Cause and Solutions for Hydraulic Cylinder Oil Leakage in Excavators

The hydraulic cylinder, a vital component in excavator, often encounters oil leakage issues during usage. So, what are the reasons behind hydraulic cylinder oil leakage in excavators, and what precautions should be taken to avoid it? Here, we compile some reasons and solutions for oil leakage in hydraulic cylinders, hoping to provide assistance.

Hydraulic Cylinder:

In general, hydraulic cylinder oil leakage can be categorized into external and internal leakage.

External Leakage Causes:

1. Damage to the seal at the extended end of the piston rod, often caused by piston cylinder scratching or aging.
2. Seal damage at the interface between the extended end of the piston rod and the cylinder sleeve, typically due to prolonged use and aging or excessive force during upper cover installation.
3. Cracks in the oil pipe joints for cylinder entry and exit can also lead to hydraulic cylinder leakage.
4. Defects on the cylinder body or end cover causing oil leakage.
5. Piston rod damage, such as scratches, grooves, etc.
6. Lubricating oil deterioration causing abnormal temperature rise, accelerating seal ring aging.
7. Regularly operating beyond the cylinder's pressure range leading to oil leakage.

Oil leakage is often attributed to the deformation, aging, and wear of the main oil seal after prolonged high-temperature, high-pressure, and high-speed movements.

Internal Leakage Causes:

1. Severe wear of the piston's wear ring, causing friction between the piston and the cylinder sleeve, eventually damaging the cylinder sleeve, piston, and seals.
2. Long-term use leading to seal failure, especially piston seals (U, V, Y-rings) aging.
3. Contaminated hydraulic oil, with impurities entering the cylinder, wearing down piston seals, commonly caused by iron filings or foreign objects.

Preventive Measures:

1. Use dust seals to prevent dust and impurities from entering the cylinder, safeguarding against cylinder and seal damage.
2. Regularly inspect and replace main oil seals to prevent deformation and wear.
3. Utilize nylon-added fiberglass as a wear ring material for better performance.
4. Monitor hydraulic oil quality, ensuring cleanliness and preventing contamination.
5. Avoid operating beyond the recommended pressure range to prevent excessive stress on the cylinder.
6. In conclusion, aside from aging of seals due to prolonged usage, other causes of hydraulic cylinder oil leakage can be effectively avoided through regular maintenance and adherence to operational guidelines.

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