The garage door may be using a one spring system or a two spring system.
Manual two spring garage door broken.
The size of the door and the type of spring system determines how difficult opening the door will be.
If your garage door goes up and down in a jerky motion you might have one broken spring on a two spring system.
If the roller will not be supported by a stopper it would only shut back since the spring is broken and can no longer support the door s heavy weight.
Two ladders 6 foot or higher these two ladders serve as stoppers when the roller is fully opened.
The herky jerky motion is especially common with garage doors equipped with extension springs.
A garage door should not be opened until the spring is repaired.
A garage door that has a broken spring has nothing to support its weight.
All though some openers can lift the door you risk damage to the operator and the door.
Important things needed to open a garage entry with broken spring.