Firstly, when there are abnormal fluctuations in the working pressure and flow rate of the hydraulic system, it may indicate that the filter element has been clogged. The main function of a filter element is to filter out impurities and particulate matter from hydraulic oil, preventing them from entering key components of the hydraulic system and ensuring its normal operation. However, as the usage time increases, the filter element will gradually accumulate impurities, leading to a decrease in filtration efficiency. When the filter element becomes clogged to a certain extent, the pressure and flow rate of the hydraulic system will be affected, thereby affecting the performance and stability of the equipment. Therefore, once abnormalities are found in the working pressure and flow rate of the system, it is necessary to promptly check and replace the hydraulic oil filter element.

Secondly, the color and cleanliness of the hydraulic oil are also important criteria for determining whether the filter element needs to be replaced. Newly replaced hydraulic oil usually appears clear and transparent, but over time, various impurities and particles may mix into the oil, resulting in a darker and more turbid color. If the cleanliness of the oil drops to a certain level, it may cause wear and damage to key components of the hydraulic system. At this point, even if the filter element has not yet reached its service life, it needs to be replaced in advance to ensure the normal operation of the hydraulic system and extend the service life of the equipment.

Finally, regular maintenance and inspection are also important means to ensure timely replacement of hydraulic oil filters. According to the user manual and maintenance plan of the equipment, regularly maintain and inspect the hydraulic system, including checking the degree of blockage of the filter element, the cleanliness of the oil, and the performance of the system. Through regular maintenance and inspection, potential problems can be identified and resolved in a timely manner, ensuring the stability and reliability of the hydraulic system. Therefore, it is recommended that users perform regular maintenance and inspections according to the device's user manual and maintenance plan.