How to Adjust Garage Door Springs

Garage door springs are the hardest-working component in your garage. They support the full weight of the door—typically 300 to 400 pounds—and control its movement up and down. Over time, springs lose tension and the door won't open smoothly or will sag on one side. You'll notice it immediately: the door feels heavier, rises crookedly, or the opener works harder than it should. Adjusting the springs restores balance and smooth operation. Unlike spring replacement (which requires special tools and knowledge), adjustment is something you can handle with basic tools and care.

1. Disconnect the opener and secure the door. Unplug the garage door opener from the outlet. Manually lift the door fully open and prop it with a wooden block or locking pliers on the track on each side to lock it in place. This prevents the door from rolling down while you work and removes power from the system entirely. Never work on springs with the opener plugged in.
2. Identify which spring needs adjustment. Open the door fully and observe how it sits. If one side is higher than the other, the lower side's spring has less tension. If the door is level but feels heavy or won't stay open without the prop, both springs are weak and need equal adjustment. Look at the spring assembly above the door—you'll see two springs, one on each side, running horizontally along the top of the door frame.
3. Loosen the set screws on the spring bracket. Using an adjustable wrench or socket set, locate the two set screws that hold the adjustment collar to the spring bracket. These sit on the bracket where the spring assembly mounts to the wall. Loosen them by turning counterclockwise—you want them loose enough that the collar can turn, but not so loose they fall out. A quarter-turn is usually enough.
4. Turn the adjustment collar to change spring tension. Using an adjustable wrench, grip the adjustment collar (the hexagonal or round piece where the spring connects). Turn it counterclockwise a quarter-turn to reduce tension on a spring that's too tight, or clockwise a quarter-turn to increase tension on a weak spring. Make small adjustments—quarter-turns—and test the door between each adjustment. Too much tension will make the door hard to open; too little and it won't stay open.
5. Test the door balance. Pull out the wooden block slightly and let the door rest on its own. It should stay level and hold position without drifting up or down. If it sinks, tighten the springs (turn clockwise). If it wants to float up, loosen them (turn counterclockwise). This is trial and error—make a quarter-turn, test, repeat until the door hangs level and stable.
6. Retighten the set screws firmly. Once the door hangs level and moves smoothly, tighten both set screws on the adjustment collar back down. Use steady pressure with your wrench and turn clockwise until snug—don't overtighten, as you may need to adjust again, but tight enough that the collar won't turn under normal use.
7. Reconnect the opener and run a full cycle test. Plug the garage door opener back in. Use the remote or wall button to open and close the door through a full cycle. The door should rise and fall smoothly without binding, noise, or hesitation. If it operates quietly and evenly, you're done. If something feels wrong, unplug the opener again and revisit the tension.
8. Lubricate the springs and tracks for smooth operation. Once the door is balanced, spray the springs and rollers with a light garage door lubricant or white lithium grease. This reduces friction and keeps the springs working smoothly long-term. A light coating on the tracks and roller wheels also helps.