I was the lucky bidder on a five foot Bush Hog flail mower a couple weeks ago. Well, I got it up and running today and found out why. The main shaft is bent. It looks to be about a quarter inch out by eye. The shaft is about66 inches long and hollow (like an auto drive shaft) It has to run between 21 and 22 hundred RPM. I haven't got the tooling to straighten it myself, so I'll take it to somebody. Does anyone have any idea what the "straightrness" has to be for this thing to be vibration free at speed? Within .005" ? .001"
Thanks for any opinions
Also, anybody with experience with flail mowers have any operating and maintenence hints ( apart from "don't hit big hard stuff.").
This machine looks like it ought to have wheels on the front edge to set the cutting height. John