Correct spring size is determined by factors such as the weight and height of the door. You cannot substitute a different spring and just tighten or loosen the winding to make it balance the load. Why? To maintain cable tension under all operating conditions, the spring must retain about one turn of unspent wind-up at the top-of-travel position, which with the lift drum size and door height predetermines the number of turns of winding at the bottom-of-travel; and furthermore the torsion of the fully-wound spring at the bottom-of-travel must be slightly less than that needed to lift the weight of the door when translated by the lift drums.
Clearly there is a lot going on with your garage door and it takes trained and qualified experts to properly install, maintain, repair, and replace them. The experts and On Track Garage Door Services have the tools, skills, training to get your garage door fixed the first time. In addition we can help you fix your garage door affordably and offer many options from your basic garage door to custom wood styles. To find out how much your garage door repair will cost, give us a call at 480-641-2301 or use our Contact Page.
To estimate the maximum physical force required to wind these springs, consider that they are balancing the weight of the door with a torque applied to a lift drum on each end of the torsion shaft. The lift drums have a 2-inch radius, which is the standard residential size, and corresponds conveniently to about a 1-foot circumference. If we pessimistically assume the 10-by-7-foot door has a weight of 350 pounds, this implies a torque of 350 pounds on a 2-inch radius, that is, 700 inch-pounds, or 58 foot-pounds. Each of the two springs should be exerting slightly less than half of the balancing torque, or 29 foot-pounds. Compare this to, say, the bolts in an automobile, which are typically torqued to values of about 50 foot-pounds, or tire lug nuts, which may be torqued to well over 100 foot-pounds.
Here are the winding rods inserted in the winding cone of the unbroken old spring, posed just for a picture. Note that I have carefully placed a sturdy, steady ladder just clear of the swing of the rods, such that when I am standing on the lower rungs to reach the rods, that my head and body are clear of the "kill zone" around the spring and cone. You must have a trustworthy platform to stand on, because a slip or shake of the ladder while you are winding can cause you to lose your socketed attachment to the cone, letting loose the spring. I would not trust an ordinary household step ladder for this purpose.
Had a quick response to my call. thought I might have to wait a couple of days to coordinate their schedule and mine. To my surprise I received service in one and one half hours. Not only that but there was no sales call, technician Mike was fully prepared to give me a quote and complete the work as his vehicle carried everything needed. He very efficiently completed the work and cleaned up after I selected from the options. He replaced the springs all rollers and made needed adjustments expeditiously. I would recommend this firm to anyone needing garage door repairs.read more
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.