In this case the cable can be replaced fixing the problem.
How to fix a garage door opener chain.
Sometimes the cable will break if it is a combination chain and cable drive system.
How to fix a chain drive garage door when it won t open.
Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door.
Garage door opener is very strong and seldom does the chain actually break.
Chain drive garage door openers have a sprocket that is attached at the top of the motor.
A garage door opener chain may make a lot of noise when you pull it to open your door but it is one of the most reliable types of door openers ever invented.
For many generations people rely on this type of door opener not only because it is easy to use but also because it is cheap and can easily be repaired when broken.
Chain driven garage door openers should have some slack in the chain for optimal performance.
In order to fix this you ll want to make small changes to the close limit setting until the door opener knows to stop once the door has reached the floor.
The main drive gear is the plastic gear that comes in direct contact with the worm drive gear on 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.
If your garage door is closing fully and then reversing to open again then it may be due to a problem with the close limit switch.
Having an automatic door opener in your garage is a great convenience but you have to give the opener and all its parts regular.