A garage door that suddenly won’t budge or slams down with a bang is almost always a spring problem. The spring carries the door’s weight, and the opener guides it along the tracks. When the spring fails, that balance breaks down fast.
If you’re staring at a stuck door in Pennsburg or East Greenville, here’s what’s happening and what a garage door spring replacement actually involves.
A correct replacement means measuring the old spring’s exact size and matching a new one to your door’s weight. The technician finishes by testing the door’s balance by hand before calling the job done. Valley Lock & Door, licensed and insured out of East Greenville since 2011, treats this as a professional-only job.
The Spring Carries the Door’s Weight
Garage doors weigh 150 to 400 pounds, more than an opener is built to lift alone. The spring counterbalances the door so the opener only guides it.
Remove the spring, and the opener does a job it was never built for, causing frequent breakdowns on a door that used to run fine.
You can hear it happen. A door with a good spring lifts smoothly and quietly. Once the spring goes, it starts working with a strained sound, before you spot the broken coil. If the door isn’t just straining but won’t budge at all, the wider list of causes is in our full breakdown of why a garage door won’t open.
Garage Door Torsion Springs vs. Garage Door Extension Springs
There are two spring systems, and they work in completely different ways.
Garage door torsion springs mount on a torsion shaft (a metal rod) above the door opening, twisting to build tension and unwinding to lift the door. This torsion system is standard on modern garage doors.
Garage door extension springs mount on the sides of the door and stretch as the door slides along the tracks. They’re common on older Pennsburg and East Greenville homes and always need a safety cable running through them. Without that cable, a broken spring can snap loose with real force. The table below shows how to tell them apart.
| Torsion Springs | Extension Springs | |
|---|---|---|
| Mounted | On a shaft above the door | Along the side tracks |
| Motion | Twists to build tension | Stretches to build tension |
| Common on | Most modern doors | Older or lighter doors |
What this means for your home: If your house is older and still runs on extension springs, mention that when you call. It changes which parts your technician brings.
How Long Do Garage Door Springs Last?
Torsion springs are rated for 10,000 to 20,000 cycles. Extension springs run shorter: 5,000 to 15,000 cycles. One cycle is a single open and close, and a household using the garage as its main entrance runs through four to six cycles a day. At that pace, a standard 10,000-cycle spring lasts about 5 to 7 years, while a higher-rated 20,000-cycle spring stretches closer to 9 to 14 years.
Pennsylvania winters add extra wear, since cold metal is more brittle. Old springs reaching complete failure within that window isn’t bad luck.
What this means for your wallet: If your springs are 7 or more years old and never replaced, plan for it before they snap.
Signs Your Garage Door Spring Is Broken
When homeowners call us about a door that stopped working, the spring is the first thing we check. These are the signs that send us straight to it:
The door feels like dead weight when you try to lift it by hand
A loud bang came from the garage right before the door stopped working
There’s a visible gap in the coil where it should be wound tight
The door closes crookedly or rises higher on one side
The opener runs and the motor hums, but the door barely moves
The garage door cables along the side of the door look frayed or loose. When a spring fails, the cables lose tension too, and a slack cable can slip off the drum
You notice unusual noises, like grinding or squealing, that weren’t there before
Any one of these on its own is worth a call. Several together mean the spring has failed. Catching these signs early beats waiting for a repeat visit, and our spring safety guide has more on what to watch for between service calls.
Why Won’t My Garage Door Open After a Loud Bang?
A loud bang almost always means a torsion spring just broke, snapping under tension. Once it’s gone, the opener has nothing left to counterbalance the door’s weight, so it won’t lift even though the motor still runs.
Why Garage Door Spring Replacement Is a Professional Job
A torsion spring stores hundreds of pounds of energy under extreme tension. Releasing it safely takes specialized tools: winding bars sized to the spring and a socket wrench for the set screws. A sturdy ladder and safety glasses are part of the job too.
DASMA, the trade group representing garage door manufacturers, is direct about it: springs are among the most dangerous parts of your door, and improper handling causes serious injury. Extension springs carry their own risk, since a spring that lets go under load can whip around if the safety cable isn’t doing its job.
A case series on open globe injuries from garage door springs, meaning injuries severe enough to rupture the eyeball itself, notes that garage doors injure around 35,000 people in the US every year. Reviewing seven patients with open globe injuries treated over 15 years, the authors found that when a garage door spring strikes someone in the eye, the injury is a severe, vision-threatening open globe injury about half the time.
Can You Replace a Garage Door Spring Yourself?
Replacement springs are available online, so yes, this could be a DIY project. Whether you should attempt it is a different matter. Without properly sized winding bars, an improvised tool can slip, releasing stored tension with enough force to cause serious injury. Hire a professional technician with the right tools instead.
What a Correct Garage Door Spring Replacement Includes
Replacing garage door springs right starts with an accurate measurement. That means the inside diameter (most residential springs run 1 3/4 or 2 inches) and the wire size, measured by counting across ten coils. Length matters too, measured only once the spring is fully unwound. Two springs on the same door can differ, so each gets checked individually.
Matching the right spring type to the door size and weight matters, since a spring even slightly off wears out fast or strains the opener. If the door runs on two torsion springs, both get replaced together so their age and tension stay matched.
The technician also checks cables and rollers for wear that’s easy to miss from the ground, since a worn or frayed cable often needs its own fix. Cable drums and bearing plates get checked too.
Once the new springs go in, spring tension gets set to match the door, finishing with a hands-on balance test: disconnect the opener, lift the door halfway by hand, and let go. A properly balanced door stays put and runs with smoother operation.
Should You Replace One Spring or Both?
If your door runs on two torsion springs and one breaks, replace both. They wear at close to the same rate, so the old spring won’t outlast the new one by much. Replacing only the broken spring means a second service call within a year or two.
A Bad Spring Puts Stress on Your Garage Door Opener
An unbalanced door doesn’t just sit there being difficult. The opener has to work harder to compensate, which shortens its lifespan and can burn it out early.
Fixing the spring properly protects the entire garage door system. If a bad spring has already taken a toll on the door itself, our guide to repairing versus replacing a garage door can help you weigh the next step.
Ruling Out Other Causes
Not every stuck door is a spring issue. Check the opener first if the door won’t respond. A door stuck at an angle or off its tracks points to a separate track problem rather than the spring, and sensor issues show up as a door that reverses on its own.
If the spring isn’t the culprit, our garage door troubleshooting guide walks through the other causes.
Serving Eastern Pennsylvania Homeowners
We’ve served the Upper Perkiomen Valley plus Montgomery, Bucks, Berks, and Lehigh counties since 2011, licensed and bonded. When a spring goes, we diagnose the actual door and back it with professional installation done right the first time.
If your garage door is stuck, making noise, or hanging crooked, contact us at (267) 923-5759 for a free estimate.
Kevin N.
“Great local company. I had an unusual request to move my door springs from the rear of the tracks to the front so I could install a car lift. Although the manufacturer of my door was no longer in business, Bob was able to come up with a solution to make it work. The custom parts required took awhile to arrive, but it’s at no fault of Valley Lock & Door, and Jen scheduled the work as soon as the parts were due to arrive. Tom did the work and it’s exactly what I asked for. The door works better than ever and gives me the room I required.”
Springs are just one part of the garage door repairs we handle day-to-day.
