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want to change 1st gear to make tractor go slow

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Farmall Bob
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PostPosted: Wed Oct 02, 2013 3:56 am    Post subject: want to change 1st gear to make tractor go slow Reply to specific post Reply with quote

Want to be able to use a roto tiller on my Farmall C
any information much appreciated thank you.
Bob
 
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mkirsch
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PostPosted: Wed Oct 02, 2013 5:30 am    Post subject: Re: want to change 1st gear to make tractor go slow Reply to specific post Reply with quote

There isn't a 1st gear ratio slow enough to rototill with a Farmall C.

Even if you made up a set of custom gears, with the smallest input gear possible and the biggest output gear possible, for the slowest possible speed, it will still be too fast.

There just isn't enough room between the transmission's main shaft and counter shaft to get a super-slow gear ratio.

You could put a gearbox in between the engine and transmission to slow it down, but you will also slow down the PTO speed so the rototiller won't work right.

The only way I can think of to get a slow enough speed would be to use hydraulic motors to turn the rear wheels of the tractor, chain-drive. Leave the transmission in neutral, and just let the PTO run the rototiller.
 
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ss55
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PostPosted: Wed Oct 02, 2013 6:29 am    Post subject: Re: want to change 1st gear to make tractor go slow Reply to specific post Reply with quote

Add an auxilary engine to power the roto-tiller and drive the C at idle? That might still be too fast. Hire someone to do the roto-tilling for you?
 
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gene bender
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PostPosted: Wed Oct 02, 2013 6:39 am    Post subject: Re: want to change 1st gear to make tractor go slow Reply to specific post Reply with quote

Easiest way is power the tiller with an aux engine that way you can go slow enough with groundspeed
 
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IH fan
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PostPosted: Wed Oct 02, 2013 7:36 am    Post subject: Re: want to change 1st gear to make tractor go slow Reply to specific post Reply with quote

Ya' can't do everything with these old tractors, no matter how much you want to.
 
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mkirsch
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PostPosted: Wed Oct 02, 2013 12:41 pm    Post subject: Re: want to change 1st gear to make tractor go slow Reply to specific post Reply with quote

Unless you're rototilling loose stone-free ground, your ground speed needs to be about "95-year-old man shuffle."

A C, at idle, is still a modest walking pace. At idle, it will not have enough power to run the tiller, and won't run the tiller fast enough to do anything useful anyway.

If you're dead set on rototilling with a C, you're going to have to think way out of the box to make it work.
 
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glennster
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PostPosted: Wed Oct 02, 2013 1:17 pm    Post subject: Re: want to change 1st gear to make tractor go slow Reply to specific post Reply with quote

other option is to hook the tiller up to the c, leave it in neutral and tow the c with either another tractor or a gator. have swmbo drive the gator.
 
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caterpillar guy
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PostPosted: Wed Oct 02, 2013 6:10 pm    Post subject: Re: want to change 1st gear to make tractor go slow Reply to specific post Reply with quote

Put smaller tires on it. That will slow it down. I don't know if it would be enough. It has 36's on now right. If you put 24's on it would slow you down probably about a 1/3-1/2 of normal speed.
 
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rdpavlis
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PostPosted: Wed Oct 02, 2013 7:19 pm    Post subject: Re: want to change 1st gear to make tractor go slow Reply to specific post Reply with quote

I have a 6 foot rototiller on my Super H. I have done a lot of rototilling with mine. The ground speed is too fast for doing a single pass, but if you make a second pass on soil that has been previously worked up or multiple passes on sod it works fine. So even if you make multiple passes it doesn't take any longer to work up the ground than if you go at a super slow speed. Roger
 
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Farmall Bob
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PostPosted: Thu Oct 03, 2013 1:59 am    Post subject: Re: want to change 1st gear to make tractor go slow Reply to specific post Reply with quote

OK, Thank gentlemen. As a gear and transmission person I thought somehow I was going to get inside of the transmission and change things around. Like the ones the UK people have in the Farmall 275?
 
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LMack
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PostPosted: Thu Oct 03, 2013 8:22 am    Post subject: Re: want to change 1st gear to make tractor go slow Reply to specific post Reply with quote

C=Pi x D or the circumference length is equal to Pi times the diameter. If you reduce the diameter from 3' to 2' the change in the wheel circumference is directly proportional or 2/3. So the speed would be reduced to 2/3's or 67% (from 3 mph to 2 mph as an example) and it would be a machine shop job to get it done. If this is what you need get another tractor with a low speed. These old Farmalls do not do everything and we did not try to make them back in the day.
 
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mkirsch
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PostPosted: Thu Oct 03, 2013 12:26 pm    Post subject: Re: want to change 1st gear to make tractor go slow Reply to specific post Reply with quote

The International B275?

The B275 has a "constant running PTO." In other words, live PTO. A Farmall C does not have live PTO.

If a Farmall C had live PTO, you could put some sort of reduction gear in between the engine and transmission to get an effective creeper gear for rototilling.

Live PTO has a separate shaft connected directly from the engine to the PTO, bypassing the transmission, so it will run at the same speed no matter what the transmission input shaft speed is.

On a Farmall C, the PTO is driven off the transmission input shaft. If you reduce the RPMs on the input shaft, you reduce the RPMs of the PTO, rendering it useless.
 
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Farmall Bob
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PostPosted: Thu Oct 03, 2013 1:09 pm    Post subject: Re: want to change 1st gear to make tractor go slow Reply to specific post Reply with quote

M Kirsch,

OK, That's what I wanted to know. Thank you.

Bob
 
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john *.?-!.* cub owner
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PostPosted: Thu Oct 03, 2013 7:01 pm    Post subject: Re: want to change 1st gear to make tractor go slow Reply to specific post Reply with quote

Is there any chance that Howard may have made a Despeeder (speed reducer) for it like they did for the cub?
 
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mkirsch
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PostPosted: Fri Oct 04, 2013 4:21 am    Post subject: Re: want to change 1st gear to make tractor go slow Reply to specific post Reply with quote

Boy that would be neat!

If they did, it's so extremely rare that it is unheard of, though.

Just for everyone's benefit: The Howard despeeder unit is a planetary gearbox that bolted between the differential and final drive on a Cub for the Howard Rotovator.

It would be a bit of a challenge on a C because the final drives are internal to the transmission, where on the Cub they are out at the wheels. There's no place to conveniently put anything "between" on a C.

I'm sure if someone put their mind to it they could build an axle housing with a built-in gear reduction, but by the time all is said and done, they'd have more into it than a good used compact tractor with hydrostatic drive would cost. It would have to be someone with lots of time on their hands, skill/talent out their wazoo, and a real passion for machine work.
 
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