The Ninety-Second Balance Test That Explains Most Garage Door Faults
There is one check on a garage door that tells you more than all the others put together, it takes about ninety seconds, it costs nothing, and in fifteen years of doing this we have met perhaps a dozen homeowners who had ever run it.
Close the door. Pull the red cord. Lift it to waist height by hand and let go.
Everything below is about why that matters.
A Garage Door Is a Counterweight, Not a Lift
The thing most people get wrong about a garage door is what the opener is for.
A residential sectional door weighs somewhere between 130 and 350 pounds, depending on whether it is single-skin steel, insulated steel, or a wood-clad carriage door that somebody chose because it looked right on the house. Nobody, including the opener, lifts that.
Above the opening sits a steel shaft with one or two torsion springs wound onto it. Those springs are wound to store almost exactly the potential energy of the door at its top position. As the door rises, the springs unwind and hand that energy back. As it lowers, the door winds them up again.
Done correctly, the two cancel out. A properly set door weighs eight to twelve pounds in your hands at any point in its travel. Not zero. A small residual weight is deliberate, so the door settles on the floor and stays shut rather than floating around in the wind.
The opener does not lift the door. The springs do. The opener nudges an already weightless object up and down a track and holds it in position. A half-horsepower unit is engineered around roughly 10 to 15 pounds of net effort, which is why an opener the size of a shoebox can move a door the size of a wall.
Once you have that picture, the rest of this article is fairly obvious.
Running the Test
Step one. Close the door fully and make sure nothing is under it.
Step two. Pull the red emergency release cord hanging from the trolley. That disconnects the door from the opener carriage. The door is now on its own.
Step three. Lift by hand. Note the effort. Near the floor is where a door is heaviest, because the springs are at their most wound and the geometry is least favourable, but it should still be manageable with two hands and no straining.
Step four. Take it to about waist height and let go. Stand clear as you do.
Step five. Watch for five seconds.
Then repeat the release at knee height and again near the top, because a door can be right at one point in its travel and wrong at another.
Step six. Re-engage. Most trolleys re-latch by running the opener through one full cycle, so press the button and let it complete. Some older units need the cord pulled back toward the door first.
Reading the Result
It holds still
The balance is good. Creeping an inch or two over several seconds is normal and not worth chasing. You have just confirmed the single most useful fact about your garage door, and you are done.
It sinks
The springs are not holding up their share. Either they have fatigued over their cycle life, or the door has gained weight since they were fitted. Adding an insulation kit, swapping a cracked panel for a heavier one, or fitting a new bottom seal all shift the number.
This is the common fault, and it is the one that runs up bills elsewhere.
It climbs
Over-wound. Somebody has put too many turns on, usually while trying to make a slow door move faster. The door will not sit shut on its own now, so the opener has to pull it down and hold it there against the springs on every single cycle.
Less common than sinking, considerably worse for the top of the door.
It is stiff, or it moves in jerks
That is not primarily a balance problem. Stiff means friction: bent track, a roller with a flat spot, a hinge that has bound up. Jerky often means the two sides are not lifting together, which points at cable or drum timing.
Worth knowing, because the fix is different.
The Bill Balance Runs Up Everywhere Else
Here is why a homeowner should care about a spring measurement.
The opener goes first. A door that hands its opener fifty pounds instead of twelve produces exactly the symptoms people describe as a dying opener: slow travel, straining, stopping halfway, reversing for no visible reason. The reversing is not a fault. It is the force limit doing its job, which is what stops a garage door closing on a child.
Inside the unit, the nylon drive gear on a chain-drive opener shreds its teeth. That is the classic overload signature, and it is a cheap part fitted to a problem that will eat the next one too. We are called out to second and third openers on the same unbalanced door more often than we would like.
The rollers go next. On a balanced door the rollers guide. On a heavy one they carry, and they carry unevenly because the load shifts to whichever side is lagging. A roller that gets dragged instead of rolled wears a flat on the wheel, and once it has a flat it stops turning altogether and slides. That is the grinding people describe as the door sounding full of gravel.
Then the hinges. Each hinge has bolt holes through the panel and a pin for the roller stem. Under an uneven load those holes go from round to oval, the hinge starts moving against the panel on every cycle, and the section begins to sit out of square with its neighbour. The centre hinges take the worst of it.
Then the top section, which is the expensive one. An over-wound door has to be pulled shut by the opener arm, and that arm bolts to a bracket on a fairly thin panel. Every close cycle transmits the fight between the springs and the motor into that bracket. What you see is stress cracking radiating from the bolts, then the bracket lifting proud, then the bracket tearing out. At that point you are replacing a panel, and on a door more than ten years old, matching that panel is often simply not possible.
So the chain runs: nobody checks balance, the springs relax, the opener gets replaced twice, the rollers grind, the hinges elongate, and eventually the top section cracks and somebody is quoted for a whole new door. The original fault was two turns of tension.
Tension Is a Number
Torsion springs are wound in turns, and the target follows the door height. Roughly one turn per foot of travel plus half a turn. A standard seven-foot door lands near seven and a half turns. An eight-foot door near eight and a quarter.
That is a starting figure, not the answer. The answer is whatever number leaves the door holding still at waist height, which is why any honest tension job ends with the balance test being run again rather than assumed.
It also means “it feels about right” is not a setting. Plenty of doors in Long Beach are running on tension somebody eyeballed, or on springs sized for the door as it was before an insulation kit went on it.
Springs also carry a cycle rating. A standard 10,000-cycle spring is about seven years at four cycles a day. High-cycle springs go to 20,000 or more and cost sensibly more. If yours are well past their rating, adding turns to a fatigued spring buys a few months and moves it closer to parting.
The Part We Will Not Talk You Through
Run the balance test. Please. It is safe, it takes ninety seconds, and more people should do it.
Do not adjust the springs.
A wound torsion spring holds enough stored energy to break an arm or take out teeth, and it releases all of it instantly if a winding bar slips out of the cone. That is where the serious injuries in this trade happen, and they happen to confident people with the wrong bar. Screwdrivers and rebar are not winding bars.
Rollers, bottom seals, photo eye alignment, hinge bolts on a door with the tension off: all reasonable homeowner jobs. Spring tension is not one of them.
Two Things Worth Checking While You Are There
With the door running normally again, test the reversal. Lay a two-by-four flat on the floor under the door and close it. The door must strike the timber and reverse. That entrapment protection has been required under UL 325 for decades and it depends on the force setting being low, which it will not be if somebody has cranked it up to shift a heavy door.
Then wave something through the photo eyes near the floor while it closes. It should stop and reverse.
And if your opener was installed in California from July 2019 onward, it has a battery backup under SB-969. Those batteries last three to five years and fail quietly, so press the test button.
The Short Version
If your garage door does not stay put at waist height with the opener disconnected, do not buy an opener. Ring somebody and have the balance sorted first, because everything else you are about to spend money on is a symptom.
Bitblitzcom does balance and tension work across Long Beach. Call (562) 370-3770.
Need help in Long Beach?
Call (562) 370-3770