Yes, air filter wasn't bad, surprised me a bit. I checked that right away in the field. I did shake it out well. After the tractor cooled down Saturday night, I went back to the field and took off the radiator cap, it was full. I got it back home, and sprayed out the radiator, by garden hose, on Sunday morning. I'll run to Kubota and grab coolant today to top off the overflow reservoir.
I'm thinking it's as skipper said, I think it's tied to cutting in those dry dusty conditions. Thanks all.