If the gear and sprocket assembly breaks the motor runs but the door won t move.
Garage door chain sprocket replacement.
Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door.
The process isn t as hard as you may think so consider the guide below.
This is a video on how to change the gear sprockets in a craftsman 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.
Step 1 turn off the power.
This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener.
This was a craftsman model 139 53976srt.