Posted by LenNH on January 14, 2009 at 18:12:34 from (71.235.191.159):
In Reply to: Road Gear on F Series posted by Tom Stork on January 14, 2009 at 10:24:30:
After rubber tires became common on tractors, IHC offered high-speed gears for all the F-series. It is true that 7 or 8 mph is not very fast compared to some other tractors, like the H and M, but I can tell you something from my experience. I always thought the H and M were too fast for a tricycle-type tractor. There must not have been much caster or camber in those front wheels (as a writer here says about the F-20), because there was lots of side-to-side wobble of the wheels on any kind of rough surface, especially, I think, after the steering gear got worn. It was always exciting to be roaring down the road like a sports car, but when I grew up a bit and got a little wiser, it made me uneasy to go so fast with wobbly front wheels. The other factor to consider is that 8 mph is a lot more useful on a farm than the 17 or 18 that the H and M would do. The H, especially, would not pull much of anything in 5th gear down around 6 mph (approximately engine idle speed--not much torque), about the top speed on a gravel road with a loaded wagon, especially one on steel tires like a lot of people still had in the 40s. I always wished that IHC had done what Oliver and JD did--put in six gears, with one fairly fast (around 12 mph in both cases), and one just a bit slower (around 8 mph) for pulling heavy loads over country roads. Obviously, if you are going long distances with a tractor, it is nice to be able to slide along faster than 7 or 8 mph. One of the things you'd find with a 7-8 mph gear is that you could throttle it back a bit for light work at maybe 4-5 mph, not have to make so much noise, cut down on engine wear, etc. Same goes for traveling over the trails between fields.
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