Stripped drive gear
The plastic worm gear inside the motor head shears its teeth. Motor runs with a grinding whirr, nothing moves. A gear kit and an hour fixes it — and it is very often a dying spring that caused it.
01 Component repairs
Garage door opener repair in Evanston, IL
Most openers we are called to have not failed. The ones that have are usually repairable for a fraction of a new unit — a gear kit, a trolley, a capacitor, a board. We check which of those it is before quoting anything.
- Drive gears, trolleys, logic boards, capacitors and sensors
- Chain, belt and screw drive units
- Common gear kits and sensor sets carried on the van
- Force and travel limits set correctly, never turned up to hide a bind
02 What actually breaks
Six failures that account for most opener repair calls
In rough order of how often we find them. Note that the most common cause of an opener call is not on this list at all, because it is not the opener.
Worn trolley or carriage
The part that rides the rail and grabs the door arm. When the release mechanism wears or the inner sleeve splits, the door disconnects itself mid-travel or refuses to re-engage after you pull the red cord.
Failed logic board
Lights flash a code, or the unit ignores one input and answers another. Surge damage is common — an unheated detached garage on an old branch circuit is not a gentle electrical environment.
Capacitor failure
The motor hums but will not start, or starts only if you help the door. A cheap part and a short job, and frequently the difference between a repair and an unnecessary new opener.
Photo-eye sensors
The door closes a foot and reverses, or will not close unless you hold the wall button. Misalignment, a cobweb, a knocked bracket — or low winter sun straight down the alley into the receiving eye.
Wall control and wiring
The remote works and the wall button does not, or the reverse. Usually a broken low-voltage staple run, a corroded terminal, or contacts that have given up after twenty years of thumbs.
03 The expensive mistake
Before you buy an opener, check that the opener is what failed
This is the single most common misdiagnosis in the trade, and it costs Evanston homeowners real money every winter. The opener runs. The door does not move. Everyone concludes the opener is dead. It usually is not.
Your door weighs between roughly 130 and 400 pounds. The opener does not lift that and was never designed to — the springs do, and the opener is a positioning motor guiding an already-balanced door along a track. When a spring breaks, the opener is asked to deadlift the whole door through a chain and a plastic gear. It stalls, strips the gear, or lifts six inches and reverses. All three look exactly like a dead opener.
The sixty-second test
- Close the door. Pull the red release cord to disconnect the trolley from the door arm.
- Lift the door by hand. It should rise smoothly and stay put at waist height.
- If it will not budge, or crashes back down when you let go, the problem is the springs, not the opener. Buying a new opener will get you a new opener that fails the same way.
- If it lifts easily and holds, the door is balanced and the fault really is in the head unit. That is what this page is about.
Look up at the steel shaft above the opening while you are there. A clean one-inch gap in the coil answers the question outright. If you find one, stop, leave the door down, and call (224) 505-2236 — every additional attempt with the opener risks a bent top section on top of everything else.
04 Symptom triage
What the opener is doing, and what it usually means
What we run through mentally when you describe the fault on the phone. It narrows most calls to two possibilities before we load the van.
| What you are seeing | Usual cause | Typical fix |
|---|---|---|
| Motor runs, grinding noise, door still | Stripped drive gear — or a broken spring that caused it | Gear kit, after checking the door balances by hand |
| Motor hums but will not start | Capacitor, or a seized motor | Capacitor replacement is the first thing to try |
| Door reverses about a foot after touching the floor | Close force or down-limit set wrong, or a bind in the track | Reset the limits and find the bind — never raise the force |
| Door reverses immediately on closing, sensor light blinking | Photo-eyes misaligned, obstructed, or sun-blinded | Realign, clean, re-bracket, and shade the receiving eye if needed |
| Trolley disconnects mid-travel | Worn trolley or a failed release mechanism | Trolley replacement |
| Wall button works, remotes do not | Lost programming, dead remote battery, or a failing receiver | Reprogram; replace receiver or board if it will not hold |
| Remotes work, wall button does not | Broken low-voltage run or a failed wall control | Trace and repair the wiring, or replace the control |
| Unit lights flash a pattern and nothing happens | Logic board fault or a sensor circuit fault | Diagnose the code, then board or sensor replacement |
| Works fine in summer, poorly below freezing | Dry or thickened lubricant, or a door binding on a frozen seal | Service the rail and free the bottom seal — see the door, not just the head |
Not on the list? Call (224) 505-2236 and describe it. Fifteen years of these means we can usually narrow it down before we arrive. If the door itself is misbehaving rather than the motor, start with general repair.
