Disconnect the drill from its power source by disconnecting it from the electrical outlet or by removing the battery.
Place the chuck key in the hole located on the side of the chuck, and mesh the gear teeth on the chuck with the gear teeth on the key. Rotate the key clockwise to open the chuck as far as possible. Place the key off to the side. If necessary, loosen the chuck by striking the handle on the key with a mallet or hammer.
Locate the screw on the inside bottom of the chuck. Turn the screw clockwise with a screwdriver to remove it from the chuck. The screw is reverse-threaded.
Place the chuck key on the hole on the left side of the chuck. Strike the key with the mallet in a counterclockwise motion to loosen it. Once it's loosened, thread the chuck from the drill counterclockwise with your hand. Keep in mind that there is no way to prevent the chuck from turning the motor, so it can take several attempts at striking the chuck key to loosen it.
Place the drill in reverse by pressing the directional button on the handle by the trigger. Grip the chuck tightly with one hand, and then turn on the drill by pressing the trigger with the other hand. The chuck will open to its fullest position.
Disconnect the drill from its power source by disconnecting it from the electrical outlet or by removing the battery.
Locate the screw on the inside bottom of the chuck. Turn the screw clockwise with a screwdriver to remove it from the chuck. The screw is reverse-threaded.
Place the short end of a ¼-inch Allen wrench in the jaws, and then tighten the jaws on the chuck by spinning the outside casing of the chuck with your hand until the jaws tighten around the Allen wrench. Do not reconnect the drill to its power source to tighten the chuck. It could cause the Allen wrench to fly from the chuck if your hand slips.
Strike the long end of the Allen wrench with a mallet to loosen the chuck from the drill. Once it's loosened, turn the chuck clockwise with your hand to completely remove it from the drill. There is no way to stop the motor from spinning, so it can take several attempts at striking the Allen wrench before the chuck breaks loose.
Loosen the chuck, following the keyless chuck process or the keyed chuck process, depending on the style of chuck your drill has.
Disconnect the drill from its power source by disconnecting it from the electrical outlet or by removing the battery.
Place the short end of a ¼-inch Allen wrench in the jaws, and then tighten the jaws on the chuck by spinning the outside casing of the chuck with your hand until the jaws tighten around the Allen wrench. Again, do not reconnect the drill to its power source to tighten the chuck.
Strike the long end of the Allen wrench with a mallet to loosen the chuck from the drill. Once it's loosened, turn the chuck clockwise with your hand to completely remove it from the drill. As a reminder, there is no way to stop the motor from spinning, so it can take several attempts at striking the Allen wrench before the chuck breaks loose.