My Delta DP has the original 5/8, Jacobs key type chuck. The original manual said very little. It did not say anything about cleaning the chuck prior to use. I did not. I used it the way it came figuring the slight stiffness was due to being new.
The chuck has been getting more and more difficult to turn by hand. It is now to the point that turning the chuck by hand turns the entire mechanism, including the motor. Sticky goo is seeping down from between the "collar" used to adjust size and the cylinder that contains the jaws.
The Delta manual says nothing about cleaning the chuck (or anything else except the table). The Delta web site has no information about this. It is Saturday and Delta is not answering the telephone except to tell you when to call.
My inclination is to get a clean empty food can, pour in some thinner and let the thing soak. Later slosh it up and down in clean thinner repeating as indicated by thinner color. That should give me a dry chuck. Many years ago I repaired typewriters (you know, those mechanical things with levers and without electric hook-up) dry was good. (WWII I took a test receiving code for 10 minutes, no errors permitted, at 102.2 wpm on a dry LC Smith typewriter).
Is dry good for the chuck? How should I lube it?
I sure managed to use a lot of words to ask two simple questions.