Posted by Jon Hagen on January 04, 2009 at 15:15:50 from (12.175.230.38):
In Reply to: Types of Hyd oil posted by Amo in Nebraska on January 04, 2009 at 13:19:04:
Many engine and hydraulic oils have a water dispersant additive which will absorb the water and circulate it with the oil. This is working on the theory that if the oil gets hot enough in operation, it will "boil off" the water. This also keeps water from pooling at the bottom of the tank/pan and freezing up intake screens or pumps. Once there is so much water in the system so the water dispersant is totally saturated with water, then you again will get water pooling in the bottom.
Two different ways of thinking, do you circulate water in the fluid and hope it boils off before getting in places where it can cause corrosion, or do you try to keep it pooled in the bottom of the sump and hope it never gets deep enough to clog/freeze anything. Either way, that is why oil changes are recommended on months in place as much as hours of running time.
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