When hydraulic oil is observed in a clean mineral water bottle, it is bright yellow and very transparent. The qualified hydraulic oil has no black hair and white, no bubbles, no flocculent floating objects and sediments. So what are the reasons for the discoloration of forklift hydraulic oil?

1.新叉车会产生大量铁屑。不知道换油时是否清空了油箱中的液压油，并在使用新的油循环系统后擦拭在添加新油之前，用棉布清洁油箱。如果不存在油，则油箱中可能残留大量铁屑，这也将导致新油被污染和变黑。

1. The new forklift will produce a lot of scrap iron. I don't know whether the hydraulic oil in the oil tank is emptied during oil change and wiped after using the new oil circulation system. Before adding new oil, clean the oil tank with cotton cloth. If there is no oil, a large amount of iron filings may remain in the tank, which will also cause the new oil to be contaminated and blackened.

2.泵的旋转可能会导致磨损。要考虑与泵一起旋转的零件，例如轴承和容积室的磨损。

2. The rotation of the pump may cause wear. Consider the wear of parts rotating with the pump, such as bearings and volume chambers.

3.检查叉车的液压系统是否关闭以及呼吸孔是否完好；检查设备液压部分的裸露部分，以查看密封是否完好，例如油缸的防尘环。如果油的粒度测试符合清洁度要求，则可以排除粉尘污染。可以说，这是由于液压油温度升高引起的。此时，应更换液压油，检查回油过滤器元件，散热油回路，重要的是液压油散热器，应按规定进行维护。

3. Check whether the hydraulic system of the forklift is closed and whether the breathing hole is intact; Check the exposed part of the hydraulic part of the equipment to see whether the seal is intact, such as the dust ring of the oil cylinder. If the oil particle size test meets the cleanliness requirements, dust pollution can be eliminated. It can be said that this is caused by the increase of hydraulic oil temperature. At this time, replace the hydraulic oil, check the oil return filter element and heat dissipation oil circuit. The important thing is the hydraulic oil radiator, which should be maintained according to the regulations.

4.液压系统中的黑油不是由灰尘引起的，而是由不规则的油脂填充引起的。

4. The black oil in the hydraulic system is not caused by dust, but by irregular grease filling.

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