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look inside the center of the chuck... if the is a bold inside, remove it. then place the short side of a 3/8" allen key into the chuck and tighten the chuck... then smack the allen key from the side with a hammer the same direction as forward rotation...
Sears sell chuck keys in all of the common sizes, of which there are only a few. If you have the old key, take it with you. If you don't have the old key then find the diameter of the three holes in the chuck (easy way to do this is to see what size drill fits into those holes) and measure as closely as you can the diameter of the gear you need. This is tapered, so measure (and double) the distance from the center of one of those three holes to the bottom of one of the gear notches on the ring on the chuck. You could also take the drill to the store with you! Good luck!
No you don't have to buy Delta's chuck key. MOST drill press chuck keys are very similar but if you do order another companies key and it doesn't fit, you may be stuck with it. If you have a local tool repair center that carries keys you can try one and if it don't work, return it. The Delta part number for your chuck key is 1313104. It is avaliable from Dewalt (they own Delta) on their service website at http://servicenet.dewalt.com. You can also get it at aftermarket sites like www.ereplacementparts.com for only $11 plus shipping.
The chucks on these drills are put on not only VERY tight but usually with some lok-tite to boost so they don't come off easy. In my shop we usually lock a 1/2" hex driver in the chuck and use a 1/2" impact wrench to knock them loose. It usually takes a few seconds to come loose. Another method is to lock the short end of a 1/2" allen wrench in the chuck so that it sticks straight up with the drill standing up. Then lay the drill on its side with the top at the edge of your bench and the allen wrench sticking over the side of the bench. NOTE: The chuck follows the lefty-loosey, righty-tighty rule, the chuck screw is reverse thread. Have someone firmly hold the drill and then hit the end of the allen wrench until the chuck comes loose. Once you break it free it will spin off easily. You do need to put the new one on with lok-tite and as tight as you possibly can then lok-tite the screw and tighten it as much as you can by hand.
I am assuming your chuck is jammed .Use a pair of pipe wrenches and rags to pad the jaws.Place one wrench under the back part of the chuck on left side with drill pointed at you.Put the top wrench in same direction on the front of the chuck.This should look like this _ >o_.Now tap the top pipe wrench handle with a hammer so you don't hurt your hands.I were gloves while doing this.Please let me know if you have any questions.THANK YOU for picking FixYa.com....Darryel
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.