Thanks again. I started reading about cavitation. One site mentioned this, concerning viscosity and cheap to expensive fluids:Depending on the control system you have, they all can go out of alignment.
As @m5040 mentioned a certain amount of whining at low oil temperatures is to be expected to happen due to higher oil viscosity, but try to minimize it by letting the oil warm up. I believe that @MossRoad starts his and lets it run for a while (15 min?) while he does some hand shoveling. If your pump is not in trouble, the whining sound is the oil cavitation as it is being pump and the cavitation is very hard on, and damaging to, surfaces.
All the best,
Peter
“Therefore, most hydraulic systems should not be started up with the oil any colder than 40°F and should not be put under load until the oil is at least 70°F.”
Wow! The article was dealing with factory-type equipment and systems but I believe some of it extends to our equipment…
