Looking for a manual and/or what size chuck it uses. Craftsman 137280050 8" drill press. Thanks in advance.

SOURCE: how to remove chuck from drill press

I just looked at a breakdown for this tool and it is not that clear. But to get an owners manual you can go to Searspartsdirect.com and type in your model number and look at the same schematici I did and also order a manual for about 7.50. Usually though on a drill press like that it would be a morse taper. Do you see a slot cut thru the spindle on both sides, if so there should be a tapered key that came with the unit. In that case what you would need to do it put the key in the slot and tap it with a hammer to remove the adaptor and chuck. Let me know if I can help further

SOURCE: Replace drill chuck on 23 year old Craftsman 8" drill press

Yes it does have a Morse taper and you can remove it by gently hitting it with a rubber or nylon mallet.

SOURCE: locked drill chuck

i have the same tool and have had the same problem

i use 2 large prs of channel locks(water pump pliers) to break the bond

SOURCE: Craftsman Drill Press chuck problem

It is unless there is a tang on the end. What you need to do is thoroughly clean the parts with something like brake clean to remove all the oil and then wipe with a clean paper towel. What I do it put the arbor into the drill press or the chuck onto the arbor and then put a 2x4 on the table and press the parts together or if you have enough room fully retract the jaws and use the block of wood to "tap" the parts to seat them. Let me know if you need more assistance

Testimonial: "Thanks rowdy45176. Your solution was spot-on. I cleaned both sides and them , with the chuck jaws fully retracted, tapped it with a plastic mallet"

SOURCE: Craftsman 10" bench drill press chuck wobbles

If this is a new tool I would take it back and get it replaced. The only other way to eliminate this problem is to determine if it is the spindle or the chuck and replace the defective unit. Warranty works better.