What are the possible cause of frequent broken bolt (the main four bolt that hold the cylinder, lower and upper part). It is a F35 furukawa breaker, mount on PC 300-6. FLow to breaker is 210 LPM and working pressure 180bar. N2 charging pressure standard values. The bpm seems low, almost 280bpm, while it should be around 350bpm to 400bpm at max stroke adjustment. By the way I did two turns counterclockwise on the stroke adjusting screw and the bpm didnt increase. Could it be the control valve the one mount on the body of the breaker that makes this trouble
Photos would help
If that's the rod bolts that are breaking, my NPK and Stanley hammers have different torqueing instructions. My old Stanley MB1950 required the tie rod bolt to be red hot during tightening to achieve proper clamping force and prevent breakage. My NPK were light torque followed by degree turning. In my limited hammer experience, tie rods break from improper torqueing.
That's the most likely cause. Those bolts have to be torqued to an (as much as can be) exact spec.
Yes I am talking about tie rod bolts. I do not have photos available now. I gonna start with tightening torque as specified in the manual and will see the result later on. Thanks for the reply
Yes, and I forgot to add, undertorqued tie rods are more prone, than overtorqued tie rods, to breakage, at least in my experience.
It's not only over/under torqued, but also it's imperative they are torqued equally, again, as close as one can to that exact spec recommended by the mfg
If you pry with the hammer like a ripper that will break bolts it will also stretch them before they break Hammers will not tolerate abuse when used correctly they hold up pretty well My experience is limited to npk mainly but the principle is pretty standard