Lay the chain on the garage floor while you complete the repair.
Garage door chain sprocket replacement.
Simply remove those for replacement.
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This gear and sprocket assembly is compatible with various chain drive garage door openers.
041c4220a is a complete chain drive gear and sprocket replacement kit.
Remove the outer nut and lock washer from the trolley threaded shaft and pull the threaded shaft out of the trolley.
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If it is the entire assembly you need just replace the assembly with your new one.
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Pull the chain off the motor unit sprocket and out of the chain spreader.
Helical gear and top hat assembly worm gear wear bushings grease and hardware needed to replace the chain drive gears.
Slide the outer trolley away from the inner trolley.
Genuine genie replacement belt and chain drive sprockets main drive gears and more.
If it is just a gear you are replacing you should remove it after you have unbolted assembly and replace it with a new one by going in reverse order.