Question about Bosch 11247 Factory Reconditioned 1 - 9/16" Spline Drive Rotary Hammer

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Bosch 11247 Hammer drill works in drill mode but in hammer mode it spins as drill but does not hammer. Also how can I remove drive shaft from housing?

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Usually replacing the o-rings on the piston, striker and Impact bolt will solve any hammering issues. That is considering there is no damage to the mechanical parts in the hammer mechanism.

Posted on Apr 13, 2009

  • Corey McConnell
    Corey McConnell Apr 13, 2009

    Usually replacing the o-rings on the piston, striker and Impact bolt will solve any hammering issues. That is considering there is no damage to the mechanical parts in the hammer mechanism.

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SAME ISSUE *****SOLVED*****

You were on the right track but needed to go farther with top description without disassembly!!

I have a barely used Hammer drill also that will rotate and run motor but does not hammer in any position.

Grease is the issue.....

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GREASE, GREASE & MORE GREASE....

REMOVE BIT....SQUIRT IN ALOT OF THE BOSCH GREASE HOLD LOCKING CHUCK OPEN. INSERT A SPLINED BIT INTO THE HOLE AND PLUNGE GREASE IN SLOWLY SEVERAL TIMES. REMOVE BIT & REFILL GREASE & REPEAT.....VOILA.....HAMMER WORKING AGAIN....

BE SURE TO USE LOTS OF GREASE & DUST COVERS ON Bosch HD WHEN WORKING. WE ALL ERROR AND FAIL TO MAINTAIN FROM TIME TO TIME!
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Bosch 11247 wont hammer


hola le hace falta aceite a los engranes por eso no golpea puedes usar aceite para transmision

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