Disc size guess?

[DDT]

Have Kubota M6040 4x4 with loader. Have sandy soil, I think it would pull a 10 or 12' wheeled disc. Hard to find 10' in my area. Im referring to a finishing tandem disc. Off set pulls harder. Any experiences or thoughts?

 

[ovrszd]

Yeah, your tractor will easily pull a 12' finish disc. I have one. I pull it with my M9540 in 2wd at half throttle. Actually in the conditions you mentioned you could pull a 14'.

My disc gangs can be adjusted for more severe cut or straightened to do finish work. On all discs you can set a stopper on the cylinder so the wheels carry part of the load. With these types of adjustments in mind, your tractor will pull a much larger disc than you might think.

 

[Poopdeck Pappy]

These are the stoppers Richard is talking about. We used to call them donuts. You put as many of them as necessary on the cylinder shaft to limit how much the cylinder will close, so the disc harrow won't go too deep.

SpeeCo Stroke Control, 1-1/8 in. to 1-1/2 in. - Tractor Supply Co.

 

[DDT]

Yes I have a set and use them when needed. In my area we call them cylinder stops. Thanks for the 12 ft vote. I want to buy the correct size first time.

 

[motownbrowne]

Yes I have a set and use them when needed. In my area we call them cylinder stops. Thanks for the 12 ft vote. I want to buy the correct size first time.

Worse comes to worse, you can always make a disc smaller. It might be a little harder to make it bigger, though.

 

[smstonypoint]

William Edwards at Iowa State has a fact sheet that shows you how to calculate the required HP for various implements. It's a pdf file and I can't get a direct link to work. Google matching tractor power and implement size and the file will show up. There are also spreadsheets that you can download that will perform the calculations.

Steve

 

[ovrszd]

I'm with Motown, go big. Look for a 14', settle for a 12', forget a 10'.

 

[Poopdeck Pappy]

I'm with Motown, go big. Look for a 14', settle for a 12', forget a 10'.

You may be right, but I'd go with a 10' if I had the choice and that size tractor. I'd rather be able to set the disc to the most aggressive angle and bury it up to the axles, even though it would take longer to complete the job with a 10' vs. a 12' or 14'.

 

[smstonypoint]

I used the formula in the fact sheet I referenced, and came up with 53 HP for a 10ft disk weighing 2000 lbs traveling at 5.5 mph in sandy soil.

Steve

 

[motownbrowne]

I used the formula in the fact sheet I referenced, and came up with 53 HP for a 10ft disk weighing 2000 lbs traveling at 5.5 mph in sandy soil.

Steve

So is that PTO HP, or drawbar HP? Unfortunately they don't publish drawbar HP much these days, at least in the size we're talking about.