Garage door chains become slack from everyday use because of the vibrations created by the motor and the weight of the door.
Garage door chain loose when closed.
You may find that a loose garage door opener chain has less power to open and close your garage door or you may find that it is just hitting the door as it moves it and creating an annoying sound.
2 brace the open door.
Tightening up the chain is therefore an important part of regular maintenance.
A loose chain isn t just noisy it also forces your opener to do more work making the whole system less efficient.
Move the garage door up and down until you find a place where the door stays suspended when you let go.
If that point is more than four feet or less than three feet above the ground you will need to balance the door.