Question about Bosch 1199VSR 8.5 Amp 1/2 Inch Hammer Drill

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Bosch VSR 1199 hammer drill keeps slipping in hammer mode

My 4 yr. old Bosch VSR 1199 hammer drill started slipping when I'm using it in hammer mode to drill 3/16" Tapcon holes in concrete. What part do you think I should look at when I disassemble it? I found the whole parts diagram online ( http://www.ereplacementparts.com/bosch-1199vsr-electric-drill-parts-c-128_1010_4165.html ) , and it looks like most parts are available. I am very handy at repairing my own tools. Just haven't had a chance to look at this one yet. Thanks, Marc P. Auburn,NY jakob0522@verizon.net

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  • Anonymous May 08, 2009

    mine started slipping in concrete after drilling ~ 6 1/2" holes, but also has it in normal mode. my cheapy battery roybi has more torque at this point. I can stop the chuck on the bosch with a firm grip now...

  • Corey McConnell
    Corey McConnell May 11, 2010

    Does it only slip in hammer mode?

  • David Ford
    David Ford May 11, 2010

    That is a loaded question, you should inspect all the parts but if it is slipping I would look at the gearing and drive assembly. Does the motor make a grinding sound that is louder in reverse or forward, if so the armature and the gear that it drives should be especially looked at. I would recommend cleaning all parts and a close inspection will show the problem. Let me know

  • Roger Camacho
    Roger Camacho Oct 12, 2013

    Shaun what is the part number my drill is doing the same exact thing.

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  • 79 Answers

Inside there is a little plastic shaft, where the selector hooks to. They have had problems over the years stripping. Replacement part is still plastic. Yay! You may need a bearing puller or find some way to get the clutch off the shaft. Lemme know. Please rate me

Posted on Jun 18, 2009

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