HOW THE SPRING SYSTEM WORKS
What the Spring Actually Does.
The spring does the heavy lifting before the opener ever starts moving the door.
A properly balanced door should feel controlled — not dead heavy.
The spring system counterbalances the weight of the garage door so the door can move
smoothly without forcing the opener to lift the full weight on its own.
When the spring is working correctly, the door should feel controlled and relatively
easy to move. When a spring breaks, that balance disappears and the door can suddenly
feel extremely heavy.
That is also why a broken spring can sometimes look like an opener problem. The opener
may strain, stop, or only move the door a short distance because the spring is no longer
carrying its share of the load.
SPRING
Counterbalances the door.
OPENER
Moves the balanced door.