You want to be very careful about running this engine hot. It is a cast iron block with aluminum heads. When the heads get hot, they have a tendency to drop out the valve seats. I've already had to have heads redone on a couple of them. To correct one misstatement, there is only ONE coolant pump on this engine. As far as I know, the old Ford flathead V-8 was the last engine to use more than one pump - at least in automotive applications. This does sound very much like you are having a major coolant loss. Head gaskets are a possible suspect. Pinholes in hoses are another possible culprit. As always, diagnosis is your best friend. You will be far ahead in the long run to have some tests done before spending any significant money.
Also, to janicholson : the "strip test" for combustion gases in the coolant is unreliable. It gives way too many false positives, and from other sources than head gaskets. It also only "tests" a part of the entire system.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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