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Decrease In Drive Pulley Size


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#1 frenchy OFFLINE  

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Posted December 21, 2012 - 03:07 PM

I bought a PTO that has a 4" drive and the old one was 6". Will my tiller be ok with the 4" one of will it run too slow?

#2 Ryan313 OFFLINE  

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Posted December 21, 2012 - 03:10 PM

I can't answer your question, but what tractor and tiller you are using might be able to help out the members who can tell you.

#3 Guest_rat88_*

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Posted December 21, 2012 - 03:22 PM

Drive pulley, as opposed to a driven pulley?

if you go from a 6" drive pulley to a 4" pulley, you will loose 33% speed. I am not sure how it will effect tilling efficiency, but it will feel like you have more horsepower.

I have never gotten that far into tillers, but assuming it has a 100:1 gear ratio, the tine speed would drop from 36 rpm to about 24.

Edited by rat88, December 21, 2012 - 03:30 PM.


#4 shorty OFFLINE  

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Posted December 21, 2012 - 05:05 PM

Would you be able to change your other pulley to offset the change? That much of a drop in tine speed would make a big difference in how fine it could till. Just a thought.

#5 Guest_rat88_*

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Posted December 21, 2012 - 05:32 PM

Would you be able to change your other pulley to offset the change? That much of a drop in tine speed would make a big difference in how fine it could till. Just a thought.


I think you could get the same result, slower travel may not be an option, so you may have to make an extra pass or 2.
I guess it comes down to: how fast you want to get it done/ how much seat time you want to get

#6 JDBrian ONLINE  

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Posted December 21, 2012 - 08:09 PM

That would cut the tiller speed down to 2/3 of what it was - say to 160 from 240 rpms. A smaller pulley would not be able to transmit as much power as the larger one but that may not be an issue.

#7 frenchy OFFLINE  

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Posted December 27, 2012 - 05:30 PM

Thanks for all the replies. It's my MF14, but I just bought a Kohler Command 18hp v-twin that i'll be fitting on the chassis soon. The PTO that I got is a 4" pulley and that goes to the tiller which has probably close to a 12"-15" pulley. I think it'll be ok, but just want to be sure. As far as I can tell, the pulley on the PTO isn't interchangeable.






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