Think I've tried lubing this chuck a couple times, probably wd40 then triflow or the like. But if people are saying chucks simply wear out in one way or another, either jaws that become too smooth or also in this case, a lack of that satisfying tightening/cinching action, then I suppose a replacement is necessarily called for. It seemed a bit challenging going through the manufacturers site, but with a search of "dewalt dcd790 replacement chuck," I found this Rohm on amazon that looks fairly stout. Thought I would see if anyone had any opinions on this or any other specific recommendations. $50 has me wonder whether a deal on a new drill or used of decent condition would be more cost effective ..
I took the old chuck off to get a look at what make of chuck came stock and how much of an upgrade this replacement would be. Nothing comes up with a search of the number on the back, but maybe someone has an idea?