Water displacing penetrating oils (such as WD-40) will soften plastic, nylon or rubber components, which is especially bad if you have nylon rollers. The spray can also damage a garage door's powder coat finish. Aug 3, 2022
If your garage door starts opening and closing much slower than it did when you first got it or the reaction is extremely delayed, it might mean you need a replacement. Noise level: Sometimes increased noise can just mean a certain component needs a repair or replacement. However, noise shouldn't be ignored. Jan 15, 2018
If it's higher than four feet off the ground, or lower than three feet, you'll know it needs to be realigned. Use a ladder as a brace to keep the door safely open while you're working on it. This also takes the pressure off the springs so you can inspect them for rust and warping.