This gear kit on amazon.
Garage door chain sprocket replacement.
If yours is a belt drive you need a kit like this https amzn to 2zqns.
Amazon s choice for craftsman garage door sprocket replacement for liftmaster 41c4220a gear and sprocket kit fits chamberlain sears craftsman 1 3 and 1 2 hp chain drive models 4 8 out of 5 stars 1 216.
Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door.
This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener.
If the gear and sprocket assembly breaks the motor runs but the door won t move.
The process isn t as hard as you may think so consider the guide below.
Chain drive garage door openers have a sprocket that is attached at the top of the motor.
Step 1 turn off the power.
If you replace the sprocket assembly in your chain drive garage door opener yourself you may be able to save a lot of money.
This was a craftsman model 139 53976srt.