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Remove the REVERSE-THREAD screw at the bottom of the chuck. Set the clutch collar to the highest setting, and set the gear to the slowest setting on the transmission. Remove the power source! Get the biggest allen wrench you can fit in the end of the chuck(the shortest leg) and tighten the chuck down around it, allowing the jaws to rest and tighten on the flats of the wrench. Lay the drill on its side(chuck toward you, handle to the left, and allen wrench to the left, horizontal to the deck. Then with a hammer(soft hammer if you care about the allen wrench) quickly and deliberately hit the allen wrench in an attempt to cause the allen wrench to spin counter clockwise. Let me know if this works for you!
Open the chuck fully. Inside the center bottom of the chuck you will normally find a reverse threaded lock screw that you must first remove. If it is hard to loosen, you may need to heat it with a micro torch or a heat gun to make the thread lock compound slip. Then fasten the smaller end of an allen key firmly into the jaws of the chuck. Engage the low gear. Then hit the longer end rapidly with a hammer to unscrew the chuck by rotating it anti clockwise.
remove the chuck retaining screw, shift the tool into the low position and the clutch into the drill only position. Find a bent handle allen wrench about the size of the chuck (bigger the better) insert short end into chuck and tighten. Put the chuck on a work bench with the long end of handle at about a 30 deg angle and hit it with a hammer. It might take a couple times but it will come off. Let me know if you need any more help, and if I have helped you would you please rate my answer accordingly