Chain drive garage door openers have a sprocket that is attached at the top of the motor.
Garage door chain sprocket replacement.
If the gear and sprocket assembly breaks the motor runs but the door won t move.
If you replace the sprocket assembly in your chain drive garage door opener yourself you may be able to save a lot of money.
If yours is a belt drive you need a kit like this https amzn to 2zqns.
This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener.
This is a video on how to change the gear sprockets in a craftsman garage door opener.
Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door.
This was a craftsman model 139 53976srt.
This gear kit on amazon.
Https amzn to 2uwvnkj i m working on a chain drive opener.
Step 1 turn off the power.