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In Reply to: 4020 hydraulic problem posted by Mike on Sunday, February 08, 2004:
I have the exact same problem. The high pressure pump acts like it is starving for oil from the rear charge pump. The system is dumping oil to the resevoir somewhere. (Evens has a minor whistling noise telling me its blowing by somewhere)I will look at the priority valve as suggested but if it is starving the high pressure pump, it has to be dumping oil at the distribution valve? This is a very common problem, someone had to go thru this exercise many times before. Look forward to your suggestions. Thanks