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Proper maintenance is crucial for the service life and operational reliability of the Borel air compressors. I. Maintenance of the intake air filter. The air filter is a component that removes dust and impurities from the air; the filtered clean air then enters the compression chamber of the screw rotor for compression. This is because the gaps inside the screw compressor allow only particles smaller than 15μm to pass through. If the air filter element is clogged or damaged, a large amount of particles larger than 15u enter the screw compressor’s circulation system. This not only **reduces the service life of the oil filter and the fine oil separation element**, but it also allows a large number of particles to reach the bearing chambers, accelerating bearing wear and increasing the rotor clearance. As a result, the compression efficiency declines, and in severe cases, the rotors may even stick together. It is advisable to service the air filter element once a week. Unscrew the gland nut, remove the air filter element, and use compressed air at a pressure of 0.2–0.4 Mpa to blow away dust particles from the outer surface of the filter element. Clean any dirt on the inner wall of the filter housing with a clean cloth. Reinstall the air filter element, making sure that the sealing ring at the front end of the element fits tightly against the inner surface of the air filter housing. The maintenance of the diesel engine air filter for diesel-powered screw compressors should be carried out simultaneously with that of the air filter in Borel air compressors, using the same maintenance methods. Under normal conditions, the air filter should be replaced every 1,000–1,500 hours. In environments with particularly harsh conditions, such as mines, ceramic factories, and cotton textile mills, it is recommended to replace the air filter every 500 hours. When cleaning or replacing the air filter element, the components must be aligned one by one to prevent foreign objects from entering the intake valve. It is necessary to regularly check whether the intake flex tube is damaged or flattened, and whether the connection between the flex tube and the air filter intake valve is loose or leaking. If any issues are found, they must be repaired or replaced promptly. II. Replacement of the oil filter. After 500 hours of operation for the first time, the oil filter element should be replaced. Use a special wrench to unscrew the filter element in a counter-clockwise direction; when installing a new element, it is advisable to use screw-on oil. Tighten the seal of the filter element by turning it back into the filter holder with both hands, applying firm pressure. It is recommended to replace the filter element every 1,500–2,000 hours; it is best to change the oil filter element at the same time as the engine oil. In harsh environments, the replacement interval should be shortened. It is strictly prohibited to use the oil filter element beyond its designated lifespan; otherwise, due to severe clogging of the filter element, the pressure difference will exceed the threshold that the bypass valve can withstand, causing the bypass valve to open automatically. As a result, large amounts of contaminants and particles will enter the screw compressor along with the oil, leading to serious consequences. The replacement of the diesel engine oil filter element and diesel fuel filter element in diesel-driven screw compressors should be carried out in accordance with the diesel engine maintenance requirements, and the replacement method is similar to that of the screw compressor oil filter element. III. Maintenance and replacement of the oil fine separator. The fine oil separator is a component that separates the screw compressor lubricant from compressed air. Under normal operating conditions, its service life is around 3000 hours; however, the quality of the lubricant and the precision of air filtration have a significant impact on its lifespan. It is evident that in harsh operating conditions, the maintenance and replacement cycle of the air filter element must be shortened, and even the installation of a pre-filter should be considered. The oil fine separator must be replaced when it reaches the end of its service life or when the pressure difference before and after it exceeds 0.12 Mpa. Otherwise, it will cause the motor to overload and the oil fine separator to break down, resulting in oil leakage. Replacement method: Remove the various control pipe connectors installed on the fuel tank cover. Remove the oil return pipe that extends into the oil tank from the lid of the oil tank, and unscrew the fastening bolts on the lid of the oil tank. Remove the lid from the oil and gas tank and take out the fine oil separator. Remove the asbestos pads and dirt stuck to the upper cover. Install a new oil fine separator; be sure to staple the upper and lower asbestos gaskets in place. When pressing them down, the asbestos gaskets must be arranged neatly, otherwise it may cause problems. Reinstall the upper cover, oil return pipe, and various control pipes as they were, and check for any leaks. IV. Maintenance and replacement of screw machine oil. The quality of screw oil has a decisive impact on the performance of injection screw compressors. High-quality oil features good antioxidant stability, rapid separation, excellent defoaming properties, high viscosity, and strong corrosion resistance; therefore, users must use genuine screw oil designed specifically for our company. The first oil change should be performed after 