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.

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. The most common cause of a chain being loose and appearing broken is a broken gear and sprocket. This gear set worked great and replaced a broken one in my 2002 1 2 hp chamberlain liftmaster yesterday.

This is the part that connects the motor to the chain or belt. One of the most common repairs on a liftmaster garage door opener is a broken gear sprocket. The gear and sprocket assembly is inside the cover of the garage door opener motor. Liftmaster and chamberlain garage door openers are very common for this.

If the gear and sprocket assembly breaks the motor runs but the door won t move. The bag said it was an oem piece. Chain drive garage door openers have a sprocket that is attached at the top of the motor. It was a perfect replacement and the garage door is working.

Chain driven garage door openers should have some slack in the chain for optimal performance. This was a craftsman model 139 53976srt. Your garage door opener has a gear and sprocket that will eventually fail. This is a video on how to change the gear sprockets in a craftsman garage door opener.

You can put the chain back on your automatic garage door opener using a simple adjustment mechanism. This can be easily replaced by a garage door service technician.