Finally figured out why my garage door felt like a 200lb deadlift

Same thing happened to my double-car Clopay door about two years ago. Heard a loud bang like a shotgun going off inside the garage at 6 AM. Tried hitting the wall button on our Chamberlain belt drive, got that exact two-inch hop and hum before the thermal overload tripped.

One thing my tech suggested that turned out to be a great move was paying a little extra to upgrade from the standard 10,000-cycle springs to 25,000-cycle oil-tempered ones. It was only about $50 more for the pair. With two teens driving and the garage basicly serving as our primary front door, we cycle that door at least eight times a day, so standard springs wear out fast. I also had him swap the rusty steel rollers for sealed 13-ball nylon ones while the tension was off the cables. Made a massive difference in how quiet the whole setup runs. You made the right call hiring it out, too—those winding cones carry way too much force to mess with unless you relly know what you're doing.

I know the prevailing wisdom is to never touch torsion springs yourself, but when the right-side spring snapped on my 16x7 Amarr door last fall, local shops wanted $480 just for a basic swap. Since things were tight, I ended up ordering a matched pair online alongside a set of solid 1/2-inch steel winding rods.

The critical step was using digital calipers to measure the wire size exactly—mine was .225 wire with a 2-inch inner diameter and 27 inches long. If you're even a fraction of an inch off on wire gauge, the door won't balance right. As long as you stay completly clear of the winding cone's line of fire, never use screwdrivers, and count your quarter-turns carefully (took me 30 quarter-turns per side), it was surprisingly manageable. While the bar was down, I also replaced the worn-out end bearing plates and threw in some sealed 13-ball nylon rollers. It completely silenced the shuddering on the tracks, and my old Genie screw drive doesn't even strain on the first six inches of travel anymore.

Did the tech actually pop the casing on the opener to check the drive gear? Have you ruled out internal gear wear from when the motor tried heaving that dead weight? Those nylon gears strip pretty easily under that kind of sudden torque. It might glide fine right now becuase the fresh springs are doing all the work, but I'd pull the motor cover and look for white plastic shavings around the sprocket. If the teeth got chewed up during those two-inch attempts, you might be dealing with a stripped gear in a month or two.

Quick update — good call on checking the drive gear. I popped the cover off my Chamberlain unit this afternoon to take a look. There’s defintely a light dusting of white plastic shavings sitting right beneath the main nylon gear. It’s running quietly now, but is some shaving normal after 13 years, or shold I go ahead and replace the gear assembly before it strips completely?