I do the same thing before I plant all my tree rows. I was told you want to subsoil in the fall, in the spring you will slice the hardpan, but not break it up.
In the fall you can watch the ground "errupt" as it shatters the hardpan. The the water gets down and freezes through the winter breaking it up even more.
Now I am just a rookie, someone else could explain it better I am sure.
Now for HP. I run my 3930 4wd with one shank at 20 inches and it is crying the whole way. I bought a 9 shank, left 3 on and pull it with AC7000 (105HP) does much better.
I think your 1640 might be huffing just a bit like my 3930 does. I leave my loader on, rear tires are loaded, no traction problems. When that tooth really bites it will stop the tractor like I just threw an anchor out.
Hopefully ripper is spring loaded or shear pinned. I have hooked 2 rocks that I am amazed didn't bust something on the tractor or the ripper.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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