I had removed and replaced my drill chuck a few times prior to sending my 17-950 in for service. They must have used a press or something because that guy will not come off.
Bearing in mind that the temps here have been 100+ for a while and the service guys may not be at fault. I used a block of wood and a 16oz hammer to tap it as hard as I dared.
Just in case the old freezer trick doesn't work, does anyone have any tips? I am going to give a keyless chuck a try (when I get the Jacobs off that is).