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Reversible drills sort of threw a spanner in the works of established practices of providing a right-hand threaded spindle onto which a chuck was simply spun into place and the final tightening would take place in use.
Adopting the Jacob's Taper would have provided the answer but in production cost always has the final word. In desperation some of those early reversing manufacturers opted for adhesive, making replacement practically impossible.
Computer aided manufacture hit the industry like a storm and provided the answer by making it economic to provide a left hand threaded counterbore in the conventional threaded spindle allowing standard (or slightly modified) chucks to be retained by a 5mm LH countersunk screw when reversing.
The system works well for drill/drivers but the counter screw often becomes damaged and impossible to remove with combi drills used extensively for hammer drilling.
Removing a standard keyed chuck has always been fairly simple but keyless chucks, especially low cost keyless chucks fitted to cordless drills can be a huge problem. Corded drills usually have enough torque to be driven in reverse with the chuck held tightly in a vice.
Over the years I have failed to remove one chuck, destroyed a couple of chucks in order to remove them and even had to dismantle a couple of drills so the shaft could be gripped in vice jaws...
just grab a short extension cord and open up the drill and cut the female end off the extension cord and either solder it in or crimp it in if that seems doable. If it runs in reverse switch the wires.
If you open the chuck as far as it will go and look inside you may see the head of a screw, especially if the drill is reversible. So undo the screw and then you should be able to unscrew the chuck. But I am not sure if it will be easy to unscrew. With a keyed chuck you use the key and a hammer to unscrew the chuck.
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.
If the jaws of the drill no longer works, then, the drill chuck must be replaced. Take it off by turning the chuck counterclockwise, and putting an open wrench at its neck to lock it. Then, after taking it off, you can now have it replaced.
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