This video shows how to 'tear down' your Hitachi (or Metabo) roofing air gun, diagnose common issues and make necessary repairs in 'real time'. (Model # NV45AB2)
What about a brand new metabo NV65AH2? Right out of the box I can’t get it to fire nails and then it loses power. Only other thing I think of is that the air hose has a brass 1/4 inch universal coupler.
I think that's the siding nailer. I don't have any experience with that one but much of the internal parts would likely be similar. I'd suggest first making sure you have proper air pressure. After that, check the manual for troubleshooting tips (hopefully there are some within it)
