My guess would be the flow is dumping over a relief valve, so the pump is running at high pressure all the time. I'm not famiiar with the system without a schematic, so would not know why it's doing it, but chances are that's the problem. In order to warm the system up on some machines, we would deadhead a valve and run it over the main or a circuit relief... warms it up pretty fast. If there is a pressure port somewhare between the pump and valves somewhere, you could plumb a gauge in and see pretty quickly what it's doing. Not sure what the system main relief is, but I'd guess under 2000psi, 2500 for sure because it's an older design gear pump.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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