The herky jerky motion is especially common with garage doors equipped with extension springs.
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.
A garage door should not be opened until the spring is repaired.
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.
Important things needed to open a garage entry with broken spring.
A garage door with a broken spring should not be opened or closed using an automatic operator.
All though some openers can lift the door you risk damage to the operator and the door.
If your garage door goes up and down in a jerky motion you might have one broken spring on a two spring system.
The garage door may be using a one spring system or a two spring system.
A garage door that has a broken spring has nothing to support its weight.