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Bush Hog St-32 Tiller Restore


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#1 olcowhand ONLINE  

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Posted February 21, 2013 - 08:06 PM

I actually almost got my shop cleaned up, but at about 75% straight, I started another project.  I brought in my Bush Hog ST-32 rear pto powered tiller.  She is completely apart, save a couple sheet metal parts still bolted together, and the gearbox partly disassembled.  I left the camera in the shop, so I'll upload pics later.  The camera was acting weird, so I think the pics will be blurry.  I've never seen a tiller built like this one. It has 2 sets of roller chains, one off each side of the gearbox, each driving one end of the tiller tine's shaft.  The inner halves of the chain case is welded to the main frame, and the tine shaft is one piece.  So with all the shaft bearings & lower sprockets rusted tight, to remove the shaft I cut it & the tine assembly right in the center.  Later I will re-weld the shaft and the tine tube after pressing off the sprockets & bearings, which will surely also require lots of heat.  One of the special top sprockets is shot, and being only 10 teeth in #40, it is looking like all I can find that is of size to fit to this system will be a 12 tooth.  So that will have to do, and it'll possibly never see actual use anyway, so I just want it functional.  Even with a 20% increase in speed, it would still be usable anyway.

 

I have this pic I took when I first brought it home.  You can see how it has the dual chain drive.  Ignore the Sears cultivator.

 

Bush Hog St-32.jpg


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#2 olcowhand ONLINE  

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Posted February 21, 2013 - 08:14 PM

Oh, forgot to add....the reason it stopped being used was one side tossed it's chain, wrapping around the top sprocket & breaking the main gearbox shaft.  So I will have to get some cold roll shafting & make my own shaft.   I can cut the keyways, so it won't be too difficult.....I hope!


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#3 KennyP OFFLINE  

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Posted February 21, 2013 - 08:14 PM

Boy, start a thread and leave the camera in the shop! Guess I can't say much, I usually leave it in the house and get to involved to think about a pic!

This will be fun to follow. Looks like it is a well built tiller!


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#4 olcowhand ONLINE  

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Posted February 21, 2013 - 08:16 PM

OK Ok..... I'll go get the camera!  It's raining now too!


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#5 Cat385B ONLINE  

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Posted February 21, 2013 - 08:17 PM

I have a possible source on the 10 tooth, what diameter shaft?


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#6 olcowhand ONLINE  

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Posted February 21, 2013 - 08:28 PM

Here are some pics.  There is some ice on my sidewalk, and that rain is COLD!!!!!!!!

 

PICT0041.JPG PICT0040.JPG PICT0034.JPG

 

 

You can see the shaft end on the left is crooked.  It is sheared in-two just inside the gearbox end.

 

PICT0031.JPG

 

Here is the tine shaft after I cut it in the middle in order to remove it to press off the sprockets & bearings.

 

PICT0045.JPG

 

 


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#7 sacsr OFFLINE  

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Posted February 21, 2013 - 08:35 PM

Daniel I am thinking that it went to a JB frame?

 

Have you ever looked close at the ST-32 pictures in themanual? It has 2 cranks like we see on the left hand side assist springs....but there are two in the photo on both sides.....ever seen that set up on a real D4-10??

 

Looking good can't wait to see the finished product. I know it will be good.



#8 olcowhand ONLINE  

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Posted February 21, 2013 - 08:36 PM

I have a possible source on the 10 tooth, what diameter shaft?

 

 

The problem is the shaft is 1".  This tiller has LARGE sprocket mount.  The piece the red arrow points to is actually made as one piece, with the gear made right on the end.  If I go up to 12 teeth, I think I'd have enough meat on the end to machine the end of this large piece, then weld the sprocket to that step down.  At the sprocket end, this piece goes down smaller & has a 1/2" hole, leaving enough material once machined to accept a 12 tooth sprocket.

 

sprocket.JPG


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#9 olcowhand ONLINE  

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Posted February 21, 2013 - 08:41 PM

Daniel I am thinking that it went to a JB frame?

 

Have you ever looked close at the ST-32 pictures in themanual? It has 2 cranks like we see on the left hand side assist springs....but there are two in the photo on both sides.....ever seen that set up on a real D4-10??

 

Looking good can't wait to see the finished product. I know it will be good.

 

 

Yes, this has the 3pt bracket to use with the JBI.  I bought it with the JBI still in original condition, except old & rusty! LOL  The same package included the S4242 3pt bush hog.   That will end up restored also, but I have restored it to working order already.

  I may build a bracket going by pics so I can fit this to my restored D4-10.   I guess the dual cranks were just to give more assist for the heavy tiller.  Never seen a D4-10 with the dual assists in person though.


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#10 IamSherwood OFFLINE  

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Posted February 21, 2013 - 09:11 PM

Looks like a major rebuild. But you'll pull it off..

That sure is a unique design. Is there any way to adjust it so both chains

are under same load/tension?

 

Any reduction in that gearbox? :smilewink:


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#11 KennyP OFFLINE  

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Posted February 21, 2013 - 09:12 PM

Thanks for braving the cold rain for the camera! Sounds like a bit of work is involved here!


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#12 olcowhand ONLINE  

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Posted February 21, 2013 - 09:15 PM

Thanks for braving the cold rain for the camera! Sounds like a bit of work is involved here!

 

Yes, a lot of work, but it's the only one like it I've ever laid eyes on, so worth the effort.  It'll sure look good on the back of a restored Hog!


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#13 olcowhand ONLINE  

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Posted February 21, 2013 - 09:17 PM

Looks like a major rebuild. But you'll pull it off..

That sure is a unique design. Is there any way to adjust it so both chains

are under same load/tension?

 

Any reduction in that gearbox? :smilewink:

 

There is a tension roller to take up chain slack, so both sides should work together fairly well.  I can't remember for sure, but I believe it is 1:1.


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#14 IamSherwood OFFLINE  

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Posted February 21, 2013 - 09:31 PM

  I can't remember for sure, but I believe it is 1:1.

 

 

Nope, it's 20:1 we need, right? :smilewink:


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#15 Cat385B ONLINE  

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Posted February 21, 2013 - 09:38 PM

When ya get it tore apart further, post up a pic of the sprocket.






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