How To Stretch Garage Door Spring

This is the wire size.

How to stretch garage door spring. As you might expect longer springs tend to be used on taller garage doors. The spring works by either compressing the spindle or unravelling it to open and close the door. Change the fraction into a decimal and divide by 10. What could i use to stretch a side mounted garage door spring.

The cable then attaches to the hanging bracket at the end of the track. Hold the garage doorin this position by attaching a c clamp to the track at a point below the lowestdoor roller wheel. These will stretch and coil to aid the opening and closing of the door. This is true even if you have a garage door opener.

Repeat this process for the other spring. It has a 25 inch relaxed or compressed length and a 42 inch stretched length which is how far the spring should be stretched when the garage door is closed. It does not need to be tight just snug so it does not tangle. If you use an extension spring with a different first number you need to adjust your cable length to achieve the necessary 10 percent of stretch when your door is open.

With tension completely off extension springs disconnect springs from track support. To adjust your garage door s side mounted springs first open your door fully and secure it in place with a c clamp below the bottom roller. Disconnect power and lifting arm of garage door opener. Thread the cable through the guide hole and then through the spring.

For a more accurate measurement start at the 1 mark on your ruler. When you get this far you re almost done replacing garage door springs. If the garage door is being held up extension springs there should be two on each side of the door. Fasten c clamps or vice grips under bottom rollers to retain door.

Knowing the spring s length can help you find the wire size on the chart above. Once your garage door is secured remove the spring hook from the track hanger which will allow you to move the hook and adjust the spring s tension. This is accomplished by opening the garage door asfully as possible until it hits the stop bolt on thetrack. Remove c clamps or vice grips and lower door by hand.

This extension spring is used on a seven foot garage door. Measure 10 coils to the nearest 1 16.