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PostPosted: Fri Jul 28, 2017 11:49 am 
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Hi, I bought a 2nd hand SDS max drill from ebay that was sold as spare/repair - as seller said the drill works OK but bit keeps falling out of chuck - so it's a faulty chuck issue.

I've removed the rubber cast from chuck and can see why this is the case - both ball bearings are missing - hence nothing to hold the bit.

Question is what's the size of these ball bearings? I can see on ebay a 7mm ball for 'dewalt sds plus' chuck - but this is sds max hence I'm not too sure...

Would appreciate help

Cheers
Namo Amituofo


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PostPosted: Wed Dec 20, 2017 1:15 am 
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did you find out the answer? (i have the same issue)

I guess the solution is to measure the groove width on an sds max drill bit.. the ball should fit snugly within that.
That's my next step anyway.


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PostPosted: Wed Dec 20, 2017 10:26 am 
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Have a look at this video https://www.youtube.com/v/0USNsXPpNe4 It will give you an idea of sourcing the correct ball bearing or indeed a repair kit if it is a mainstream manufacturer.

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PostPosted: Fri Jan 26, 2018 3:03 am 
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I tried to watch from australia but got 'This video contains content from MrToolstop. It is not available in your country.'

Nevermind tho, I bought a couple of different ball bearing sizes direct from china.. so one of them will fit. cost me a dollar.


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