As mentioned in issue #2, garage doors are designed with a reversing mechanism that prevents them from crushing objects in their path. If you find that your garage door closes part way and then goes back up, this can be triggered by objects on the ground blocking their path such as garbage cans or toys. It could also be caused by a buildup of debris on the tracks that prevents the rollers from moving forward. This could include small items like rocks, gum or mud buildup. If the door hits even a small object on the track, it will go back up to avoid crushing whatever is underneath it.
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• Extension springs: Garage door extension springs stretch to provide lifting power for the door. These springs are typically made of steel and mounted above the horizontal track of the garage door. A safety cable should run through your extension springs to prevent possible injuries or property damage. Extension springs are the most common type of garage door spring for residential use and can break after excessive usage.