Garage Door Sprocket Broke Off

Eventually this will cause the sprocket to snap off.

Garage door sprocket broke off.

We carry many other garage door sprockets several for various brands and models of garage door opener sprockets. This was a craftsman model 139 53976srt. It was a perfect replacement and the garage door is working. Sprocket is at the end of the opener rail closest to the garage door opening.

This sprocket is typically used on a soled keyed garage door shaft. You can put the chain back on your automatic garage door opener using a simple adjustment mechanism. The chain wraps around this sprocket as well as the gear and sprocket at the motor. This gear set worked great and replaced a broken one in my 2002 1 2 hp chamberlain liftmaster yesterday.

Over time though this slack can increase or the gear and sprocket assembly can wear and the chain may pop off the sprockets. A new front sprocket costs about 150 200 include the labor to install it. Garage opener sprocket broke off i already had problems as the door would move a little trying to close then back open. If the gear and sprocket assembly breaks the motor runs but the door won t move.

Sometimes it was taking several tries sometimes it was going fine the first time. Can be used on tube shafts. One of the most common repairs on a liftmaster garage door opener is a broken gear sprocket. 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.

Chain drive garage door openers have a sprocket that is attached at the top of the motor. This is a video on how to change the gear sprockets in a craftsman garage door opener. 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.

2 od x 3 4 stand off. This gives the appearance of a broken chain or belt. This is the part that connects the motor to the chain or belt. Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door.

Chain driven garage door openers should have some slack in the chain for optimal performance.