To keep the door from falling it must be clamped to hold it in place.
How to level garage door with extension springs.
To be able to adjust the springs the door must be in a position that release the tension on the springs.
For extension springs this is in the up position.
If both springs are the same length the garage door should be level across the floor.
You can do this by opening the door all the way and propping it up with a ladder.
Adjust the springs on both sides of the door the same way.
With an extension spring door the goal is to take all the tension off the door before you even think about touching a spring.
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.
Open it just as wide as you can without hitting the garage door opener s stop bolt and place a clamp on the track on both sides to keep the door in place.
Raise the door and release the garage door opener.
8 doors require a 27 spring that stretches up to 48 75 total length when to door is closed extension springs are a non returnable item call customer service if you have any questions.
Be sure the door is open and supported when doing this.
Retest the door balance as you did in step 1.
If the door was closing too quickly move the spring to the next higher hole on the bracket.
Once the spring is free of tension remove from its track hanger.
If the extension springs are not the same length open the garage door and change the location of one of the s hooks so that when you close the door both springs are the same length.
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.