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I'm assuming you have a DCD970 as DeWalt doesn't have a DC970 and the DW970 is an impact driver. The chuck on your drill is a new design that doesn't have a lock screw inside the chuck, they are put on very tight with lock-tite to hold them on. They are made to be taken off with a special chuck holder and vice jig that only service centers have. The allen wrench method used on older chucks won't work as the chuck will just loosen when you hit the allen wrench. I have on occasion removed one by doing the following: Turn the chuck fully open then secure it in a vice with the drill straight up. Holding the drill body and using the handle for leverage, turn the drill counterclockwise, as you are looking down on it, with steady, strong pressure. If the chuck breaks free it will spin off easily. If you are at all afraid you may break the handle you may have to take or send it to a service center to have it removed.
The large black part of the chuck should turn left and right to extend (close) and retract (open) the three chuck teeth that hold the bit in place. Turn the chuck to open it far enough to get your bit fully in the chuck then turn it closed to hold the bit in. When the teeth make contact turn the chuck a bit further to get it tight enough that the bit won't slip. When you get used to it, sometimes it's easier to hold the chuck lightly and turn it by lightly squeezing the trigger to turn the chuck with the drill motor.
The DCD950 drill has a chuck that does not require the reverse-threaded lock screw. It is put on with lok-tite and a good deal of torque. It is hard to remove without the Dewalt vice tool to hold it but not impossible. Some can be removed by tightening the chuck in a vice and, using the drill handle for leverage, apply steady, even, strong pressure until it breaks free. Using this method usually bends the part of the chuck in the vice making it useless. Another reason for the chuck not turning when the motor is turning is a broken transmission. If the chuck works properly in tightening down and releasing bits, your problem may be in the transmission. If you go to http://www.ereplacementparts.com/ and search for your model number you can look at a breakdown of your drill and what you're looking at to replace the transmission.
Sometimes this happens when you have a drill bit that slip. Take a pair of channel lock pliers, and try and turn the chuck counter clockwise. Do it sharply so the drill doesn't turn. IF that still doesn't work put the drill in reverse and try the channel locks again
hold the back of the chuck with channel locks or a vice and use the same channel locks on the front and open the chuck manually it should work and you can get to the screw to replace it or the hand chuck. this can be a little frustrating but hang in there and you'll be a pro shortly.