5 mph<br />
(8 km/h).<br />
AIR SUSPENSION<br />
Air Suspension Deflate Switch<br />
Setting Ride Height<br />
Vehicles equipped with rear air suspensions have their<br />
ride height and axle (pinion) angle(s) preset at the factory.<br />
These are precision settings and should not be altered.<br />
Incorrectly adjusted ride height may result in improper<br />
interaxle U-joint working angles. This can result in premature<br />
driveline wear and driveline vibration. If your vehicle<br />
is equipped with a <strong>Peterbilt</strong> rear air suspension, and if<br />
it becomes necessary to reset the ride height, you may<br />
temporarily set it by following the next procedure. Proper<br />
ride height measurement and values are shown in the<br />
illustration and table below.<br />
– 130 – Y53-6008A <strong>Medium</strong> <strong>Duty</strong> (R05/09)
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