GSR 18 V-EC Chuck removal screw
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I went to remove the chuck on a GSB 18 V-EC in the normal way for a keyless chuck - open jaws, find and take out central screw, then use hex key and a hammer to unscrew the chuck...   

BUT - what I think could be the central screw head doesn't seem to have any usable drive recess?   There's a sort of flat head, and that has a small hole but the hole isn't Pozidrv, or torx - doesn't seem to have any drive slots at all.

I have tried cleaning it out with wire etc and a torx key fits in the hole and I can't feel anything in the side of the hole at all - no lugs - and I've had it from new so I know it's not been stripped.

Then I looked on another slightly older non brushless and it's the same - what could be a central screw head, but no drive recess.

Is there a special procedure for removing chucks these days - has Bosch moved on from locking screws in the middle?     Any ideas??

 
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Hello kimbl.
I don't have the GSR 18 V-EC, I still use my old GSR 18V-Li.
Looking at the parts list and exploded diagrams for each drill I think I can see your problem.
The old GSR 18V-Li diagram clearly shows the chuck and torx locking screw seperate from the gearbox - hence the chuck can be replaced - SEE HERE.
The GSR 18 V-EC diagram however shows the chuck and gearbox as one unit. The parts list doesn't list the torx screw or chuck as a spare part, only the gearbox assembly (including chuck). - SEE HERE.
I really can't think why Bosch would make the EC model without a replaceble chuck? It's a common wear point on drills, yet relatively easy and cheap to replace/repair. I hope there's a technical reason and not some cynical attempt at obsolescence!
I hope I'm wrong but the parts lists are usually a reliable indicator of what can be done.
If you registered your drill for the extended 3 year warranty and it's still covered, get Bosch to have a look at it. You can find there online repair service HERE.
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Great, thanks - that makes sense.    I'm wondering if there is now a press-fit between the chuck and gearbox shaft - it looks a bit like a pin pressed in from the front - that might expand the shaft into the body of the chuck.  Simple to manufacture and nothing to come loose later, but makes it impossible to take out.

Interestingly, the shaft actually pulls out of the gearbox fairly easily (on my drill it's come out a couple of times when pulling out big drills in wood) - replaces easily enough, but the internal spring ring doesn't resist much tension.

Using that knowledge I pulled the shaft out of the drill I was mending (same spring ring on the back end of the shaft, just pull it forwards.   That made the chuck fix fairly easy.       But this drill is actually a few years old (2.6Ah non-charge indicator battery!)  so it looks like Bosch have been doing non-replaceable chucks for a while.    Shame if you'e got a broken chuck on a good drill!