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Minneapolis Moline Tractors Discussion Forum
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Slow speed U?

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MM ZTU

04-24-2005 11:07:22




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I saw a guy pull a MM U at a tractor pull recently that seemed to be running above rated rpm but was only clocked at 2.7 mph, and spun out. The tractor is a completely stock (old, dirty, right out of the field) '49 UTU that beat the rest of the field by at least 20ft. The 2nd place guy was driving a UB Special that powered out, clocked at 3.1 mph. This begs the question: was there a lower gear set offered for a UTU? Has anybody ever heard of a "Slow speed U", similar to a Slow speed JD A or B? If so, how could you ever tell if it had a lower gear set? Could there be a difference in parts between a UTS and a UTU that could allow a slower 1st gear? Any ideas?

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Kelvin

04-25-2005 19:37:55




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 Re: Slow speed U? in reply to MM ZTU, 04-24-2005 11:07:22  
Here's what I think, not facts:
Early MM Us had a different transmission. By my understanding the shift pattern was different and the high gear approched 18-19 mph. I think some of the intermediate gears were different from the later style transmission as well. I do not know about first gear. I do not know when the production change occurred, either.

As far as I know, MM used identical transmissions in same-year UTSs and UTUs. Only the axles were different.

That said: 2 things come to mind. Tire size and tire inflation will make a difference in ground speed, other things being equal. And also, its not unheard of for a serious puller to have custom gears made.

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F M-M

04-26-2005 20:36:10




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 Re: Slow speed U? in reply to Kelvin, 04-25-2005 19:37:55  
I have a 41 UTU with that old transmission with the different shift pattern. It goes better than 30 in road gear. Real scarry but low and especially reverse are very slow. The could have easily bolted one of these to a newer front end I beleive and that would have accounted for the slow speed. You can check the shift pattern. In the high speed old ones the pattern is 2-3-5 accross the top and the bottom is different too. I can't remember it it is R-4-1 or R-1-4. Anyway it's not R-4-3 like the later ones.

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family tradition

04-26-2005 15:21:49




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 Re: Slow speed U? in reply to Kelvin, 04-25-2005 19:37:55  
I always thought the UTS's were geared higher due to having factory 34" rubber on the rear. I pull a UTS w/ 16.9-38's and my dad has a UB w/ 18.4-38's and the UTS is faster in low gear. I still may be wrong, though.



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Kelvin

04-26-2005 19:54:26




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 Re: Slow speed U? in reply to family tradition, 04-26-2005 15:21:49  
I've never seen a UTS with factory 34" wheels. I have 3 that have 30". Two 1949s and a 1954. I did see a fairly early UTS (straight block) UTS with 38" wheels in Winston Salem a few years ago.



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UBMM

04-25-2005 11:19:05




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 Re: Slow speed U? in reply to MM ZTU, 04-24-2005 11:07:22  
There's a guy here that has two UTU's that he bought new and one is lower geared than the other.



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