Selection and performance requirements of hydraulic oil:
1. Suitable viscosity and good viscosity-temperature performance
Viscosity too general assembly causes the loss of energy, heating up fast, the main oil pump will appear cavitation phenomenon.
Viscosity is too small to ensure good lubrication, increasing wear and system leakage.
Viscosity refers to the degree of change of viscosity and temperature.
2. Lubricity
The hydraulic oil is developing in a high pressure direction, and the lubrication is more important.
3. Rust prevention and corrosion resistance
Oil products are required to be rustproof, anti-corrosive, and maximum protection of metal surfaces.
4. anti-foam and air release
Air pollution is one of the causes for the failure of the hydraulic oil. Oil air in the form of the bubble oil compressibility is very small, the air compressibility. The oil pressure is low, the air from the oil spill, bubbles and cavitation. High pressure air bubbles will be break, compressed metamorphism.
5. oxidation stability
Oil run will occur at high temperature oxidation, the sludge deposit, etc. Excessive oxidation will make sludge blockage, damage to the hydraulic system.
6. resistance to water
Hydraulic oil in use process, due to the condensation, due to reasons such as easily mixed with water leakage. The existence of water will increase oil oxidation, make product other performance degradation.
7. The adaptability of the sealing material
Hydraulic oil must be adapted to various sealing materials.
8. Shear stability
When the oil fluid flows through the holes and the gaps in the ring, it is subjected to a large shear, which tends to decrease the viscosity of the oil. HV, HS and other hydraulic oil products, usually add viscosity index improver.
9. Cleanliness
The solid particles and pollutants contained in the hydraulic oil can cause the valve to bond, malfunction and worsen the oil deterioration.
10. Anti-flammability
Only the hydraulic oil under special environment work is high against flammability, such as coal mine.
11. Environmental acceptability
The biodegradability of hydraulic oil is mainly used in rural engineering machinery.
Oil change for hydraulic oil:
1.to 40 ° c kinematic viscosity changes more than 10% to 10%
2.water is greater than 0.1
3.colorimetric greater than 2
4.acid value over 35
5.the insoluble substance is greater than 0.1
6.copper plate corrosion is greater than 2a
With the development of the construction machinery, the design of the engine and hydraulic system of domestic engineering machinery is more and more synchronized with the foreign countries. The demand for oil is getting higher and higher. The domestic engineering machinery equipment is also changed from the original antifriction hydraulic oil to the non-gray grinding hydraulic oil.
The Tanks non-grey anti-wear hydraulic oil is blended in accordance with international standard. The formula is derived from the imported lubrizol non-gray additive, and the base oil is based on the base oil of two hydroisomeric dewaxing.