Preventive measures for oil leakage in the hydraulic system of Sany 485 hydraulic pump engineering machinery

2025-08-19

Oil leakage is a common fault phenomenon in hydraulic machinery, especially in the hydraulic system of construction machinery. It is mainly caused by pressure differences and gaps between hydraulic components and pipelines when the liquid moves around, resulting in oil leakage. Furthermore, harsh working conditions can also have a certain impact on the sealing of construction machinery. Once a hydraulic system leaks oil, it will cause the system pressure to not rise, and hydraulic oil leakage will also cause environmental pollution, affecting production and even causing incalculable serious consequences.

There are two main types of oil leakage in the hydraulic system of imported excavator parts and construction machinery: fixed seal leakage and motion seal leakage. The fixed seal leakage mainly includes the cylinder bottom and the joints of various pipe joints, while the motion seal mainly includes the piston rod of the oil cylinder, the valve stem of the multi way valve, and other parts. From the perspective of oil leakage, it can also be divided into external oil leakage and internal oil leakage. External oil leakage mainly refers to the leakage of hydraulic oil from the system to the environment, while internal oil leakage refers to the flow of hydraulic oil from the high-pressure side to the low-pressure side inside the system due to the pressure difference between the high and low-pressure sides and the failure of seals.

The factors that contribute to the oil leakage in the hydraulic system of construction machinery formed by the components of Liugong excavator are the result of multiple factors. With existing technology and data, it is difficult to fundamentally eliminate the oil leakage in the hydraulic system. Only by starting from the above factors that affect hydraulic system oil leakage, adopting reasonable methods to minimize hydraulic system oil leakage as much as possible. In the planning and processing stages, it is necessary to fully consider the important factors that affect oil leakage, such as the planning and processing of sealing grooves. In addition, the selection of sealing components is also very important. If the factors affecting oil leakage are not fully considered, it will bring incalculable losses to future production. Choose the correct installation and repair methods, and draw on past experience. For example, in the installation of the sealing ring, try to use specialized tools and apply some lubricating grease on the sealing ring. In the control of hydraulic oil pollution, we should start from the source of pollution, strengthen the control of pollution sources, and adopt effective filtration methods and regular oil quality inspections. To effectively block the pollution of external factors (water, dust, particles, etc.) on hydraulic cylinders, some protective measures can be added. In short, the prevention and control of oil spills must be comprehensively addressed and comprehensively considered in order to achieve effective results.