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Allis Chalmers Rototiller Adjusting Rod


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#1 New.Canadian.DB.Owner ONLINE  

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Posted September 28, 2012 - 06:39 PM

I installed the rototiller onto my HB112 today. Everything went fine until I went to tighten the drive belt. My adjusting rod doesn't seem to adjust anything. I would have expected a hole and pin in the rod to keep one end fixed. I also think my spring is toast.

Anyone know if there should be a hole & where it goes.

Anyone know how a part number & source for the spring?

Attached Thumbnails

  • Adjusting rod 1a.jpg
  • adjusting rod 2.jpg
  • adjusting rod 3.jpg


#2 MH81 ONLINE  

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Posted September 28, 2012 - 07:03 PM

Mine's a little different, but It almost looks like that handle is more of a "Limit" than a fixed adjustment.
And yes, your spring is sprung... :)
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#3 New.Canadian.DB.Owner ONLINE  

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Posted September 28, 2012 - 08:22 PM

that handle is more of a "Limit" than a fixed adjustment. :)


Sorry to sound like a duffus, but how do you set the limit and, well, what does it limit?

#4 MH81 ONLINE  

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Posted September 28, 2012 - 09:10 PM

On mine, there is a rod with a spring and an adjustment setscrew piece. It stops the handle from going to far when you take it out of gear and the spring keeps the tension constant on the belt when in gear.

Do you have a model number for the tiller? Someone might be able to find a manual or at least an exploded view which would help you some here.
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#5 Cat385B ONLINE  

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Posted September 28, 2012 - 09:40 PM

Here ya go: http://www.simpletra...ary_tillers.htm
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#6 MH81 ONLINE  

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Posted September 29, 2012 - 05:31 AM

Good find CAT, I looked thru them & this pic looks closest to me.
Posted Image
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#7 achomesteader OFFLINE  

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Posted September 29, 2012 - 06:15 AM

If your adjusting rod doesn't seem to adjust anything, it might be that the pivot is frozen with rust where the lift bar assembly (part "Z" in parts list) is attached to the belt tension lever assembly (parts "AB" and "AD").

There is no hole in the adjusting rod for a pin, as it is not needed. If all pivot points work freely, the weight of the tiller combined with the pull of the drive belt keeps pressure against the compression spring. Turning the adjusting handle in a clockwise direction increases the pressure against the spring and pivots the tiller to tighten the belt.

The spring (part "AL" in parts list) is Simplicity part #8191047 and has been superseded to new part #1729278. It should be available from your Simplicity dealer or online.

Below are links to operator's manuals with parts lists of Simplicity tillers equivalent to your A-C tiller.

http://bsintek.basco...rE3Cvh5kbp796Dq

http://bsintek.basco...rE3Cvh5kbp796Dq
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#8 New.Canadian.DB.Owner ONLINE  

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Posted September 29, 2012 - 08:30 AM

I don't know the model number but I will check later today, if I get a chance. The diagram MH 81 provided does look like the tiller I have. It does pivot freely as achomesteader described, but even at full in, the belt is loose. Makes me think the belt is too long or the spring is to short now ;-). I'll check belt length next and look for a spring.

I wish I'd seen the manuals earlier. I spent a day trying to figure out where everything went & what size pulley I needed at the bevel gear box. Many

#9 KennyP ONLINE  

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Posted September 29, 2012 - 09:34 AM

That's what I like about the folks here! They will help you find a solution, may take a bit and a few questions, but the answer will come.

#10 New.Canadian.DB.Owner ONLINE  

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Posted October 19, 2012 - 07:27 AM

I finally got enough time to look at this again. I still don't have a model #. There doesn't seem to be one on it. That said, it was seized just like achomesteader said it would be.

... the pivot is frozen with rust where the lift bar assembly (part "Z" in parts list) is attached to the belt tension lever assembly (parts "AB" and "AD").


Many thanks for the assistance!

#11 skunkhome OFFLINE  

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Posted October 24, 2012 - 08:46 AM

Any development on the tiller? There have been several referenced to this part as an adjuster. I would say that it more correctly a belt tensioner. As Greg stated, It's purpose is to pull the drive belt tight and the spring is to provide shock relief. The screw must be tightened after installing the tiller and loosened to remove.

Edited by skunkhome, October 24, 2012 - 08:50 AM.

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#12 New.Canadian.DB.Owner ONLINE  

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Posted October 26, 2012 - 08:33 AM

I haven't used it since my earlier post, but yes, you are correct. It does control belt tension for the tiller drive belt & I did need to loosen or remove it to get the belt on. The spring is short & doesn't provide a great deal of shock absorber action, but it does provide some.




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