Simply remove those for replacement.
Garage door chain sprocket replacement.
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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.
Genuine genie replacement belt and chain drive sprockets main drive gears and more.
Replacement gears and sprockets for genie model garage door openers.
Remove the outer nut and lock washer from the trolley threaded shaft and pull the threaded shaft out of the trolley.
041c4220a is a complete chain drive gear and sprocket replacement kit.
Lay the chain on the garage floor while you complete the repair.
Helical gear and top hat assembly worm gear wear bushings grease and hardware needed to replace the chain drive gears.
See full descriptions for garage door opener compatibility by model numbers.
This gear kit on amazon.
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If yours is a belt drive you need a kit like this https amzn to 2zqns.
If it is the entire assembly you need just replace the assembly with your new one.
Pull the chain off the motor unit sprocket and out of the chain spreader.