Thanks Matt. I figured you'd take my bait...thanks a TON for the info and for the "watch-outs".
I've noticed that harmonic at about 1/3 throttle. Seems to be a pretty common thing on a 3-cylinder Kubota. My Kubota zero turn (28-hp, 3-cyl) and dad's Kubota SCUT (22-hp, 3-cyl) both do the same thing as the Kub-Cadet at about the same empirical throttle position. And they all shake a bit more at low idle than I would expect.
I bought my 1512 mostly on a whim because the price was so good. But it really has won me over as a great tractor. But I was amazed that the driveshaft, something that CC hung their hat so proudly on, could be a source of expense trouble with these things. It just seems counter intuitive.
This 1512 runs amazingly smoothly at all RPM's except idle and at about 1/3 throttle. I have no baseline to compare with, but I think everything is in good condition but I'll have to give a closer look to the rag couplings and the junction at the pump to make sure it isn't getting loose.
Thanks again,
Steve
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