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How would you determine what size tractor is needed to pull a 10' to 12' disk in sandy loam soil for fire lanes and disturbing the soil for quail habitat improvement. I need a FEL that will lift at least 2,000 lbs. Also intend on no-tilling 100 acres of milo.

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I would think that you would need something in the 100 to 115hp range. Are you talking about a hydraulic disk or 3ph.
 
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Maybe a bit less

If you aren't running the disk too deep or disking that sandy loam after turn plowing you could get by with probably 70 hp in a 4wd tractor. We could pull a 10' with a 65 hp 2 wd tractor but at times that was pushing it if we had a harrow behind the disk. A few more hp would give some leeway. If you are talking about an offset disk which cuts deeper, I would go up on the hp another 5-10.

HP needed for no tilling depends on the width and number of coulters/rows but you can match that to the tractor. Anything in that HP range should have a 2,000 lb lift capacity.

Treefarmer
 

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I pull a 13' disk behind a 3020 which is about 70 hp. Never in andy soil which I think would be easier. However it weighs right at 8000 pounds with calcium filled rears. It never has an issue pulling it. I think weight has a lot to do with it as much as horsepower.
 

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Min 70HP and R1 tires. Do not even think about R4 tires. I have to use 4WD on my 4066R with R4 tires to pull an 8ft 3pt tandem disk. Not enough traction in 2WD. I leave the loader/bucket on purposely for extra weight/traction and that puts me at around 6000# plus the disk. At 70HP, I think you will need 4WD, although the older tractors at that HP were much heavier than the tractors of today at 70HP, so an old tractor might be OK at that level. For today's tractors, probably closer to 100HP would be more what you would need. You can always gear down to make up for lack of HP, but you cannot make up for lack of weight/traction.

Dave
 

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I have a 4010 (80 hp) that I do most of my field work with. I wouldn’t go with any less than 70 hoarse for what you want to do. I’m looking at going to a 5085 eventually.
 
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I would say with a MFWD tractor at least 60 hp, if you are talking rear wheel only I would say a minimum of 80-85. But I believe you will find MFWD much better for traction depending on the conditions of the ground at the time of discing.
 

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Just curious, for fire lanes would u want a offset? A tandem disk won't pull as hard..correct? A tandem disk wouldn't chew up the ground enough to stop a fire, or slow it down would it? Again just asking for knowledge. We are buying a offset and they pull much harder than a tandem in size comparison.
 

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Just curious, for fire lanes would u want a offset? A tandem disk won't pull as hard..correct? A tandem disk wouldn't chew up the ground enough to stop a fire, or slow it down would it? Again just asking for knowledge. We are buying a offset and they pull much harder than a tandem in size comparison.
A set of finish discs definitely don't pull as hard, but they also don't turn the dirt as good. The drawback to offset discs is they require HP and quite often MFWD. Our White 2-85 can pull them our 12' offset discs but will often loose traction before running out of power. We pull them with the 2555, which is less HP but is MFWD, that will run circles around the 2-85 but it does make it grunt.
 
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