Door styles - in addition to the styles just mentioned, it is important to also consider additional features such as windows across the top of the door to provide light inside of the garage, the use of steel or wood frames to give decorative doors added security and stability, and insulation which can reduce energy costs in the attached garage by an impressive 15 to 20%; and
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The winding and unwinding is done at a metal fitting, called a winding cone, attached to the outside end of the spring. You stick a winding bar into one of the four holes in the cone and use the bar as a lever to turn the cone. Once you've completed a quarter turn, insert the other bar into a different hole in the cone and let the bar lever against the closed garage door to hold the spring tension. This allows you to move the original bar to repeat the process, alternating the bars with each quarter-turn. It takes about 30 quarter-turns to fully tension a standard torsion spring. https://youtube.com/e/Z_eZc-kh40c
There are many steps to replacing torsion springs, but overall it's a simple, straightforward process. If you're inclined to attempt it, find a good online video tutorial (preferably done by a garage door pro) that walks you through the entire process, including how to buy the right size of springs. You can also buy new springs and any related parts online, along with the most important items that you need: the two solid-metal winding rods that you use to wind and unwind the torsion springs.
When cleaning the photo eye, you should take care not to scratch or damage the eye since it’s made of glass, similar to that of a camera lens. The photo eye itself is pretty small, only a few centimeters in diameter, but it can get dirty rather easily. To clean it, you’ll need a soft cloth and a mild, streak-free cleaner. Gently wipe away any dirt or residue that has built up on the eye and be careful not to oversaturate as excessive wetness can cause dirt to stick to the eye more quickly.
If your garage door is equipped with only one torsion spring, it will be much harder to get your door open. You will need to get 2-3 people to help lift the door up because the full weight can be anywhere from 150 to 300 pounds. We don’t recommend lifting the door when the spring break's due to the danger of it falling on someone. If you absolutely must get your garage door open, raw strength is what you need. When you get the door in the up position, use vise-grips or a c-clamp on the track below the bottom roller to hold the door in the up position.
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Safe automatic door openers. All automatic openers must now have an auto-reversing mechanism and photoelectric eyes located near the floor on both sides of the door (see photo). If the door is closing and the beam between the eyes is interrupted, the door will automatically reverse. If the eyes aren’t connected, the door won’t operate. For instructions on how to install a new garage door opener, see How to Install a Garage Door Opener.
With over 300 independently moving parts, your garage door is a deceptively complex piece of equipment. To help prevent malfunctions and break-downs, it is a good idea to occasionally perform a garage door tune-up to keep all of these parts in good working order. A regular tune-up service by a Sears professional can prevent unexpected door problems and prolong the life of your existing equipment. http://m.youtu.be/Z_eZc-kh40c