This will tighten the screws and raise the door.
How to level a garage door with springs.
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.
If the garage door is level tighten the set screws 3 4 turn past the point at which they meet the hollow shaft.
Start with the side which is opposite to where the gap is.
If the gap is less than an inch make the marks one eighth of an inch apart.
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.
Garage door springs offset the weight of the door and allow it to open and close with ease.
Garage door springs act as a counterbalance to the weight of all garage doors making them easier to open and close.
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.
If they have a lot of give you may want to consider replacing them.
First the floor may be so out of level that the garage floor does not meet the bottom edge of the door.
So with a gap on the left side you will begin leveling on the right side.
If it was opening too quickly move it to the next lower hole.
If the door was closing too quickly move the spring to the next higher hole on the bracket.
Garage springs are under an extreme amount of tension and either stretch or torque providing enough force to help you move the door.
Once the spring is free of tension remove from its track hanger.
To rise the side of the door that is lower turn the set screws in the drum clockwise.
Garage doors come in different styles that use two different types of springs.
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.
Remove any safety cables from the springs before loosening the springs themselves.
Second and far more critical is when the garage floor has begun to tilt backward toward the house.
Adjust the springs on both sides of the door the same way.