![]() 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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