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Construction machinery is often used in harsh construction sites. After being in use for a period of time, it is necessary to carry out proper maintenance on such machinery to keep it in good working condition. The user manual for the equipment usually specifies in detail the requirements for lubricating each lubrication point, and the sealing rings need to be replaced promptly once they become worn out. However, investigations into actual usage conditions have shown that some drivers and maintenance personnel often ignore the aforementioned requirements. Some common mistakes include: 1. Is lubrication needed? Add some oil! Due to the differences in the operating methods and conditions of various parts of the equipment, there are strict requirements regarding the lubrication intervals for different points, the amount of oil to be added each time, and the method of addition. Drivers and maintenance personnel must adhere strictly to these requirements and must not simply add a little oil casually, as this will not suffice to meet the lubrication needs. 2. It has been lubricated; is more lubrication still needed? Due to differences in the moving parts of the equipment, its operating mode, and ambient temperature, different requirements are placed on lubricants; therefore, lubricants of various types and grades should be used as required. Only by using lubricants that contain the necessary additives and meet the required physical and chemical specifications can equipment be properly lubricated; filling it with oil without paying attention to the correct grade can cause problems. 3. Adding more lubricant can’t hurt. The structural design of the moving parts of the equipment and its operating conditions determine the amount of oil that needs to be added; these are usually specified in detail in the equipment’s user manual. Maintenance personnel should add lubricant in appropriate amounts according to the instruction manual, the oil level indicators or dipsticks provided with the equipment, as well as any observation windows; adding too much lubricant is harmful rather than beneficial. 4. It dries fast after applying lubricant! Strictly speaking, this is a misunderstanding regarding conceptual understanding; only fuel directly participates in the generation of work. Applying lubricant generally means adding it between the frictioning surfaces that are in motion, using it to fill in any unevenities and maintain a certain thickness of lubricant film. This helps to separate the two contacting surfaces, reducing frictional resistance and wear. Additionally, it serves to cool the components and provide sealing effects. These functions of boosting indirectly support the fuel in doing work. 5. There is oil leakage; replace the seal ring. In hydraulic systems, oil leakage is usually caused by the failure of seals. Sealing rings achieve sealing through elasticity (pressure). Once the sealing ring is in place, it should possess sufficient elasticity to apply pre-pressure to the contact surfaces in the absence of hydraulic pressure; in other words, its cross-section should be capable of undergoing some degree of compressive deformation ； When hydraulic pressure is applied, it is pressed to one side of the groove, where it performs a sealing function thanks to elasticity and other factors. When replacing the sealing ring, it is essential to strictly follow the instructions and use a sealing ring of the same size; otherwise, requirements such as proper compression cannot be ensured. At the same time, special attention should be paid to the fact that used sealing rings must not be used; when using new sealing rings, their surface quality must also be carefully checked. They can only be used after it is confirmed that there are no defects such as pores, protrusions, cracks, or grooves, and that they possess sufficient elasticity. There’s a oil leak; simply replacing the seal ring certainly won’t solve the problem. 6. The seal ring model is good; just put it on. When replacing the seal ring, the part of the hydraulic system that is being opened must be thoroughly cleaned to prevent impurities and dirty oil from entering the system. When installing, it is best to use special tools to prevent scratches from sharp metal edges or even fingernails. It is strictly prohibited to place the seal ring directly over the threaded part of the component. In special cases, a simple mounting tool should be made or the threaded part should be covered with plastic film, and clean hydraulic oil of the same type should be applied to the tool or film. “The idea of simply “putting it on” is essentially not feasible. 7. Spare sealing ring – just keep it somewhere. Since the sealing ring contains many additives, it tends to age and deteriorate easily. Therefore, when storing it, it is necessary to avoid exposure to sunlight, as well as prevent it from getting damp or overheated; in addition, it must not come into contact with acidic or alkaline substances. Generally, it should not be stored for more than one and a half years. They cannot be strung together with ropes or wire and hung for storage. Therefore, it is not acceptable to leave spare sealing rings around casually. 8. The oil is dirty; pour it out! Apart from the hydraulic oil that has gone rancid and deteriorated, there is still a considerable amount of hydraulic oil and lubricating oil that can be used. Hydraulic oil that merely contains metal particles can be reused after sedimentation and filtration. Oil with high levels of contamination can be used for lubricating roughing machinery and preventing rust in outdoor equipment after simple treatment; alternatively, the waste oil can be collected and submitted for recycling, which helps save energy and reduce waste. While giving up on something is convenient, it pollutes the environment and goes against the principles of sustainable development.