Today has been another almost day long battle with this piece of crap New Holland chopper. But I've finally found what most, but not all our problem has been. I found the rotary knives that cut the corn off were adjusted wrong. Got it adjusted & tightened as tight as I could get it, then I took over chopping for a while. Chopped perfect for 4 loads, then started jamming with grass again. Got out & checked, and yep, the bolt loosened that held the offending knife. So I bring the tractor & chopper back to the shop & remove the knife. The plate the knife bolts to is cracked all the way around, just floating on it's hub, but not to where it can come off. I pressed it tight together & welded with 7018 on both sides, as it was only welded on one side. I called it a day on the chopper, as now I have to milk tonight. Another 13+ hour day of battle. If when I bolt up the blade I find it is true after welding, then I'll red Loctite the bolt & put the torque to it. Then once we resume chopping Monday, I'll just take my long strongarm with 15/16" socket, and just keep checking to see it stays tight. I'm gonna be writing me a letter to New Holland to tell them what I think about this 790 chopper, and it won't be pretty, but it will be honest & to the point. Our old New Holland was way better than this one, and we spent like 25 grand thinking it would make life easier for us...........HA HA!