There are only a few ways that the chain can be tightened.
Tighten garage door chain.
Slowly turn the outer nut as you watch the slack on the chain above your chalk mark.
Using your wrench you can start to loosen up the adjusting nut on the side of your carriage closest to the opener head.
A sagging chain is a result of normal usage of the garage door opener.
The trolley is responsible for pushing or pulling the opener arm along the chain so as to open and close the garage door.
Chain adjusts by shortening the chain itself.
Twist the outer nut clockwise with the wrench to move the trolley and tighten the chain.
Tightening your garage door chain is a simple matter of turning the right nut.
Turn it counterclockwise holding the other nut in your hand to prevent it from turning.
There may be an adjustment linked to the chain or an adjustment to the length of the door opener track.
Watch this video and see the professional at town country door llc demonstrates the.
Continue to turn the.