Farmall Super MTA speed

1951G

Member
Does anyone know how to reduce the slow speed on a Super MTA to be slower than the factory? The reason I ask is because I've seen one at a tractor show that beats everyone else at the slow race and wonder how they do it? You can barely see the wheels move due to it being gear so slow.

Thanks.
 
There was a "low low" speed first gear option available for the SMTA. It used smaller countershaft and larger mainshaft gears and resulted in 1st gear being about 15% slower than regular 1st gear.

Good chance the slow SMTA you saw has this option. If it came from the factory with the low speed 1st, the tractor serial # should show an "M" suffix.
 
Ring and pinion from a 560 and the lowest speed first gear from a 560. They had 2 different first gear sets available. One was called high speed first and reverse. Can also use low profile tires.
 
BobM,

Thanks for the reply. I'm guessing these are probably either rare or hard to find parts to put in my SMTA?
 
D Slater,

Thanks for the reply. If I went with the 560 gears, do you think they'd gear it as low as the ones Bob M is talking about in another reply?
 
Caterpillar Guy,

Thanks for your reply and suggestions. I'll definitely check on getting smaller tires and do some carb work on mine.
 
SMTA only had one set of gears, think Bob is thinking of a regular SM. In low t/a with 14.9 tires and 560 gears a SMTA speed is about 1.2 miles an hour at 1450 RPM. Never checked idle speed before but with lower height tires and a slow idle it would be pretty slow. Ring and pinion for a F-560 is a 15 tooth driving a 49, 3.26 to one. SMTA is a 19 driving a 50, 2.63 to one. Low speed first for a F-560 is a 19 tooth driving a 54, 2.84 to one. SMTA or high speed first in a 560 is a 21 tooth driving a 52, 2.476 to one. Have to use the reverse idler that goes with the low gear set. Ring and pinion change will lower tractor top speed and hurt field speeds if used for work. Installing the faster speed 560 third and fourth helps mid speeds with the 560 ring and pinion.
Think you could beat the SMTA slow speeds above with a F-504 ring and pinion and a 504 slow speed first in a 300 or 350.
 
Thanks for that information. I'll have to see if I can find some parts tractors based on the models you recommended. If you don't mind, could you send me your phone number to my email? I know I've got some other questions I'd like to discuss with you on the phone.

Thanks
 
With all due respect, my early production (S/N up to 60000) SMTA parts catalog shows two 1st gear sets for the transmission - a standard and a "low low".

The standard sliding gear has 44 teeth; the "low low" 49 teeth. (It doesn't state the teeth count for the mating countershaft gears)
 
Make sure the parts book doesn't show a transmission for SM tractors serial numbers F-501 to F-52627 and L-500001 to L-512541 that uses the gear set you mention. They use a counter shaft with the low low first gear made on the counter shaft. Rest of gears and the standard low is keyed to counter shaft. SMTA or SM tractors serial 60001 up use a hollow splined counter shaft so a IPTO drive shaft can pass through it if used. Tractors serial number 60001 to 80523 use a completely different thing than countershaft used for SM tractors below 60001 and above five numbers long. SMTA or tractors 60001 to 83523 use a main shaft for sliding gears different than the regular SM tractors. Early SM parts books don't have tractors 60001 to 83523 in them.
 
(quoted from post at 01:40:30 05/11/18) Does anyone know how to reduce the slow speed on a Super MTA to be slower than the factory? The reason I ask is because I've seen one at a tractor show that beats everyone else at the slow race and wonder how they do it? You can barely see the wheels move due to it being gear so slow.

Thanks.

Just for the slow race, you can get your slow idle speed down quite a bit by retarding the timing to where it'll just keep running and not stall out. I used to do this with my H.
 

We can figure out how to make them go slow, but how do you make them go slow AND keep the engine RPMs up for enough power? It would be really handy for doing loader work.
 

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