Maintenance · · 2 min read
The 30-second test that tells you a door is about to fail
A balanced door stays where you leave it. If yours drops or flies up when you let go, the spring turns are wrong — and it's quietly wearing out everything else.
There is one test that tells you more about a garage door than any other, and it takes half a minute. Engineers call it the balance test. It checks whether the spring is still doing its job.
How to do it
Half a minute, no tools
- Close the door fully.
- Pull the red release cord to disconnect the opener.
- Lift the door by hand to about waist height.
- Let go — carefully, hand ready.
- Watch what it does.
A door in good balance will hang still, roughly where you left it, held there by the spring alone. That is what “balanced” means: at every height, the spring’s torque equals the weight still hanging on the cables.
The door holds its position, or drifts only very slowly. It lifts and lowers with two fingers of effort. That is a door that is easy on its opener and its cables, and quiet to run.
What the failures mean
If the door drops when you let go, the spring has lost turns — it is under-wound or weakening, and it can no longer hold the weight. If the door flies up, it is over-wound. Either way the balance is wrong, and every cycle from now on drags rollers, cables and the opener through a load they were not meant to carry.
Never adjust the spring yourself. A torsion spring holds a large amount of stored energy. Winding bars slip, and the injuries are serious. Balance work is a job for someone with the right bars and the right technique.
Left alone, an unbalanced door is the slow, expensive route to a call-out: it strains the opener until the motor gives up, and it frays cables until one lets go. Catching it at the balance test is the cheap version.
A tune-up sets the balance right
We adjust the spring turns to the door’s measured weight, lubricate the moving parts, and leave it floating at half-travel.