Garage Door Won't Stay Open Halfway - How to Fix the Balance
So you lift the door manually, let go at waist height, and it just drops. Or you open it all the way and it slowly creeps back down on its own. Either way the door isn't holding position and that's a spring balance problem almost every time.
Here's what's actually going on and what to do about it.
Why the door should stay in place
Garage doors are heavy. A standard single car door weighs 130 to 200 pounds. A double can be 200 to 300. The spring - or springs - are what make it manageable. They store tension when the door closes and release it when the door opens, counterbalancing the weight so the door feels light and stays where you put it.
When that balance is right, you can lift the door to any height, let go, and it holds. Drifts maybe an inch or two at most. That's a properly balanced door.
When the balance is off - springs losing tension, one spring weaker than the other, springs replaced but not tensioned correctly - the weight wins. Door drops.
The balance test
If you haven't done this yet, do it now. Pull the red cord hanging from the opener rail - that disconnects the door from the drive so you can move it by hand. Lift the door to about waist height, roughly halfway up. Let go.
What happens next tells you a lot.
Stays in place or drifts slightly - balance is good, springs are probably fine, the problem is something else.
Drops relatively fast - springs are losing tension or are significantly out of balance. The door weight is winning.
Shoots up toward the ceiling - springs are wound too tight. Overcorrected at some point or wrong springs for the door weight.
Either direction of failure is a problem. Both mean the springs need adjustment.
What causes the balance to go off
Springs lose tension gradually over thousands of cycles. It's not sudden - they slowly unwind past their optimal tension point and the counterbalance weakens. Heavy use households get there faster. This is just normal wear.
One spring on a two-spring setup wearing faster than the other. This happens more than people realize. Springs on the same door don't always wear evenly - if the door was slightly off-balance before, one spring carried more load. It fatigues faster. Now the two springs are at different tension levels and the door tilts or drops unevenly.
Spring replaced without being set to the correct tension for that specific door's weight. Torsion springs need to be wound to a specific number of turns based on the door weight, spring size, and drum diameter. If someone rushed the job or guessed at the turns, the balance won't be right from day one.
Wrong spring for the door. If the door was replaced or modified and the springs weren't changed to match the new weight, the spring tension is calibrated for a door that no longer exists. Balance will be off.
Can you adjust the spring tension yourself
For extension springs - the type that run along the side tracks - adjustments involve the cables and safety cables. Not impossible for someone comfortable with the system but there's tension involved that you need to respect.
For torsion springs - the horizontal spring above the door - the answer for most people is no. Adjusting torsion spring tension requires winding the spring with steel winding bars while it's under load. If a bar slips, the energy releases violently. This is one of those jobs where the injury risk from doing it wrong is real and significant. Techs have the right bars, know the correct turns for different door weights, and do this regularly.
Getting the balance wrong in the other direction - spring wound too tight - is also a problem. An overly tight spring causes the door to fly up when released and puts excess load on the opener every close cycle.
What proper adjustment costs
Spring tension adjustment without replacing the springs - usually $75 to $125 for a service call. If the springs are still in reasonable shape and just need to be set correctly, this is usually a fast fix.
If the springs are worn and need replacing as part of getting the balance right - $150 to $300 depending on single or double spring setup. Worth doing both at once if they're getting old.
Other things that cause a door to not stay open
Worth ruling these out if the spring balance test actually came back okay.
Track issues at the curve - the horizontal section of track that goes back toward the ceiling has to be angled correctly. If the angle is too steep the door slides back down under its own weight. A tech can assess and adjust track angle.
Rollers that are binding or rough - enough friction in the wrong spot can cause the door to settle out of position over time. Spin the rollers by hand and check for stiffness.
Opener trolley dragging on the rail with the door disconnected - should move freely. If it's dragging it can pull the door in one direction.
A door that won't stay up is almost always telling you the spring balance is off. The balance test takes thirty seconds and tells you immediately whether that's the case.
If it is - GarageDoorRepairz can come out, set the tension correctly, and make sure the door holds position properly. Give us a call.
What happens if you ignore a balance problem
The opener takes the hit. When springs are under-tensioned, the door is heavier than the opener was designed to lift. Every open cycle the motor works harder than it should. Over months this burns out the motor faster, strips the drive gear, and wears out components that would have lasted years longer with a properly balanced door.
People replace openers thinking the opener is the problem when really it's the springs. New opener goes in, same spring issue, new opener starts wearing out the same way. I've seen this happen more than once.
The opener is designed to guide a counterbalanced door - not lift a heavy one. Fixing the spring balance protects the opener.
After the adjustment - how to verify it worked
Do the balance test again. Pull the cord, lift to waist height, let go. Holds in place? Good. Try it at a few different heights - one foot off the ground, halfway, three quarters of the way up. Should hold at all of them without significant drift.
Also check how the door feels to lift manually. Should feel light - like you're mostly just guiding it rather than lifting it. If it still feels heavy, the tension isn't fully corrected.
Run the opener a few times and listen. If the motor sounds more relaxed than it did before - less strained, opens faster - the balance correction is taking load off it the way it should.
One thing people don't know about spring balance and cold weather
Springs tighten slightly in cold temperatures - metal contracts. This means a door that's balanced correctly in summer can feel slightly different in winter. The spring is a bit stiffer, the door might feel a touch lighter because the spring tension has effectively increased a small amount.
This usually isn't enough to cause real problems on a door that's properly balanced to begin with. But on a door that's already borderline - springs that are getting old and losing tension - the seasonal change can push it over the edge. Door that held position fine all summer starts dropping in January.
If your door started having balance issues in winter specifically, that's worth factoring in. The springs might be right on the edge of their useful life and the cold is exposing it.
GarageDoorRepairz - give us a call and we'll get the balance sorted out properly.