![]() ![]() A fluid that is too high in viscosity, on the other hand, will cause poor mechanical efficiency, startup issues and wear due to cavitation. In addition, low viscosity fluids can lead to increased friction and pump wear. This is because a hydraulic fluid that is too low in viscosity will reduce the volumetric efficiency of pumps and cause fluid overheating. There is a common misconception that reducing hydraulic fluid viscosity will decrease operating temperatures, when in fact higher viscosities may lead to a reduction in operating temperatures in hydraulic applications. One of the most important criteria in the selection of a hydraulic fluid is viscosity. ![]() Other factors such as machine builder specifications, additive requirements and compatibility must also be considered. The guidelines shown in Figure 2 are designed to assist in this analysis. Consolidating hydraulic fluids can enhance system performance and reduce costs however it requires a careful analysis. An abridged version of ISO viscosity grades is listed in Table 1.Īccommodating a variety of equipment builder preferences can lead to an abundance of fluids and high inventory costs. They may also identify qualified lubricants by brand name or the ISO viscosity grade. Machine builders recommend hydraulic fluids for their equipment by specifying characteristics such as viscosity, antiwear performance and oxidation stability. ![]()
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