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Broken keyless chuck

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Gary Wooding12/08/2021 10:44:36
872 forum posts
227 photos

The keyless drill chuck I use on my lathe suddenly decided it had had enough. I had just removed a drill and wanted to insert another, but although the sleeve turned, the jaws didn't move. I can screw the sleeve in and out about 6mm, but the jaws don't move. There's a slight grinding noise apparent when rotating the sleeve, but the jaws remain stationary. There is no maker's name visible anywhere. I've used it without problems for a number of years.

I can't see any way to open it up to determine, and hopefully rectify, the problem. Any ideas?

broken chuck.jpg

mgnbuk12/08/2021 12:20:23
1032 forum posts
69 photos

This Youtube video might offer a few hints on how to dismantle one of those.

I've only skipped through it, but brute force does not seem to be required.

Nigel B.

Ady112/08/2021 13:18:54
4728 forum posts
714 photos

utube is your pal here, someone somewhere will have done your type so hunt about

They are clever little things and well put together

I did one here and the only thing I would stress is point it up the way to get the hood off, with the body in a fixed vice and the hood being used as the "nut" part

David George 112/08/2021 13:36:17
1656 forum posts
497 photos

It looks like the outer shroud has unscrewed instead of the body rotating. Screw the shroud back on but have a look e.g. the video first. Don't forget to take pictures as you disemble it and mark parts where they come from.


Clive Foster12/08/2021 17:52:13
2836 forum posts
103 photos

As all these engineering keyless chucks are assembled in a very similar manner it's worth rooting around the internet for Albrecht service instructions. The set I found had nice exploded drawings along with some "professional" techniques and wrinkles to get it working really well. Some of the amateur write ups and YouTubes are said to be lacking that little bit extra.

Unfortunately the link I used for the Albrecht instructions is dead.


DC31k12/08/2021 19:08:13
573 forum posts
1 photos

Try these as an aperitif:

John Haine12/08/2021 20:41:59
4172 forum posts
242 photos

I am fairly certain that this has been answered previously on this forum. Use the Google search facility on the homepage. Or maybe Michael Gilligan will chime in as his search skills are excellent.

Michael Gilligan12/08/2021 23:10:56
18932 forum posts
943 photos

I don’t really do requests, John angel

But as Clive has given us a good start : **LINK**



Click on the letters SBF on the line

Repair manuals SBF

Edited By Michael Gilligan on 12/08/2021 23:18:18

Michael Gilligan16/08/2021 19:44:10
18932 forum posts
943 photos

So … did you fix it, Gary ?


peak416/08/2021 21:23:10
1487 forum posts
162 photos

These are the bearings that came out of mine.
As I recall, the rear collar unscrews as well.

ball bearings.jpg

I took it apart as it was starting to feel a bit gritty.

I also had a problem several years ago where a drill had grabbed and self tightened the chuck very tightly.
I needed some gas pliers to unscrew the front to release the drill bit as it was too tight by hand.
After that, it would only open up to abut 10mm.
Last week I took off just the front cone, jaws and the screw which moves the jaws.
Half an hour with a couple of diamond files, and all seem OK again now.


Gary Wooding17/08/2021 07:44:16
872 forum posts
227 photos

I've not managed to fix it yet. I've not even managed to dismantle any part of it. I can't extract the taper from the chuck body, and the rear collar appears to be just a cap, which also refuses to come off.

By holding the tang of the taper in a vice I'm able to app[y a powerful pipe gripper to the shroud, and have managed, little by little, to unscrew it enough to see the start of the thread. Each time I try, there is considerable internal grinding, and I'm able to unscrew it a little more, but not yet enough.

pipe grip.jpg

Michael Gilligan17/08/2021 08:36:28
18932 forum posts
943 photos


Sounds like you might have a lot of debris [previously known as balls] jamming-up the works.


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