The major, and the most damaging component of the overhead door is that the garage door spring up - (or springs depending on the design), which supports the entire burden of the door panels (occasionally over 400 pounds) and helps you to lift / lower your whole door assembly.
I've personally installed 3 overhead garage doors using two distinct types of springs, and you do have to trust me on that - garage door springs are under enormous pressure and you can get seriously injured or murdered when doing such work. If you Choose to take your opportunities -
It is imperative that you follow instructions to the last detail! Even in the event that you've got a friend or an expert doing this to you, read it and check all after the installer completes the job. The garage door doorways don't have any safety brakes (at least that I haven't heard about any), which would prevent it from falling down when the supporting spring neglects. I have found some US patents for such apparatus, but apparently none of these were ever implemented into a real garage door.
You may also have an older, 1 part door that dries out as it goes up and overhead. This particular design will possess springs mounted on either sides of the door opening - in about your waist height, fastened to a lever bracket system which extends the springs toward the ceiling in the door closure. It's a classic and extremely dangerous system, not manufactured anymore. If you've got such a system in the garage, then I would highly recommend replacing it.
Garage door torsion springs - out you will find either single or double spring layouts. The spring will normally break while below the most stress that's as soon as the overhead garage door shuts / journeys down, or it's already completely shut. If you are closing it manually and it happens during this surgery, do not attempt to prevent it from beating down, then let it move ... well, unless the foot is where the door will hit!
Garage door extension springs - you may have either one or two on each side of your overhead garage door A crucial issue with those springs would be to have a security cable installed inside of every single spring and fastened properly, so when the door opens and shuts, the spring can freely slide onto this cable! When the garage door spring snaps without the cable inside, broken ends might severely injure anyone standing within their range.
The cables must be always included with all the overhead garage door components (supposing that they came armed with extension springs), but a great deal of people either neglect to put in them, or don't read directions and maybe assume that they are not required.
Unlike the torsion spring, that doesn't really demonstrate any visual wear till it breaks, extension spring wear is far less difficult to place, since they just change dimensions: that the coils are over-stretched (best observable once the garage door is still open). If you discover such a behavior on your own garage door springs - it is time to get a replacement.
And for both types of their garage door springs - the tension ought to be equally adjusted (on a 2 spring program) therefore that the overhead door travels in its tracks - to - test it, halt the door slightly above the garage flooring (1" or two) and also make sure that its bottom / top border are perfectly horizontal. Measuring the gap across the bottom may not be the ideal approach to confirm that, because the garage floors are usually out of level.
Placing a flat somewhere in the center section of the garage door high edge would give you the very best readout (recall that the door shouldn't be closed entirely!) . When the springs are properly corrected, you should be able to raise and block the garage door in any given height, and it ought to stay at this level with no help ( garage door opener arm disconnected).