Milwaukee1/2 magnum hammer drill keyless chuck stuck closed

SOURCE: drill chuck swap

1. Turn the screw clockwise to take it out.
2. Then you needs 3/8 allen key & insert the short side of the allen key & tighten the chuck.
3. hold the drill at the edge of the table & wack the allen key
counter clockwise & do it again as needed.
4. dewalt keyless chuck will fit but you might add a washer to insure the chuck is not rubbing the clutch collar.
5. putting it back together the other way.

SOURCE: Bit stuck in Bosch PS20 keyless chuck

These units have only been out for a short while and most are on warranty. Take it to a Bosch Service center in your area and they will replace the front of the unit. Unfortunatly this is a problem with this type of unit. The bit will deform slightly from the impacting action and lock itself in the chuck.

SOURCE: Makita Percussion Drill HP2051F keyless chuck release problem

jacobs come out with this all metal keyless chuck(i think thats what you have) and if thats the case, there is no solution for this youll have to replace the hole chuck, being its new, it may be under warrenty

SOURCE: Cordless Drill, Keyless Chuck stuck in full open position.

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

SOURCE: I have a Black & Decker 18V cordless drill

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.