Re: John Deere B Top Speed

Posted by Leroy on December 28, 2013 at 07:45:28 from (69.88.207.185):

In Reply to: John Deere B Top Speed posted by Bryce Frazier on December 27, 2013 at 21:50:55:

Those speeds you see listed are for engine RPM at rated PTO speeds and if throtal stops are removed will be quite a bit faster. Then they are rated on factory size tires that in most casses are oversize that will increase the speed with some times the tires are so oversized the tractor will travel as fast in low gear as it is supposed to in second gear and then the owners complain about being too fast in low or reverce and that is where they get the way out of line top speeds as they run the engine ungoverned at absoulete top RPM they can get along with a combination of way oversized tires. That speed with the late model B is based on the 10" tire and a lot will not stop on oversizing with a 12" tire but skip the 11" and 12" and go to the 13" that is now a 14.9 tire. The earlier 6 speed Deeres were geared slower, then for 45 up to the pressed steel frame they jumped the speeds way up and got rid of the gear needed for corn picking or combining so those tractors have the extra high top speed. Then with the pressed steel frame they brought the speeds back to a more realistic speed. The Ford is rated on speed at 1,500 engine RPM for correct PTO speed but will operate at 2,000 RPM for field speeds like plowing and that is where they get the faster ground speeds, Then the overdrive transmission will increase that followed by they way oversize tires but with everything the ground speeds for the Fords of over 20 MPH are supect as that is not possible. I have had a 38A with 4 speed, 14B with 6 speed, 49 B with 6 speeds, 51 A with 6 speeds and a 50 AR with 6 speeds and 41 Ford 9N, 44 Ford 2n, both with overdrive and NAA without overdrive and I know none of them ever got close to what some say they do. 44 Ford with one size over tires, overdrive tranny and wide open will be about 15 MPH. The 41 Farmall H, 38 JD A, 49 JD B, 51 JD A, and 50 JD AR all are very close in speed in second gear that is plowing speed, The Forde are close also in second gear if the RPM is kept to PTO speed but they were usually run at wide oppen speed so the traveled in second at speed of the other tractors in 3rd.. THe 46 JD B had the high speed gears and first in it was equal to second in the 49 B.

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