![]() These problems can be avoided if the water content is maintained below 0.1 percent. The water is kept in suspension, which can cause a reduction in both lubricity and filterability, leading to the potential for corrosion and cavitation. However, these detergents and dispersants can cause the fluid to emulsify any water that is present, rather than shedding water as you would want in a standard hydraulic system. The use of these fluids is approved by many manufacturers and can offer several advantages in mobile equipment such as preventing varnish and sludge. ![]() There is a class of hydraulic fluids (DIN 51524) that contains dispersive and detersive additives much like engine oils. This is dependent on the equipment and manufacturer. Is it a problem to use these? What integrity or lack of it does it give to the machine and to the people working around the site?" "It is a common practice in the construction and mining industries to use engine oil SAE 10, SAE 20 or SAE 30 with the lowest API rating as a substitute for hydraulic oil ISO 32, ISO 46 or ISO 68, respectively for hydraulic systems of heavy equipment.
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