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Tractor Talk Discussion Forum

With all the tillage questions...

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JoeBob/IN

04-12-2007 09:23:42




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With all the talk about what horse power, how deep, what soil, what type of tillage, etc I thought I would throw in my 7 cents (inflation!). I had always been told that if you can't pull any piece of tillage equipment right at 5 mph or more than you need a bigger horse. Even in my 2390's operator's manual it says you need to pull at 5 mph or above. I was told the reason has to do with the excessive amount of torque and strain put on specific parts at the lower speeds where the engine won't lug down and the tires won't give. Obviously you could max out a tractor at 3 mph and do so for years without damage since I know many have done so, so don't shoot the messenger. And with 150 horse tractors selling for same of less that 100 horse why not just get one made for the job. Not pointing at anyone in particular either.

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James22

04-12-2007 12:07:40




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 Re: With all the tillage questions... in reply to JoeBob/IN, 04-12-2007 09:23:42  
Draft or pull increases exponetially with ground speed, or more particularly, as a function of the speed squared. Consequently small increases in ground speed can result in a significantly higher draft load. The old standard was to use 3.5 mph or above. However caution must be used when adding weight thereby attempting to eliminate wheel slip at these lower speeds; ie, if you "tie" the tractor to the ground, driveline forces can get very high. However some jobs such as field cultivation, need to be done at higher speeds to enhance chemical incorporation or to render a better seed bed. Sometimes running a high horsepower tractor at lower horsepower jobs is not very fuel efficient; eg, pulling a smaller implement at high speeds to use the larger tractor's full horsepower increases the draft so much that you will use more fuel than if you used a smaller tractor at a more moderate speeds. On high draft operations such as moldboard plowing or inline ripping, I size implements so that they can be pulled between 4-5 mph.

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