First you need an Operator Manual for your tractor, and need to read it. Look to see what speed the rated torque is. Next see what speed yields 540 PTO RPM. Most medium size tractors can be run at the 540 PTO RPM speed to achieve good torgue, very little lugging, not over-reving, and decent fuel usage. I would never run my tractor by pulling the throttle wide open, as it goes way beyond the rated RPMs and the "540 PTO RPMs. I also would not load my tractor up pulling an implement and run it at half throttle in a higher gear with the expectations of saving anything. Remember it is not only how much fuel it burns, but how long between overhauls, maintenance, etc that makes up total cost to operate. Also, I say run the RPMs up to 2000, then start off and watch the RPMs. A drop of about a few percentage points under load is to be expected. But if my plow pulls the RPMs down to below 1800, then I am on the draft control changing the setting a bit. I really like to see it pull down from 2000 without load to about 1875 when pulling a full load. Pulling it lower is lugging it, and not pulling the speed down to that level is wasting power and fuel. Tom
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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