10 test your opener without the chain on it make sure the garage door is closed that the chain is engaged with it and that the sprocket has turned to the closed position usually after it has turned clockwise if looking at it from above.
Liftmaster garage door opener broken sprocket and gear assembly.
I noticed the opener straining a bit and it took me a short amount of time to see the problem.
Only 1 left in stock order soon.
This tensioner should be up near your garage door.
Chamberlain 41c4220a garage door opener gear and sprocket assembly genuine original equipment manufacturer oem part 4 8 out of 5 stars 150.
Keep your garage door opener up and running using garage door opener gear kits from liftmaster.
Helical gear and top hat assembly worm gear wear bushings grease and hardware needed to replace the chain drive gears.
041c4220a is a complete chain drive gear and sprocket replacement kit.
All of our garage door opener gear kits include helical gear and top hat assembly worm gear wear bushings grease and hardware needed to replace the dual speed sprocket and gears.