It can be extremely difficult or even dangerous to change a broken torsion spring, so if you’re not confident in your ability, get a professional to do it for you. When you buy a replacement torsion spring, find one that is the correct type and size for your garage door to avoid complications. You can check with a manufacturer or with a garage door company if you want to see their products and know more about spring wire, helical springs, coiling springs, custom spring options, etc. If you don’t want to use up to $600 on hiring professional help, you can replace the spring yourself. There are no complicated equations, calculations or formulae, but you will need strength and concentration. This is what you need to do:
- Lock the garage door in the down position and disconnect your garage door opener. Torsion springs are under extreme tension when the garage door is down, so before you loosen it, wear safety glasses and make sure that the ladder you’re going to use is stable.
- Two-car garages have two springs in the door, and before you change the faulty one, you also have to unwind the other spring that isn’t broken. Place your ladder under the winding cone of the fine torsion spring to loosen the winding cone. The winding cones are mounted to a bracket on the end of the springs pointing away from the center of the door.
- Insert a winding bar—this is a steel bar 18 inches long—inside the cone hole and press it up until you feel the tension of the spring. Keep applying some pressure while rotating the cone. If it stops turning, loosen the screws on the cone up to the point when you can unwind the spring. When the cone is loose, insert a second bar once the first has been rotated downward and keep rotating until the spring is unwound.
- Remove the bolts holding the stationary cones on the opposite side of the winding cones. This will enable you to slide the springs to the sides of the door. Take off the screws on the cable drums and loosen them from the bearing plate so you can slide the pole holding the springs.
- Push the pole towards the opposite side of the spring you want to replace until the pole goes past the bracket holding it and the pole is loose on the side of the broken spring. Remove the drum, lift out the old spring and install the replacement, then reattach the drums. Make sure that the screws on the drums are tight before putting on the cables. Tighten the cable by tightening the pole.
- Attach the springs to the center cone. Use the bars to wind the springs in the opposite direction. Reattach the bolts. Tighten the spring to a count of thirty quarter turns, then put one bar in the bottom slot of the cone and rotate it slightly away from the door. Set the cone by hitting the bar with the other bar while pulling the bar inside the cone towards the center of the door. Once in place, slide the bar out from the door until it is horizontal to the floor and tighten the screws.
- Oil the springs and you’re done.