According to statistics, 70% of the failures of hydraulic parts are related to hydraulic oil, and about 90% of these 70% are caused by impurities. The inspection content of hydraulic oil mainly includes the following points: cleanliness, color, viscosity and consistency of hydraulic oil; in addition, there is odor. When hydraulic oil flows from the high-pressure side to the low-pressure side without mechanical work, heat is generated in the hydraulic system. If the hydraulic oil temperature is too high, it will deteriorate the expensive seals and oxidize the oil to failure, cause corrosion and form deposits, and even block the orifice and accelerate the wear of the valve. Too high temperature will cause the valve and pump to jam , The high temperature of hydraulic parts will also bring safety problems. With the help of checking the oil temperature in the fuel tank, system failures can sometimes be eliminated before serious hazards occur.
In most systems, the relief valve is the main source of heat, and too much flow through the pressure relief valve of the hydraulic fittings is another major cause of heat. Since low efficiency is related to energy loss, checking the working temperature can tell whether there is a low efficiency problem. For hydraulic systems, the control of pollutants in the oil is a major task. The sources of pollutants in hydraulic accessories are mainly The following aspects:
1. Entered with new oil.
2. Inside the system during the assembly process.
3. It enters with the surrounding air.
4. It is caused by internal wear and tear of hydraulic components.
5. Entered through leaking or damaged seals.
6. Brought in during maintenance.
