How to test garage door balance (and what the result means)
A balanced door feels almost weightless. The springs carry it and the opener only guides it. When the springs don't match the door, the opener works harder, parts wear faster, and the door can drop. The balance test finds that in about two minutes.
How to run the test
- Close the door and pull the opener's emergency release so the door moves by hand. Only release it with the door closed: a door with a broken spring can fall if it's released while open.
- Lift the door by hand to about halfway and let go gently, with your hands ready.
- Watch what it does. Then repeat near the bottom (about knee height) and near the top (about shoulder height).
- Reconnect the opener when you're done.
Reading the result
- Stays put or drifts slowly: balanced. Nothing to do.
- Falls: the springs are too weak for the door. Springs lose tension with age, the wrong springs may have been installed, or the door may have gotten heavier (new insulation, a glass section, a heavier bottom seal).
- Rises: the springs are too strong. Usually that's too many turns, or springs sized for a heavier door.
A door that balances in the middle but rises near the bottom and falls near the top (or the reverse) usually has springs of the wrong size, with the turns adjusted to make up for it. Adding or removing turns only moves the problem. The diagnose flow in the spring calculator helps sort out which.
Fixing an out-of-balance door
A quarter turn on torsion springs can fix a small drift. Anything more usually means the springs are wrong for the door: measure them, weigh or estimate the door, and size the right pair. The spring identifier shows what door the current springs were built for, and the weight estimator checks the door.
Safety: torsion springs hold enough energy to break bones. Adjust them only with proper winding bars, never screwdrivers, and never stand in line with the bar. Extension springs are adjusted with the door fully open and secured, so the springs are relaxed. The step-by-step door balance procedure covers both.
Make it routine: run the balance test on every service call, not just spring jobs. It takes two minutes, catches a tired spring before it breaks, and gives the customer a clear reason to consider better springs.