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Maintenance of Hydraulic System of Aerial Work Truck

Oct. 21, 2020


The main lifting power of Aerial Platform Truck comes from the hydraulic system. The quality of a hydraulic system not only depends on the rationality of the system design and the performance of the system components, but also due to the pollution prevention and treatment of the system, the pollution of the system directly affects the hydraulic pressure According to statistics, the reliability of system work and the service life of components shows that about 70% of hydraulic system failures at home and abroad are caused by pollution.


1. The main hazards of oil contamination to the hydraulic system are as follows:


Contamination and wear of components


Various contaminants in the oil cause various forms of wear of the components, and solid particles enter the gap of the moving pair, causing cutting or fatigue wear on the surface of the part. The impact of solid particles in the high-speed liquid flow on the surface of the component causes erosion and wear. The water in the oil and the oxidation and deterioration products of the oil have a corrosive effect on the components. In addition, the air in the oil of the system causes cavitation, which leads to erosion and damage to the surface of the components.


Original blockage and clamping failure


The solid particles block the gaps and orifices of the hydraulic valve, causing blockage and clamping of the valve core, affecting the working performance, and even causing serious accidents.


Accelerate the deterioration of oil performance


The water and air in the oil are the main conditions for oil oxidation due to their thermal energy, and the metal particles in the oil play an important role in the oxidation of the oil. In addition, the water and suspended bubbles in the oil significantly reduce the movement. The strength of the oil film reduces the lubrication performance.


Aerial Platform Truck

2. Types of pollution:


Truck Mounted Aerial Platform are often operated and used in some special high-pollution environments. Therefore, pollutants are substances in the hydraulic system oil that have a harmful effect on the system. They exist in different forms in the oil. The physical form can be divided into: solid pollutants, liquid pollutants, and gaseous pollutants.


Solid pollutants:


can be divided into hard pollutants, including: diamond, cutting, silica sand, dust, wear metals and metal oxides; soft pollutants: additives, water condensate, oil decomposition products and polymers and Cotton thread and fiber brought in during maintenance.  


Liquid contaminants:


usually grooving oil, water, paint, chlorine and its halides that do not meet the system requirements, which are usually difficult to remove. Therefore, when choosing hydraulic oil, choose hydraulic oil that meets the system standards to avoid some non-compliance. Necessary failure.


Gaseous pollutants:


mainly air mixed into the system. These particles are often so small that they cannot settle down and are suspended in the oil, and are finally squeezed into the gaps of various valves. For a reliable hydraulic system, these gaps have limited control, Importance and accuracy are extremely important.


If you have more questions, please contact the Aerial Platform Manufacturer


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