We dont know where you are from ? If it is a cold environment -- tell us if the hydraulic whine just started or it was always there as you remember. Typically a sound like that (open center system, gear pump) indicates that the intake feed(screen or what ever is used) is restricted. A pump cavitating will make this noise. If it is cold where you are and you stated that you figured you had water in the system -- I would say your intake was restricted with ice. If above freezing and the likelihood of ice is not possible then your intake is restricted with some thing else. Having the feed restricted will also greatly hamper getting the air out of the system after changing oil/flushing the system. That being said some hydraulic systems have many unusual sounds to them--- that is why I asked if this sound has always been there?
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