📖 GLOSSARY · PART
What is an idler pulley?
A spring-loaded wheel that keeps tension on the drum belt; a worn one squeals and lets the belt slip.
The idler pulley rides against the drive belt and a spring pulls it to keep the belt tight. As the bearing dries out it starts to squeal — a noise that rises and falls with drum speed, which is how you tell it apart from a blower or motor noise that stays constant. A failing idler also lets the belt slip and glaze, so replacing the belt without the idler usually means doing the job twice.
Where you’ll meet it
Repairs that involve idler pulley
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