More leverage never did it for me on stubborn ones. Another vote for the impact wrench. Chuck the hex end if the biggest hex bit that fits in the chuck and snap the bit onto the impact wrench and pull the trigger. Never failed me. You don't even have to clamp the drill; the shock breaks it loose, just like taking lug nuts off a car with a jacked up wheel. I repaired a floor jack recently and tightened the top nut on the pump with a BIG cheater bar. I hit it again with the impact wrench and got another half a turn out of it. Hammering beats prying every time.I fixed the short end of an 10mm allen wrench in the chuck (not too tight, just tight enough to eliminate slop), clamped the drill body down to the bench and slipped a 2ft long 1/2" copper pipe over the long end of the allen wrench. The allen wrench will bend, but as long as you didn't get it from HF it should hold. It takes a bit of force to crack it loose. Once you break it loose, snug it back down finger tight and open the chuck jaws to get your wrench out and then remove the chuck from the drill body.
I started using the impact wrench when the allen key and the hanmer didn't do the trick. The blow was not sharp enough and the chuck would rotate absorbing the shock.I agree with the impact wrench. Put the drill in the lowest gear. Take out the screw (LH thread). Put a hex bit in the chuck and unscrew it with the impact (RH thread).
The alternative is to do the same with an Allen wrench in the chuck and whack it with a hammer while holding the drill flat on the bench. It might take a few hits but it will come. It is still "impact", just the good old fashion way.
S
a 3/8 or so allen wrench chucked up , several good whacks with a hammer and most will loosen. it is regular rh thread , and as you know the retaining screw is lh thread
If you have an impact wrench load up a hex bit socket, biggest hex you can. Chuck up on the hex and engage the impact. You might also have to blip the drill trigger
Hook up the cut off wheel and split the old chuck.GOT IT!!! Chucked a 3/8 hex socket into the drill, which wasn't easy because the reason it was being replaced was that one of the jaws fell out. Used the Makita impact with a 3/8 socket adapter. Basically ran a full battery down to nothing. Still wouldn't budge. Fired up the compressor and tried my pneumatic impact. Took about 5 minutes and several cycles of draining and refilling the tank. Finally broke loose. Now I have a 3/8 Allen socket stuck in the old chuck that I can't get loose. May have sacrificed that one to the tool gods lol
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