How to prevent air intrusion into hydraulic system

Hydraulic aerial work equipment contains air with a volume ratio of 6-8% in oil at normal pressure and normal temperature. When the pressure drops, the air will be freed from the oil, and the burst of bubbles will cause the components to 'cavitation' and cause noise. A lot of air entering the oil will aggravate the 'cavitation' phenomenon, increase the compressibility of the oil, unstable operation, lower operation efficiency, and 'creeping' of the performance components. In addition, the air will oxidize the oil and accelerate the deterioration of the oil. To prevent air aggression, the system must pay attention to the following points: 1. The oil suction pipe port of the oil pump must not show the oil surface, and the oil suction pipe must be well sealed. 2. After repairing and changing the oil, the air in the system must be removed according to the rules of the random 'Operation Manual' to perform normal operations. 3. The seal of the drive shaft of the oil pump should be outstanding. Pay attention to the replacement of the oil seal at this place. You should use a genuine 'double lip' oil seal instead of a 'single lip' oil seal. Because the 'single lip' oil seal can only seal oil in one direction, it does not have it. The function of sealing air.
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