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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