Garage Door Opener Sprocket Broke Off

Sprocket is at the end of the opener rail closest to the garage door opening.

Garage door opener sprocket broke off.

This was a craftsman model 139 53976srt. This is a video on how to change the gear sprockets in a craftsman garage door opener. This gives the appearance of a broken chain or belt. One of the most common repairs on a liftmaster garage door opener is a broken gear sprocket.

This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener. Over time though this slack can increase or the gear and sprocket assembly can wear and the chain may pop off the sprockets. If you are not confident in your ability to diagnose the problem call a local garage door service company. Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door.

The chain wraps around this sprocket as well as the gear and sprocket at the motor. Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door. If the gear and sprocket assembly breaks the motor runs but the door won t move. This is the part that connects the motor to the chain or belt.

Chain driven garage door openers should have some slack in the chain for optimal performance. Eventually this will cause the sprocket to snap off. You can put the chain back on your automatic garage door opener using a simple adjustment mechanism.