John C.
Senior Member
If you can't find a nitrogen spec anywhere I'd start at around 180-200 PSI. Too low nitrogen charge it will hit light/fast. Too high it will hit slow or not at all, depending on what your relief is set at. The nitrogen is what gets compressed by the piston and gives it the force to hammer into the toolbit.
Looks almost identical to a brand I deal with quite often and they're spec'd anywhere from 230-250 PSI depending on size. Better to start a little low and see how it works first.
I've always treated the nitrogen charge a nothing but a spring for the hammer inside the breaker to rebound on. The power in the hammer was due to the flow and pressure from hydraulic system.