Hitachi rotary hammer drill not hammering?

   / Hitachi rotary hammer drill not hammering? #1  

thetundrawolf

New member
Joined
Dec 22, 2014
Messages
5
Location
Prescott, az
Tractor
International
Hi guys,

I was on the job today with my Hitachi rotary hammer drill, chipping away some concrete.

Well it did this on the last job, too.

When I pull the trigger the motor spins fine, but when I press the chisel to the work with the motor spinning it just softly pats it, really not doing anything.

After a while, eventually with some hard pushing or smacking it into the concrete, it will begin to hammer, and then act like it should and chip concrete.

I thought it was a grease issue, and I put some automotive grease in the gearbox, because I was on a very rural job at the time and that was all they had. It worked and got me through the job, but today it took a few minutes before it began to hammer like normal.

Can anyone give me any ideas as to why it could be doing this?
 
   / Hitachi rotary hammer drill not hammering? #2  
I have a Hilti,and if I don't put a lot of down pressure on it,it will not hammer,drills fine,but hammer without pressure.
 

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