The springs are an extremely important part of the garage door set up. They operate the movement of lifting the heavy garage door. If the springs are not tensioned correctly they can burn out the garage door motor and also cause the door to slam shut with potential cause for injury. The servicing or replacement of garage door springs requires an experienced and professional technician and should not be attempted by a homeowner. Springs will generally have a lifespan of 8-10 years if well maintained.