Oh gosh! I remember that chart! What a goofy sense of logic. So, they read the torque as hydraulic pressure at the pto speed of 540, then they kept cranking up the pressure, and lugging down the engine and read the max pressure with the engine barely continuing to stay alive. So even if was making more pressure, it was doing it in fewer turns over time, hence could even be less horsepower, and quite possibly is. Which is why you always have to pick a standard speed to rate it at, and the manufacturers agreed, or rather the Univ. of Nebraska test lab recommended after the government decided to regulate the outrageous claims of tractor manufacturers, the standard pto of 540, and the engine speed that it takes to develop 540 rev/minute. A quick check on torque curves is to crank the pressure wheel in to get a 10% reduction in pto speed, and then see if you gained 10% on the pressure meter. If you didn't get 10%, you didn't "gain" at all.
This was not the first time I've seen a dyno operator not understand what the gauges were telling him.
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