Soooooo as I continue to go down the rabbit hole On possible ideas for my poulan garden tractor I have A borderline crazy idea I understand it would involve fab work But would be very cool if it worked so hear me out.....
A 3 cyl or 2 cyl Diesel (likely a 3 unless a 2 cyl would Have enough power)
Take a fwd manual trans out of a geo metro, mount it to The diesel run the cv axles to atv differentials in front and Rear, then use atv cv axles to take power to the wheels
And seeing as you are running atv cv's use atv brakes!
This would not only give off road torque and power but Fix the braking issues we all fight with
I need to draw this out but in my head it looks good
Feedback is appreciated
TechnoChicken likes this post
2018 Build-Off Entrant
2018 Build-Off Entrant
Age : 21 Join date : 2016-10-29 Points : 6206 Posts : 3403 Location : Lewisburg, KY
That would probably work, although it would make a fairly large machine compared with a stock sized lawn tractor. I have thought about the best way to make a 4wd tractor for awhile, and I do think ATV front axles and possibly hubs would be the best way to do that part at least.
While any size machine is ok as it just depends what you want to build, I have always had my own "rules" or idea of what guidelines I would want to follow to build one in 4wd. Personally, I would like to make one which somewhat follows the lines of most other 2wd tractors people build. For the most part we use bigger wheels and they end up wider than stock, but nothing too crazy as far as really wide suspensions ect. With the exception of those couple people who have built snowmobile powered tractors. But they are getting farther away from actual tractor parts and more or less just using the tractor hood and fenders on a tube chassis.
The all wheel steer transaxle route has been tried a couple times by people, but the AWS knuckles are a bit on the fragile side, and the ones I saw didn't have much if any front axle toggle, so with a solid 4 wheels, one wheel is always off the ground and it sort of canceled out the 4wd effect. Also, a complete extra transmission is heavy.
What I would do myself is this: Start with a normal tractor layout and frame, at least some kind of stock transaxle. Maybe an older one like a wheel horse transmission or sears 633a. Use ATV parts up front. Might have to shorten the axles a bit to keep things as narrow as possible. Then lock the rear end and run a chain sprocket off one side of the rear axle. May need a jackshaft or two in order to route power up to the front axle. Either you have a belt you engage somewhere to connect them when you want 4wd, or you just have it full time 4wd. You would lose a few hp in the transfer up there, but it would work and you'd have a small compact system. Only thing would be to make sure your gearing stays close so that nothing binds up. But you could work that part out. It sounds like a super heavy deal, but I think it would actually be lighter and more rugged than using a second lawn tractor trans.
The geo transmission would work too I'm sure, but you'd need some (somewhat) oddly shaped brackets and things to hold everything, and it would need some fabbed up connections, such as some kind of way to adapt a pulley on the geo input shaft. I suppose you could just weld a hub on there permanently as the transmission would probably hold up fine. There's probably lots of ways to do it. I would just like to find a light weight way of doing it.