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Gravely 2 stage snow blower


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#1 Rick444 OFFLINE  

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Posted January 29, 2016 - 12:43 PM

I have a 1978 Case 444 Hy-Drive tractor that I re-powered with a 23hp Briggs with an electric clutch. I would like to run a 2 stage snow blower with it but Case didn't make one. I want to adapt a 48" Gravely 2 stage snow blower to run with it. I'll need to change the direction of rotation of the Briggs to spin the right direction for the Gravely blower. My main question is, what speed is the Gravely blower designed to spin at?


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#2 chieffan ONLINE  

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Posted January 29, 2016 - 02:51 PM

I don't think you will be able to change the direction of rotation for the Briggs.  Can you turn it around and drive it from the other end of the crank, or will this be wrong for the tractor drive?


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#3 Rick444 OFFLINE  

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Posted January 29, 2016 - 03:40 PM

I can run a v-belt from the engine clutch pulley to a jack shaft that rotates the same direction as the engine. Then run a timing belt with teeth on both sides from a timing pulley on the jack shaft, around a timing pulley on the shaft that will drive the blower using the back side of the belt, and then around a couple of idler timing pulleys to create the loop for the belt. By using the back side of the belt to drive the shaft that will drive the blower, it will rotate the opposite direction from the engine. I just need to figure out how to fit all that in the space that I have under the front of the tractor. So, assuming that I can fit everything in that space to change the direction of rotation, do you know what speed the blower of the Gravely snow blower attachment was designed to spin at?

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#4 boyscout862 ONLINE  

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Posted January 29, 2016 - 04:25 PM

Welcome to GTT. Your tractor is twice as good as mine because it is a 222. Could you run the 2 stage off of a hyrdraulic motor? The 444s that I've seen could run a hydraulic tiller. Maybe that will be an easier way to do it. Let us know how you make out. Check out our Manuals Section too. Good Luck, Rick

 

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Edited by boyscout862, January 29, 2016 - 04:37 PM.

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#5 Diesel1050 ONLINE  

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Posted January 29, 2016 - 04:58 PM

Why not just flip the belt 180°??
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#6 Rick444 OFFLINE  

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Posted January 29, 2016 - 06:47 PM

Ya, that's a possibility. I hadn't really thought of that because the pulleys will be pretty close together. There may not be enough distance for the belt to make the 180° twist in that short of a distance, but it certainly is worth thinking about. Thanks for the suggestion. I still don't know how fast the Gravely blower is designed to spin, do you know?

 

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#7 Cat385B ONLINE  

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Posted January 29, 2016 - 07:29 PM

Gravely attachments are designed to have an input speed of roughly 1,000 rpm.
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