Https amzn to 2uwvnkj i m working on a chain drive opener.
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Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door.
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This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener.
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If yours is a belt drive you need a kit like this https amzn to 2zqns.
Liftmaster 41a5585 replacement gear sprocket assembly kit garage door openers 34 95 liftmaster 41a5668 gear sprocket assembly for ats211x ats2113x garage opener.
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If the gear and sprocket assembly breaks the motor runs but the door won t move.