Cause analysis and treatment of discoloration of excavator cylinder
Source:铁甲工程机械网
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Author:instrument-1022132
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Published time: 2020-11-17
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Many excavator users have encountered the problem of discoloration of the cylinder, thinking that the quality of the cylinder has a problem, and they are often very anxious. In fact, the discoloration of the cylinder of the excavator is a very common phenomenon. Recognition techniques such as: Under normal circumstances, the cylinder will first It becomes blue, then the color deepens, becomes purple, and finally becomes black.
Many excavator users have encountered the problem of discoloration of the cylinder, thinking that the quality of the cylinder has a problem, and they are often very anxious. In fact, the discoloration of the cylinder of the excavator is a very common phenomenon. Recognition techniques such as: Under normal circumstances, the cylinder will first It becomes blue, then the color deepens, becomes purple, and finally becomes black.
1. The discoloration of the excavator cylinder is not the discoloration of the cylinder itself
The phenomenon that the cylinder turns black, blue or purple is actually a colored film on the cylinder surface, not the cylinder itself. Under normal circumstances, the cylinder will first turn blue, then darken, turn purple, and finally black.
2. There are many reasons for the discoloration of the excavator cylinder:
1. There is a high temperature phenomenon in the hydraulic system, and the piston rod frequently comes into contact with the low temperature environment (the temperature drops suddenly) at a high temperature during work (especially in the cold season);
2. During the maintenance cycle, the special hydraulic oil for excavators of this brand is replaced. This phenomenon generally occurs within a few days after the oil is changed. The reason is that there is an extreme pressure anti-wear additive in hydraulic oil with different quality and performance;
3. Due to uneven temperature control during the electroplating process of the piston rod, cracks appeared on the surface of the electroplating layer in the later work. When observing the surface of the piston rod with a high-power magnifying glass, small irregular cracks can be seen.
4. The blueness is caused by the additives in the oil seal and hydraulic oil attached to the cylinder rod at high temperature, and the blackening is caused by the lead-containing additives in the spray in the cup (ie wear-resistant sleeve) attached to the cylinder rod at high temperatures. .
Generally, it is caused by the hydraulic oil temperature being too high, and this phenomenon mostly occurs in the first half of the bucket cylinder that is used more often. It is recommended to clean the dirt of the radiator part frequently to ensure the heat dissipation effect.
3. How to deal with the discoloration of the excavator cylinder?
If there is a very small part of the blue in the cylinder, you can ignore it, it will disappear automatically after a period of time;
If the discoloration is serious, you need to replace the oil seal and wear sleeve, and try to avoid the high temperature of the hydraulic oil. After a while, it will return to normal.
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