Replacing garage door springs, also known as torsion springs, can be a difficult and sometimes dangerous job. The springs can be found mounted on a steel length that covers the width of the garage door, and fitting the springs onto them can cause some trouble, as they need to be wound very tightly before they are safe to use. If you are a keen DIY fan, and think that fitting new garage door springs should be within your skill range, then following a few simple steps can help you to get the job done quickly and safely.
Step 1 - Getting Ready
Before you attempt to replace your garage door springs, you should lock the garage door in the 'down' position by using the locking pliers, or by locking the door into the ground. This is to ensure that the door doesn't start to lift up when you are removing or fitting the springs, as you can become seriously injured it this occurs. With the door locked, unplug the garage door opener.
Step 2 - Removing the Old Spring
Fit on your safety goggles, and ensure that your step ladder is secure, or that there is someone holding it steady. Place the ladder under the winding cone of your spring, and place your winding bar into the cone's hole. Push the bar in so that it is inserted fully, and then press the bar towards the roof while winding the spring. Hold your cone at pressure with the winding bar, and then use another to remove the screws of the cone. Gradually undo both screws until you can move the spring. Using both winding bars, slowly unwind the spring using quarter-turn intervals. Once this is done, remove the old garage door spring from the bearing plate, and then remove the bolds which hold the springs to the center of the door. Ensure that all screws are loose. Put your ladder under the red cable drum, then remove the screws. Move the ladder to the black cable drum and repeat.
Step 3 - Refitting the Cables and Drums
Take note of the position of the torsion springs and cable drums. Insert the new garage door spring, and replace the cable drums, red drum to red spring (left side) black drum to black spring (right side). Tighten the screws so that they won't move while you put the tube back into place. Tighten the red cable drum and lock it into place. Repeat with the other drum. Screw down the screws, and ensure that the cables are equally tight.
Step 4 - Tightening the New Spring
With all of this in place, use your winding bars to tighten the screws around the spring. Use alternate turns of each winding bar until you have achieved around 7 and a half full turns of the spring. Once you have this tension, lock both screws. Remove locking pliers, or unlock the garage door, and lift up. If it moves up on its own, you will need to ease the spring one quarter turn, in order to ensure good tension.