There is a torx headed screw inside the chuck that is reverse thread (Right hand to loosen) - remove that then the chuck will spin off standard thread (Left hand loosen)
Most of the time I chuck a 1/2" allen wrench into the chuck, mount the drill in a vise, and strike the wrench with a hammer to get the chuck off
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: the chuck is stuck on 18 volt dewalt drill
It is not the chuck that is stuck, it is probably the armature. Probably a problem with the brushes. Since it is so easy I would try first unscrewing the caps and pulling the brushes out to see if things spin then. If the brush will not come out then it is probably jambed and you would have to take the drill apart. If you take the brushes out and still have a problem, at least one reasonable but simply checked problem is eliminated.
SOURCE: removing the dewalt DC925 'rohm' chuck
I have a DC927 and a DC926 that I removed 1/2" Rohm Supra SK key-less chucks on. This process is pretty simple. Put the drill motor in 1st gear. Put the clutch ring in drill mode and not in driver or hammer. Reverse or open the chuck all the way. Hold the chuck firmly in a vise and give the drill a good POP counter clockwise. The last step can also be done with a pipe wrench by placing the drill on a work bench and turning the chuck counter clockwise. Continue to un-thread until the chuck is removed. The replacement chuck must have the same mounting process and mechanism. Put a few drops of locktite on the threads and thread the replacement chuck back on. Tighten the chuck using the vise or pipe wrench. Place the short end of an allen wrench in the chuck and tighten down on it. Placing the drill on a work bench, strike the allen wrench with a mallet to finish tightening and locking down the chuck. Congratulations, you have just changed out your chuck.
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