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Hydraulic Pump Performance-A Basis for Fluid Viscosity Classification
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Abstract
A series of polymer-containing fluids was evaluated in a modified ASTM D 2882 pump loop to determine both permanent viscosity loss and flow rate as a function of test time. Flow rate did not change over the course of the test. It correlated equally well with either new oil high-shear-rate viscosity or used oil kinematic viscosity.
The current ISO viscosity classification system provides no means to differentiate the levels of performance observed. It is proposed that a new, more meaningful viscosity classification system be adopted for hydraulic fluids. This system should maintain continuity with the current system, but should account for permanent viscosity loss of polymer-containing fluids. Measured low temperature properties should also be part of any new viscosity classification.
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Citation
Stambaugh, R., Kopko, R., and Roland, T., "Hydraulic Pump Performance-A Basis for Fluid Viscosity Classification," SAE Technical Paper 901633, 1990, https://doi.org/10.4271/901633.Also In
References
- Stambaugh R. L. Kopko, R. J. “Behavior of Non-Newtonian Lubricants in High Shear Rate Applications.” SAE Transactions 82, Paper 730487 1973
- Kopko R. J. Stambaugh, R. L. “Effect of VI Improver on the In-Service Viscosity of Hydraulic Fluids.” SAE Paper 750693 1975
- Leslie, R. L. “A Component Manufacturer Considers Hydraulic Oils for Mobile Service.” SAE Paper 710722 1971
- Blackwell J. W. Walters, D. K. “Developments to Ensure Adequate Hydraulic Performance of Multifunctional Oils for Construction Equipment.” Public Works Congress 1987 The British Fluid Power Association 16 2 April 1987
- Krawetz, A. A. Tovrog T. Krawetz, G. A. “Thermochemical Behavior of Fluids, Lubricants and Related Materials.” Air Force Materials Laboratory Wright Patterson Air Force Base, OH 1985
- Oene, H. van “Discussion of Papers 730486 and 730487.” SAE Transactions 82 1973