Can't remove the chuck on a drill.

Open the chuck as wide as it will open and look inside to see what type of screw/bolt it uses then using the correct tool insert it into the chuck and undo the bolt/screw, usually it will have a left hand thread so to unscrew it needs to be rotated in a clockwise directions, hold the chuck tightly but dont use excessive force if this does not work then try unscrewing it in the opposite direction, at all times be firm but like I mentioned earlier dont use excessive force.

screw in the chuck great 10 or 13 mm allen key short end in chuck and counter clockwise (but remember of the screw in the chuck if there is one (cometimes ) remove this screw clockwise but the chuck after that counterclockwise and in case there is no screw then make a little bit warm because of locktite on the threaded spindle can be used. the fixation of the spindle is the point about how to fix it so thats give no problem thats not to say by Black &decker machines because of the quality .
a blow with the hammer on the long end of the Allen key while the machine is in 1st gear or the long end in a bench -vise (short end of it in the chuck and rotate and turn on the machine to left.
More possibilities with a possibillity to fixated the spindle with a wrench in a bench -vise if there is an option to.

I have instructions in the tip section that might help. There is usually not much difference in the removal of a corded or cordless drill. Let me know if you need more assistance.

There is an 2 types of chuck ether it is an screw type or not..If your drill chuck is an screw type it is easy to remove if it is not you must have a special tools to remove it.

Look at the three jaws in the chuck,if on is further out than the others the you need to tap ti back into place with a small punch and a hammer.If this does not work then you need to replace the chuck,remove the screw at the bottom of the chuck[where you put the bit],then you will need to to clamp vise grip on the chuck and with it pointed away from you hit the vise grips with a hammer with a sharp blow downward and it should come off.Hope this helps.

You need to open the chuck and remove the bolt from the bottom of it[usually a #2 phillips].The next step is to insert a 5/16 allen wrench into the chuck and tighten the chuck.Hold the drill with the chuck facing away from you then strike the allen wrench with a hammer on the right side[so it goes down] and now you will be able to remove it by hand,good luck.

open the chuck all the way then look in and you will see the head of a screw take that out .
then you need to hold the arbor some how so you can un screw the chuck from the shaft.

remove the chuck retaining screw LH thread, and then find a bent handle allen wrench about the chuck capacity and insert the shorter piece in the jaws and tighten, Shift the tool to the low position (if it has one) and the selector to drill only (if it has one) position the chuck on a block of wood at about a 30 degree angle so you can strike it counter clockwise and hit it with a hammer, it might take a couple times but it will come off. Reinstall in reverse order,