How to un-stuck Dewalt drill chuck?

I’ve had 2 very strong men not be able to get my Dewalt drill’s chuck to open up. Is there a tiny set screw or Allen bolt that I can unscrew to take off the whole assembly?


Will look on their website and see if I can have the factory repair it reasonably and what kind of lifetime warranty it has. Am not interested in spending big money on new one.


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