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John Deere Tractors Discussion Forum
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Re: what determins the length of the belt for running impliments

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Leroy

01-15-2014 09:31:03
69.88.207.185



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You will not find a belt on a gas tractor that is wider than 6" as that was standard width of all the pulleys. The steamers used 8" belts. Never seen or heard of a 10" wide belt. Your pulleys will all measure 6" wide so that is a wide a belt as you can use. And that belt will transmit as much and more power than you have. Belts were made in different thickness for different power loads. For light power loads like the saw you can get by with smaller belts and a buzz saw could have been run with a 3 horse hit and miss engine. Length first consideration is how they can be setup as to location. A longer belt will give slightly more traction than a short bely but are harder to get tight. Mane reason for long belt on thresher was the steem engine used to power them and you wanted the fire for the steam and the sparks that resulted form the fire as far away from anything burnable as possible because if a spark would land in the straw everything would go up in flames and no fire departments at that time to try to put the fire out.

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Gtx1967jewison

01-15-2014 20:30:19
70.197.196.83



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 Re: what determins the length of the belt for running impliments in reply to Leroy, 01-15-2014 09:31:03  
There ain't hardly a 2cyl Jd with a pulley 6" wide except maybe an H or a M. The B is wider than that & his R is definitely wider than 10", more like 14. most belts at our show are either 8 or 10" wide.



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nlastovi

01-16-2014 07:54:25
67.208.179.138



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 Re: what determins the length of the belt for running implim in reply to Gtx1967jewison, 01-15-2014 20:30:19  
Quoting Removed, click Modern View to see

If I read the document correctly, University of Nebraska College of Agriculture measured thel R as a 9" pulley face (which I think means the width).

The 820/830 test says "Belt pulley diam. 12 7/32" face 9" rpm 1125 Belt speed 3599 fpm Belt flat Length 72' Width 7" Thickness 0.216""

http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1091&context=tractormuseumlit

in comparison, the 520 test says "Belt pulley diam 9 11/16"

face 7 1/4" rpm 1325 Belt speed 3360 fpm Belt flat

Length 72' Width 7" Thickness 0.216""

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Leroy

01-16-2014 07:32:42
69.88.207.185



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 Re: what determins the length of the belt for running impliments in reply to Gtx1967jewison, 01-15-2014 20:30:19  
Had 46 B, 49 B, 38 A, 51 A 7 50AR all only would take a 6" belt.



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