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Discussion Starter · #1 ·
I am building something stupid and fun but have run into trouble, using a bolens 750 tube frame rear end. I have it hooked up to a centrifugal clutch and jack shaft to increase the rpm to the rear, looking for speed not power. why wont this work ? I have it all hooked up and it wont drive, I had it going in reverse but as soon a I let the throttle of is skids to a stop. I am assuming this is due to the posi differential, is there a way to unhook the posi in this thing? I don't really care if I wind up with one wheel peel
 

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How about a pic so we can see a little more on what you have going on there.
 

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Most tubeframes have a nut on the left rear axle that adjusts the diff lock loosening this let's the rear end differential work while tightening makes it positive traction. I do not know why this would affect your design as without pics I cannot tell what the build is made of.
 

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I'm assuming that the clutch is disengaging when you back off the throttle?

If so that's normal for a tube frame due to the worm gear in the trans.

If the driveshaft isn't turning, the transmission will 'lock'.

That's why the tube frames have the free wheeling pin so that you can move them without the engine turning the drive shaft.
 

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The 750 tractor did not have a locking differential (a.k.a. "posi" ) transaxle.

The worm gear & worm wheel are the reason the tractor will not roll unless the transaxle input shaft is turning.

It is almost impossible to turn the worm gear by turning the worm wheel, yet the worm wheel turns easily by rotating the worm gear.

This is the reason the free-wheeling pin was on gear-driven tube-frames.

Edit: I didn't see Old Buzzard's post until after I wrote this. ....We both said the same thing.
 

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Sounds like I am SOL, I didn't realize that this transaxle would not freewheel in gear. this is the type of clutch I am using http://www.northerntool.com/shop/tools/product_200415726_200415726 . So if I am understanding this correctly even when the tractor is stock as soon as you push the clutch in and stop the driveshaft the tractor skids to a stop ?? doesn't sound very fun to drive. this is the drive setup I am using the clutch drum is missing with the main drive chain but you get the idea, trying to increase the speed of the rear end. hard to believe that clutch wont drive that trans. any recomendations on a rear end I could use.

Pete
 

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When you push in the clutch on a stock tractor it does not "skid" to a stop. It will roll to a stop, depending on how fast you were traveling. The operator is wanting to stop in the first place or they would not have pushed the clutch in. Sorry but you picked the wrong rear end to do you project with. Find an old MTD or similar and you will probably have a lot better luck, but check it out first and make sure it will roll while in gear. Your clutch will remove it from the power source.
 

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The problem you are having is what makes the old tube frames so good at pushing/pulling heavy loads. You have gearing and breaking that is much stronger than most other GTs. Good Luck, Rick
 

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I didn't realize that this transaxle would not freewheel in gear.
It won't free-wheel in neutral, either.

Your project looks interesting! .....Care to share more pics & info ??

Nice fabrication & workmanship !

Do you need forward/reverse capability ? .....Do you need multiple gear choices?
 

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Discussion Starter · #10 ·
Mmmm i am a bit dissapointed, i started this with a bolens 750 that was to far gone to save. Figured i could build it for cheap. I will finish the build then look for a different rear end to use. I would like it to be a fully functional machine when done thats the reason i am using a gt trans so i get all the gears plus reverse. I will start a thread on this sooner or later, thanks guys
Pete
 

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If I am right an old three wheeler rear out of a Honda big red, the shaft driven kind would work. I have one laying outside right now to bad your in NY. Those rears are easy to come by and tough as nails pull extremely heavy trailers around with it and never had any issues. I may be wrong but that's my guess anyhow.
 

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It won't free-wheel in neutral, either.

Your project looks interesting! .....Care to share more pics & info ??

Nice fabrication & workmanship !

Do you need forward/reverse capability ? .....Do you need multiple gear choices?
Rock it a little most will.
 
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