Are you using an extension on the socket? Sometimes that will insert enough slack so as to defeat the impact mechanism. I've got a similar 1/2 inch and it'll take off anything I throw at it, so my large trucks wheel changes with it all the time on #4.
Oh, and my compressor is always maxed out on PSI around 140-150 unless I'm doing woodworking.
Last edited by Starbucker; 05-19-2009 at 06:03 PM.
This reply is really no help except to say when I bought my impact wrench I did a lot of reading on forums on the same subject. So many inputs were about their well rated for the task impact wrenches not doing the job.
I have the HF Earthquake with a compressor that only does about half of the required SFM at 90 psi, yet when I crank the psi to about 100, that wrench will easily take off the back axle nut and even the front sprocket nut that I COULD NOT get off with a long breaker bar.
Plus, every time I use my Earthquake, I put a drop of air tool oil in the air hole before using. Not using oil over time will reduce the motor torque.