05 The trap
Never turn the force up to make a problem go away
Here is the sequence we find in perhaps one garage in five. A door starts binding — a dry roller, a track pushed out of plumb by a settled slab, a spring losing tension. The opener senses resistance and reverses, because that is exactly what it is built to do. Someone finds the force adjustment and turns it up until the door stops reversing.
The bind is still there. The door is still fighting. What has changed is that the safety system which was protecting a child, a pet or your own hand has been dialled out of the way. An opener with the down-force wound up will keep pushing a closing door into whatever is underneath it.
Force settings are a diagnostic reading, not a volume knob. If a door needs more force this year than last, something mechanical changed, and that is the thing to fix. DASMA's guidance on opener operation is clear about it, and so is the CPSC on entrapment protection. We set force to the minimum that moves the door reliably, then test the photo-eyes and the mechanical reversal against an obstruction — every visit.
- A door that needs more force has a mechanical fault, not a settings problem
- Photo-eyes are a second line of defence, not the only one
- Both systems get tested against a real obstruction before we leave
- If we cannot make a unit reverse safely, we will tell you it needs replacing
06 The visit
How an opener call actually runs
The door comes first
Opener disconnected, door hand-balanced. If the door is not balanced, nothing we do to the motor head will hold, and we would be selling you a repair that fails.
Then the head unit
Gear condition, trolley wear, chain or belt tension, capacitor, board behaviour, and the sensor circuit read at the terminals rather than guessed from a blinking light.
Repair or replace, with numbers
A gear kit, trolley, capacitor or board is usually a fraction of a new unit. If parts are scarce, or the unit cannot be made to reverse safely, we say so plainly.
Set, test, hand over
Force and travel limits set to the door as it now behaves, both photo-eyes aligned and tested, remotes and keypad reprogrammed, and you cycle it yourself before we leave.
If the unit does need replacing, the installation page covers what suits a low-headroom detached garage — which in this housing stock is most of them.
07 Repair or replace
When fixing the opener is genuinely the better buy
We repair far more openers than we replace, and that is not charity — a gear kit is an hour and a part. The line falls roughly here.
- Repair: a stripped drive gear on an otherwise sound unit, whatever its age
- Repair: a worn trolley, a failed capacitor, a dead wall control or a broken low-voltage run
- Repair: sensor faults, lost remote programming, or limits that have drifted
- Repair: a logic board on a mechanically healthy unit with parts still available
- Replace: any unit that cannot be made to reverse reliably on an obstruction
- Replace: a very old unit with no photo-eye sensors at all — those pre-date entrapment-protection requirements
- Replace: when the repair bill approaches a new unit and rail, gearbox and board are all tired
- Replace: when the door got substantially heavier — usually an insulated door went on and nobody resized anything
We also check the mechanical reversal and both photo-eyes on every visit regardless of what you called about, following DASMA's system safety guidance. It takes two minutes and it is the part of the job that actually matters.
08 Drive types and local conditions
Chain, belt, screw — and what an Evanston garage does to all three
How each type tells you it is unwell
- Chain drive. The workhorse. Failure announces itself as rattle and slap, usually a stretched chain or a worn rail. Noisy by nature, which is fine over an alley garage and less fine under a bedroom.
- Belt drive. Quiet, and stays quiet until the belt frays or the trolley wears. A belt that has started to squeal or slip under load is telling you the tensioner or the belt itself is done.
- Screw drive. Fewer moving parts, more sensitive to temperature. In an unheated garage the grease on the screw thickens as the temperature drops and the unit slows noticeably in January. Often it is a lubrication service, not a fault.
What this climate does to an opener
The NOAA normals show 121 days a year with a low at or below freezing, a January average high of 31.6°F against a low of 18.8°F, and six and a half days at or below zero. The motor head in a detached garage lives in all of it. Lubricant thickens, plastic goes brittle, and a bottom seal frozen to the slab makes the first lift of the day several times heavier than normal. That frozen lift strips gears. If your unit only misbehaves in cold weather, service it before you condemn it — the climate numbers explain more faults here than any manufacturer defect.
Two more local specifics. Low winter sun down an east–west alley can flood a photo-eye receiver and make a perfectly aligned sensor read as blocked, which is why we re-bracket and shade rather than just realign. And road salt — 3,377 tons of granular plus 52,616 gallons of brine across 190 miles of Evanston road in one winter — gets into the terminals of sensor brackets mounted six inches off the slab, which is where the intermittent faults come from.
What we will tell you first
If the door is the problem, we fix the door rather than the motor — springs, cables, rollers or track, depending on what we find, and usually for less than the opener you were about to buy. If everything is tired at once, replacement is a conversation with real numbers on both sides.
