Garage doors can weigh hundreds of pounds, and the average individual needs help to manually operate one. That help is supplied by torsion or extension springs. If the door is correctly balanced and level and also the runners nicely lubricated, closing and opening the doorway should require little effort.
Garage doors implement one of two types of spring systems. Torsion springs are mounted horizontally over the doorway, and wires attached the bottom corners of the doorway end the spring when the door is closed. When you open the door, then the spring unwinds and pulls the door up. Extension spring processes are alike, except the springs, which can be attached to the bottom corners of the doorway, store energy by extending as opposed to winding.
A garage door can be next to impossible to start manually when the spring breaks, and loose or bent monitors can also make opening the door hard. The door will even stick if it becomes misaligned like this one side hits the ground Cape Coral before the other. Realigning a doorway and fixing the monitors are DIY jobs, but issues with the springs must be dealt with by experts. The springs store large quantities of energy and can lead to injury if they suddenly unwind.