There has been quite a bit of discussion on this topic over on our discussion forum. It seems that most agree that the chuck can be removed using tried and true techniques, no special tools.
You can find the forum discussion at the following link...
Hi Pat! We had a big thread on the forums about this chuck a while back, and the conclusion we came to is that you can use the standard allen wrench method (outlined here: http://www.ereplacementparts.com/removing-drill-chuck-c-8873_15176.html ) with this chuck - no special tools or techniques required.
If you're not comfortable with that, the safest option is to buy the full Chuck and Spindle Assembly (Figure 35 on this page - Part number 629828-00) and avoid the chuck removal process entirely.
For more information, refer to the thread about this chuck:
http://forums.ereplacementparts.com/power-tool-repair/132-how-do-i-remove-dewalt-dc925-chuck.html
We had one here at the shop. It was the wrong size. ordered another and it was also wrong. For now save your money. Until dewalt gets it right. I still do it the old fashion way. Big allen wrench, Big hammer, They are a little stubborn. And they use locktite at the factory. Four or five wacks with a two pound hammer does the trick. Make sure your in low gear and the clutch is in drill position.
Reply: Chuck Removing Tool
mac
I have but the last one took about 8 blows before it got lose i tought it be less dificult with the tool but tanks for the info
Reply: Chuck Removing Tool
Dale
I Think its more difficult with the tool. You have to disassemble the tool. Take the spindle housing apart. The tool slides over the spindle end. Then you lock it into a vice. And twist your chuck off. With a pipe wrench or a Allen key. I like the BIG HAMMER. :D I have made some similar tools for the Bosch and Makita Drills. I take the guts out. Then weld the gear,
the spindle slides into.
On the end of a metal shaft. works great when you have a bad gearbox. I hope this makes sense. I failed English