I also have a IHC 784, not a bad tractor. I second what the other guy said about keeping a decent amount of fuel in it. Although the tank is not empty if it gets below about 1/4 tank is starts to run funny. I think this is because on level ground the fuel inlet for the fuel filter is higher than the bottom of the fuel tank and there is no pump between the tank and filter. One gripe I have about the 784, and I assume 684 or 584, is the front end power stearing set-up. Whoever designed that should be shot. But, the newer model versions of the Case/IH tractor had the same set-up, very poor design if you ask me. Another gripe is the shifter on the transmission but I understand that they changed the design in later years. Not a bad tractor, all depends on what you have to pay for it. Mine has only single hyd outlet, would much prefer a double. You can add a spool of course, but that is an added cost.