HOTFR8
Banned
Ryobi drill. I can not undo the key less chuck. Have tried it in the vice and with vice grips and it will not open.
Can you spray some penetrating lube in there?
Just to be clear, you're trying to open the chuck, not remove it, right?
I JUST had this same problem. Bought a dewalt cheap off a yard sale, got it home to find out it was rusted/glued/magically F'n bonded to the jaws.
Tried soaking the chuck in vinegar, no go.
Filled it with and sprayed it with PB blaster, no go.
vice grips on large part, and vice grips on smaller part, no go. Even tried a hammer.
Watched one ******* youtube put a drill bit in the one of the chuck key holes (old style chuck) for leverage. On broken bit later, no go.
I got it unstuck by putting the smaller front piece in the vice and using vice grips on the bigger piece...and wrenching on it like I didn't care anymore.
Yes open it. It is jammed in the fully closed position I can not put a drill bit in it.
Tried WD40 RP7 type of products and still no luck. I am worried the plastic may break in the vice.
HOTFR8, I can't help you on this one as I have never had that happen..
If all you else fails, clamp the drill and try breaking the chuck retaining screw. It is reverse thread. A pipe wrench, oil filter strap wrench, or chain wrench should do it.
Edit: Wanted to clarify, While the screw is LH, the chuck is RH threads. So if you go this route, lefty loosey is what youre after with the chuck.
Retaining screw ?
... I am worried the plastic may break in the vice.
The screw is inside the chuck. You cannot see it with the chuck stuck closed.
Typically you would open the jaws all the way and use a screwdriver to remove it, and then unthread the chuck. You cant do that with the jaws stuck closed.
So the option i mentioned is trying to break that screw head. This would mean getting a new screw.
It is hard on the drill, but you dont have many options. Make sure the drill is in first gear and reverse.
Probably will. But that chuck is also probably toast already. If the lube and wiggling don't help, even if you get it open, it's got a lot of frustration left in it.
Anyway, you don't want to use so much force that you damage the gearbox in the drill.
The last time I encountered this, I sliced right across the chuck with a cutoff wheel. At that point, the jaws (and everything else) fell out, and I was able to remove it and replace with a new chuck.
Can you Chuck the Chuck in a lathe?...
You need a 48" pipe wrench and 6 foot snipe.
Try a strap wrench
Hit it with some CRC Freeze-Off Super Penetrant. I have broken loose bolts that nothing else phased. Might work on the chuck. Worth a shot.
Try tapping the ends of the jaws with a mallet or hammer, as you try opening the chuck.
Couple of pieces of wood, approx. 1' long, and drill a hole in each near one end just a gnats larger than the chuck diameter. Slit both pieces down their length to the hole, then slide one over the bottom part of the chuck, one over the upper, and screw each piece of wood with a screw through the side, to close the slit. You should then have two tight fitting levers to work away at.
Thanks every one. A combination of many of the ideas and it is fixed. I locked the chuck in the vise and set it in reverse then forward and a gentle tap with the hammer as well and it is now working again. 
This is what makes this forum a great place. Thank you all for the information. 


Great work everyone and thanks for the thread, HOTFR8, I learned a lot from everyone's suggestions and your solution.
However, this situation begs the question: How can we prevent this from happening? It never has occurred to me that a drill chuck could get stuck. Do you think oiling a drill chuck is a good idea? If so, which oil to use? If oil is a bad idea, what should we do as preventive maintenance?![]()
How can we prevent this from happening?
An interesting comment and I can add this drill I have had for many years and never had an issue. I have found Ryobi a good quality product.
That's wasn't intended to bash Ryobi products. I was in a hurry when I posted and probably should have elaborated. What I was intending to suggest was that it might be worth investing in a machinist quality chuck. They tend to be quite expensive (like more than most cordless drills) but could be considered a lifetime investment.
I never liked the chuck on my Dewalt so I replaced it with an Albrecht that I had that was probably 30 years old before I put it on the DeWalt. They run about $250-$300 and are overkill for a cordless but I had it.
I've got a Jacobs brand on my Makita that cost about $150.00 that I bought new. That's what I was suggesting. When your drill dies then you can move the chuck over to another assuming the same mount.

Tap it on the very end with a hammer, then try. Repeat until it comes open. Have had this a few times, this will get them open.