SOURCE: Dewalt Drill DC728. Chuck came out of drill body
If you find that the end of the screw inside the chuck is actually broke then you have a gear problem inside your drill. This is actually a very common problem. Sometimes people push too hard on their drills and the gears inside wear out and break. This prevent the motor from wearing out, but, the gears have to be replaced.
If it is the gears and not the chuck. you broke the minimium of the front gear or gears inside your drill. YOU CANNNOT repair gears. they need to be replaced. you may be able to find some off brand gears to work but, you run the risk that they are not as strong as your original ones, or may not be exactly grooved correctly.
so, if replacing your chuck does not work. find replacement gears. IF you cannot find the gears from the manufacturer see about replacing your drill.
If the chuck is still good, keep it. If you buy the same model, keep your old drill for replacement parts, ie, switch, armature, cord, etc.
hope this helps somewhat.
SOURCE: HOW DO I LOOSEN A KEYLESS CHUCK TO REMOVE A DRILL
Keyless chucks normally have a knurled ring at the base of the chuck that you hold in one hand while turning the large knurled taper with the other. If the chuck has been overtightened, and you cant open like this, try using two stilson wrenches (Pipe wrenches) one on each of these parts. Use a soft cloth in the jaws to avoid damaging the knurling. You can also try some Q20 or similar into the chuck to help lubricate it.
SOURCE: Keyless Chuck how do you change the bit? Model
hold outside collar on chuck firmly with your hand and reverse drill
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: Black and Decker Cordless Drill Chuck stuck in full open position
I'd put penetrating oil in it and tap the chuck with a plastic hammer. That should free it up.
Best rgrds, W/D
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