液压油对于比较大的液压机来说也是一笔不小的开支，为了延长液压油的使用寿命，节约成本，我们尽量想办法保持油液清洁。造成液压机液压油污染的原因多而复杂，液压油自身又在不断的产生赃物，因此要彻底解决液压油的污染问题是很困难得。为了延长液压元件的寿命，保证液压系统可靠的工作，将液压油的污染度控制在某一限度以内是较为切实可行的方法。 为防止油液污染，在实际工作中应采取如下措施。
1.使液压油在使用前保持清洁。液压油在运输和保管过程中都会受到外界污染，新买来的液压油看上去很清洁，其实很脏，必须将其净放数天后，经过滤加入液压系统中使用。
2. Keep the hydraulic system clean after assembly and before operation. Hydraulic components must be cleaned during processing and assembly. The hydraulic system should be thoroughly cleaned after assembly and before operation, and the oil used in the system should be used for cleaning. During cleaning, the oil tank must be completely sealed except for the vent hole, and the seal must not have flash or burr.
3. Keep the hydraulic oil clean during work. The hydraulic oil will be polluted by the environment during the working process. Therefore, try to prevent air and moisture from being immersed. In order to completely eliminate the immersion of water, gas and pollutants, seal the oil tank and add air filter on the vent hole.
4. Take the appropriate oil filter. This is an important means to control the pollution of hydraulic oil. According to the requirements of the equipment, different filtering methods, different precision and different structure oil filters should be selected in the hydraulic system, and the oil filter and oil tank should be checked and cleaned regularly.
5. Replace the hydraulic oil regularly. Before replacing the new oil, the oil tank must be cleaned once. When the system is dirty, it can be cleaned with kerosene and drained such as new oil.
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