After removing the screw and inserting the allen wrench shift the drill to the LOW position and turn the clutch to the drill only position. Use an allen wrench about the size of the chuck capacity so that it will not flex when hitting it with a mallet. Sometimes they are stubborn because of the torque but this should work. Put the allen wrench at about a 30deg angle and hit the wrench. I support the chuck on a workbench or a block of wood will do fine. The chuck has standard threads.
Open the chuck fully and remove the scre inside by turning clockwise. insert allen short side in to the chuck & tighten
the chuck. hold the drill & hit the allen counter clockwise & do it again as needed.
SOURCE: my chuck is broke , on my 18v makita cordless
Put the chuck key on and strike it with a hammer counter clockwise. the chuck key must be properly seated in the hole. Once the chuck is brokrn free, you can unscrew it my hand. Buy a new chuck an screw it in olace and againm strike the key but no as hard clockwise. It will self tighten more as it is used, Good Luck-Ned-
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taken out screw from inside chuck still cant remove old chuck
taken out screw from chuck still cant get old one off
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