SOURCE: Bosch 11247 Hammer drill works
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.
SOURCE: Makita HP1640 hammer drill dual mode - 2 hours
Exchanged Makita HP1640 hammer drill for a new one. The 2nd drill did the same thing in under an hour!! Will return for refund. Instructions say the Forward/Reverse switch must be in a full up or down position for the Hammer/Rotary switch to move; well, it is and the Hammer/Rotary switch still stops at a 1/2 way point between modes. Although I can still use the drill, instruction warnings say not to because it may potentially burn out the motor. I'll have to go with a different brand this 3rd time around. It seems to be a design flaw.
SOURCE: Bosch GBH 2-20 SE hammer drill stopped working
hi
check the cord and the switch to have continuity,the wires,the brushes,the rotor and stator.
regards savumihai71
SOURCE: Dewalt dw511 hammer drill won't hammer, only
The hammer inside the drill head are most likely damaged ans/or broken, it is likely the best thing to do is just replace the tool.
SOURCE: hammer drill won't hammer
Without knowing which model you have: Most Bosch hammer drills use a plastic connecting rod to attach the piston to the rotating spindle. These are a common failure item and fairly easy to replace.
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