(1) prone to leakage
Because of the high oil pressure of the hydraulic system, the hydraulic oil is easy to leak through the seal or gap, internal leakage reduces the volumetric efficiency, external leakage caused by the consumption of hydraulic media, while causing environmental pollution.
(2) The viscosity of the oil changes with the temperature, causing instability in the movement of the working mechanism
Oil viscosity changes caused by resistance changes, so through the flow or leakage also changes with the temperature, which will cause the working body movement speed instability.
(3) air infiltration of hydraulic oil will cause crawling, vibration, noise
Air into the hydraulic system, due to gas compression, so from high pressure to low pressure or from low pressure to high pressure, it produces a large volume change and cause vibration, noise and creep.
(4) mineral oil as a hydraulic medium, there is a danger of combustion should pay attention to fire prevention.
(5) mineral oil and air contact will occur oxidation, so that the oil deterioration must be changed regularly.
(6) hydraulic parts of the parts processing quality (geometric accuracy, surface roughness, etc.) requires high
In order to reduce leakage, reduce friction, so it is necessary to make the parts fit the gap to be small, so the quality of parts processing requirements are higher, the cost is also increased.
