If you go to dewaltservicenet.com you can enter your model number to see the parts breakdown. It can be tricky to get the retainer clip off and on but the rebuild of the bit holder is easy other than that. The spring and the steel ball are all that usually need to be repalced. Hope that helps.
SOURCE: dewalt dc920 repair instructions chuck
To remove the chuck on your drill follow the instructions for the type of drill chuck you have:
Instructions for removing a keyed chuck
Most reversing drills have a left hand threaded screw located inside the bottom of the chuck.
1.) If the unit has this screw place the chuck key, with the chuck facing toward you, into one of the holes on the right side of the chuck. Strike the key in a clockwise direction with a wooden mallet or similar object. This will loosen the screw inside the chuck.
2.) Open chuck jaws fully. Insert screwdriver into the bottom of the chuck to engage screw head. Remove screw by turning clockwise this is a left-hand screw.
3.) With the chuck facing toward you place the key into one of the holes on the left side of the chuck. Using a wooden mallet or similar object, strike the key sharply in a counter-clockwise direction. This will loosen the chuck so that it may be unscrewed by hand.
There is no way to stop the motor from turning.
It may require several attempts to loosen the chuck
Instructions for removing a keyless chuck
Most reversing drills have a left hand threaded screw located inside the bottom of the chuck.
1.) If the unit has this screw open chuck jaws fully. Insert screwdriver into the bottom of the chuck to engage screw head. Remove screw by turning clockwise this is a left-hand screw.
2.) Insert the short end of a 1/4" or larger hex Allen wrench into the chuck and tighten. Facing the tool strike the long end of the hex wrench sharply counter clockwise as it is a standard right hand thread. This will loosen the chuck so that it may be unscrewed by hand.
There is no way to stop the motor from turning.
It may require several attempts to loosen the chuck
SOURCE: How to Remove Bit from Dewalt Quick Connect Adapter DW0521
Hold the chuck by its sleeve, put the drill in reverse (make sure it's set at high torque if you used it in a drill/driver) and go full speed. That should release the bit.
SOURCE: got a broken drill chuck i cant get off (Dewalt)
first remove the chuck retaining screw LH thread, next shift the tool to the drill only position and the low side. Find a bent handle allen wrench and insert the short piece into the chuck and clamp down, place the chuck with the long portion at about a 30 degree so you can strike it counter clockwise, usually a block of wood or work bench will do and then get a hammer and safety glasses and hit it, it might take a couple times but it will come off
SOURCE: removing the dewalt DC925 'rohm' chuck
I simply placed the chuck into a large vise and turned the drill counter clockwise and the chuck spun right off no problem without damaging anything!! It does have some thread lock on the chuck but just use your man strength and its as simple as turning the lid off the pickle jar! Do not waste your time or money with the removal tool...YOU DONT NEED IT!
SOURCE: problem with the chuck
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.
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