Lift Cable Repair

Garage Door Cable Repair in Toronto & the GTA

Lift cables carry the door’s weight from the bottom brackets up to the drums. When one snaps, frays, or leaves its groove, the door leans, binds, or drops on one side. We replace cables as matched pairs, reset the drums, and rebalance the system so both sides lift evenly again.

  • Snapped, frayed, and off-drum cables replaced
  • Matched pairs for even lift on both sides
  • Drums reset and door rebalanced after install
  • Aircraft-grade cable sized to your system
Request a Free Estimate Call (647) 493-9256
Close-up of garage door lift cable and roller hardware on a residential torsion system
Pair replace
cables renewed together for even lift
STOP — do not operate if a cable has snapped

Leave the door down and disconnect the opener until a technician resets the cables and balance. Operating a one-sided cable can bend tracks, crush rollers, and drop the door.

Lift Cable Path — System Map
Left Cable Drum Right Cable Drum
Aircraft Cable Lift Cable Pair
Anchor Bottom Bracket
Counterbalance Torsion Spring
How the System Works

The Cable Path From Bracket to Drum

On a torsion system, each lift cable starts at a bottom corner bracket, runs up beside the vertical track, and wraps onto a cable drum at the end of the torsion shaft. When the spring unwinds during opening, the shaft turns the drums, and the cables wind in — lifting both sides of the door together.

That relationship means a cable problem is rarely only about the wire. A cracked drum groove can chew a new cable. A weak or broken spring can overload one side until the strand fails. An off-track door often follows a cable that slipped or snapped mid-cycle. Our technicians trace the full path before they cut any wire.

Understanding the path also explains why DIY “stringing” attempts go wrong. The cable must seat in the drum groove at the correct starting wind, with equal free length on both sides, before spring tension is restored. A few millimetres of mismatch shows up as a crooked door on the next open cycle.

Drum repair → Spring replacement → Off-track repair →
Read the Door

Symptom → Likely Cable Cause

Match what you see to the failure mode. Each cell links to the service or guide that covers the next step.

Crooked door One cable stretched, frayed, or shorter than its partner — door rides high on one side. Crooked door guide → Slack cable hanging Cable left the drum groove or slipped the bottom bracket ferrule. Do not pull it by hand under tension. Cable came off guide → Door off one side Snapped cable let rollers leave the track on the unsupported side. Stop the opener. Off-track repair → Grinding at drum Cable climbing the flange or rubbing a scored drum groove — wire strands shred with every cycle. Drum repair → Cable off drum Loose set screw or uneven spring wind dumped the wrap. Cable sits beside the drum, not in the spiral. Reseating guide → Door heavy one side Often a spring or cable imbalance — one side carries more load until the weaker cable fails. Spring service →
Failure Modes

Why Garage Door Lift Cables Fail

Three tall patterns show up again and again on GTA service calls — especially after freeze–thaw winters.

Frayed garage door lift cable with broken strands near the cable drum
01

Wear and Fray

Aircraft cable is made of many thin wires twisted into strands. Each open–close cycle bends those wires around the drum. Over years — often 7,000 to 15,000 cycles on a busy household door — outer wires nick, rust, and break. Once a few strands open, the remaining wires carry more load and the failure accelerates.

Road salt tracked into the garage, condensation on uninsulated doors, and dry winters without lubrication all speed corrosion. A cable that looks “fine” from across the room can show broken wires if you inspect the drum wrap and the bottom few feet near the bracket.

02

Spring Imbalance

Springs do the heavy lifting. Cables only transfer that force to the door corners. When one torsion spring weakens, breaks, or is wound incorrectly, one cable takes a larger share of the door weight. That overloaded side stretches, climbs the drum, or snaps while the other cable still looks usable.

This is why a cable repair visit always includes a spring check and a balance test. Replacing wire without correcting spring tension puts the new pair under the same uneven load. Related reading: spring replacement and door balance service.

03

Drum Set-Screw Failure

Each cable drum locks to the torsion shaft with set screws. Vibration and temperature swings can loosen those screws. When a drum slips, the cable loses its timed wrap — it may jump the groove, bind against the end bearing plate, or unwind on one side only. The door then racks hard enough to bend track or pull rollers free.

Damaged drums with sharp groove edges will cut a new cable within weeks. We replace scored drums during the same visit when needed — see drum repair for how that part of the job works.

Field Protocol

How We Repair Lift Cables — Five Steps

Cable work is precision work under stored spring energy. The sequence below is the controlled method our licensed technicians follow on residential doors across Vaughan, Toronto, and the surrounding GTA. Skipping a step is how doors get twisted and openers get stripped.

Cable Repair Protocol Matched pair · balanced finish
1

Clamp the door

Vice grips or door locks hold the door closed so it cannot rise when spring tension is released.

2

Release tension safely

Winding bars unwind the torsion spring in controlled turns. Never use pliers or screwdrivers in the winding cone.

3

Replace cables as a pair

Both sides get new aircraft-grade cable sized to the door. Old stretch and wear are removed together.

4

Reset the drums

Cables seat in the drum grooves, set screws are torqued, and starting winds are matched left to right.

5

Balance test

Spring tension is restored, the door is tested at mid-travel by hand, then opener force and sensors are verified.

Hardware Specs

Aircraft Cable Specifications We Install

Not all “garage door cable” sold online matches the door’s weight or drum groove. Here is the sheet we work from.

