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Garage door opener sprocket broke off.
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If the piece of metal that broke off is the piece where the j bar that connects your garage door opener to the door then you can repair this by installing a new operator bracket.
Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door.
You can put the chain back on your automatic garage door opener using a simple adjustment mechanism.
If you are not confident in your ability to diagnose the problem call a local garage door service company.
A new front sprocket costs about 150 200 include the labor to install it.
Operator brackets come in different styles some are.
First we will address fixing the broken piece of metal.
Manufacturer and model number of your garage door.
Chain drive garage door openers have a sprocket that is attached at the top of the motor.
Over time though this slack can increase or the gear and sprocket assembly can wear and the chain may pop off the sprockets.