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I would suggest contacting one of our Factory Service centers so we can take a look at it. Please see the link provided. DEWALT com

key less chucks are not the best .. You can get bits w/ squared sides .. or use channel locks to grab chuck & tighten better,,

down inside the chuck head itself is a allen head screw,, it has reverse threads on it. if you have already removed this screw and the chuck is still stuck then you will need to use a small gear/pulley puller to get it to release.
(( note: if you do not have access to a puller -- stop by you local Dewalt repair shop and I am sure that they will pull the chuck off with their puller at no charge to you )).


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If the drill is not too old, I would take it to your nearest factory dewalt repair shop. they have a good warranty on their items. If it is older you probably need to replace the chuck itself. You need to remove the plastic to get the chuck open and then there is a screw down inside the chuck that needs removed. The chuck should come right off and just reverse the process to install the new one.

http://www.ereplacementparts.com/dewalt-dc759-type-18v-cordless-drill-parts-c-1009_1162_2837.html

Here is the parts diagram. I hate to say it but I always have problems getting the chuck out of the clutch/transmission without breaking something. I havent figured out how to keep the spindle from moving while I try to turn the chuck. Sorry if this doesnt help much.

I work in a large shop and I do most of the tool repair.  We do use DeWalt cordless guns so I have done this before.   I change these as often as they break at work.  About every 4 months the teeth fall out of a chuck and I replace the chuck with a new one.       To remove this chuck you should  use a heavy duty metric allen key and a good vise. The trick is to remove the small metric reverse thread screw. It is between 3 and 5mm.  Place the "L" of the allen key firmly in the vise with the long end pointing straight up.  Open the chuck all the way. Using a fully charged battery, place the gun in low (1st gear) and put the direction of the gun in FWD (as if you were driving a screw in), set the clutch to the drill setting (maximum torque) and drive that screw out of the chuck.  If the battery is not strong enough to drive the reverse thread screw out you will have to help it out.  Rotate the rear of the chuck clockwise and hopefully the screw will come out.  If that is not enough torque, I find the use of a small strap clamp helpful to turn the chuck against the reverse screw. Hope this helps.  Best Results!  Michael Mittelsdorf

I just changed the chuck on my 18 volt xrp half inch hammer drill,yes first you must remove the torx screw with #15 torx bit,note this is a left handed thread screw,knowing the bad chuck was bad I added some heat from a propane torch to the chuck then making sure it was in 1st gear i took some vise grips and the chuck is screwed on with normal right handed threads,it broke loose (was stubborn but needs a lot of torque )ahhhhhh wat a pain.

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.

your drill required trans assy & clutch assy for $132.00 plus tax canadian max repair/
thanx