Pollutants in new oil: Although the hydraulic oil is refined and processed under relatively clean environmental conditions, it is polluted by pipelines, oil drums and oil storage tanks during transportation and storage, and some dust, sand, rust, moisture and other liquids will be mixed in the oil.

外界侵入污染物：液压元件以及机械工作过程中，由于油箱密封不完善，元件密封和防护装置损坏等原因，由系统外部侵入些污染物，如灰尘、砂土、水分等。

External invading pollutants: during the working process of hydraulic components and machinery, some pollutants, such as dust, sand, moisture, etc., are invading from the outside of the system due to imperfect sealing of oil tank, damage of component sealing and protective device.

元件和系统中残留的污染物：液压元件和液压系统在加工、装配和清洗过程中会由于清理工作进行得不全而残留一些污染物。

Residual pollutants in components and systems: some pollutants will remain during the processing, assembly and cleaning of hydraulic components and systems due to incomplete cleaning.

液压系统内部生成的污染物：液压系统在工作中自身会生成一些固态颗粒污染物，其中既有液压元件磨损和腐蚀而产生的金属颗粒或橡胶粉末，又有油液氧化产生的污染物等。

Pollutants generated inside the hydraulic system: the hydraulic system will generate some solid particle pollutants during its work, including both metal particles or rubber powder caused by wear and corrosion of hydraulic components and pollutants caused by oil oxidation.

设备液压泵的吸油口应安装粗滤器，且吸油口处应距油箱底部相应距离；出油口处应安装高压精滤器，且过滤效果应按照系统的工作要求，以免污物堵塞而引起液压系统故障；装载机的液压油箱隔板上应加装过滤网，以除去回油过滤器未滤去的杂质。

The oil suction port of the equipment hydraulic pump shall be installed with a coarse filter, and the oil suction port shall be at a corresponding distance from the bottom of the oil tank; High pressure fine filter shall be installed at the oil outlet, and the filtering effect shall be in accordance with the working requirements of the system to avoid the hydraulic system failure caused by dirt blockage; A filter screen shall be installed on the diaphragm of the hydraulic oil tank of the loader to remove the impurities not filtered by the oil return filter.

设备液压缸上应安装金属防护圈，以免污物被带进缸内，并可避免泥水和光辐射对液压缸侵蚀而引起泄漏；液压元器件安装前应检查、清理干净其内侧的铁屑及杂质；定期检查液压油，一旦发现油液变质、泡沫多、沉淀物多、油水分离等现象后应进行清洗系统并换油。

Metal protective ring shall be installed on the hydraulic cylinder of the equipment to prevent dirt from being brought into the cylinder, and to avoid leakage caused by erosion of mud water and light radiation on the hydraulic cylinder; Check and clean the iron filings and impurities inside the hydraulic components before installation; Regular inspection of hydraulic oil, once the oil deterioration, foam, sediment and oil-water separation and so on, cleaning system and oil change should be carried out.

新油加入装载机的油箱前应经过静置沉淀，过滤后方可加入，需要时可设中间油箱以进行新油的沉淀和过滤，保障油液的清洁

Before the new oil is added into the oil tank of the loader, it shall be added after static sedimentation and filtration. If necessary, an intermediate oil tank can be set to precipitate and filter the new oil to ensure the cleanness of the oil

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