My black and decker 12v drill is 'locked". The area where you put the drill bits in won't loosen or tighten so it won't hold any bits. I have tried to manually loosen or tighten it too but nothing budges.

The chuck will not turn. So to loosen just turn the black plastic counter clockwise. The chuck will loosen. Or you can hold the black part on the chuck tight and put the drill in reverse and slowly squeeze the trigger and the chuck will loosen also. Do the opposite to put a new bit in. Put the drill in forward and hold the black part of the chuck and squeeze the trigger with the bit in place and it will tighten down on the bit.

They don't have an instruction manual online at the Black and Decker support site, but if you want a look at the exploded diagram, it's here.

Basically there's a collet nut that gets tightened down to hold the bit in place. You've got to loosen it up and you'll be able to pop bits in and out. You've got to have some way to lock the shaft while you're doing this though.

Most modern routers have a spring loaded shaft lock button. While you're holding it in, start turning the collet. When the shaft gets to the point where there's a little hole for the spring lock, you'll probably hear a little click, and the shaft will be locked so you can loosen the collet. If you take your finger off the shaft lock, it pops right back out again so hold it down while you're loosening and tightening.

If you don't see a shaft lock button, you may have a second hex nut at the base and with two wrenches, you can hold the hex nut and turn the collet loose that way.

If this answer was helpful, please give it a vote. Thanks.

I am guessing that you need instructions on how to use the chuck.
Put the drill in reverse, grab the chuck with one hand and then run the drill for a moment, this will loosen the chuck so you can insert a new bit into the end.
Be careful to not spin the drill too fast or you may hurt your hand.
To tighten the chuck you simply put the drill in regular/forward mode and grab the chuck while running the drill.

What you need to do is get a piece of strong strapping, on a stick like a jar opener, or a vice, or some way of "Grabbing" the chuck, other than you hand, even using the inner edge of a door frame and "Grip" the Chuck, Now with a nice fresh battery installed, put it in "Reverse" and holding the chuck tight operate the unit and it should undo itself.

the chuck sounds like it is bad or maybe stuck from rust, what you can try and do is spray some WD-40 on the jaws and then try and holding the collar with a glove and run the drill SLOWLY in forward/reverse and see if it loosens up if not you will need a new one.

Loosen drill chuck, insert flat end into chuck and tighten.....go drill some holes!

give a good coating of oil then clamp chuck in a bench vice or alike and using short bursts with it set in the forward direction to free the chuck

I hope I am understanding your question properly, if not, leave a comment. This drill *** a "keyless" chuck. If you look down into where the drill bit goes, there are metal pieces inside the black nose of the tool. Those metal parts are what holds the bit into place. The drill bit slides into the hole at the front of the drill (where it fell out from), Put the drill bit back in and then grasp the black tip (right below where you put the drill bit in). Directly underneath where you put your first hand, hold onto the piece directly below the upper part. Turn the top piece right and left and it tightens or loosens the mechanism that holds the bit in place. Give it a firm turn to make sure it is tight.

there is a rippled edge close to the very tip of the drill and there is a key supplied with the drill with the corresponding ripples place key into the hole near tip of drill so ripples meet each other and turn key in an anticlockwise direction to loosen put in new drill bit re tighten in clockwise direction hope this helps if not please ask for more info glenn

Just hold the Black part of the makita, I understand that its an 18v drill, and it has way more torque than a 12V but just hold on to it as hard as you can while you give it some power. You should be able to get your bit out. Once it gets loosened up a little its easy after that. good luck and let me know how that turns out. The Black part should be wanting to spin towards the left. Just hold that in place. Adjust your drill to the lowest speed. Good luck and let me know if this helps