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Dan: You are not getting a lot of information are you. What size is your forage harvester? You may be just as well off with tractor bogging down a bit. I used a 560D for quite a few years on a NH Super 717 and later on NH 770. I had my 560D set at 90 hp, by an IH technicion. At one point we did have it over 100 hp, but decided to cut it to 90 hp. That was done at about 800 hours on tractor. I operated that tractor at 90 hp for 17 years and 11,000 hours. In 1975 I purchased a 1066, and operated it on the 770 harvester one season. What my operator did notice was tractor tach would remain constant, while he could hear the harvester slowing down. Two possibilities; pto was slipping or harvester was slipping. My firm belief is you can not transmit a lot over 100 hp through 540 pto. I traded my NH 770 harvester for a NH 890 (1000 rpm only) and problem was gone. As you may know the NH 890 is rated for 200 hp. My point is, it doesn't matter how high the hp gets you will always have bogging down on a forage harvester. The beauty or a Farmall is, all you need is the TA. Most other tractors require 3 or 4 shifts. Unless your harvester is rated to take it and is 1000 rpm take off, I wouldn't touch a thing. Another word on bogging down. I have seen my 1066 with the NH 890 harvester, two row corn head, corn two feet above tractor cab, and running in 4th-low and high on TA, and never bog down. My operator kept the kinves sharp enough to shave with, and shear bar to match. He did say he could go faster but what point, the haulers can't keep up. You let the 890 get dull and it will bog 1066 or any other tractor down.
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