What should I do if the hydraulic cylinder of the excavator leaks oil? See here to know!

Views : 5818
Author : Toparts
Update time : 2019-11-13 14:16:10
I believe that everyone must have encountered the oil leakage of the hydraulic cylinder. For the excavator, once the hydraulic cylinder leaks, there will be a phenomenon of slow lifting and insufficient digging force. Let's start this discussion with this topic today!
      Under normal circumstances, the leakage of hydraulic cylinders is divided into internal leakage and leakage. As long as we look closely, we can judge the cause of external leakage. It is difficult to judge the internal leakage of the hydraulic cylinder, because the internal leakage is not directly observable.

1.Internal leakage
Oil leakage and oil leakage are caused by deformation, aging, wear and tear of the main oil seal.
Generally, in the long-term high-temperature and high-pressure high-speed movement, the main oil seal is easy to change and aging. Even the best oil seal has the possibility of deformation in this case, and the probability of good oil seal modification is small. After the Y-type oil seal is changed, there is no tension in the sealing lip, resulting in oil leakage.
When working, a large amount of dust and impurities will adhere to the cylinder rod. The dustproof oil seal can prevent dust and impurities from entering the cylinder and prevent damage to the cylinder and the oil seal. In the case of damage to the dust seal, the impurity dust directly enters the cylinder head and directly damages. The oil seal and the oil cylinder will wear out in the case of a large amount of dust without tens of hours of oil seal, and the inner lip is obviously worn.
The cylinder is black and the inner wall is strained. The lead of the additive in the inner wall of the spray adheres to the surface of the cylinder under long-term high-temperature friction, which means that the wear ring needs to be replaced. The wear ring (cup) is very important in the cylinder, one is for wear resistance, and the other is to eliminate the impact of lateral force. If it is not replaced after wear, the cylinder will be black, the main oil seal will seep (because the main oil seal cannot be effectively eliminated due to the impact of the lateral force), and the cylinder is pulled. Wear-resistant ring personally recommended nylon to add this material of fiberglass, because the physical properties of the wear-resistant ring of this material is comparable to that of bronze material, and it has good performance in terms of wear rate, anti-pull performance and ability to accommodate metal chips.

2. External leakage
1. Cracking of the cylinder inlet and outlet tubing joints can also cause leakage of the hydraulic cylinder.
2, oil leakage caused by defects on the cylinder block or cylinder end cover.
3, often exceeds the oil leakage caused by the pressure range of the cylinder.
4, the deterioration of the lubricating oil causes the temperature of the cylinder to rise abnormally, which causes the sealing ring to age.
5, the piston rod is pulled up to the groove, there are pits and so on.
6. The seal of the piston rod protruding end and the piston rod is damaged, mostly due to the pulling of the piston cylinder, and also caused by aging.
7, the piston rod extended end and the cylinder liner seal damage, this is mostly due to the seal aging caused by long-term use of the seal, there are many too much force on the upper end cover to seal the seal damage, there are many domestic production hydraulic cylinders The manufacturer's design is unreasonable. In most cases, the manufacturer is caused by cost savings.

Consequences of oil leakage from excavators
Lubricating oil and diesel oil may leak from the engine parts of the construction machinery and equipment. The lubricating oil of the engine oil leaks, resulting in insufficient oil level of the lubricating oil, resulting in the engine lubrication system not working properly, which leads to abnormal wear of the internal parts of the engine. The damage of the engine will cause significant damage. loss. The engine leaking diesel fuel will cause abnormal consumption of diesel fuel, increase the working cost of the excavator, and also increase the hidden danger of equipment fire accidents. Therefore, pay close attention to the lubricating oil level.

Precautions for the use of hydraulic cylinders
1. In normal use, we should pay attention to protect the outer surface of the piston rod to prevent the damage of the seals caused by bumps and scratches. Now some construction machinery cylinders are designed with protective plates. Although there are, we still have to pay attention to prevent bumps and Scratched.
2, when used normally, we also need to pay attention to check the joints of various threads and bolts frequently, and find that the looseness is immediately tightened.
3, usually we use the full-scale and full-scale test run 3-5 strokes after each use. The purpose of this is to exhaust the air in the system and preheat the systems, so as to effectively avoid the presence of air or water in the system, causing gas explosion in the cylinder block, which will damage the seals, cause cylinder leakage, etc. malfunction.
4, normal maintenance, we should pay attention to the regular replacement of hydraulic oil, timely cleaning of the system filter to ensure the cleanliness of the hydraulic oil, which is also very important for extending the life of the hydraulic cylinder.
5, often lubricate the joints to prevent rust or abnormal wear in the oil-free state is also our attention. Especially for some parts with rust, we should deal with it in time to avoid oil leakage from hydraulic cylinders caused by rust.
6, after each work is completed, we need to pay attention to the size of the arm and the bucket to maintain an optimal state, that is, to ensure that the hydraulic oil in the hydraulic cylinder is all returned to the hydraulic tank, to ensure that the hydraulic cylinder is not under pressure. Because the hydraulic cylinder is subjected to pressure in one direction for a long time, it also causes damage to the seal.
7, in normal work, we must pay attention to control the system temperature, because the oil temperature is too high will reduce the life of the seal, and long-term high oil temperature will cause permanent deformation of the seal, in severe cases will make the seal failure.
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