500 hours of operation during the machine’s running-in period, and thereafter new oil should be replaced every 2000 hours of operation. It is best to replace the oil filter at the same time as changing the oil. Using it in harsh environments shortens the replacement cycle. Replacement method: Start the Bolete air compressor and run it for 5 minutes to raise the oil temperature above 50°C, thereby reducing the viscosity of the oil. Stop operation; when there is a pressure of 0.1 Mpa in the oil and gas tank, open the drain valve at the bottom of the tank and connect it to the oil storage tank. The oil drain valve should be opened slowly to prevent lubricant from splashing under pressure and causing injury or contamination. Close the drain valve once the lubricating oil becomes droplet-shaped. Unscrew the oil filter element, drain all the lubricating oil from the various pipelines, and replace it with a new one. Open the fuel filler plug, pour in new oil to keep the oil level within the range indicated by the dipstick, tighten the filler plug, and check for any leaks. During use, lubricating oil must be checked regularly; when the oil level is found to be too low, fresh oil should be added promptly. Condensate water also needs to be drained frequently while using the lubricating oil – generally once a week, and in hot climates, every 2-3 days. If the machine has been shut down for more than 4 hours and there is no pressure in the oil and gas tank, open the drain valve to release the condensed water; once organic oil begins to flow out, close the valve immediately. It is strictly prohibited to mix lubricants of different brands. Never use lubricants beyond their expiration date, as this will lead to a decline in their quality, poor lubricating properties, and a lower flash point; this can easily result in shutdowns due to high temperatures as well as spontaneous combustion of the oil. V. Maintenance of the cooler. The efficiency of heat dissipation by the cooler directly affects the operating temperature of the Bolete air compressor. The plate-fin structure is prone to dust accumulation; therefore, for the maintenance of the cooler, it is necessary to use dry compressed air at a pressure of 0.4 Mpa or higher to blow from top to bottom during each shift. The cooler of the diesel screw compressor is vertical; during maintenance, it is necessary to use dry compressed air at a pressure of 0.4 Mpa or higher to blow from the outside inward. After blowing, the dust and particles inside the air guide cover must be removed to prevent them from being blown back into the cooler by the fan, which could cause blockages and lead to high temperatures in the machine. If the machine is used in harsh environments and the surface of the cooler is covered in oil, it must be cleaned using a carbon-cleaning agent. Proper maintenance is crucial for the service life and operational reliability of the Borel air compressors. I. Maintenance of the intake air filter. The air filter is a component that removes dust and impurities from the air; the filtered clean air then enters the compression chamber of the screw rotor for compression. This is because the gaps inside the screw compressor allow only particles smaller than 15μm to pass through. If the air filter element is clogged or damaged, a large amount of particles larger than 15u enter the screw compressor’s circulation system. This not only **reduces the service life of the oil filter and the fine oil separation element**, but it also allows a large number of particles to reach the bearing chambers, accelerating bearing wear and increasing the rotor clearance. As a result, the compression efficiency declines, and in severe cases, the rotors may even stick together. It is advisable to service the air filter element once a week. Unscrew the gland nut, remove the air filter element, and use compressed air at a pressure of 0.2–0.4 Mpa to blow away dust particles from the outer surface of the filter element. Clean any dirt on the inner wall of the filter housing with a clean cloth. Reinstall the air filter element, making sure that the sealing ring at the front end of the element fits tightly against the inner surface of the air filter housing. The maintenance of the diesel engine air filter for diesel-powered screw compressors should be carried out simultaneously with that of the air filter in Borel air compressors, using the same maintenance methods. Under normal conditions, the air filter should be replaced every 1,000–1,500 hours. In environments with particularly harsh conditions, such as mines, ceramic factories, and cotton textile mills, it is recommended to replace the air filter every 500 hours. When cleaning or replacing the air filter element, the components must be aligned one by one to prevent foreign objects from entering the intake valve. It is necessary to regularly check whether the intake flex tube is damaged or flattened, and whether the connection between the flex tube and the air filter intake valve is loose or leaking. If any issues are found, they must be repaired or replaced promptly. II. Replacement of the oil filter. After 500 hours of operation for the first time, the oil filter element should be replaced. Use a special wrench to unscrew the filter element in a counter-clockwise direction; when installing a new element, it is advisable to use screw-on oil. Tighten the seal of the filter element by turning it back into the filter holder with both hands, applying firm pressure. It is recommended to replace the filter element every 1,500–2,000 hours; it is best to change the oil