1. Watch the color of the hydraulic oil, such as the oil is milky and cloudy, indicating that the oil contains water.

2. Dip a dry cotton paper in hydraulic oil and then burn it. If there is a patting sound, it indicates that the hydraulic oil contains water.

3. Take a little hydraulic oil to view in the sun, if there is a luminous point, or use two fingers to dip the hydraulic oil friction, if you feel a sense of particles, it indicates that the hydraulic oil is the remaining oil at the bottom of the tank or there are impurities in the oil, which is easy to cause hydraulic parts wear and stop rod can not move the phenomenon.

What are the causes of black hydraulic oil?

The effect of metal impurities

1, the most likely is the high-speed rotation of the pump caused by the grinding chips, and all parts of the pump rotation you have to take into account, such as bearings, volume chamber wear;

2. The hydraulic valve spool runs back and forth, and the grinding dust generated by the back and forth operation of the cylinder is generated, but this phenomenon will not occur in a short time;

3, the new machine will produce a lot of iron filings in the equipment run-in, I do not know whether you will empty the hydraulic oil in the oil tank when you change the oil, and after the new oil circulation system, the oil tank is wiped clean with cotton cloth and then added new oil, if not, there may be a lot of iron filings left in the oil tank, it will also lead to the new oil is polluted and black.

External environmental impact

Check that your hydraulic system is closed and your breathing hole is intact; Check the exposed parts of the hydraulic part of the equipment to see if the seal is intact, such as the dust ring of the oil cylinder.

1, change the hydraulic oil did not change clean;

2, the oil seal aging;

3. The working environment of the excavator is too poor to block the filter element;

4, the hydraulic pump into the air has a large number of bubbles;

5, the hydraulic tank is connected with the air, the dust in the air, the impurities will enter the tank for a long time, and the oil will definitely be dirty;

6, if the oil particle size test meets the cleanliness requirements, it can be excluded from dust pollution. It is certain that the temperature of the hydraulic oil is higher.

What are the precautions for replacing hydraulic oil?

Choose the right hydraulic oil, and replace the hydraulic oil correctly. There are the following points to note in the process of replacing hydraulic oil:

1, before replacing the original hydraulic oil, check the return oil filter, oil suction filter, pilot filter, to see if there is iron filings copper filings or other impurities, if there may be hydraulic component failure, repair and remove, clean the system.

2. When changing hydraulic oil, all hydraulic oil filters (return oil filter, oil suction filter, pilot filter) must be replaced at the same time, otherwise it is equivalent to not changing hydraulic oil.

3. Identify the hydraulic oil label. Different labels and different brands of hydraulic oil are not mixed, which may react and deteriorate to produce flocculent. Recommended use of the excavator specified oil.

4, the oil filter must be installed before refueling. The pipe mouth covered by the oil suction filter leads directly to the main pump, and the impurities into the light will accelerate the wear of the main pump, and the heavy will hit the pump.

5, oil to the standard position. There is generally an oil level gauge on the hydraulic tank, look at the table. Pay attention to the parking method, generally all cylinders are recovered, that is, the forearm and bucket are fully extended and landed.

6, after the oil is added, pay attention to the main pump to exhaust air, otherwise the light is temporarily no action of the whole car, the main pump abnormal sound (air sonic boom), the heavy air pocket damage the main pump. The air exhaust method is to loosen the pipe joint directly at the top of the main pump and fill it directly.

Finally, especially to share with you, the owner of the necessary hydraulic pump maintenance knowledge

When I asked, "Boss, how did your hydraulic pump break?" At the same time, the boss often said to me very depressed: "Two years did not change the oil, thought it was OK!" ", "dropped a filter screw into, broken!" More wonderful people, "When adding hydraulic oil, I accidentally dropped a piece of concrete, thinking that the filter can filter it!" ... The hydraulic pump damage caused by improper maintenance is regrettable!

The following 4 points are the maintenance instructions sorted out by me according to years of hydraulic pump maintenance experience. I hope that all excavator owners do not have a lucky mind, check frequently, and change oil frequently!

1. Daily check the fasteners of the hydraulic pump, such as: whether the screws are loose, whether the pipeline interface leaks oil, and whether the oil seal is clean.

2, hydraulic oil pollution has fatal damage to the hydraulic pump, the maximum cycle of hydraulic oil replacement is 2000 hours, and the excavator with more than 10,000 hours is recommended to change the oil for 1500 hours.

3, daily check whether the hydraulic oil is sufficient, whether it is black, water content and whether there is odor.

4, after a long time of shutdown or pump repair and pump change, need to carry out oil injection and exhaust operation.

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