Garage Door Chain Sprocket Broke

After several years the garage door springs become weaker causing more stress on this particular part causing it to fail and wear out.

Garage door chain sprocket broke.

If the gear and sprocket assembly breaks the motor runs but the door won t move. Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door. One of the most common repairs on a liftmaster garage door opener is a broken gear sprocket. Liftmaster and chamberlain garage door openers are very common for this.

You can put the chain back on your automatic garage door opener using a simple adjustment mechanism. Your garage door opener has a gear and sprocket that will eventually fail. The gear and sprocket assembly is inside the cover of the garage door opener motor. The most common cause of a chain being loose and appearing broken is a broken gear and sprocket.

This is the part that connects the motor to the chain or belt. Located at the top of the motor unit the gear and sprocket assembly drives the chain that opens and closes the garage door. 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.

This can be easily replaced by a garage door service technician. Chain drive garage door openers have a sprocket that is attached at the top of the motor. This was a craftsman model 139 53976srt. It wasn t listed for the same model but after looking online it seems that most garage door openers made after 1984 use the same sprocket assembly.

It was a perfect replacement and the garage door is working. The bag said it was an oem piece.