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I have a John Deere 4020 Diesel with a syncro-range transmission. With engine idling, when you push in the clutch, the power steering cuts out and you lose the power brakes. Also, I don't know if it's related, but the 3-point will settle quickly with the engine off, and is initially slow to raise.
Is the problem possibly the transmission pump or the check valve near the pump, or the cooler bypass valve, or could it be another check or relief valve elsewhere in the system?