Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door.
Plastic gear for sears garage door opener.
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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 the gear and sprocket assembly breaks the motor runs but the door won t move.
Https amzn to 2uwvnkj i m working on a chain drive opener.
If yours is a belt drive you need a kit like this https amzn to 2zqns.