farmall h gears

AARON ANDERSEN · Jun 9, 2012

i do quite abit of tractor pulling with my farmall h and i need to slow it down a bit.im thinking of getting a different gear and put it in the 3rd great slot,so i still have 1st and second but 3rd will be slower than 1st...any help would be appreciated. Also wahat is the valves supose to be set at? thanks aaron.

pete 23 · Jun 9, 2012

Do I understand you correctly? You want to maintain the same gear ratios you have now in first and second but make third gear slower than first. Boy, that would be a good trick and take a pretty good machinist to make you a couple of gears to do that. The gears sets on shafts are all double gears but the counter shaft gears don't match the top shaft gears for the same speed. Take a look at a cutaway of the transmission and you will see what I mean. The valve settings are .017 across the board.

sflem849 · Jun 10, 2012

Yeah, like Pete said. He is a WAY better mechanic than my and 99% of the people on the board. My basic way to describe it would be that the bottom gears are all different sizes just like the top gears. It wouldn't be easy.

Countershaft/Bottom Gears

Top Gears

Janicholson · Jun 10, 2012

I agree with Pete. If there is one thing true of Letter Series (and others) it is that it is way difficult to lower the gear ratios. Building a reduction set of gears to go into the torque tube in place of the clutch shaft. (what a TA does, but less sophisticated, and not shiftable) would be one way. The other would be to modify the output shaft to a 20% smaller pinion, and a matching ring gear with that tooth ratio. The pinion could have its teeth ground off, then new teeth hobbed into it smaller. The ring gear would need to be either a new blank machined to match, , or from Boston Gear and taylor the pinion to match the teeth on that bevel gear. Either way the ring would be thicker to allow for the geometry of the reground pinion. IIRC the first gear used on the low speed first gear transmissions have first cut into the shaft itself to get it small enough to work.
The strength requirements of any solution in front of the existing trans is much smaller than after reduction through the trans. Jim

CNKS · Jun 10, 2012

IH made a low speed first gear, there are not many left and probably weren't many to start with. You can put an ad in the classifieds and call every salvage yard you can find. Otherwise as the others have said there is no realistic way to do it. Possibly change the bull gears with a W4, but I don't remember whether that gives a faster or slower speed -- someone else can answer that.

sflem849 · Jun 10, 2012

The big problem with all of these suggestions is that he would lose his existing 1 and 2the gears.

The only other suggestion would be to buy a nine speed. They will only hold up to a hundred horse tractor from what I have heard. That and they are expensive.

Wardner · Jun 10, 2012

This would be something similar to what Jim proposed. From what I understand, this unit raises all speeds when the operating lever is moved. However, it may be possible to swap gears to lower all speeds.

Jason the Red owns this H. Search on him and you will find more pictures of the unit including some with the unit separated from the tractor.

<a href="http://s140.photobucket.com/albums/r16/Wardner/?action=view&current=Photo_110309_001.jpg" target="_blank">

Photo_110309_001.jpg" border="0" alt="Photobucket

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Wardner · Jun 10, 2012

You can't use W-4 ring and pinion gears as they will speed up all gears. You might find that parts out of something like a 504 might fit or could be modified to work. That "3rd gear slower than 1st" is too weird to contemplate though. Probably thousands of dollars to make.

You could make something like a SHTA using 300. 330, 340, 350, 460, 504, 606 rear end and TA.

SadFarmall · Jun 10, 2012

Not sure about Farmall H, but you can fit AW-7 Diesel gears to a Farmall M gearbox and get lower speeds. Probably too big to fit inside an H gearbox.
SadFarmall

sflem849 · Jun 10, 2012

(quoted from post at 18:04:33 06/10/12) Not sure about Farmall H, but you can fit AW-7 Diesel gears to a Farmall M gearbox and get lower speeds. Probably too big to fit inside an H gearbox.
SadFarmall

I assume that is your version of a W-6? Did they have an H sized version? Would it be an AW-5?

farmall h gears

AARON ANDERSEN

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pete 23

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sflem849

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Janicholson

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CNKS

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sflem849

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Wardner

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Wardner

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SadFarmall

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sflem849

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