Garage Door Springs Do the Lifting, Not the Opener
September 3, 2026
Ask most people what lifts their garage door and they will say the opener. It is a reasonable guess and it is wrong. The opener is a small motor, usually less than one horsepower, and it could not lift a sectional door if that were its job. What actually lifts the door is a set of springs storing enough energy to counterbalance the entire weight of it, so that the door effectively weighs almost nothing while it travels. The opener only nudges a nearly weightless object along a track.
Once you understand that, most garage door behaviour stops being mysterious. A door that struggles, reverses, slams, or feels impossibly heavy by hand is almost never an opener fault. It is a counterbalance that has drifted out of adjustment or a spring that is at the end of its service life.
That is also why an honest overhead door service call starts with the springs and the balance test rather than with the machine bolted to the ceiling. Anyone who opens the conversation by quoting a new opener before touching the door by hand has skipped the diagnosis entirely, and you are likely to end up paying for a machine that was never the problem.
The two spring systems, and how to tell which you have
Torsion springs
Torsion springs sit on a steel shaft above the door opening, usually one or two of them, wound tight. When the door goes up, the springs unwind and hand their stored energy to cables that lift the door. They are the more common modern arrangement, they last longer, and they fail more predictably.
Extension springs
Extension springs run along the horizontal tracks on either side, parallel to the ceiling, and they stretch rather than twist. They are older, cheaper, and the important thing to know is whether they have containment cables running through them. A stretched spring that lets go without a containment cable becomes a projectile. If you look up and see long springs beside the tracks with no cable threaded through the middle, that is worth fixing on its own merit, regardless of how the door is performing.
The balance test, which costs nothing
This is the single most informative thing a homeowner can do, and it takes about a minute.
Close the door. Pull the release cord, the one with the red handle, to disconnect the opener. Now lift the door by hand to about waist height and let go.
A correctly balanced door stays roughly where you left it. It might drift slightly in either direction, and that is fine.
A door that drops immediately has springs that no longer hold the weight. They have lost tension, or one has broken.
A door that shoots upward is over sprung, which sounds harmless and is not. It puts the opener under load in the closing direction and it makes the door dangerous to handle manually.
A door that will barely lift at all almost certainly has a broken spring, and you should stop and leave it closed.
Reconnect the opener afterwards by pulling the cord again and running the door once.
Why a broken spring is not a repair to attempt
There is a clear line between the hardware a homeowner can reasonably touch and the parts that store enough energy to cause a serious injury. Rollers, hinges, brackets, weather seal and photo eyes sit on the safe side. Springs and cables do not.
A torsion spring is wound to a specific number of turns under significant tension. Adjusting one requires winding bars sized to the cones, and the failure mode when a bar slips is that the bar becomes a lever swinging at speed. This is the most common source of serious garage door injuries and it is entirely avoidable.
The second reason is subtler. Springs on a two spring door are replaced in pairs, even when only one has broken. They were installed together, they have been through the same number of cycles, and the survivor is by definition near the end of its own life. Replacing one is how a household ends up paying two call out fees inside a year.
Cycle life, which is the number nobody quotes
Springs are rated in cycles, one cycle being one full open and close. A standard spring is often rated around ten thousand cycles. That sounds like a lot until you count actual use. A household that opens the door four times a day reaches ten thousand in under seven years. A house where the garage is the main entrance, with teenagers and two cars, can get there in four.
Higher cycle springs exist, commonly rated at twenty five thousand or more. They cost modestly more, they look identical to an untrained eye, and they can double the service life. This is worth asking about by name when springs are being replaced, because the default supplied is usually the standard rating unless someone requests otherwise.
The reason it matters more than it sounds: replacing springs is mostly a labor cost. The parts are not the expensive half. Paying slightly more for parts that last twice as long is one of the few genuinely good deals in home maintenance.
What else fails alongside the springs
A door that has been running on tired springs has been putting load everywhere it should not.
The cables take the strain first. Look for fraying near the bottom bracket, where the cable wraps and takes the most wear. A frayed cable is a cheap part and an urgent one.
The bearings at each end of the torsion shaft, and in the middle on a wide door, wear too. A squeal that comes from above the door rather than from the tracks is usually a dry bearing plate.
The opener itself has been working harder than designed. If the door has been out of balance for a long time, the opener’s gears have been taking loads they were not built for, and a plastic drive gear that grinds and slips is the classic result.
The bottom bracket at each corner is the one part that is under spring tension even when the door is open. Its bolts are not homeowner adjustable for that reason.
Getting a straight quote
The useful thing to know before calling anyone is that spring work is fairly standardised. Ask for the spring rating in cycles, not just “new springs”. Ask whether both springs are being replaced. Ask whether the cables, bearings and bottom brackets are being inspected as part of the job or quoted separately afterwards. And ask for the balance to be tested by hand after the work, with you watching.
That last one is the real quality check. A door that has just had new springs fitted should pass the same waist height test described above. If it drops or climbs, the winding is not finished, and the correct time to say so is while the technician is still standing there.
A short maintenance list that actually helps
Twice a year is plenty for most households.
Run the balance test and note what it does.
Look at the cables at both bottom brackets for fraying.
Spin the rollers by hand and check for grit or refusal to turn.
Wipe the tracks clean but do not grease them. Tracks are a guide, not a bearing surface, and grease in a track collects grit and makes the problem worse.
Lubricate the hinges, roller stems, springs and bearing plates with a proper garage door lubricant rather than a general purpose penetrating spray. Penetrating sprays clean and evaporate, which is the opposite of what a bearing needs.
Test the auto reverse by placing a solid object flat under the door and running it closed. The door should touch, stop and reverse.
None of that costs anything except ten minutes, and it is the difference between replacing springs on a planned Saturday and discovering the problem at seven in the morning with a car sealed inside the garage.
