Selection should include types and characteristics required for the hydraulic system. Fluid characteristics include
- rust and oxidation
- thermal stability
- hydrolytic stability
- low chemical corrosiveness
- high anti-wear characteristics
- low tendency to cavitate
- fluid life, disposability (according to federal, state, and local laws and regulations)
- foaming
- total water rejection
- constant viscosity, regardless of temperature.
Selection should take into consideration
- maximum and minimum operating and ambient temperatures
- pumps used
- operating pressures and cycle
- loads encountered by all components
- control and power valve types.
Process/Skill Questions:
- Where can you find information about the type and quality of hydraulic fluid needed?
- What is the purpose of hydraulic fluid?
- Why is it important to always consult the owner’s manual or review the manufacturer recommendations regarding hydraulic fluid selection?