How to remove chuck from Dewalt Hammer drill?

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How to remove chuck from Dewalt Hammer drill?

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How do I get off a keyed chuck from a Dewalt Hammer Drill, Model #DW505? I removed the 3 screws from the top portion of the drill. I can see the gears, but I can’t seem to figure out how to remove the chuck (the part at the very tip of the drill). It won’t open or close when you use the key. Thank you.