Question about Bosch SDS-plus BULLDOG Xtreme Rotary Hammer 11255VSR

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Hammer action power there but weak

Bosch xcel pbh corded drill. hammer action power there but weak drills power is weak

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  • gobbins123 Feb 07, 2010

    bosch 220re corded drill as lost its power when i put it on hammer action it will not go through the wall it is spinning slow and seems weak

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Bosch makes a special grease that is actually a mulit-viscosity oil thats a gel at room temp. At high temp it becomes liquid oil that lubes the gearcase and when the tool has cooled off it reverts back to a gel for containment purposes. If you use any other type of grease on these tools it will appear as if it is losing power, when it is actually being "bogged" down by conventional grease. The proper grease is Bosch part# 1 615 430 001-000. Retail price should be around $20 for a 225ml tube.

Posted on Mar 01, 2011

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It is hard to understand what you are asking, however I have found that with the SDS drills one does NOT want to crowd them but just let the tool work with light pressure...

Posted on Feb 07, 2010

  • Fred Yearian Feb 07, 2010

    I have had trouble with a Bosch 1194A hammer drill. The brushes fail with only a little use. Look for excess sparking at the brushes. If you have that, then you either have bad brushes or a bad armature. If no arcing is observed, then the trigger throttle control is probably bad.



    In any case, servicing is required.

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1 Answer

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try to figure out how the switch operation mode works and put back together right.

bye savumihai71

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