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Guide
One kind of spring sits on a shaft above the door. The other kind runs along the tracks. Both are reasons to call, and neither is a home project.
In short. One kind of spring sits on a shaft above the door. The other kind runs along the tracks. Both are reasons to call, and neither is a home project.
A torsion spring is the coil on the shaft just above the opening. An extension spring is the long spring stretching along the horizontal track, usually with a safety cable through it. You do not need the wire size or the wind count to start the conversation.
They fail differently and they are replaced differently, but the customer-facing rule is the same: stop using the door and do not wind, stretch, or unbolt anything. A broken torsion spring often announces itself with a bang and a door that suddenly feels like its real weight. An extension spring that lets go may be hanging along the track.
The visit replaces the failed spring and balances the door so the operator is not dragging a dead weight. No rule of thumb is printed here.
The shaft spring is above the door. The track springs run along the rails toward the back of the bay.
Describe the shape and whether the door is up or down.