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What are idler pulleys?

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An idler pulley is not only a tensioner it is also a guide pulley on long stretches of belts and chains that helps them from coming off the main pulleys it also helps with vibration

it is a free pulley that works as a tensioner on any belt bolted to hold or spring loaded


An idler pulley usually tensions a belt.. eg supercharger belt is kept taut by its respective idler pulley

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First answer by Pjay. Last edit by Chewd. Contributor trust: 15 [recommend contributor]. Question popularity: 21 [recommend question]

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