Test the door balance. A garage door should require only a few pounds of pressure to move it up and down. If springs wear out and lose their resiliency, a power garage door opener may need to work extra hard to lift the door. This can quickly wear out the motor on the opener. Replacing worn-out springs is usually a job for a professional technician.

When one or both springs break, gravity takes over and you feel the full weight of the door when lifting or lowering it.  It may be possible to pull the door up by hand, although doing so will likely be very difficult. In most cases, two or more people are needed to raise the door high enough for you to drive your car out of the garage. While single garage doors can typically be lifted, double doors are nearly impossible to manipulate due to their excessive weight.
6.13 Lower the second bar to the top of the garage door as you did the first bar. If your shaft is distorted inside the cone, you may need to tap the bar with a hammer as you unwind the spring. Maintain a firm grip on the bar; keep it firmly inserted completely into the cone; and be prepared at all times for the cone to slip, break, explode or snap loose from the shaft and jolt the bar down.
An extension spring counterbalance system consists of a pair of stretched springs running parallel to the horizontal tracks. The springs lift the door through a system of pulleys and counterbalance cables running from the bottom corner brackets through the pulleys. When the door is raised, the springs contract, thus lifting the door as the tension is released. Typically these springs are made of 11 gauge galvanized steel, and the lengths of these springs are based on the height of the garage door in question. Their lifting weight capacity can best be identified by the color that is painted on the ends of the springs.
Garage doors cause injury and property damage (including expensive damage to the door itself) in several different ways. The most common causes of injury from garage door systems include falling doors, pinch points, improperly adjusted opener force settings and safety eyes, attempts at do-it-yourself repair without the proper knowledge or tools, and uncontrolled release of spring tension (on extension spring systems).
Lower the door and dismantle it by removing the hardware. Lower a double door by recruiting at least two helpers to help with the weight, and place a 2×4 block under the door to prevent smashing a foot or finger when it’s lowered. Remove the sections one at a time by disconnecting the rollers and brackets. If you have windows, tape them to help control flying shards if they break. Then remove the old roller tracks and remaining hardware.

Extension springs last 15,000 cycles. Every time the door goes up and down is one cycle. On average extension springs will last 7 to 12 years. For most people, you know you need to replace your extension springs because it snaps. Sometimes, however, when extension springs get older, they can lose their tension and the spring becomes elongated. This is rare but it does still happen. Basically, the coils are fatigued and when the door is up you can see gaps where the spring is not relaxing properly. When this happens, the spring is useless. It is best to replace the springs at this point rather than overworking the opener which will cause it to last a shorter life.
If your garage door goes up and down in a jerky motion, you might have one broken spring on a two spring system. Some garage door openers are strong enough to lift a door with only one good spring. The “herky jerky” motion is especially common with garage doors equipped with extension springs. It might be something as simple as lubricating your garage door pulleys, hinges, and rollers. When in doubt or if something doesn’t feel right about your door, call a service company to have it serviced. 

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If you have a single-car garage, an extension spring will do the job. If you’re looking for a smoother motion and an ability to lift heavier doors, you may be better off selecting the torsion spring option. And if you have a two-car garage, your door will likely be too heavy for an extension spring. In this case, the torsion spring is the better choice.
Torsion springs are located above the opening of your door with springs that slide onto a bar. Extension spring systems can be found alongside the opening of the door. It's important to know whether or not a garage door company provides service for your needs. Precision's professionally trained technicians are fully equipped to work on torsion and extension spring systems. http://m.youtube.com/e/Z_eZc-kh40c
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