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Two detached extension springs with hooked ends on a garage bench. — Extension Spring Replacement, Dunedin

Springs · Dunedin

Extension Spring Replacement in Dunedin

You pulled the red cord to open the door during a power cut and it barely moved. Lifting it took your whole weight, and when you let go it came down hard.

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Extension Spring Replacement

In plain words

When one extension spring breaks, the other is replaced with it. The two springs were fitted together, have stretched the same number of times and have rusted in the same air, so the survivor is near the end of its life. More importantly, a door balances only when both sides pull equally; a new spring paired with a tired one lifts one corner ahead of the other and twists the door. Fitting a matched pair rated for the door's weight lets the technician set both sides to the same hook position and hand back a door that rises level and holds where it is left.

Sound familiar?

It is the first hard frost of the year and the door on the old detached garage has stopped halfway, squealing at one pulley. The springs are the ones that came with the door decades ago, orange with rust where they hang near the back wall.

How the visit goes

Dunedin

How the visit goes

  1. Securing the door with the springs slack

    An extension spring is stretched tight when the door is closed and nearly relaxed when the door is fully open, so the first move is to get the door up. The technician pulls the opener's release, raises the door by hand if it will go, and clamps both vertical tracks below the bottom rollers so the door cannot come down. If a broken spring has left the door stuck partway, it is lifted and supported with the weight taken on clamps and props before anything else is handled. With the door held open, the springs, pulleys and hooks can be examined and removed like ordinary hardware, which is the whole reason the sequence begins this way.

  2. Fitting a pair that matches the door

    The new springs are selected from the door's measured weight and its height, which together give the rating and the stretched length required, and they are fitted as a pair even if one old spring looked sound. The technician checks each new spring's wire size, coil diameter and relaxed length against the specification before it goes up, and confirms the end loops suit the hanger and the pulley fork. The rear loop is hung on the hanger and the front loop takes the pulley fork. On heavier doors that carry two springs per side, all four are renewed together. Nothing is hooked to the door yet; the springs simply hang in place, slack, waiting for the cables.

  3. A door that lifts as it was designed to

    The difference is felt the first time you pull the release cord and lift the door yourself. It rises with one hand, pauses where you leave it, and comes down at the speed you lower it rather than dropping the last stretch. Under power, the opener runs without the strain in its note that had crept in as the old springs tired, and the door reaches the floor evenly along the seal. Both springs now stretch to the same length as the door closes, both pulleys turn without a squeal, and the cables lie in their grooves. A door in this condition puts little wear on the opener, which is good news for the motor.

Extension Spring Replacement

In the van

  • Containment (safety) cables
  • Lag screws and hanger bolts
  • Replacement rollers and hinges
  • Garage-door spray lubricant
  • Lift cables

What affects the quote

Same fees day, night or weekend

  1. 1Pulleys that need renewing

    Each side has two pulleys, and a wheel worn to a groove or a bearing that has stiffened is replaced with the springs. The quote names how many and which type.

  2. 2One spring per side or two

    Heavier doors sometimes carry a pair of springs on each side rather than one. Four springs, four containment cables and the extra setting time show as their own lines.

  3. 3Converting to torsion instead

    Where the garage has the headroom, some owners take the opportunity to move to a torsion system. That is a different job with different hardware and is quoted as its own option.

What to have ready

0 of 3 ready

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Extension Spring Replacement: questions

What are the early signs that the springs are wearing out?

The door starts to feel heavier when lifted by hand and the opener sounds as though it is working harder. Released from the opener, the door sinks from halfway instead of holding. With the door open, gaps show between coils that used to sit tight together, or one spring hangs longer than the other. Rust bloom on the coils and a squeal from a pulley round out the list. Any of these is a good time to call.

What does the paint colour on the end of the spring mean?

Manufacturers dab a colour on the end coil to indicate the spring's weight rating, which is a handy starting point. It is not the final word: a faded or repainted end coil tells you little, and the pair on an older door may have been a near match rather than the right one. The technician treats the colour as a hint and confirms the rating from the door's measured weight and the spring's own dimensions.

Can I use the door as soon as the work is done?

Yes. The last steps of the visit are the balance test by hand, several full cycles under power and the opener's reversal checks, so the door is ready for normal use when the technician leaves. New springs need no settling period. It is worth running it yourself once or twice while the technician is still there, so you know what a properly balanced door sounds and feels like from now on.

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Extension Spring Replacement near you

Garage door work for Dunedin divides neatly into what we fix, what we replace and what we install. We fix tracks, hinges, openers and panels; we replace springs, cables, rollers, seals and sensors; and we install new doors, new openers and access equipment such as keypads and smart controllers.

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