Combines rotors

Junkman, have good friends that did just that, went from Massey 750 to 1660 and are pleased...much more capacity...the specialty rotor only an advantage in green or tough beans and it does make a difference there...other wise for corn and small grain , especially if you want the straw,we prefer the regular rotor

I understand from one of the posts below that the rotors are the same in a tr 70 as they are in a tr99 . I would think they would have to be longer or something to handle all the material from a 12 row head. I would also think that for sure the sieves would have to be bigger to handle all that material.If the rotors are the same diameter and length in all model why not stick with a tr70IJAlso is it true that NH rotors turn much faster rpm,s than case ihIJ Doesn,t that crack grainIJ

Even though the rotors spin faster, at 17", they have a much smaller diameter so that the tip speed of the rub bars isn't much different than any other combine. For example a 30" diameter case ih rotor spinning at 500 rpm gives a tip speed of 130 feet_second. For a 17" rotor to make the same tip speed it has to spin at 883 rpm.

Big John, The rotors have plenty of capacity and thecleaning area is much larger on a TR-99. The rotors have many improvements since 1975.The rub bars hve been changed several times, lugs are used in some condtions, and other improvements too, including concave changes like a round bar concave for corn and beans. All of this requires much more HP and therefore heaver bearings, heaver belts, andall around more beef. Also remember that auger flighting, grain tank bottoms, and elevator chains wear out faster with the grain flow that is probably double that of a TR-70. The TR-99 is one "awesome machine"

tj what is the derference between rub bars and rasp type barsIJ We have a 8570, would like better baleable barley strow. We have knives on, I think 12 of, can we do with out themIJ Gleaner guy talk about the reverseable bar being bad, what are they and why are they badIJ It is thought that is what in on the new massys.

I'm trying to make a post here to explain this, but for some reason my post isn't being accepted. This is a test. If I can't post, I'll email you.

Guess this venue won't accept long posts. I'll email you. If anyone else needs the same info, I'll try to carbon copy. Have you ever felt like you're talking to yourself a little too muchIJ

looks like M Gorden got your post to go under test today. Thank for the info, it was very good and helpful. Your setup sounds like it would work for what we do, I was cutting safflower with a lot of mog on the screens. I also wounder if the searator grates are worn out ( not shor how to tell),the picture I have seen do not look like what is in this 1992 model 8570. I had soom cracking in wheat, not in barley or safflower. look like you have an opition of a fourth bar on the IH rotor, is that an opition on mf rotor tooIJ The outer edge of the sweep wear plates seem to round off in 1800-2000 acres of poor crops, is this normolIJ Thanks for your help swtvid

Yes, the 4th bar is an option on the Massey rotors, as well, and will improve the operation somewhat. I will say, however, that in most conditions it hasn't been necessary and mostly used in edible beans where vines are usually very tough or if very dry, have a tendency to break into small pieces. It might be an improvement in safflower if you're in a very dry situation where heads and stalks are breaking up badly, or in rotten straw. In an axial flow machine, badly broken up trash has to build up in a pile before the strippers can carry it up to the vanes. The extra spiral of bars carries this stuff on to the vanes without allowing it to pack. In IH machines, at least, this appears to have eliminated fires which start in the rotor cage. The wear on your sweeps sounds about normal for OEM. When we mod a rotor, we hardface these, and we don't for sure know how long this lasts, because nobody has been able to wear out a set. Wear on grates -- mainly look for roundness on the leading edge of the crossbars -- if roundness is about halfway across the top of the crossbar, they need attention. Same applies to the threshing concaves.

What part of the country do you do your testingIJ Just curious.