That's neat!
Beautiful day for sure.  Nice farmstead. Cool old tractor "leaning into it". 
Made me remember my childhood.  My dad raised hogs when I was little.  He had a hammer mill that looked exactly like yours set up in his granary.  It blew directly into his stationary feed mixer.  I remember being out with him when he was grinding feed every week. The belt ran right about eye level to me then.  I always wanted to touch it but I know I would've got my butt warmed if I dared to.  Bucket after bucket from the grain bin into the mill.  He raised oats, barley, wheat and alflafa to grind for his hogs.
He used a John Deere A to grind feed.  It was a Korean War era tractor with a water pump and aluminum radiator...which I guess never cooled as good as the older copper ones.  He used to take the radiator cap off and let a garden hose run at a steady trickle into it to keep it cool on the hammer mill.  The hammer mill made that A snort.  I can almost still hear it popping away.