Shredded plastic gears are a common problem with chain driven garage door openers.
How to replace garage door opener gears.
This gear kit on amazon.
Step 1 unplug opener.
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.
Fortunately the repair is neither difficult nor expensive and it should only take an hour of your time.
Replacing a garage door opener gear is not a difficult project but does require some care and attention to detail this gear is situated between the belt and the motor drive.
So if you suddenly find that the motor on your garage door opener sounds like it s running but the door is not moving checking for worn gears is the first thing you should do.
The worm gear attaches to the motor shaf.
This video from sears partsdirect shows how to replace the drive and worm gears on a chain drive garage door opener.
Before doing any work on the garage door opener you must unplug the opener to guard against the possibility of an accident.
If yours is a belt drive you need a kit like this https amzn to 2zqns.