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Can't disassemble drill chuck

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MikeK26/01/2022 00:27:28
226 forum posts
17 photos

I'm trying to disassemble my Chinese drill chuck to no avail. I've already tried: mallet, block of wood with 3lb sledge, and arbor press.

Sure seems to be constructed like the standard Jacobs chuck...central body with outer collar. The central body at the back is a larger OD than the front so it can only come out one way.

Has anyone experience with these?




colin vercoe26/01/2022 07:18:49
60 forum posts

Try it with the jaws further towards the closed position, and press out from the front end.

mgnbuk26/01/2022 08:18:36
1175 forum posts
71 photos

I have had the one that came on a cheap drill press apart a long time ago. I can't recall exactly how I did it, but most likely using a 4" bench vice to provide the force as I don't have other means at home.

Turned out that the teeth on one jaw had stripped, so it was scrap anyway & not really worth the effort of getting it apart, given a Sanou replacement with the correct taper from Ebay was under a tenner delivered. The Sanou chuck has outlasted the no-name original.

Nigel B.

Neil Lickfold26/01/2022 08:26:39
835 forum posts
166 photos
For what ever reason I could not embed this video at 450 wide.
It shows how to take apart a Jackobs  drill chuck.


Edited By Neil Lickfold on 26/01/2022 08:27:45

Nigel Bennett26/01/2022 11:46:23
456 forum posts
20 photos

I wonder if that black ring at the rear end of the chuck is swaged over; that would mean that you couldn't dismantle it without destroying it. A simple means of saying, "Buy a New One" by the manufacturer.

Nicholas Farr26/01/2022 12:45:26
3310 forum posts
1524 photos

Hi, these can be fairly tight and I have had to use a hydraulic press to get a few off, of course, someone may have put some retainer on the half nuts to stop it slipping as in Nick Lickfold's post, so may need a heat gun blowing on it. The photo below shows what can happen if you retract the jaws too far back into the body when dismantling.


Regards Nick.

MikeK26/01/2022 14:20:56
226 forum posts
17 photos

Thanks for the responses, guys.

I was trying to solve two problems: 1) the "lube" used for assembly is really gummy and makes turning the collar often difficult and b) the collar will rotate about 1/6 of a turn before engaging the jaws.

The above video was actually the one I was using for guidance...just not getting the ease of disassembly he got. I'll try moving the jaws forward and with a suitable pressing ring on the body.

Yes, I should probably get a new one. And keep this one for backup. Really curious about the 1/6 turn of dead space, though.

clogs26/01/2022 16:08:15
626 forum posts
12 photos

on the same subject, well almost....

I have a 90degree Hitachi mains powered drilling machine...

lent it to someone who was a friend but no longer and he's busted the teeth on the chuck....I have secured a big allen key in the chuck and belted it with a huge copper mallet to try and unscrew it to no avail......dont want to damage the crown wheel drive by hitting it any harder.....

any suggestions other than sending it for repair and replacement chuck......

similar thing, any pref of a make of self tightening chucks other than the £100 jobbies...dont mind if they come from Poland etc....even Chinese if they come recomended......

I need at least 3 for different machines....

many thanks....

Mike Poole26/01/2022 17:10:37
3302 forum posts
73 photos

It may have a retaining screw for left hand running, open the jaws wide and check for a screw into the end of the drive shaft.


old mart26/01/2022 20:34:16
3717 forum posts
233 photos

As soon as I saw the picture, I had the same thought as Nigel Bennett, it might be swaged. I have a piece of tube, bored to press exactly where that rounded edge is at the rear on chucks. The one I made works for 1/2" Jacobs and 1/2" Eliot. The rear swaging was common on electric drill chucks, but I have not seen it on industrial chucks.

Edited By old mart on 26/01/2022 20:35:59

Simon Williams 326/01/2022 22:20:06
652 forum posts
82 photos

+ 1 for the swaged theory for me. I've played this game with several of the industrial grade Jacobs chucks successfully but never managed to get one looking like this apart. That rounded edge rings alarm bells.

And even if it is something that will come to bits and be OK to re-assemble, you'll need a lot more urge than an arbor press, or just hitting it with a hammer, even a big one. My 10 tonne hydraulic press will do this job but only just. Squishing it in a vice comes nowhere near.

HTH Simon

MikeK26/01/2022 22:46:52
226 forum posts
17 photos
Posted by clogs on 26/01/2022 16:08:15:

on the same subject, well almost....

Please start a new thread, so that each can receive the attention they deserve. Thank you.


MikeK26/01/2022 22:49:32
226 forum posts
17 photos

Re: swaged collar...The reason I didn't suspect the collar was swaged is that it is substantially thick and not a tube that could easily be swaged. Seems like extra manufacturing? I'm going to give the arbor press another go.

MikeK26/01/2022 22:53:52
226 forum posts
17 photos

Okay, I was able to slide a brass shim between the back of the collar and the central body to a depth of at least 1". I think that assures it couldn't be swaged? Not that it wasn't a reasonable suggestion.

Grindstone Cowboy27/01/2022 00:25:53
854 forum posts
64 photos

I dismantled one where the outer sleeve (the bit that is "swaged" and has the knurled rings on) came off towards the rear. If this one is the same sort of construction, you should be able to see the join just behind the part that has the teeth on that engage with the key. I think I got it off using a piece of wood as a drift.

Apologies if that's not clear, I'll try and do a drawing if it might help.


Edit - just found this video showing the type

Edited By Grindstone Cowboy on 27/01/2022 00:36:00

MikeK27/01/2022 02:27:13
226 forum posts
17 photos

I tried again with the arbor press, with a cheater pipe on the handle, and my 170 lbs bouncing on it. No luck. It's "buy a new one" time.

old mart27/01/2022 20:14:04
3717 forum posts
233 photos

If you intend to scrap it, please grind or file a bit out of that "swaged" end to put us out of our misery.

MikeK27/01/2022 20:27:20
226 forum posts
17 photos


Grindstone Cowboy30/01/2022 23:41:40
854 forum posts
64 photos

So it's not like in the video I linked to?


MikeK31/01/2022 00:27:19
226 forum posts
17 photos
Posted by Grindstone Cowboy on 30/01/2022 23:41:40:

So it's not like in the video I linked to?


Hi Rob. Yes, not like in the video you linked, but is like in the video Neil linked. Not only is the entire collar hardened, but the center body has a larger OD at the back than the front so it can only come out by pushing the front of the body rearwards.

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