But if the machine goes through varying temperature ranges, a high viscosity fluid is the only way to go. When the temperature is lower, an oil with lower viscosity and low pour point would work perfectly. Selecting the right kind of hydraulic oil largely depends on its viscosity. Without the lubrication, hydraulic systems would suffer a lot more damage within a short span of time. Hydraulic fluids help to protect internal parts from wear and tear. Fluids with higher viscosity index are generally able to maintain a consistent seal. To complete this sealing function, the viscosity of the fluid plays a key role. The hydraulic oil finishes the sealing job after the seals close the major clearances between parts. It is the job of the filter to segregate the contaminants from the fluid and return it to the circuit. Good quality hydraulic oils are equipped to carry solid particles as well as water away. The overheating tends to damage seals, valves and other components of the machine Though it is an energy transfer medium, a good hydraulic fluid can do so much more! It has four other significant functions - heat transfer, contamination removal, sealing, and lubrication.īefore moving further, here is a brief description of each of the functions.Īs the fluid passes through the pumps and motors, hydraulic machines generate excess heat caused by the oil particles coming in contact with metal surfaces. The core purpose of any hydraulic fluid or oil is to transmit power to a hydraulic system.
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