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Waylon49

Bosch Rh540s 1-9/16 In. Spline Combination Rotary Hammer only works upside down

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I recently bought a Bosch RH540s  Spline Combination Rotary Hammer. The Jack hammer function isn't working properly. The jack hammer function only works when I hold the Jack hammer upside down. It stops working as soon as I point the hammer to the ground to break up something.  I suspect that it may be an O-ring and am trying to disassemble the machine to find out. The problem that I'm having is that I can't figure out how to remove the tool holder. Does anyone have another reason why the jackhammer would only work upside down or know how to remove the tool holder?

 

It would also be helpful if I could find a repair manual, video, or a website that shows me ho to completely take the tool apart.

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