filter element at the same time as the engine oil. In harsh environments, the replacement interval should be shortened. It is strictly prohibited to use the oil filter element beyond its designated lifespan; otherwise, due to severe clogging of the filter element, the pressure difference will exceed the threshold that the bypass valve can withstand, causing the bypass valve to open automatically. As a result, large amounts of contaminants and particles will enter the screw compressor along with the oil, leading to serious consequences. The replacement of the diesel engine oil filter element and diesel fuel filter element in diesel-driven screw compressors should be carried out in accordance with the diesel engine maintenance requirements, and the replacement method is similar to that of the screw compressor oil filter element. III. Maintenance and replacement of the oil fine separator. The fine oil separator is a component that separates the screw compressor lubricant from compressed air. Under normal operating conditions, its service life is around 3000 hours; however, the quality of the lubricant and the precision of air filtration have a significant impact on its lifespan. It is evident that in harsh operating conditions, the maintenance and replacement cycle of the air filter element must be shortened, and even the installation of a pre-filter should be considered. The oil fine separator must be replaced when it reaches the end of its service life or when the pressure difference before and after it exceeds 0.12 Mpa. Otherwise, it will cause the motor to overload and the oil fine separator to break down, resulting in oil leakage. Replacement method: Remove the various control pipe connectors installed on the fuel tank cover. Remove the oil return pipe that extends into the oil tank from the lid of the oil tank, and unscrew the fastening bolts on the lid of the oil tank. Remove the lid from the oil and gas tank and take out the fine oil separator. Remove the asbestos pads and dirt stuck to the upper cover. Install a new oil fine separator; be sure to staple the upper and lower asbestos gaskets in place. When pressing them down, the asbestos gaskets must be arranged neatly, otherwise it may cause problems. Reinstall the upper cover, oil return pipe, and various control pipes as they were, and check for any leaks. IV. Maintenance and replacement of screw machine oil. The quality of screw oil has a decisive impact on the performance of injection screw compressors. High-quality oil features good antioxidant stability, rapid separation, excellent defoaming properties, high viscosity, and strong corrosion resistance; therefore, users must use genuine screw oil designed specifically for our company. The first oil change should be performed after 500 hours of operation during the machine’s running-in period, and thereafter new oil should be replaced every 2000 hours of operation. It is best to replace the oil filter at the same time as changing the oil. Using it in harsh environments shortens the replacement cycle. Replacement method: Start the Bolete air compressor and run it for 5 minutes to raise the oil temperature above 50°C, thereby reducing the viscosity of the oil. Stop operation; when there is a pressure of 0.1 Mpa in the oil and gas tank, open the drain valve at the bottom of the tank and connect it to the oil storage tank. The oil drain valve should be opened slowly to prevent lubricant from splashing under pressure and causing injury or contamination. Close the drain valve once the lubricating oil becomes droplet-shaped. Unscrew the oil filter element, drain all the lubricating oil from the various pipelines, and replace it with a new one. Open the fuel filler plug, pour in new oil to keep the oil level within the range indicated by the dipstick, tighten the filler plug, and check for any leaks. During use, lubricating oil must be checked regularly; when the oil level is found to be too low, fresh oil should be added promptly. Condensate water also needs to be drained frequently while using the lubricating oil – generally once a week, and in hot climates, every 2-3 days. If the machine has been shut down for more than 4 hours and there is no pressure in the oil and gas tank, open the drain valve to release the condensed water; once organic oil begins to flow out, close the valve immediately. It is strictly prohibited to mix lubricants of different brands. Never use lubricants beyond their expiration date, as this will lead to a decline in their quality, poor lubricating properties, and a lower flash point; this can easily result in shutdowns due to high temperatures as well as spontaneous combustion of the oil. V. Maintenance of the cooler. The efficiency of heat dissipation by the cooler directly affects the operating temperature of the Bolete air compressor. The plate-fin structure is prone to dust accumulation; therefore, for the maintenance of the cooler, it is necessary to use dry compressed air at a pressure of 0.4 Mpa or higher to blow from top to bottom during each shift. The cooler of the diesel screw compressor is vertical; during maintenance, it is necessary to use dry compressed air at a pressure of 0.4 Mpa or higher to blow from the outside inward. After blowing, the dust and particles inside the air guide cover must be removed to prevent them from being blown back into the cooler by the fan, which could cause blockages and lead to high temperatures in the machine. If the machine is used in harsh environments and the surface of the cooler is covered in oil, it must be cleaned using a carbon-cleaning agent.