The working temperature of hydraulic system is generally controlled between 30～80℃ (dangerous temperature ≥100℃). Excessive oil temperature of the hydraulic system will cause: the viscosity of the oil is reduced, which is easy to cause leakage, and the efficiency is reduced; the strength of the lubricating oil film is reduced, which accelerates the wear of the machine; the formation of carbides and silt; the oxidation of the oil accelerates the deterioration of the oil quality; the oil seal, high pressure Premature aging of the hose. In order to avoid excessive temperature: do not overload the radiator for a long time; pay attention to the radiator heat sink not to be contaminated by oil to prevent dust from adhering to affect the heat dissipation effect; maintain sufficient oil to facilitate oil circulation and heat dissipation; do not work all day in the hot summer. Avoid the high temperature time at noon. When the oil temperature is too low, the oil has high viscosity, poor fluidity, high resistance, and low work efficiency; when the oil temperature is lower than 20°C, the hydraulic motors, valves, pipelines, etc. are easily damaged by sharp turns. At this time, it is necessary to warm up the engine, start the engine, and after idling at no-load for 3 to 5 minutes, increase the engine speed with the medium speed throttle, and manipulate the handle to make any action of the working device (such as the bucket of the excavator) to the limit position, and keep it at 3 ~5min to heat the hydraulic oil through overflow. If the oil temperature is lower, you need to appropriately increase the warm-up time.
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