Generally speaking, after the gas-liquid booster pump has been used for half a year or has been processed for 500000 times, when the hydraulic oil changes from clear and transparent to cloudy or milky white, it means that the hydraulic oil needs to be replaced. When adding hydraulic oil, pay attention not to be higher or lower than the oil mark range, when the hydraulic oil exceeds the upper limit, it will cause the hydraulic oil to spit out.
Hydraulic oil selection requirements
Generally speaking, hydraulic oil should meet the following requirements:
1. Suitable viscosity grade.
2. Pure, less impurities.
3. It has good lubricity, compatibility and stability.
4. It has good emulsification resistance, foam resistance, corrosion resistance and rust resistance.
5. The volume expansion coefficient is low and the specific heat capacity is high.
6. The flow point and freezing point are low, the ignition point and flash point are high.
7. It's cost-effective. It is low harmful to human body.
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