In absense of test data, a comparable Kubota model would be the M6800 with it's 202 cu in engine and 62 PTO HP. The M7040 has been improved, no doubt, however if you compare the specs, side by side, they are very similar tractors. I have a Brillion 3 point double frame 3 shank subsoiler as shown on their webpages. Three point helps a lot. Harry Ferguson was right. I was not able to go any deeper than 10 to 12 inches on my first attempt on fields that were severly compacted. Our soils here are the result of glacial action and are not uniform. We have red clay knolls that defy description in toughness and yet grow good crops. Also clay loam, sandy loam and heavy black bottom land. All in the same field. I had doubts about even being able to pull three shanks when I bought the subsoiler. Now, after six years, I can go down 17 to 18 inces anywhere. I carry a yard stick and check depth and also visually check depth of shanks. I do this in the fall. My M6800 has MFWD and it needs it to do this. The only added weight is the loader and whatever it has in it in the form of picked up field stones along the way and the mechanical advantage of a mounted implement with draft control. The HP required cannot be reverse computed from the test data because they only did the test at a much higher RPM than I use. I've never had my M6800 as high as 2700 RPM. Note that 540 PTO comes in at 2295 eng RPM. They did not record a test at a lower RPM as, for example, done in the test of the John Deere 6403. In that test you'll see where shifting to a higher gear and reducing RPM resulted in the same HP, same ground speed, same wheel slip and less fuel usage (4.432 gph vs 3.99 gph). There was much less difference in their RPMs (2175 vs 1746) than in my case (2707 vs 1900). Yes, I know I'm using more than 27.5 HP so the better fuel efficiency is coming from operating the engine at 1900 RPM. Right in front of the torque bulge. As far as the recommended 125 lbs per HP, that is a recommended figure from a dandy little pamphlet available at your friendly John Deere dealer entitled, "Optimizing Tractor Performance".
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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