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A good shot of quality penetrant like Kroil or Schaeffer's Penetro every day you walk by it, hit the block stops as well. Jack it up until the entire tire/wheel is off the ground, tap on each eccentric head and keep spraying. Once they move a tad, work em' back and forth when you get even slight movement, spray em' again. If you get tired of messing with it on the tractor, pull the entire tire/wheel assy. and while still standing up, break each of the nuts on each flange and remove the bolts. Laid down with 2 each 4x4's equally spaced across the tires on each side, smack the center until the entire flange(s) pop loose. I do up to D15 rims with a bucket lined up in the center with a short 2x4 across the top of the bucket going back together, this allows the rim center to set on something while you reach underneath to install flange bolts and makes it a breeze to line them up. Once off, you can then work on each flange in a vise to get the eccentrics freed up. Clean them well and go back together with liberal amount of Anti-Seeze after checking the eccentric inserts as they may be thin if unit was ever run with them loose. Eccentric inserts and end wire retainers are cheap, well worth it while you have it apart as you don't want to be chasing a "clunk" that sounds like it could be coming from inside the rear end and worn thin eccentric inserts can make that clunking noise. With blocks noted as above, wheel center will be nearly half way down the rails when reassembled laying down and you should be able to slide the wheel center freely up and down on the rails with all eccentric locking pins in the fully released position and flanges tight. Take a good look around each bolt hole of the wheel for cracks plus around any weight mounting holes. I mount the tire/wheel assy. and with the tire just barely making ground contact, work the eccentric locking pins back and forth and you will see the rim self-center. Adjust your spacing, install the stop blocks where desired and lock all eccentric pins down until they hit full lock. I also run the tractor around a bit before releasing/tightening the eccentric pins again and they should not be hard with fresh Anti-Seeze, with full weight of the tractor on them. Not an overly big job, just takes some time and I do em' by myself.
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