Posted by LenNH on October 01, 2008 at 08:15:12 from (24.61.134.129):
In Reply to: F-12 tranmisson posted by mhorn on September 26, 2008 at 11:22:48:
The original specs for F-12 on STEEL said 4 MPH for third gear. On 40" rubber, I believe the speeds should be about the same as the original 54" steel wheels. On 36" rubber (fairly common in the early days of putting rubber on these tractors), third would be a bit slower. I spent years and years and years on three F-12s with the standard transmission, and I can tell you that (I'm 5" 7") I could walk behind the tractors at a fast walk. I never tried this behind a tractor with the 7 mph third gear, but I think it would require a good jog to keep up with one. The normal third gear feels pretty slow. The 7 mph speed is calculated at full-load rpm, so probably at idle speed the tractor would be a little faster--maybe 8 mph. Even 8 mph sitting up there in the open feels "fast" compared to the original speeds. I now have a more modern tractor that will do about 8 mph in one of its top gears, and it definitely feels like you're moving over the ground--I can even feel the wind in my face! Sorry this is so vague. If there are other tractors to compare with, you can run yours along side these (and probably a number of others--most tractors from the thirties had working speeds of 3 and 4 mph or thereabouts): Farmall A, third gear is just under 5 mph. Farmall F-20, third gear on 36" rubber is probably about 4.5 mph. Farmall H, third gear is just over 4 mph.
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