Adjustment to torsion springs can be dangerous because they must be adjusted with the door down and the spring under tension.
How to balance a garage door with a torsion spring.
With an extension spring door the goal is to take all the tension off the door before you even think about touching a spring you can do this by opening the door all the way and propping it up with a ladder.
Pull down on the emergency release handle to disconnect the door from the opener track.
Stand a stepladder at the area of the motor and unplug the power cord to the opener.
Once the spring is free of tension remove from its track hanger.
Look at the wall just above the garage door.
Retest the door balance as you did in step 1.
Be sure to have all your tools inside before closing the door unless you have an alternate access door to the garage.
Garage door springs offset the weight of the door and allow it to open and close with ease.
Numerous websites and videos showing you how to change them yourself using galvanized or oil soaked some will count the number of coils within a certain measurement to determine the wire diameter of the torsion spring some will use a spring gauge to determine the wire diameter of the torsion spring.
Locate the torsion springs on the bar above the garage door.
Spot the bar that runs parallel to the top of the garage door and has 2 springs on it.
If it was opening too quickly move it to the next lower hole.
Torsion springs must be adjusted with the door in the down position.
If the door was closing too quickly move the spring to the next higher hole on the bracket.
The bar also has a pulley at each end through which the garage door cables that open and close it pass.
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.
Close the garage door.
Adjusting an extension spring door.
A problem with the spring tension could cause the door to open or close unevenly improperly or at the wrong speed and adjusting the springs will likely solve the problem.