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Old 08-08-2019, 06:45 PM   #1
bmklawt
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Default Getting my creation to go 1.5 to 3 MPH

I've built a miniature tractor, the size of a large lawnmower, for my father to putz around in at tractor shows, it has a John Deere LUC 2 cylinder motor coupled to a 3-speed model A transmission and axle.
This thing is way to fast, I've learned that a Model A goes 10 MPH in first gear, I need to get the speed down to 1.5 to 3 MPH and it does not need to go any faster than that.
Is there any kind of creeper gear I can install in the transmission or a different ring gear in the rear end, I've recently heard about a Warford underdrive, would that work, would I even be able to find one. My other thought would be to add a gear reducer or transfer case between the transmission and axle or just replace the axle with a gear reducer, but that seems like a ton of work.
Anyone have any thoughts or ideas on how to make this work.

Your help is greatly appreciated,
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Old 08-08-2019, 07:01 PM   #2
morebeer
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Default Re: Getting my creation to go 1.5 to 3 MPH

How about a block of wood under the accelerator pedal?
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Old 08-08-2019, 07:16 PM   #3
RandyinUtah
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Default Re: Getting my creation to go 1.5 to 3 MPH

You might try a model a 4 speed trans with the granny low gear also known a compound low.
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Old 08-08-2019, 07:28 PM   #4
Railcarmover
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Default Re: Getting my creation to go 1.5 to 3 MPH

put a second A trans behind the first one..two sticks,double reduction
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Old 08-08-2019, 07:29 PM   #5
Bob C
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Default Re: Getting my creation to go 1.5 to 3 MPH

What Randy said. The 4-speed is 6.4:1 in low gear and the 3-speed is 3.12:1.


Bob

Last edited by Bob C; 08-08-2019 at 07:40 PM.
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Old 08-08-2019, 08:20 PM   #6
whirnot
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Default Re: Getting my creation to go 1.5 to 3 MPH

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Originally Posted by Railcarmover View Post
put a second A trans behind the first one..two sticks,double reduction
That's a great idea. With the speeds you want just leave the second one in first gear. No shifter needed.
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Old 08-08-2019, 08:41 PM   #7
BRENT in 10-uh-C
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Default Re: Getting my creation to go 1.5 to 3 MPH

There were some 4.56 and 4.88 gear sets made for use with Economy tractors that used Model-A rear axles.
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Old 08-08-2019, 09:03 PM   #8
Kurt in NJ
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Default Re: Getting my creation to go 1.5 to 3 MPH

a Wortingtom tractor gear reducer--7-1, bolts direct to rear, not real common,probably the cheapest is another transmission
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Old 08-09-2019, 11:38 AM   #9
Jim Brierley
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Default Re: Getting my creation to go 1.5 to 3 MPH

That is a cool looking tractor, any photos of it as finished?
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Old 08-09-2019, 12:49 PM   #10
rotorwrench
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Default Re: Getting my creation to go 1.5 to 3 MPH

TT or AA truck axles were favored for doodlebugs as well as a combination of two transmissions for ones used as tractors in order to get the underdrive affect. Some just used the AA 4-speed transmission.

The little LUC engine is around 16 HP but John Deere did use them in the small model LA tractor with a draw bar rating of 10 HP. The engine was also used for industrial applications and for non pto versions of the model 12A combines.

Last edited by rotorwrench; 08-09-2019 at 01:05 PM.
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Old 08-09-2019, 07:41 PM   #11
Railcarmover
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Default Re: Getting my creation to go 1.5 to 3 MPH

Quote:
Originally Posted by whirnot View Post
That's a great idea. With the speeds you want just leave the second one in first gear. No shifter needed.
fool your friends,put both in reverse and go forward..
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Old 08-10-2019, 10:00 AM   #12
bmklawt
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Default Re: Getting my creation to go 1.5 to 3 MPH

Jim Brierley, the picture shown is as far as I've gotten so far.
If I get an AA 4-speed transmission is that a direct fit or would I need other parts as well?
I post a wanted ad and see what I can get.



Thanks much for all the input
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