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Tensioner block for a med. frm snowblower


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#1 Doug E. ONLINE  

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Posted December 17, 2016 - 03:04 PM

Gents,

 

My snowblower for my medium frame tractor (model 18311) has a tensioning block to take up slack on the snowblower chain.  In the parts diagrams, it is part number 1726829.  The one in the snowblower is worn and I have no more adjustment to take up slack.  The block I took out is a plastic disk, 2" in dia and 1.1" thick with a 3/8 hole in it, and appears to be nylon.  Is this really what is supposed to be in there? 

 

The block has a steel spacer on each side, with a bolt running through all three, and a nut with a lockwasher on the end of the bolt.  When you tighten the lockwasher down, it squeezes the spacers against the block.  The parts break down seems to agree with this, but I would have thought that the block being round, would be better rotating. 

 

I looked at my large frame and tube frame snowblowers, but neither have the tensioning block in the design.

 

Can anyone confirm that this is the correct set up?

 

Thanks,

 

Doug


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#2 ol' stonebreaker OFFLINE  

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Posted December 17, 2016 - 03:08 PM

  If I have it pictured correctly in my mind, can't the block be rotated to an unworn portion of it?

                                           Mike


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#3 ClassicBolens OFFLINE  

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Posted December 17, 2016 - 03:41 PM

Yes, it is just a nylon roller and is correct for the 18311 blower.
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#4 Bolens 1000 ONLINE  

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Posted December 17, 2016 - 03:46 PM

:ditto: thats the correct setup for this blower.

 

I had a run of reproduction tensioners made last winter for these



#5 Doug E. ONLINE  

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Posted December 17, 2016 - 03:46 PM

Yes, it is just a nylon roller and is correct for the 18311 blower.

Thanks,

 

Is it supposed to be stationary, or rotating?

 

D.



#6 blackjackjakexxix OFFLINE  

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Posted December 17, 2016 - 03:48 PM

I show I have 1 factory Bolens one left in stock if your interested,pm me for a price,Thanks,Rick

#7 Jazz OFFLINE  

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Posted December 17, 2016 - 04:04 PM

i know on my sears unit its stationary and the hole is off set for adjusting tension on chain.  I repaired the wear grooves on mine with JB weld,,not sure how long that will last....



#8 Bolens 1000 ONLINE  

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Posted December 17, 2016 - 04:37 PM

Thanks,

 

Is it supposed to be stationary, or rotating?

 

D.

 

I believe it was desgined to rotate a bit as it was put between two spacers



#9 Bill 76 OFFLINE  

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Posted December 17, 2016 - 04:58 PM

I turned one out of a piece of Delrin , it's made for heavy load mechanical applications. I also turned a brass sleeve to fit inside the roller about .030 longer then the roller width so I can crank the bolt down tight and the roller turns the way it should have been made.


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#10 ClassicBolens OFFLINE  

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Posted December 17, 2016 - 05:14 PM

It should turn fairly freely on the bolt.
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#11 Doug E. ONLINE  

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Posted December 18, 2016 - 12:28 AM

Thanks guys,

 

If I leave the block loose enough to turn, I can't tighten up the bolt enough to keep tension on the chain.   I was thinking along the same lines as Bill mentioned about adding a sleeve for the block to turn on, but still being able to tighten the location down for chain tension. 

 

I have a piece of nylon at work, and think I will turn a larger dia block out of it, to give me more adjustment leeway.  I tried UHMW, but it is too soft, and the chain ate it up quickly.  I'm sure it would have lasted better spinning rather than stationary.  I thought of Delrin, but don't seem to have any left that is large enough.

 

Thanks again!

 

Doug


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#12 Jazz OFFLINE  

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Posted December 18, 2016 - 09:08 AM

Obviously I better take a closer look at mine as mine was not rotating. 



#13 Doug E. ONLINE  

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Posted December 20, 2016 - 09:39 AM

Gents,

 

Here is what I have done. 

 

I turned a new tensioner block out of what I think is Delrin.  I drilled a piece of 5/8 ground shafting for the bolt, and counter bored the sides of the tensioner block for a washer to keep the block centered on the shafting.  I will use the factory spacers against the washers.  The drilled shafting is longer than the distance between the counter bores, so that the block will rotate.  I made the block 2.6" in dia. rather than the original 2" to give me more adjustment.  I will put this on the snowblower today to finish up my snow removal. 

 

I have attached a pic of the new parts with the old one.

 

Regards,

 

D.

 

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#14 ClassicBolens OFFLINE  

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Posted December 20, 2016 - 11:35 AM

Looks like that should work very well, if not better than the original.

#15 blackjackjakexxix OFFLINE  

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Posted December 20, 2016 - 11:49 AM

Very nice,keep us posted to how it works out




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