Garage Door Opener Sprocket Broke Off

One of the most common repairs on a liftmaster garage door opener is a broken gear sprocket.

Garage door opener sprocket broke off.

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 gives the appearance of a broken chain or belt. The chain wraps around this sprocket as well as the gear and sprocket at the motor.

This is the part that connects the motor to the chain or belt. Over time though this slack can increase or the gear and sprocket assembly can wear and the chain may pop off the sprockets. This is a video on how to change the gear sprockets in a craftsman garage door opener. A new front sprocket costs about 150 200 include the labor to install it.

This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener. Chain driven garage door openers should have some slack in the chain for optimal performance. 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.

Chain drive garage door openers have a sprocket that is attached at the top of the motor. This was a craftsman model 139 53976srt. Eventually this will cause the sprocket to snap off.