Hydraulic systems encounter power loss when the fluid passes through the various components that make up the system. Hydraulic systems consist of several components including pipework, filters, valves, coolers, and cylinders, as well as pumps and motors. Each component has some influence on the total power loss of the system. System efficiency is inversely proportional to the power loss. Along with the system components, temperature, pressure, and lubricant formulation also have an impact on the total efficiency of the system. Results from a series of tests utilizing a specifically instrumented hydrostatic drive system were used to quantify the power losses from all the major components over a wide range of pressures and temperatures. This paper focuses on the effects of temperature on the system and component efficiencies relative to the lubricant formulations.
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