Springs · Strathroy-Caradoc
Garage Door Cable Replacement
Someone left the snow shovel leaning in the opening and the door came down on it.
In plain words
Cables are replaced as a pair, and there is a practical reason. Both went on the door together, have made the same number of trips and have sat in the same slush, so when one fails the other is close behind. A new cable beside a stretched one also pulls the door slightly out of level. Fitting two matched cables of the same length and construction lets the technician set the door dead level, tension both sides equally and leave a counterbalance that shares the work evenly for years. It also means one visit rather than two.
How the visit goesThere was a sharp crack from the garage, and when you went to look the door had dropped on one side and jammed. A length of cable lies coiled on the floor by the bottom roller.
Garage Door Cable Replacement
How the visit goes
Both cables, side by side
Both cables are examined even when only one has failed, because they are the same age and have made the same trips. The technician looks along each for broken wires, thinning near the bottom loop, rust bloom, kinks, and flattened spots where the cable has rubbed. The ends get particular attention: the swaged stop that seats in the drum and the loop or ferrule that rides on the bottom bracket pin. The two are compared for length as well, since a stretched or slipped cable shows as one corner of the door sitting higher. This comparison decides what is fitted and explains any crookedness you have noticed.
Setting the door level
Before any spring tension returns, both cables are brought to the same tension. The technician rotates each drum until the slack is gone and the cable is snug in its groove, then tightens the set screws onto the shaft, often onto a small flat so the drum cannot creep. A level on the top section confirms the door sits square in the opening, and the gap under the bottom seal is checked along its length. If one corner sits high, the drum on that side is eased and reset. This is the moment that decides whether the door will run straight for years, so it is not hurried.
A door that runs level and quiet
The first thing you notice is a door that rises squarely, with both bottom corners leaving the floor together and the top section staying flat as it turns into the horizontal track. The bottom seal meets the slab along its whole length, so the draft and the strip of daylight at one corner are gone. The opener sounds calmer, because it is moving a balanced door rather than dragging a crooked one, and it stops reversing for no apparent reason. If you lift the door by hand with the opener released, it moves with light effort and holds where you leave it. That is what a correctly cabled door feels like.
Garage Door Cable Replacement
In the van
Drum set screws
Bottom brackets with cable pin
Silicone garage-door lubricant
Clevis pins and cotter pins
Winding bars
Garage Door Cable Replacement
What affects the quote
How the door is sitting
A door resting closed is simpler than one wedged crooked in the opening or off its track, which has to be supported and straightened before the cables can be handled.
Opener adjustment afterwards
A newly balanced door often needs the opener's travel limits and force settings reset and its reversing tested. That short adjustment is named in the quote when it is needed.
Drums that need replacing
Worn grooves, a cracked slot or a drum that has spun on the shaft mean a new pair of drums, which adds parts and a little time to the same visit.
What to have ready
- Is the door closed, fully open, or stuck partway?
- Do you have the door's manual or a label showing the model?
- Is there rust on the cables or brackets near the floor?
Garage Door Cable Replacement: questions
QuestionsWhat information helps when I call?
Whether the door is sitting crooked, jammed partway or on the floor; whether you can see a cable hanging loose, frayed or wrapped around the shaft; whether there is a spring above the door or springs along the tracks; the door's rough height and whether it is a single or double; and what happened just before, such as the door coming down on something. A photo of the drum end and the bottom corner is useful.
How do I tell a cable problem from a spring problem?
Look above the door with it closed. A torsion spring that has broken shows a clear gap in the coil, and both cables usually go slack together because nothing is turning the shaft. A cable problem tends to show on one side only: a frayed length, a coil of loose cable, or one corner sitting higher. Either way the technician inspects both, since a weak spring is a common reason a cable fails.
Should both cables be replaced when only one has failed?
Yes, as a rule. The two cables were fitted together, have flexed around their drums the same number of times and have sat in the same slush, so the survivor is close to the end of its life. A new cable beside a stretched one also makes it harder to set the door level. Two matched cables give an even lift and one visit instead of two.
Related services
- Garage Door Hinge ReplacementWatching from inside as the door opens, you can see the gap between the second and third panels open up on one side as they turn the corner into the ceiling, then close again.
- Garage Door Track Repair or ReplacementThe horizontal rail toward the back of the garage sags noticeably.
- Torsion Spring ReplacementAfter pulling the red release cord, you tried lifting the door yourself and it would barely leave the floor.