Using a 4 1/2" Angle-Grinder with a Thin Cut-off wheel, held at approx. a 30 Degree angle will NOT scratch the surface of the steel..! It will act like a hot Putty Knife and peel the red rust off (wear a dust-Mask and glasses). Best way to get the job done and done right..
I would not be adjusting that rod with the spring on it, if (when hooked to the tractor, the plow raises the rear wheel about 4" off the ground.. The Spring is just there to allow the spring to compress when the blow is in the ground that is all that rod on the Hitch is for. I am not sure just how much you know about a plow and plowing.... The rear wheel looks (in your picture) like it is adjusted VERY Low.. With the plow IN the ground, it should not leave a heavy mark in the furrow..just enough to act as a Rolling Land-Slide and control how deep the rear bottom of the plow can go in..the adjustment is critical, for proper plowing.. As you said, you actually could take the rear wheel off, but then, you will need to put a longer Land-Slide on, with an adjustable "Heel", to do the same thing the rear wheel is to do..
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