We cover Evanston and the near North Shore from Brown Ave — south Evanston, downtown, Skokie and Lincolnwood are short runs. If your car is shut in behind a dead opener, say so when you call (224) 505-2236. See hours and how to reach us, or our buying guide for old garages.
06 Questions we get asked
Opener questions from Evanston homeowners
What people ask before they spend money on a new unit they may not need.
My opener runs but the door does not move. Is the opener dead?
<p>Probably not. Pull the red release cord to disconnect the trolley and try lifting the door by hand. If it comes up smoothly and holds at waist height, the door is balanced and the fault really is in the motor head — most likely a stripped drive gear, which is a part and an hour rather than a new unit. If the door will not move by hand, or feels enormously heavy, a spring has broken and the opener was just the thing that noticed. Look up at the shaft above the opening for a gap in the coil. Replacing the opener in that situation buys you a new opener that fails the same way.</p>
Is it worth repairing an old garage door opener?
<p>Usually yes, and we repair far more than we replace. Drive gears, trolleys, capacitors, wall controls, sensors and low-voltage wiring are all cheap parts and short jobs, and a unit that is mechanically sound has no reason to be scrapped over one of them. The clear exceptions: any unit that cannot be made to reverse reliably on an obstruction, and any unit old enough to have no photo-eye sensors at all. Those pre-date entrapment-protection requirements and we will not leave one in service. Otherwise, we quote the repair and the replacement and let you compare.</p>
My door closes then goes straight back up. What is wrong?
<p>Two candidates. Most often it is the photo-eye sensors — the pair mounted about six inches off the floor on each track. If one is knocked out of alignment, dusty, cobwebbed, or blinded by low winter sun coming straight down the alley, the opener assumes something is in the way. Check both indicator lights are steady, not blinking. The other candidate is the close force or the down travel limit set wrong, or a genuine mechanical bind the opener is correctly refusing to push through. Do not solve it by turning the force up. That removes the protection instead of the problem.</p>
Can you just turn the force up so it stops reversing?
<p>No, and anyone who offers to should worry you. Force settings are how the opener detects that something is in the way — a bin, a bicycle, a person. Winding them up so a binding door stops reversing means the door will also keep pushing on whatever else it meets. If a door needs more force than it did last year, something mechanical changed: a dry roller, a track knocked out of plumb, a spring losing tension. We find that instead. Then we set force to the minimum that moves the door reliably and test the reversal against an obstruction while you watch.</p>
Why does my opener only struggle in winter?
<p>Because it lives in an unheated building through 121 days a year with a sub-freezing low. Three things happen. Grease on a screw drive or in a gearbox thickens and the unit slows. Plastic parts get brittle and a marginal gear picks a cold morning to shear. And the bottom seal freezes to the slab overnight, so the first lift of the day is several times heavier than the opener expects. That last one strips more gears in January than any other single cause. Free the seal, service the rail, and replace a hardened bottom astragal before you condemn the motor.</p>
I lost my remotes. Can you reprogram them?
<p>Yes, and it is a small job. Programming lives in the receiver, so remotes and wireless keypads get learned back in at the head unit or the external receiver. If a remote has been lost rather than broken, the right move is to clear the receiver's memory entirely and reprogram only the remotes you still have, so the missing one no longer opens your garage. That is worth doing properly. We will also set up the keypad code and show you how to change it yourself, because you should not have to call anyone for that.</p>
The wall button does nothing but the remote works. What is that?
<p>Almost always the low-voltage wiring or the wall control itself, not the opener. That thin two-conductor wire is usually stapled along a joist and down a wall, and in a detached garage it has spent decades being nicked by a ladder, chewed at a staple, or corroded at the terminals where salt-laden damp air sits. We test it at both ends, repair or re-run the section that has failed, and replace the control if the contacts have worn out. It is one of the cheaper faults on this list and it is very often mistaken for a dead opener.</p>
Do you work on openers in detached alley garages with no proper power?
<p>Constantly — it is most of the housing stock we serve. What we cannot do is electrical work beyond the unit itself. If the garage is fed by an extension lead, an ungrounded outlet or a circuit that trips whenever the compressor runs, we will tell you that the opener faults you are seeing are downstream of a supply problem and that an electrician needs to sort the circuit first. Fitting a new opener onto bad power just moves the failure. We would rather say that at the door than take the money.</p>
Garage door stuck, loud, or off its tracks?
One call reaches the people who will actually be doing the work. Tell us what the door is doing and we will tell you straight what it needs — and when we can get a truck to you.