Functioning of the garage doorpretty much depends on the springing system. Springs are fixed to the upper side of the door connected with some wires. Garage doors mainly cover the main window or the entrance of the house which is quite big; naturally making the garage door also big in size. They are quite heavy due to the material used but the garage doorspring mechanism used in them makes the door very light and easy to use. Garage door spring makes pulling up lighter and while rolling down, the door does not touch the ground making a big bang noise or hurting the person especially when we have kids or elder persons operating them.
Spring's life is expected to be ten thousand cycles. Made to order garage door spring are also made in order to increase their life. Springs are made of hardened steels; can be plain, rolled, painted, oiled or galvanized.
Continuous usage of garagedoor can make the spring old, reducing the lubricant in it which may result in breaking of it and can cause sudden accidents. Therefore regular garage door repair and maintenance is a must.
If you even don't use the garage door for long time then too spring can go rusty and loose oil in them. In that case before using the garage door we need to check the spring mechanism with a professional help; as you may not be able to find out the exact faulty point in it.
We calculate spring's life to be 7 years (normally 2 cycles a day, up and down expected 2500 days i.e. 7 years). After that a spring may need a maintenance check; not by yourself but with a help of a skilled person.They are experienced and specially trained to find out faults. You may not have the right tools like safety goggles, hard gloves.You may not be able judge if both the sides of the spring are to be replaced or one is in a good condition. If the garage door is fixed by a professional company; at times we can't get those same parts used by them. Companies usually have specific suppliers for their parts.
A professional company will always provide you the right men with right tools and of course they will provide you with some kind of warranty, which in turn will be of great use when the garage door breaks in earlier. They can repair it free of cost if you are under warranty. Look into your phonebook or your nearby friends to find out a technician in your area.