Never had a mishap except for the time I busted out a windshield in a 4400. On a 4420, jamming the feederhouse a few times, wrapping the unloading augur around a big oak tree (tree disappeared next summer),breaking off all the pegs on the horizonal augur on the grain table. It tried to eat a big branch. On a 6620, engine was running rough. I looked down on the gauges, the water temp. gauge was pegged in the red. Rotating screen got plugged on the radiator fan!