Caterpillar Performance Handbook, January 2017, SEBD0351-47

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Edition 47 32-1

32

CONTENTS

Selection, Application, Maintenance . . . . . . . . . . 32-1 Tire Construction . . . . . . . . . . . . . . . . . . . . . . . . . 32-2 Bias Ply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32-2 Radial Ply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32-3 Tire Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32-3 Tire Size Nomenclature . . . . . . . . . . . . . . . . . . . . . 32-3 Code Identification for Off-Highway Tires . . . . . . . . . . . . . . . . . . . . . . . 32-4 Manufacturers’ Designations: Firestone, Goodyear/Dunlop, Bridgestone, Michelin . . . . . . . . . . . . . . . . . . 32-5 Titan, Triangle, Eurotire, Yokohama . . . . . . . . 32-10 Radial Tire Identification: Michelin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32-13 Goodyear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32-14 Bridgestone . . . . . . . . . . . . . . . . . . . . . . . . . . . 32-15 Ton-Kilometer Per Hour Rating System . . . . . . 32-16 Tire Drive-Away Recommendations . . . . . . . . . . 32-17 TKPH Ratings: Goodyear Tires . . . . . . . . . . . . . . . . . . . . . . . . 32-18 Bridgestone Tires . . . . . . . . . . . . . . . . . . . . . . . 32-29 Michelin Tires . . . . . . . . . . . . . . . . . . . . . . . . . 32-37 Triangle Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 32-48 Eurotire Tires. . . . . . . . . . . . . . . . . . . . . . . . . . 32-50 ISO Load Index Speed Symbol: Michelin Tires . . . . . . . . . . . . . . . . . . . . . . . . . 32-45 Tire and Rim Association Ratings . . . . . . . . . . . 32-51 Tire Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32-51 Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32-53 Standard Cold Inflation Pressures . . . . . . . . . 32-54 Liquid Ballasting Table . . . . . . . . . . . . . . . . . . . . 32-77

SELECTION, APPLICATION, MAINTENANCE

Proper tire selection, application and maintenance

continue to be the most important factors in earthmoving

economics. Wheel tractors, loaders, scrapers, trucks, motor

graders, etc. are earthmoving equipment whose produc-

tivity and payload unit cost may depend more on tire per-

formance than any other factor.

Off-the-road tires must operate under a wide variety of

conditions ranging from dry “potato dirt” through wet

severe shot rock. Speed conditions vary from less than

1 mph average to 72 km/h (45 mph). Gradients may vary

from 75% favorable to 30% adverse. Climatic conditions,

operator skills, maintenance practices, etc. all may have

a profound effect on tire life and unit costs.

Although one specific tire construction may be accept-

able in a variety of applications, no one tire can meet all

requirements on any one machine and perhaps not even

one job. The many differences in tire requirements on

earthmoving machines have resulted in a wide variety of

tread and casing designs being made available. The opti-

mum tire selection for a specific machine on a given job

should be a joint decision between the user and tire sup-

plier. Several tire manufacturers have technical and appli-

cation representatives in the field for proper guidance in

tire selection.

When job conditions change, it may be desirable to

select a different tire configuration to meet the new

requirements.

TIRES