Clutch My clutch is stuck on the driver setting. I have tried loosening and tightening the keyless chuck several times, but that seems to do nothing yet. HELP!!!!

Keyless chucks work one of two ways
1: Simply turn the chuck by hand to loosen or tighten drill bit, once it grips the drill bit you will not be able to turn it anymore
2: Some keyless chucks operate by pulling the chuck back towards the body of the drill, placing the drill bit in and then releasing the chuck back to its original position

I have the same problem. It got progressively worse over time. The chuck did not want to tighten all the way at times and then got stuck open. There is a screw in the center to hold the chuck on. It is a left hand thread and I believe it loosened and the jaws became jammed on the loose screw. I tapped on the screw using a screwdriver and was able to tighten it a bit thus allowing the jaws to free. I removed the screw, put some thread locker on the threads and reassembled it. Seems fine now

Try shooting some WD-40 lubricant into the 'chuck' and let it sit for awhile, then rotate the outer part of the chuck CCW to loosen the 'jaws'. If the chuck is a keyless type, just hold the chuck and turn the reversing switch to 'reverse', then gently apply power to the trigger--that should open the chuck jaws. You will likely find that a leather glove on the hand holding the chuck will help prevent a burned hand if you lose your grip. If it is a keyed--type chuck (there will be ring of gear teeth on the front edge of the chuck), then a key with a small gear near one end is required to turn the chuck open (turn the key CCW). Hope this helps!

Remove the REVERSE-THREAD screw at the bottom of the chuck. Set the clutch collar to the highest setting, and set the gear to the slowest setting if this drill has a 2 speed transmission. Remove the battery! I have performed this with the battery in back in my noob days, and getting an allen wrench in your rib because you accidently hit the trigger will only happen once. You will never forget that experience. Get the biggest allen wrench you can fit in the end of the chuck(the shortest leg) and tighten the chuck down around it, allowing the jaws to rest and tighten on the flats of the wrench. Lay the drill on its side(chuck toward you, handle to the left, and allen wrench to the left, horizontal to the deck. Then with a hammer(soft hammer if you care about the allen wrench) quickly and deliberately hit the allen wrench in an attempt to cause the allen wrench to spin counter clockwise. You have only a few to several attempts at this before you risk damaging the clutch, so make the first one count. Follow through like you are attempting to hit something 6" below the allen wrench. If this does not do the trick before you shell the clutch/gearbox, you are looking at an expensive undertaking, most likely a new drill. I have only shelled 2 clutches out of literally tens of thousands of chuck repairs, so don't worry, just be aware. Let me know how it goes!

Make sure you try it in both directions.

That can happen if the jaws inside the chuck, usually 3 triangular pieces get jammed together. With chuck facing down tap chuck several times to loosen jaws. If that doesn't work spray a small amount of WD-40 into chuck and try again

keyless chuck. grab the ring immediately behind the chuck and the tampered chuck piece with a padded channel lock plier. turn the chuck part clockwise to release.

If it's anything like their other drills, there is a safety screw with left-hand threads inside chuck.

1. Turn it clockwise until loose.
   
2. Then insert the short arm of a 3/8" hex wrench and tighten.
   
3. Strike long arm of wrench sharply counter-clockwise and chuck should loosen to unthread from spindle.
   

If this is a newer tool it is probably a Torx drive screw usually a T20. The screw is LH thread and after removing it you will need to put some screws back in tool to remove the chuck. First shift the gear selector to the low setting and the clutch to the drill only. Next get a bent handle allen wrench about the capacity of the chuck install the short end of wrench in chuck and tighten. Put the chuck on a block or wood or a workbench to support is and turn the wrench to about a 30 degree angle in the counterclockwise position. The chuck has standard threads so you want to hit the wrench with a hammer to loosen it. This might take a few tries but it will work. Good luck

1. Turn the screw clockwise to take it out.
2. Then you needs 3/8 allen key & insert the short side of the allen key & tighten the chuck.
3. hold the drill at the edge of the table & wack the allen key
counter clockwise & do it again as needed.
4. dewalt keyless chuck will fit but you might add a washer to insure the chuck is not rubbing the clutch collar.
5. putting it back together the other way.