My solution when the other mentioned ideas didn't work was this: I removed the 7 Torx #20 screws ( a common screw driver will work as well) and removed the housing half to expose the shaft. The chuck shaft bearings and gear lifts out as one assembly. Directly behind the chuck there is a half inch section of shaft exposed. I mounted a vise grip on the shaft (won't hurt it) and clamped the affair in a bench vise. With a 5/16" allen wrench mounted in the chuck and using a mallet I spun the chuck off with a solid smack counter clockwise . Very simple and easy .
SOURCE: Dewalt XRP Drill Chuck will not come off
you need a special jig to remove the chuck on this kind of drill
SOURCE: got a broken drill chuck i cant get off (Dewalt)
first remove the chuck retaining screw LH thread, next shift the tool to the drill only position and the low side. Find a bent handle allen wrench and insert the short piece into the chuck and clamp down, place the chuck with the long portion at about a 30 degree so you can strike it counter clockwise, usually a block of wood or work bench will do and then get a hammer and safety glasses and hit it, it might take a couple times but it will come off
SOURCE: removing the dewalt DC925 'rohm' chuck
I simply placed the chuck into a large vise and turned the drill counter clockwise and the chuck spun right off no problem without damaging anything!! It does have some thread lock on the chuck but just use your man strength and its as simple as turning the lid off the pickle jar! Do not waste your time or money with the removal tool...YOU DONT NEED IT!
SOURCE: Dewalt dw106 drill - keyless chuck will not close.
Go to this LINK and find the part/diagram that can help you.
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