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Tiller RPM


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#1 hfm0323 OFFLINE  

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Posted November 06, 2010 - 02:36 PM

I have a bolens 33" tiller, considering looking for a right angle gear drive to push it. Anyone have a clue what RPM these shaft driven tillers are designed to run at?

#2 olcowhand OFFLINE  

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Posted November 06, 2010 - 02:59 PM

Tillers generally run anywhere from 200 to 300 rpm at full engine rpm, depending on make. Maybe a Bolens guy can dial it in for your tiller speed.
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#3 hydriv OFFLINE  

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Posted November 06, 2010 - 03:39 PM

If it was my tiller, I would prop it in the air, get one tine to sit vertical. Use a marking pen to draw a line on the underside of the tiller hood and then put a line on the tine so that it matches up with the other line. Then I'd put a line on the pulley that matches up with a line on the hood or frame of the tiller. Rotate the pulley and keep track of how many full revolutions it takes to make the marked tine make one full revolution.

Once you know that, you have the gear ratio of the tiller's reduction. Engines are governed to run at 3600 rpm at full throttle. The issue here for you is "How fast did the Bolen's PTO spin when the engine was running wide open?" The second question is "What was the diameter of the PTO pulley driving the tiller?"

Let's play make believe.

Engine at 3600 RPM driving the PTO shaft with a 2 to 1 reduction. PTO shaft is now spinning at 1800 RPM. PTO pulley is half the diameter of the tiller pulley for another 2 to 1 reduction. Tiller pulley now running at 900 RPM. It takes 5 full rotations of the tiller pulley to make the tine shaft rotate once. That's a 5 to 1 reduction 900 RPM divided by 5 equals a tine speed of 180 RPM. That's right around the speed that Case hydraulic tillers spin at.

If the tiller has a model number, then the Bolens boys can tell you what models it fits. Once you know the tractor model number, then a parts manual should yield some information about how the PTO was made and may even tell you the pulley sizes.

The rest is just math.
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#4 Bolens 1000 ONLINE  

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Posted November 06, 2010 - 05:31 PM

Bolens made a few different models of tillers. What model to do have? is this for a largeframe or tube Frame Bolens ?
On a Tubeframe, my Book says the PTO speed was 3600 RPM at full throttle
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#5 hfm0323 OFFLINE  

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Posted November 06, 2010 - 06:16 PM

It's made for a medium frame XL series, much more info. and interest out there on the large and tube frames. Tiller Model #18315, I've spoken with owners selling different models of these tractors and to date none were confident their machine had all the equipment needed for a direct bolt up. Most everything I've found is at least six hours away from me, not a trip you'd take without some assurance you'll find what you're looking for on the other end. The driveshaft has two universal joints with the pto end a 15 spline female.

While I'm looking for a tractor, I felt someone might have some insight toward a desired tine speed. With that, I can engineer back to an engine as hydriv suggested. I'm comfortable with the suggetions thus far in the 180-200 range. I'll do the math an see if an alternate drive system presents itself before I find a tractor.

Thanks for your suggestions

#6 Bolens 1000 ONLINE  

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Posted November 06, 2010 - 06:48 PM

Here's the parts list if that will help... http://sonnys_bolens...18315-02-05.pdf

Unfortunately I dont have many documents or manuals for these series Bolens :(

#7 olcowhand OFFLINE  

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Posted November 06, 2010 - 07:43 PM

My buddy has a Case 446, nd his tiller turns about the slowest of any tiller I've ever used. I would not want a tiller running any slower, but it does do a good job. My Massey 1650 tills at least 50% faster I would say, but I'd have to do the math to know for sure. My faster running tiller sure does quicker work than my friend's Case does. Just as much a case of preference really.

Edited by olcowhand, November 06, 2010 - 07:49 PM.


#8 DH1 OFFLINE  

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Posted November 06, 2010 - 07:47 PM

I have an operators manual for a MF650 tiller that fits the Massey MF10s,12s in there it says 135 RPM Tine speed.

#9 olcowhand OFFLINE  

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Posted November 06, 2010 - 07:50 PM

I have an operators manual for a MF650 tiller that fits the Massey MF10s,12s in there it says 135 RPM Tine speed.


That's slower than I would have thought! I could be wrong about my MF4250's speed, but it sure is booking compared to many. I usually drop my engine rpm so there isn't as much shock if I hang a rock.

#10 DH1 OFFLINE  

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Posted November 06, 2010 - 07:53 PM

I forgot to mention that it says in the manual run engine at 3/4 speed, so what the tine rpm is for engine rpm???

#11 olcowhand OFFLINE  

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Posted November 06, 2010 - 07:56 PM

I forgot to mention that it says in the manual run engine at 3/4 speed, so what the tine rpm is for engine rpm???


That would be about 2700rpm.

#12 DH1 OFFLINE  

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Posted November 06, 2010 - 07:59 PM

That would be about 2700rpm.



One tool I want to get is a laser tach. I think it would come in handy for stuff like this, waiting to find one an sale somewhere.

#13 hfm0323 OFFLINE  

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Posted November 07, 2010 - 11:55 AM

I'm slowly learning how to use search this site, I see a couple of these tractors registered under name tinkerer. He could probably help me understand what specific features I am looking for in a tractor. Do we have a means of contacting other members?

#14 Bolens 1000 ONLINE  

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Posted November 07, 2010 - 12:32 PM

Yeah you can send a private message to other members.
Click on their user name then click to go to their profile page. Once you are on their page look to the left and select "send private message"pm.jpg
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#15 hfm0323 OFFLINE  

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Posted November 07, 2010 - 01:13 PM

Thanks for your pateince with a slow learner.




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