I HAVE A DEWALT 991 3/8 DRILL DRIVER. THE MOTOR TURNS AND SOUNDS FINE--THE CHUCK CAN BE HELD WITH LITTLE PRESSURE AND A CLICKING SOUNDS COMES FROM IT. DO YOU THINK IT COULD BE THE CLUTCH ASSEMBLY? JIM

May have stript the gears

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.

Open the chuck wide open. In the center is a retaining screw, they usually have left hand threads. Remove the screw. Take an allen wrench1/4" to 3/8" in size and fasten the short side tightly in the chuck. The chucks are usually right hand thread, so take a small hammer and strike the allen wrench to turn the chuck to the left to loosen it. Once you have the chuck off, verify the thread size of the drill motor shaft, then go to McMaster-Carr and choose the one you need.

Hello, W/D here.

To remove your chuck, open the jaws of the chuck fully, but don't open them so tight that they lock in the open position. Remove the screw inside the chuck. Spray the inside of the chuck with penetrating oil. Tap around the edge of the chuck, while pulling it away from the motor.
It should come right off, with a little effort.

Best regards, --W/D--

if it is a keyless chuck soak the inside of the chuck with oil. charge the battery so you have max power. put a cloth around the chuck and use a pair of channel locks to hold the chuck and put the drill in reverse. good luck

this is not a common problem with dewalt. I have been using them in my construction business for years and only heard of this once or twice. I would go to their web site and get the number for their customer service. They stand behind their products and im sure they will help in every way they can to repair the drill

the transmission uses a planetary gear system. the motor is a johnson gearmotor. change the transmissioon. go to the dewalt service center for parts.

Open the chuck jaws and you will see a screw in the center of chuck, it is left hand thread. remove it and use a large bent handle allen wrench putting the short portion in the jaws and tightening. Shift the drill to the low position and have the clutch in the drill only position. place the handle of the wrench at about a 30 degree angle to strike it counterclockwise. put the chuck on a block of wood or workbench and hit it, this might take a couple times but it will come off. Let me know if you still need help

Had the same problem on mine. Remove the chuck, then remove the snap ring on the back of the chuck( carefull, the housing will fall out once the ring is removed), on the side of the chuck you'll find a cam and small odd shaped spring held in by two cylender pins, on mine the spring had a gap in it and I just spread the gap to about twice the size in was and put everything back together and it has worked fine ever sence. Hope it works for you.

Your chuck is held onto the motor shaft by a screw located inside the chuck. This screw has loosened and requires tightening. This screw has reverse threads and in order to tighten it, you need to turn the screw in the opposite direction or in oither words, in the reverse direction.