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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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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