Selecting the proper hydraulic fluid viscosity grade to meet the performance requirements established by the equipment manufacturer is critical.
The application of a fluid with the optimum viscosity grade will insure peak performance over the entire operating cycle of your equipment. Improper viscosity grade selection can lead to overheating, excessive wear, or pump damage.
The National Fluid Power Association (USA) has collected the hydraulic fluid viscosity recommendations for specific pumps and motors from the major pump OEM's in NFPA Recommended Practice T2.13.13-2002. The NFPA has also collected the combined guidance of pump manufacturers, oil marketers, and fluid additive manufacturers into a simple technique for viscosity grade determination.
The following calculators allow you to select a specific pump and input the temperature operating conditions in your equipment. The proper fluid viscosity grade is then displayed based on the OEM's fluid viscosity recommendations. You may choose to view the fluid viscosity grade in NFPA or ISO standard format. You may also choose to identify a single fluid grade that is suitable to meet the OEM viscosity requirements of multiple pumps.
It is always recommended that you also directly consult with your fluid supplier and/or OEM for their specific guidance on viscosity grade selection, in combination with other fluid performance requirements. For additional guidance on pump efficiency advantages, fuel savings estimates, and the impact of viscosity index, please visit: www.DYNAVIS.net.
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