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We have an old Roto Grind, I've rebuilt it completely. Was running yesterday and was thinking about your question. Ours is a 1090 and we run it with a 2390. First thing we do when we buy a tub grinder is extend the tub two feet, not really for extra capacity, more for controlling spillage. We are chopping greenfeed with it and you do get a bunch of long straw, we've adjusted the shear bars in but it sure makes the thing noisy but it still has decent capacity. The biggest advantage of this unit is it's simple, it has 11 bearings (not including the wheels) and around 25 big knives, all you need is a thousand RPM PTO, around 10gpm hydraulic flow and twelve volts and your chopping feed. Biggest disadvantage is it's a dusty bugger and you have people running that are a little lower on the IQ spectrum or lacking ambition they will run the tractor in the dust and plug it up in a hurry.
 
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