Hoping someone can help… I have a Bosch cordless drill and the Chuck has jammed open. I’ve googled it and can’t find anything that helps.

Unscrewed to retaining screw inside the Chuck…

If I grip the outside and run the drill, it turns without loosening.

Videos show using an Allen key to put inside the jaws and knock it round, but no key is the right size (unless its a 9mm which I don’t have).

Anyone had the same have any ideas?

Have had chucks jam. Usually giving them a damned good hiding with a soft faced hammer fixes things. Is it full of wood dust and plaster? Fill it with Gt85 and leave it for a while then clean it out with cotton buds. Give it another beating and repeat.

Videos show using an Allen key to put inside the jaws and knock it round, but no key is the right size (unless its a 9mm which I don’t have).

They use a Torx in this video on this Bosch.

Could be new chuck time if anything like this one with a broken thingy ring.

Pretty much as above I’d use penetrating oil but anything a bit solventy and a bit oily. Leave it a bit then tap it about a bit aslso some gentle tapping on the tip of the jaws with a pinch or a screwdriver.

Thanks. @kayak23 that’s the one I watched as it seemed relevant. Need to find a torx big enough.

It’s not jammed with crap, it’s fairly new and only seen light use (more to the annoyance).

Blue Bosch drill chucks are crap (we have them at work), they have no grip strength whatsoever.
Whenever ours does the weird constant ratchety thing a quick bit of back and forth wrist action usually free’s it.

As above they are Jacobs clones but made especially worse somehow.
I would hit it until it waves a white flag then swap it out for a metal one if you can find one. The old metal DeWalt ones where very good.

I’m a bit confused as to what’s needed. I’ve tried all kinds of wrist action (oo-er) and clamping the Chuck while running the drill. The jaws are just stuck at the back.

If I’m hitting it with a hammer, what am I hitting / hoping to achieve? Just dislodging the jammed jaws? (@pk13 ?)

Yup sometimes they get stuck at the bottom opened not a lot you can do to get them working again unfortunately.
Tapping the chuck sometimes unbinds the spines the problem you have is getting the chuck off to replace it even with the screw out as you might need to do the chuck up with an Allen key In it to unthread the chuck spline. https://youtu.be/boehGcrozmE

Let me check what mine is held on with

Bosch gsb18
T25 bit fits snug