Disengage the broken extension spring one end at a time.
How to change a garage door extension spring.
At the far end of the door rail remove the spring end from its mounting pin.
The new spring s diameter length and wire size or gauge must be the same as your old spring.
Open the garage door to remove all spring tension and clamp it in place.
Place scale under the garage door on the side of the door with the broken extension spring.
Detach the cable and thread it around the pulley to free the spring.
If both springs are old you should replace them both at the same time.
You may need to use a 2x4 or some other object to pry the garage door open.
Once in place disconnect the.
Do not use a digital scale as they often will not respond to the door weight changing as rollers no longer stick to the track.
The following steps will walk you through how to replace an extension garage door spring.