MAINTENANCE
6-44 / Wheels and Tires
© 2018 Pierce Manufacturing Inc. All Rights Reserved.
Under inflation can also result in general deterioration of the tire body, including separation of the tread from the
body or fatigue breaks in the body cords. If one tire on a dual assembly is severely under inflated, the other one is
prone to failure from overloading.
Over inflation detracts from a tire's ability to endure road shocks. The tire is more rigid, resulting in carcass and bead
failures. Overinflated tires often exhibit groove cracking and rapid center tread wear, and are more likely to be cut
or punctured.
Excessive pressure buildup resulting from overloading or high speed can cause the rim to fail. The load-carrying
capacity of a tire cannot be increased over the maximum rated load by increasing the inflation pressure.
A tire that has become hot from normal use will have a higher pressure than it will when cool. Never bleed pressure
from a hot tire that has increased pressure as a result of the normal pressure buildup. Always check tire pressure
when the tire is cold.
6-27.5 Matching
Match dual tires so that tires worn to the same diameter are placed together. Do not mount tires together that vary
by more than 1/4 inch in diameter or 3/4 inch in circumference.
Match dual tires on tandem axles as directed above, but do not place the four largest tires on one axle as this may
cause high axle oil temperatures and reduced axle life.
For 4x4 chassis, match front drive tires to the rear axle tires so that the rolling radius does not create a ratio
difference between front and rear axles.
6-27.6 Tire Wear Inspection
Inspect tires for signs of abnormal or excessive wear. Sufficient tread depth is essential to proper handling and
braking performance. Refer to the tire manufacturer’s owner’s manual for minimum tread depth requirements.
Replace tires before minimum tread depth is reached.
Tire tread life is dependent on many factors including the following:
•
Tire load
•
Proper inflation pressure
•
Tire footprint (area of rubber in contact with the road)
•
Frequency of dry-steer maneuvers (steering the vehicle in the absence of forward motion)
•
Tandem scrub (inherent to all non-steering tandem suspensions)
•
Engine horsepower
•
Brake power
•
Frequency of tight cornering maneuvers
•
Driving habits of acceleration and braking
•
Suspension alignment
Expect faster tread wear on fire apparatus when compared to standard line-haul trucks. Fire apparatus accelerate
faster, brake harder, corner tighter, and have more horsepower flowing through the tires to the road than other
heavy-duty trucks with the possible exception of waste haulers. Tandem axle aerial apparatus are particularly
susceptible to accelerated tire wear due to the combination of the tandem scrub phenomenon and high suspension
Never operate a vehicle without sufficient tire tread depth, or loss of vehicle control, property damage,
personal injury, or death may result.
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Страница 18: ...FOREWORD 1 6 To the Owner and Operator 2018 Pierce Manufacturing Inc All Rights Reserved ...
Страница 30: ...SAFETY 2 12 Safety and Responsibility 2018 Pierce Manufacturing Inc All Rights Reserved ...
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Страница 122: ...OPERATION 5 60 Driving the Vehicle 2018 Pierce Manufacturing Inc All Rights Reserved ...
Страница 180: ...LUBRICATION AND MAINTENANCE INTERVALS 7 8 Scheduled Inspections 2018 Pierce Manufacturing Inc All Rights Reserved ...
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