40 series Cvt help

Master Hack

Master Hack

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I have done a similar project, with a transaxle from a mower. The project is a utility kart for hauling tools and things around the vast MTL campus.
I only get about 10-12 mph tops. The hydrostatic trans from a mower is not made for high speeds. Despite what your calculations say, l don't believe you will ever see 37MPH. Nobody builds a 37 MPH mower. Mowers are designedt a to deliver smooth power @ 2-3 MPH. Your results may vary, however.
I could be wrong, but that is my conclusion. I didexperiment with gearing also.
21,6:1 gearingshou be a clue. Good luck! I can share my (long) joutney to success if a want.
ls it a vertical input shaft?
 
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Master Hack said:
I have done a similar project, with a transaxle from a mower. The project is a utility kart for hauling tools and things around the vast MTL campus.
I only get about 10-12 mph tops. The hydrostatic trans from a mower is not made for high speeds. Despite what your calculations say, l don't believe you will ever see 37MPH. Nobody builds a 37 MPH mower. Mowers are designedt a to deliver smooth power @ 2-3 MPH. Your results may vary, however.
I could be wrong, but that is my conclusion. I didexperiment with gearing also.
21,6:1 gearingshou be a clue. Good luck! I can share my (long) joutney to success if a want.
ls it a vertical input shaft?
Click to expand...
It’s not hydro static though
 
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with the little room and a ton of gear reduction I have I think this is my best possible set up. It shifts fine in the air but not under load rolling on the ground both WOT. People and calculators say the transaxle is like 21-1 but when I turn the the input shaft to wheel turn it’s 12-1 which again is in the air so idk if that’s wrong. The picture from the Cvt I bought has the pulleys oriented this way but everyone says it won’t work and I haven’t found a single person run it this way but again it works in the air just not under load. If anyone sees something I don’t let me know lol but so far the Cvt won’t shift but it does do 10 and climb hills so ehh maybe good enough View attachment IMG_7326.jpegIMG_7338.jpeg
 
Edwin Spangler

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Something else you may want to consider. We have abandoned this project because the trans cant handle these speeds and it looks like we have the same trans. I think mine just has that goofy MTD CVT on top. We blew the first trans really fast because I didnt switch out the gear grease for gear oil and the second one lasted maybe 5-6 hours of riding with proper lubrication.

You may want to consider another project or be content with the speeds youre getting now. Reliability drops off exponentially the faster you move these transmissions.
 
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Edwin Spangler said:
Something else you may want to consider. We have abandoned this project because the trans cant handle these speeds and it looks like we have the same trans. I think mine just has that goofy MTD CVT on top. We blew the first trans really fast because I didnt switch out the gear grease for gear oil and the second one lasted maybe 5-6 hours of riding with proper lubrication.

You may want to consider another project or be content with the speeds youre getting now. Reliability drops off exponentially the faster you move these transmissions.
Click to expand...
Okay thank you, yeah I heard most people will switch out the internals for chain drive and loose the nuetral and reverse part. Do you know the set up you had on there maybe it’s something I can go off of?
 
Master Hack

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Edwin Spangler said:
You could simply look up the specs of a Craftsman t1000 (consider the fact that I swapped a 14" pully onto the shaft, used a bit longer belt, connected the throttle to the Gov, upgraded the carb a bit) and stop your silliness from showing.
Click to expand...
Well, we were talking stock mowers.
you apparantly are talking a modded machine.
I really don't care enough either way to look it up. I was referring to hydrostatic transaxles at which point it wasn't clear what type of TA was being used.
I stand by my statement " nobody makes a 37mph mower." Modded shyt is a horsepower of a different color.
 
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Edwin Spangler

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Lol sorry, of course I wasnt saying a stock mower goes 37. I read it as, "nobody can modify a mower to go that fast".

I just thought you were jokingly fishing for proof...
 
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Kinda off topic but people definitely get 35-40 out of any mower with a geared rear end like a John deer 111, pulley swap big front small back and no other mods
Edwin Spangler said:
Lol sorry, of course I wasnt saying a stock mower goes 37. I read it as, "nobody can modify a mower to go that fast".

I just thought you were jokingly fishing for proof...
Click to expand...
 
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Denny said:
One of those clutches needs to be flipped over.
Click to expand...
View attachment IMG_7341.jpegstill wondering if you can explain to me why I have to flip so I can understand better how this works, I see the shoes on the driven look like they might be going against the belt when being turned would that be enough to stop it from shifting? Also i understand that when the pulleys open the belt will be out of line but that’s just bad for wear as far as I can tell
 
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Looking at post # 27, a catalog picture I presume, but then your attachment looks like it is just mounted in exactly the same orientation. So far so good. Here's the important part. Looking at the catalog view, if the pullies are turning clock wise everything is good. If it's counter clock wise, then a reverse wound spring is needed. From your shot of underneath the tractor, I have no clue to which way they are turning. It is the orientation of the cams or points of the outer sheeve on the driven to the plastic stops. You have to be turning the cams away from the stops. If it is turning into the stops it won't function properly. You either put in the reverse wound spring ( which will place the cams ) on the opposite side of the stops. Or if you have the room and shaft length, you can flip the driven 180 degrees so that it is spinning in the opposite direction. Usually it's easier to swap out the spring. OMB Warehouse stocks them and they are about $15.
 
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panchothedog

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Hadn't seen your post # 20. As pictured and assuming on a horizontal shaft engine turning counter clock wise ( pushing the kart forward ) that will not work, for the same reason that I explained it the previous post.
 
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