If your door will not open, feels heavy, or slams down the instant you lift the panel, the spring is the first thing to check — but it is not automatically the only thing. Worn cables, a damaged roller, or a dented track can all mimic a spring failure. We test before we replace.
How garage door springs actually fail
A garage door is held up by counterbalance, not by the opener. The springs store the energy that offsets the weight of the door, and the cables transfer that energy to the door through the drums at the top of the tracks.
Two systems are common in Bell Gardens:
- Torsion springs sit horizontally above the door, usually on a centre bearing plate. They twist to lift the door. You can see them from inside the garage looking up at the header.
- Extension springs run along the ceiling on either side, hooked to a cable that runs down to the bottom corner of the door. Older doors, and many doors from before the late 1980s, use this layout.
Torsion springs are wound with stored energy — a broken one can whip across the ceiling. Extension springs under tension can snap back hard enough to injure. Neither is a do-it-yourself job, and neither is a reason to keep operating the door.
Signs the spring is what failed
- The door will not lift off the floor at all when the opener is commanded.
- The door moves by hand but feels noticeably heavier or lighter than it used to.
- You hear a loud snap, bang, or crack from above the door or near the ceiling.
- One spring has visibly separated, uncoiled, or dropped while the other still looks intact.
- The door slams shut from a few inches rather than drifting down slowly.
- Red, white, or yellow paint marks on the cone of a torsion spring have closed the gap or started to overlap.
What the spring job actually involves
Replacing springs is not a single-part swap, and this is where a lot of doors get half-fixed.
- Identify the system and the size. Torsion or extension, single or double, and the wire size and drum diameter. Spring sizing depends on door height, weight, track radius and the number of drums.
- Check what else failed. Cables stretch, bottom brackets wear, drums groove, and centre bearings dry out. A new spring pushing against a frayed cable is a safety problem on its own.
- Replace in matched pairs. Springs of the same size installed together balance evenly and wear at the same rate. One new spring on one old one is a repeat failure waiting to happen.
- Re-balance and force-test. Wind or tension to the correct setting, then verify the door holds its weight through its full travel, holds at the floor when the opener is off, and stops cleanly at the top.
For torsion conversions — fitting torsion springs to a door that originally had extension springs — the conversion kit has to match the door. It is a larger job, and we will tell you up front if that is the situation.
Extension springs vs torsion springs
| Factor | Extension springs | Torsion springs |
|---|---|---|
| Where they sit | Along the ceiling, left and right | Above the door, on the header |
| How they store energy | Straight tension on a cable | Twist around a shaft |
| Common age | Older doors, frequently pre-1980s | Most doors from the late 1980s onward |
| At the bottom corner | Cable terminates in a bottom bracket | Usually no cable; weight carried by the centre bearing plate and rollers |
| If it breaks | Snaps back hard, can strike the ceiling and walls | Whips across the ceiling; a broken drum can drop the door |
Do not assume which system you have from the outside. The quickest way to tell is to look up from inside the garage: springs running lengthwise along the ceiling are extension springs; a horizontal assembly on a shaft above the opener is torsion.
When to repair and when to replace
Springs are consumables. If a spring has already been replaced once with a lower-rated or mismatched unit, and now the door is heavy again, the underlying problem is rarely the spring — it is the rating.
We replace springs rather than “repair” them, because a spring that has failed structurally cannot be restored. The genuine repair-vs-replace question is usually about the door as a whole, and it comes down to:
- Is the opener drum grooved or cracked? Drums are replaced alongside the spring, not reused.
- Are the cables frayed at the drum or at the bottom bracket? Replace them with the spring, every time.
- Is the frame warped, or are the tracks rusted through or bent? A new spring will not fix a bent track.
- Is the door heavy, hollow, and the source of the problem? Then a new door is a conversation, not a spring job.
More on the decision itself in repair or replace your garage door.
Related services & problems
These come up often alongside the work described above.