Drawbar pulling force has very little to do with the engine's horsepower. Given enough weight for traction, suitable tires to put the force to the ground, and low enough gearing even a small, low-powered engine can pull a huge load. The problem is that it won't be able to do it very fast. A good example is an electric winch that can pull 10000+ pounds with a motor with just a couple of horsepower. In order to pull a certain load at a certain speed, however, requires a certain amount of engine horsepower. A tractor is designed to provide drawbar pulling force at relatively low ground speeds so as a result the needed engine power is also relatively low. On the other hand, road-going vehicles are expected to maintain speed up hills at 70-80 mph which requires quite a bit of power. This large amount of engine power, though, doesn't mean the truck will pull like a tractor at low speeds because it won't be able to get enough traction to make anywhere near full use of the engine's potential. An engine is only making full power at wide open throttle with the engine at the rated speed which for a car or pickup very rarely occurs in normal use. On the other hand, a tractor engine is designed to produce full rated power non-stop for hours on end. To allow for this type of usage the tractor engine runs at far lower speeds which limits the amount of power it can produce.
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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