I bought a new 480 disc back in the early '70s, think it was an 18 1/2'. Came with 20"blades on 7 1/2" spacings. As others have siad the gang angle can be changed but that will affect cut more than levelness. Moving the rear gangs in or out will affect how much they throw into the middle. If you're getting a ridge in the middle it's either because of the gangs too narrow or the disc isn't level front to back. Front gangs should be set so the inner disc blades almost touch.
How does the disc run front to back? You might want someone to drive byside it while you make a pass thru the field to check. You should be able to get it to level using the crank at the front of the hitch unless your drawbar is too high or low. Also, you might want to check & see if one of the springs on the crank is broke or stretched or if any of the hitch linkage is bent or broke.
I agree that the 480s would ridge due to the fact that the wings were locked down & not allowed to float. That was my biggest complaint on my 480. Never had trouble getting it to level fron to rear. A better description as to "it will not level" would help.
Another thing that affects levelness is the ground speed you are running. To do a good job of leveling you need to run under 5mph and preferably under 4.5 mph.. Most guys don't want to go that slow
I have also owned 490s & currently own a 496. Depending what you want to do with a disc as to which one I would recomend. For leveling & finish work I go with the 490. If you're wanting to cut stalks then I would recomend the 496.
FWIW, if you think you have problems with your 480 leveling, wait till you run a 496, Has to be the worst IH disc I have ever owned in that regard. Have had 3 different IH dealers try to set it correctly & none have been able to so far. Have owned the disc since the mid '90s & absolutely hate the thing. If we used a disc very often I would trade it off but it seldom gets used anymore.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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