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An important component in the mechanical make-up of garage doors is the spring system.
Without springs the doors would not rise and fall. These components should be in good, strong working condition at all times for the doors to function properly. The counterbalance springs do the actual lifting and closing.
When the doors rise the springs unwind. This provides the necessary power to do the lifting. When the door closes, the weight of the door winds the springs back up until the door is entirely shut. At this stage the springs are fully tensed again.
The springs need to be adjusted periodically.
When the typical door weighs about three hundred pounds and involves the co-ordination of pulleys, cables and springs, this is inevitable. It is not difficult to do a cursory check up. With safety glasses on one can pull on the red emergency release cord so that the doors are opened manually. By lifting it halfway and observing if it stays in place or falls, one can determine if it is out of balance. If it falls, then it is not in balance.
There are other assessment suggestions described on the site for testing the poor performance of the doors. When the doors need [more]