I guess I joined at the right time. This was one of my big questions. I have a 4310 430FEL w/mowing and scraping attachments, but doing several hours of FEL made me a little loopy. I was working in the dark and the air was pretty still. It was a large outisde area, but evidently 2 hours of driving right through the fumes and moveing about 16yds of 1.5" rock = bad health conditions.
I'm ordering the part asap.