How To Properly Tighten A Garage Door Opener Chain
If your garage door makes an excessive amount of noise while opening, one of the first things you should check is the tightness of the opener drive chain. A loose, sloppy chain will slap against the T-rail, the central beam that provides support for the door trolley, and generate lots of noise as a consequence. In addition, a loose chain can also slip off the sprocket of the opener altogether, resulting in a non-working door.