I had the same problem with my Ford 600 a few years ago. I decided it must by the coil, so I bought a replacement. When I went to install the new coil, the power wire to the coil broke as I was trying to loosen the terminal. It turned out that the braided wire had corroded or frayed inside the insulation. Enough contact was left to start and run the tractor when the wire was cold, but I suspect that the there was enough resistance at the frayed/corroded point to break the contact when the wire heated up.
A new piece of wire solved the problem. An ignition switch (or wire into or out of the switch) could cause the same problem. You might try running a jumper wire from the battery to your coil.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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