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Important Properties of Hydrostatic Transmission Fluids
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English
Abstract
The properties a user should look for in hydrostatic transmission oils depend on the design of the transmission and the environment in which it is expected to operate. Important properties are: antiwear, oxidation stability, antirust, demulsibility, cavitation and air entrainment, bulk modulus (compressibility), seal conditioning, viscosity and viscosity index.
Some single graded crankcase oils can be used, but their composition is changed frequently to meet changing crank-case requirements and all of the desired properties may not be included. Desired features are available in hydraulic oils specifically designed and proven in hydrostatic transmissions. For out-of-doors service a shear stable, high VI oil with a viscosity of 200 SSU at 100 F is recommended.
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Citation
Den Herder, M., "Important Properties of Hydrostatic Transmission Fluids," SAE Technical Paper 660593, 1966, https://doi.org/10.4271/660593.Also In
References
- Leslie R. L. “Views on Petroleum Oils for Hydraulic Service.” Paper presented at National Petroleum Refiners Association Fuels and Lubricants Meeting New York September 1965
- Eisenberg Phillip “Cavitation.” International Science and Technology 14 February 1963 72 84
- Nagel B. E. “Evaluation of the Foaming Tendencies of Automatic Transmission Fluids.” Paper 77-4C presented at SAE National Fuels and Lubricants Meeting Tulsa October 1963
- Hayward A. T. J. “The Compressibility of Hydraulic Fluids.” Journal of the Institute of Petroleum 51 494 February 1965 35 48