If you use the correct tools and follow our instructions, you can rebuild the entire torsion spring system in just a few hours, without any side trips to the ER. We won't cover how to replace garage door extension spring systems in this story. But we'll show you garage door spring replacement on the more common torsion springs, the kind that mount on a bar above the garage door. http://www.youtube.com/v/Z_eZc-kh40c&feature=share
Most residential garage doors have one of two types of springs: torsion or extension. Torsion springs are heavy-duty springs mounted to a metal rod that runs parallel to the door, directly above the door opening. These springs are loaded, or tensioned, with a twisting action. When the door closes, cables attached to the bottom corners of the door pull on pulleys attached to the ends of the metal rod the springs are mounted on. The pulleys turn the rod, which twists the springs and creates tension. When the door is opened, the springs unwind and help lift the door. https://www.youtube.com/attribution_link?a=Z_eZc-kh40c&u=watch?v=XXXXXX&feature=share
For example, low headroom garage doors often have cable drums on the outside of the end plate and the torsion springs usually wind down rather than up. They normally have left wind springs mounted on the left side of the spring anchor bracket and right wind springs mounted on the right side of the bracket. The first part on the shaft beyond each torsion spring is the end bearing plate. Just beyond the end bearing plate is the cable drum. On these the cable often runs on the front of the cable drum. The bottom of the cable is attached to a bracket that wraps around the front of and outside the vertical track.
2.3 Beware of older winding cones. These older Crawford and McKee torsion spring cones were made for 5/8" bars. Sometimes, however, the holes are too small for 5/8" bars. Whatever you do, don't use a 1/2" bar; instead, grind down a 5/8" bar to fit. I recently had a McKee spring let loose after winding because I used a 1/2" bar when my 5/8" bar wouldn't fit. Just before it let loose I was telling myself, "This is not safe." And it wasn't. The only safe way to replace these older springs is to make a winding bar for each hole of each cone.
Although garage door springs can break during any season and at any time, they most commonly break during the winter. This has to do with the temperature change. When the temperature sinks below a specific threshold, the metal will contract. This means it’s extremely possible for your door springs to shrink slightly during the winter months. This is hard on the springs and makes them more likely to break. https://youtu.be/Z_eZc-kh40c