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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. Remove the battery! 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, and if not, explain what is happening.
Usually: there is a screw inside the chuck with reversal thread. Unscrew it in clockwise direction. Once done, lock bigger allen wrench into chuck and hit the wrench with rubber hammer in counter clockwise direction. If your drill does not have spindle lock you can use Open Ended Wrench (between chuck and body) to lock spindle and then hit the allen wrench.Regards, Juraj
Do the same in reverse, if possible. Also, you could use two channel locks as most of those chucks have two rings, the narrow one towards the drill itself being attached to the motor. However, make sure the screw inside the chuck is tight first -- I've seen those back out and block chucks open.
if the chuck is rusted start with some WD-40 on the chuck body. Then what I would do is take a rag and wrap around the chuck collar and using a pair of channel locks grip the collar with enough pressure to hold but not break it and using the tool in the low position pull the trigger switch SLOWLY and see if that doesn't free up the chuck. Let me know if still stuck and I will come up with something else, but this usually works for me.
I just changed the chuck on my 18 volt xrp half inch hammer drill,yes first you must remove the torx screw with #15 torx bit,note this is a left handed thread screw,knowing the bad chuck was bad I added some heat from a propane torch to the chuck then making sure it was in 1st gear i took some vise grips and the chuck is screwed on with normal right handed threads,it broke loose (was stubborn but needs a lot of torque )ahhhhhh wat a pain.