I recently bought another copy of that same manual on eBay while I was looking at an IH 3414 industrial tractor with a 3120 backhoe for sale locally. It also had excessive motion in the vertical swing shaft as well as the sort of leakage you're referring to, and I wanted to get an idea of what I might be dealing with. The manual has an excellent section on rebuilding the swing unit, with instructions and photos. Well worth it.
In the end I passed on the backhoe because all the bushings and pins were too far gone. But I'm keeping my manual because I hope to find another IH backhoe for sale one of these days with the same swing mechanism.
Do a search on this site under IH 3414, or 3120, and you will find a couple other guys rebuilding these units.
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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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