How do I exchange bits in the keyless * BLACK & DECKER 12-Volt 3/8" Cordless Drill

try this parts supplier
Black and Decker Cordless Drill Parts

see if your model has a parts list for battery and charger

if discontinued
look for tha same used drill in better condition
or toss in the bin

Try giving the inside a spray with WD40 then try closing the chuck. Check that there is not a left handed screw in the center of the chuck that has become partialy unscrewed. The chuck can jam open and just need a strong gril to release it. If the outer sleve of the chuck is turning but nothiing happens then you will need to get the chuck replaced.

I oil mine up to help the jaws move . also check the screw at the base of the chuck inside its a standard head. shine flash lite where you put the bit it holders the Jacobs chuck to the shaft.

Just charge battery put bit in and your ready to go.

This close to father's day you should be able to buy a new drill for about the same as a battery. The 12v would overheat the motor if you ran it for an extended period.

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.

Most cordless drills use keyless chucks these days. Shift the drill into reverse and hold the main body of the chuck. Pull the trigger and the bit should come out. Put it into forward and run it to tighten onto a new bit.

if chuck is wide open ,look down inside there should be an allen screw or bolt at the bottom of the chuck it should undo anti clocwise and the chuck comes off

hold outside collar on chuck firmly with your hand and reverse drill

I would guess 12 volts