OPERATOR'S MANUAL
Table Of Contents
- How to Use This Manual
- Safety Signals
- Vehicle Safety
- How to Find What You Want
- A Special Word About Repairs
- Shop Manuals
- Preventive Maintenance Section
- Additional Sources of Information
- Start–Up
- Instruments and Controls
- Introduction
- Warning Lights and Buzzer
- Self Test
- Speedometer and Odometer
- Tachometer
- Coolant (Water) Temperature Gauge
- Engine Oil Pressure Gauge
- Dual Air Pressure Gauge (Air Reservoir)
- Fuel Gauge
- Voltmeter (option)
- Transmission Temperature Gauge (option)
- Air Filter Restriction Indicator (option)
- Headlight Switch
- Daytime Running Lights (option)
- Panel Lights
- ID and Clearance Lights
- Windshield Wipers/Washer
- Ignition Key Switch
- Parking Brake
- Cruise Control Switch
- Hand Throttle Control
- Heating and Air Conditioning
- Accessories
- Seats
- Steering Column and Mirrors
- Operating the Engine
- Operating the Transmission
- Using the Brake System
- Operating the Rear/Drive Axle
- More Driving Tips and Techniques
- Vehicle Recovery and Spring Brakes
- Shut–Down
- Introduction
- Maintenance Schedule and Lubrication
- Engine Maintenance
- Cooling System
- Brake System
- Air System
- Tires and Wheels
- Heater and Air Conditioner
- Electrical System
- Cab Maintenance
- Transmission and Clutch
- Steering and Driveline
- Front Axle and Suspension
- Rear Axle and Suspension
- Frame and Fifth Wheel
- Noise and Emission Control
- Consumer Information and Vehicle Identification
Tires and Wheels Preventive Maintenance
– 174 –
PB1318 3/01 Model 330
damage to the wheel assembly. Do not forget to check
between dual wheels. If you find wheel damage, have an
expert tire service repair it.
WARNING! Do not repair damaged tires unless
you are fully qualified and equipped to do so.
Wheel and tire assemblies cannot be worked on
without proper tools and equipment, such as:
safety cages or restraining devices. Have all tire
repairs performed by an expert. And stand away
from the tire assembly while the expert is work-
ing.
CAUTION: Pressure should be checked when
the tires are cool. Warm or hot tires cause pres-
sure buildup and will give you an inaccurate
reading. So never deflate a warm tire to the
specified pressure.
Underinflated tires will adversely affect the operation of
the vehicle and tires:
• making steering difficult
• causing extra strain on the tire sidewalls
• reducing the tread life of tires due to the high tempera-
tures generated from excess flexing of the tire
• Inflate tires to the manufacturer's cold air pressure spec-
ification molded into the tire side wall.
Lower tire pressure does not give you more traction on ice or
snow. Underinflation actually reduces traction and steering
control. See the tire manufacturer's
Drivers Handbook
for
more information on proper operation and use of tires.
Proper Inflation
: the correct
profile for full contact with the
road.
Underinflation
: causes abnor-
mal tire deflection, which builds
up excessive heat, running the
risk of failure. It also causes
irregular wear.
Overinflation: reduces the
tread contact area with the road
surface, concentrating all of the
vehicle weight on the center of
the tread. This causes prema-
ture wear of the tire.
TREAD CONTACT
WITH ROAD
00137a
TREAD
CONTACT WITH ROAD
00138a
TREAD CONTACT
WITH ROAD
00139a