Lift Cable Spec Sheet

Residential torsion systems
Strand construction
7×19 aircraft cable — seven strands of nineteen wires each. Flexible enough to wrap drums repeatedly without the stiffness of 7×7 cable used on lighter hardware.
Common diameters
1/8 inch for most single and standard double residential doors. 3/32 inch appears on lighter builder doors and some older extension-spring systems. Diameter must match the drum groove; the wrong size climbs or binds.
Breaking strength
Properly rated 1/8" 7×19 galvanized aircraft cable carries several thousand pounds of breaking strength — far above the static door weight — because dynamic loads spike when the door starts, stops, or hits an obstruction. We size cable to the manufacturer’s drum and door weight, not to a guess.
Finish & fittings
Galvanized wire resists GTA moisture better than bare steel. Factory or swaged stop fittings at the drum end, and secure retention at the bottom bracket, keep the cable from pulling through under load.
Why matched pairs
Both cables stretch and fatigue together. A new cable paired with an old one creates different stretch rates, uneven drum timing, and a crooked door within months. Safety-matched pairs keep left and right lift equal from day one.

Extension-spring doors use cables differently — often with pulleys and stretch cables — but the same rule applies: replace both sides, verify spring safety cables, and test balance before reconnecting the opener.

Cable Work Is Not a DIY Job

Lift cables sit in a system that stores hundreds of pounds of spring force. Releasing that force without winding bars, door clamps, and the correct cable size can cause the shaft to spin freely, the door to drop, or a winding cone to strike with enough energy to cause serious injury. Online videos that show “simple” restringing often skip the parts that go wrong on real doors with worn drums and uneven springs.

If a cable has already snapped or come off the drum, stop using the door and do not operate the opener. Keep children and pets away from the opening. Our homeowner guides explain what you can safely observe from a distance and what to leave alone.

Garage door safety check → Cable came off the drum →
Pricing Clarity

Cost and What to Expect on the Visit

For a typical residential double door, replacing a matched pair of lift cables usually falls between $150 and $250, parts and labour included. That range covers standard 1/8" cable on a torsion system where the drums and springs are still in serviceable condition.

The total can move higher if a drum is scored and must be replaced, if a spring has also failed, or if the door is a heavy insulated or wood model that needs larger hardware. Extension-spring systems with pulleys and stretch cables are quoted after inspection because the layout differs from torsion drums.

When you call or send the form, describe what you see: a hanging cable, a crooked panel, a grinding sound at the shaft. That detail helps the technician load the right cable diameter and spare drums. On arrival you receive a written estimate. Work starts only after you approve the scope. Most pair replacements finish during the same appointment, followed by a mid-travel balance check and an opener safety reverse test.

Upright Garage Doors & Springs is family-owned, licensed, and insured, based in Vaughan and serving homes across Toronto, York, Peel, Halton, and Durham. Hours run Sunday through Thursday 8am–10pm, Friday 8am–4pm, Saturday closed.

Cable Questions

Garage Door Cable Repair FAQ

Answers specific to lift cables — not generic spring or opener questions.

A typical lift cable replacement for a residential double door runs between $150 and $250 for a matched pair, parts and labour included. Heavier insulated doors, damaged drums, or related spring work can raise the total. Every job starts with a written on-site estimate before work begins.
Both cables carry the same load and age at the same rate. Replacing only the broken side leaves a worn partner that often fails soon after. Installing a matched pair keeps drum timing and door balance even across both sides — the same logic that applies to replacing torsion springs as a set.
No. Stop using the door and do not operate the opener. A snapped cable leaves one side unsupported. Running the motor can twist panels, pull rollers out of the track, and damage drums or springs. Keep the door closed until a technician resets the system. See our cable came off guide for what to check from a safe distance.
The most common causes are normal wear over thousands of cycles, spring imbalance that overloads one cable, and drum set screws that loosen so the cable climbs the drum flange. GTA winters add corrosion and brittle wire from freeze–thaw moisture. Annual maintenance catches fraying before a full break.
Cable work sits under spring tension. Releasing or winding that system without winding bars and door clamps can cause serious injury. Homeowners should not attempt DIY cable replacement. Call a licensed technician who carries the correct aircraft-grade cable and tools. Our safety check guide covers homeowner-safe inspections only.
Most cable pair replacements finish in about one to two hours once the technician arrives, provided drums and springs are in usable condition. If a drum is cracked or a spring has also failed, those parts are replaced during the same visit when stocked on the truck. You approve any added scope before it starts.
Local Coverage

Cable Repair Across the GTA

City pages for lift cable repair near you, plus the full service-area map.

Ajax Brampton Burlington Etobicoke Markham Milton Mississauga North York Oakville Oshawa Richmond Hill Scarborough Toronto Vaughan All Service Areas →
Keep Reading

Related Services & Guides

Spring Replacement

Weak or broken springs overload cables. Matched high-cycle springs restore proper counterbalance.

View spring service →

Off-Track Repair

A snapped cable often pulls rollers free of the track. We reseat sections and correct the root cause.

View off-track service →

Guide: Cable Came Off

What a cable off the drum looks like, what not to touch, and how to prepare for the repair visit.

Read the guide →

Need Lift Cables Replaced?

Tell us what the door is doing — hanging cable, crooked panel, grinding at the drum — and we will schedule a licensed technician with the right cable size on the truck. Estimates are written before work starts.

(647) 493-9256

Sun–Thu 8am–10pm · Fri 8am–4pm · Sat closed · [email protected]

Request a Cable Repair Estimate

No obligation — we review your note and call you back.