Arlington Heights, IL · Same-day service
Extension Spring Repair on Older Arlington Heights Doors
Plenty of garages in Arlington Heights are still running the spring system they were built with. Long springs stretched above each horizontal track, a cable and pulley at each end, and a door that has gone up and down since the neighborhood was new. It is a simple design and it works, right up until it does not.
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This is different work from torsion springs, with a different set of parts to check. We do it on the single-car doors near downtown and on the narrow two-car doors on the streets around them.
How an Extension System Works and Where It Gives Out
Torsion springs sit on a shaft above the opening and twist. Extension springs stretch. Each one is anchored at the back of a horizontal track, hooked to a pulley at the front, and a lift cable runs from that pulley down to the bottom bracket of the door. Closing the door pulls the springs long and stores the energy. Opening it lets them pull back.
Because the parts are separate rather than sharing one shaft, there are more places for it to go wrong. Pulleys seize. The small S-hooks and eye bolts at the anchor points wear thin. Cables fray where they ride the pulley sheave. A spring that has stretched past its return but has not broken yet leaves the door heavy on one side, which is what a crooked, lopsided lift usually means.
The Containment Cable, and Why We Raise It Every Time
A torsion spring that snaps stays on its shaft. An extension spring that snaps does not. It releases along its own length and the loose end travels. That is the entire reason a safety containment cable exists: a plain steel cable threaded down the middle of the spring and anchored at both ends, so that a broken spring stays where it was.
A fair number of the older doors we see here have no containment cable at all, either because the door predates the practice or because whoever did the last repair skipped it. If yours is missing one, we will point it out and fit it. It is a small part on a door that runs several times a day.
Pulleys, Hooks and the Hardware That Gets Reused
The springs are the expensive part, so they are the part everyone concentrates on. The small hardware around them is what tends to get reused when it should not be. The sheave pulleys at the front of each track spin every time the door moves and are exactly as old as the springs that just failed. A pulley with a worn axle or a grooved sheave will saw through a brand new cable in a season.
The same goes for the S-hooks, eye bolts and clips at the rear anchor. They are thin steel carrying constant load, they stretch, and leaving a tired one in place to hold a new spring defeats the point of the repair. When we quote extension spring work we quote the hardware that carries it, and we say which pieces are genuinely still good rather than replacing everything on reflex.
Other work we do in Arlington Heights
- Torsion Springs
- Roller Repair
- Panel Replacement
- Smart Openers
- Commercial
- Custom Doors
- Maintenance
- Safety Inspection
- Lubrication
- Spring Replacement
- Opener Repair
- Installation
- Emergency Service
- Cable Repair
- Track Repair
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More on extension spring replacement, or everything we cover in Arlington Heights.
Questions
Arlington Heights questions about this job
The springs look intact but the door is heavy. Can they fail without breaking?
Yes, and with extension springs it is the normal way they end. They do not snap so much as give up. Years of stretching leaves the steel permanently longer, so the spring no longer pulls the door back with the force it did when it was new. You can often see it with the door open: the coils should sit closed and touching along the relaxed spring, and on a spent one there are visible gaps between them.
Only one spring broke. Why replace both?
Because the other one is the same age and has done the same work. A new spring paired with a tired one pulls unevenly, which racks the door in the tracks and puts the load on one cable. You would also be booking a second visit within months. Springs are installed and replaced as a matched pair for the same reason tires are.
Is an extension spring door less safe than a torsion one?
Not inherently, as long as it has containment cables and the springs suit the door. The risk with extension springs is specifically what happens in the moment one lets go, and the containment cable exists to control exactly that. What is genuinely unsafe is an uncontained spring on a door that gets daily use.
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