TIRES

TRACKS & RIDING RINGS INFORMATION

The tire provides a reinforced surface for the drum to roll on the trunnions. Without the tire, the whole shell would have to be much thicker to withstand this pressure.

The longest-lasting tires with least amount of maintenance necessary are rigid, round and aligned. A rigid tire will eliminate flexing and the problems caused by cyclic loading. A round tire is the first step in achieving a round drum. An aligned drum will improve the life of the trunnion wheel and tire surfaces. Tires are typically AISI 4140 alloy steel–quenched & tempered.

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SYMPTOMS OF DRUM TIRE ISSUES INCLUDE:

Tire walking, either around the drum or horizontally
Tire shims falling out
Riding on one bumper wheel constantly
Tire-surface imperfections
Daylight between wheel and tire
Washboarding, grooving, rough spots, flaking, contact issues
Tire or shell cracking
Excessive creep/gap

If drum tire symptoms are present on your dryer, immediate actions include replacing or redesigning the tire shims. Proactive action includes testing your drum for walking (see sidebar). Make your drum rigid, round and aligned. This includes shimming the tire such that it no longer walks, which likely involves a redesign of the shims. If they are falling out, then the drum and trunnions should be realigned and resurfaced.

Typically, AISI 4140 alloy steel–quenched & tempered

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