Overhead garage doors weigh hundreds of pounds, and doors that are not properly maintained or which are equipped with older automatic garage door openers can be safety time bombs. All too common are the tragic stories of garage doors injuring or even killing children or pets who found themselves underneath a closing door. Modern automatic door openers with auto-stop and auto-reverse mechanisms have greatly reduced such accidents, but mishaps can still occur if the door and door opener are not properly maintained.
Install the center bearing and the right spring, then secure the cones. Slide the torsion bar to the left then add the center bearing. Slide the right spring onto the bar and press the bearing into the stationary cone. Connect both of the stationary cones to the center bracket with the nuts and bolts you removed previously. Remove the locking pliers or clamp from the center bracket.[10]

The two main garage door operating mechanisms are sectional roll-ups or tilt-ups. Garage door repair services can fix single-car, double-car or RV-height doors. Your garage door may be made of wood, steel, aluminum, masonite, vinyl, fiberglass or another material. The type of garage door repair you need really depends on the type of garage door you have and the issue at hand. Garage door repair pros often charge a flat service call fee to diagnose the problem and provide an estimate. For customers who choose to have the repair done, the service call fee may be applied to the first hour of labor (including time to make the diagnosis). If your garage door is under warranty, the repair may be free of charge.
Lower the door and dismantle it by removing the hardware. Lower a double door by recruiting at least two helpers to help with the weight, and place a 2×4 block under the door to prevent smashing a foot or finger when it’s lowered. Remove the sections one at a time by disconnecting the rollers and brackets. If you have windows, tape them to help control flying shards if they break. Then remove the old roller tracks and remaining hardware.
When you hire a professional, the first thing they will do is turn off the power as a safety precaution.  They will then measure the existing door springs to make sure the new springs they order or have in stock fit accordingly.  With these new springs, they will unwind the existing springs and install the new ones in its place, tightening them with screws.  When tightened, the springs will be balanced, lubricated and the springs will be wound up.  Lastly, the door will be tested and the tracks will be lubricated to move efficiently. https://youtube.com/watch?feature=youtu.be&v=Z_eZc-kh40c
The spring system opens and supports the garage door. These springs are under heavy force, which allows the door to bounce back open and avoids overburdening the garage door opener with the entire weight load. If these springs are stuck or broken, the whole system is affected. Start by lubricating the springs with non-silicon-based lubricant. If this fails, disconnect the garage door opener from the garage door to manually open the door. If you experience significant resistance, the springs might need to be replaced; a job that requires a professional.
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