Open the chuck fully and look inside, there should be a screw there that has to be removed to remove the chuck in view of the fact that it is a reversable drill and the chuck cannot be screwed off like a conventional inudirectional drill.
Inside the chuck there should be a screw. take that out and the chuck may unscrew.if not there should be at the base of the chuck where it goes into the drill, two flat spots to put a wrench on. if you dont have a wrench that thin try to put the drill in a vise and see if you can unscrew it. the brake in the gears should keep it from turning while trying to unscrew.
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