If they have a lot of give you may want to consider replacing them.
How to level a garage door with springs.
Second and far more critical is when the garage floor has begun to tilt backward toward the house.
Once the spring is free of tension remove from its track hanger.
So with a gap on the left side you will begin leveling on the right side.
This will tighten the screws and raise the door.
Remove any safety cables from the springs before loosening the springs themselves.
If the door was closing too quickly move the spring to the next higher hole on the bracket.
If the garage door is level tighten the set screws 3 4 turn past the point at which they meet the hollow shaft.
Garage door springs offset the weight of the door and allow it to open and close with ease.
Move to the other side of the garage door where the gap is.
Remember to release the vise grip each time you get to step nine.
If it was opening too quickly move it to the next lower hole.
Garage doors come in different styles that use two different types of springs.
However an out of kilter garage floor may require leveling when two critical scenarios happen.
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.
If the gap is less than an inch make the marks one eighth of an inch apart.
To rise the side of the door that is lower turn the set screws in the drum clockwise.
Climb up to the drum and use a marker to make one mark on the drum and another approximately one fourth of an inch above the mark on the drum if the gap under the door is 1 inch or more.
First the floor may be so out of level that the garage floor does not meet the bottom edge of the door.
Garage springs are under an extreme amount of tension and either stretch or torque providing enough force to help you move the door.
Adjust the springs on both sides of the door the same way.
If the bottom of the garage door is still not level repeat this process following steps six through nine with another mark or marks until the door is level.