Step 1 turn off the power.
Garage door chain sprocket replacement.
Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door.
This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener.
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.
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.
This was a craftsman model 139 53976srt.
If yours is a belt drive you need a kit like this https amzn to 2zqns.
This is a video on how to change the gear sprockets in a craftsman garage door opener.
Https amzn to 2uwvnkj i m working on a chain drive opener.