How to select the adapted hydraulic oil?

All quality hydraulic fluids must be capable of fulfilling the following functions:

  • Transmit power: transfer of a kinetic or potential energy (movement or pressure)
  • Lubricate and protect: protection against wear on surfaces in contact

In order to best fulfil these functions, a hydraulic fluid must have a certain number of properties, summarised below:

  • right viscosity and little variation in viscosity in relation to temperature
  • low compressibility (rapid deaeration and low foaming)

The viscosity grade has to be chosen depending on the in-service temperature. Actually, the in-service lubricant has to maintain a viscosity higher than 10-15 cts in order to lubricate the pump. OEM’s recommendations have to be followed.

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