Before selecting the appropriate hydraulic fluid following are the important features to be considered before:
- Pour Point
- Viscosity Grade, Viscosity Index
- Shear Stability
The features of the Hydraulic fluid must be appropriate for its operating environment units and components, following are the explanations of hydraulics fluids features:
· Viscosity: A hydraulics viscosity varies from thin to thick, when hydraulic fluid is high its viscosity gets thick and when it’s low its viscosity becomes thin. Viscosity changes with the change in temperature, the rise in temperature reduces the viscosity and vice versa, the hydraulic should always be in thin position to flow through filter. Hydraulic requires extreme pressure to work with that’s why the change in temperature of viscosity is very important. However the hydraulic fluid most not get too thin to avoid internal leakage.
· Shear Stability: Is a measured by oil changed resistance in viscosity, which is caused by oil being subjected to shear. Shear Stability uses polymer fluids in viscosity index to improve shear by 20% in service. This will help in lowering down the viscosity event at the higher temperature. Thus reduction in viscosity would be result because of mechanical stress.
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· Pour Point: are used to identify the temperature of the pour points at which the hydraulic fluids stops flowing. The starting temperature for the fluid is recommended 15 deg C or above.
Density: For higher density for the hydraulic fluids it requires adequate diameter for suction line and enough elevated tank for the positive inlet pressure. The Hydraulics fluids manufacture must have to specify the density.
· Air Release: is measured for releasing the air bubbles contained in the fluids. Air usually enters in the circuit through the suction line if seals are broken or not tight.
· Cleanliness: the level of cleanliness in hydraulic fluid can be determined by the size of particles inside the fluid or by counting numbers. The cleanliness level defines the number of particles.