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 - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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