Yes, there would no doubt be some difference between an Ind PTO and a dry clutch PTO. The independant PTO has a heavy clutch housing, dragging in oil all the time so it would probably drag a small amount more. The other factor is the actual gearing that transmits power from the engine to the output shaft. Some tractors have a straight through design in the top shaft of the transmission and then step down at the rear of the tractor. Others step down in the front of the transmission. Perhaps some more are a straight drive from the engine right out the back... but I'm not sure about that. All of those designs will have a varying degree of loss. As an example, the old Fords would lose probably about 8-10 hp from the engine's gross through to the PTO. The newer, larger tractors would lose closer to 20 through their drivetrain. Two different designs; two differing amounts of parasitic loss.
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Today's Featured Article - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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