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.
I asked about a "keyless" chuck. Plus, there is no retaining screw inside the chuck. I have removed chucks before, but this one is puzzling.
I have removed numerous "keyless" chucks. Every one had a retaining screw in the center?
I will see what I can find out for you, maybe yours is different. Be back soon.
I found a parts list and drawing here -http://servicenet.dewalt.com/Products/De...
You are correct it does not show a retaining screw. It does show that it has 1/2x20 threads, so you should be able to lock the allen wrench in as described previously and tap it sharply with a hammer in the reverse direction to break loose the chuck.
Good Luck.
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We are the manufacturer for keyless drill chuck in China.
10mm and 13mm keyless chuck available.
Regarding to keyless chucks, two sleeves, you could move the chuck from Dewalt tool by turning the rare sleeve of keyless chuck. and replace a new keyless chuck.
Please have a try.
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