How to remove Chuck from cordless driver drills?

For chuck removal first remove the chuck retaining screw which is LH thread. If this tool has a high/low selector shift to LOW and if equipped with a clutch shift to the drill only position. Find a bent handle allen wrench about the size of chuck capacity (the larger the better, less flexing) and insert the short portion into the jaws and tighten. Position the chuck on a workbench or block of wood with the longer portion at about a 30 degree angle so you can strike it counter clockwise with a hammer, strike the longer portion and the chuck should loosen (it is standard thread pattern) It might take a couple hits to remove. Chuck installation would be to reverse the above to seat the chuck and reinstall the screw.