One thing that sometimes works is to try to "tighted " the chuck onto the shaft a little. Sometimes the chuck backs off a bit and puts alot of pressure onto to screw, by trying to tighten the chuck down a bit first it will release some of the pressure on the screw. Since yuor chuck is jammed try this.... Put the drill into "low" gear( #1) then make sure the clutch setting is all the way into drill mode. Clamp the chuck assembly itself into a large vise with the drill body sticking straight up and try turning clockwise very sharply and hard (trying to tighten the chuck down ). Remove the drill and try again to remove the screw ( which on the dewalt is a torx size t-20 and left hand thred (clockwise to remove). Once the screw is out try the same method to remove the chuck. Clamp the chuck tightly into a vise and give it a hard sharp snapcounter clockwise to remove. ..... Good luck and let us know how you made out
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