If air gets into a Danfoss piston pump it can cause performance problems and possibly damage the pump or other components of the hydraulic system. Here are some steps you can take to resolve this situation: Stop the pump: If you notice that air has entered the pump, be sure to stop the pump immediately to prevent further damage. Continuing to run the pump with air in the system can lead to cavitation, reduced efficiency and potential failure. Bleeding the system: To remove air from the system, you need to bleed or purge air. The exact method of bleeding depends on the design of the hydraulic system. Refer to the manufacturer's documentation or the pump's owner's manual for instructions on how to properly bleed air from the system. This may involve loosening the exhaust valve, circulation pump, or using other methods recommended by the manufacturer. Check Fluid Level: Check the hydraulic fluid level in the reservoir. A low fluid level can cause air to enter the system. Make sure the fluid level is adequate and, if necessary, add more fluid as recommended by the manufacturer. Check for leaks: Check the hydraulic system, including hoses, fittings, and connections, for any signs of leaks. Leaks can introduce air into the system. Fix any leaks and make sure all connections are tight and properly sealed. Verify System Integrity: Check the integrity of system components such as seals, O-rings and gaskets. Damaged or worn parts can cause air leaks. Replace any faulty or worn parts as necessary. 90-L-100-KP-1-AB-60-S-4-F1-E-03-GBA-29-29-24 90L100KP1AB60S4F1E03GBA292924 90-L-100-KP-1-AB-60-S-4-F1-E-03-GBA-42-42-24 90L100KP1AB60S4F1E03GBA424224 90-L-100-KP-1-AB-61-P-3-T2-D-03-GBA-42-42-24 90L100KP1AB61P3T2D03GBA424224 90-L-100-KP-1-AB-80-D-3-S1-L-03-GBA-45-45-24 90L100KP1AB80D3S1L03GBA454524 90-L-100-KP-1-AB-80-L-3-C7-F-03-GBA-42-42-24 90L100KP1AB80L3C7F03GBA424224 90-L-100-KP-1-AB-80-L-3-T2-E-00-GBA-26-26-28 90L100KP1AB80L3T2E00GBA262628 90-L-100-KP-1-AB-80-L-3-T2-E-03-GBA-23-23-28 90L100KP1AB80L3T2E03GBA232328 90-L-100-KP-1-AB-80-P-3-C7-F-06-GBA-35-35-24 90L100KP1AB80P3C7F06GBA353524 90-L-100-KP-1-AB-80-P-3-C7-F-09-GBA-35-35-24 90L100KP1AB80P3C7F09GBA353524 90-L-100-KP-1-AB-80-P-3-F1-E-03-GBA-38-38-24 90L100KP1AB80P3F1E03GBA383824 Check for Contamination: Air sometimes enters the system due to contamination or dirty fluid. Check the hydraulic fluid for signs of contamination such as debris, water, or excessive foam. If the fluid becomes contaminated, it may need to be drained and replaced with clean hydraulic fluid. Also, check and clean all filters in the system and replace if necessary. Perform a System Flush: In cases of severe air contamination, it may be necessary to perform a system flush to remove any lingering air or contaminants. Please consult a qualified technician or Danfoss Technical Support for guidance on performing a system flush and to ensure you follow proper procedures and safety precautions. Monitor Performance: After you have bled the air from the system and resolved any potential problems, monitor the performance of the pump and hydraulic system. Watch for any unusual noises, vibrations, or unusual conditions. If any problems persist, please consider contacting Danfoss Technical Support or seek assistance from a qualified technician. Check Suction Side: Check the suction side of the hydraulic system for any possible sources of air ingress. Check suction lines, fittings and connections for leaks or loose connections. Make sure all parts are properly tightened and sealed. Check the reservoir: Check the reservoir for any potential issues that could introduce air into the system. Make sure the breather cap or vent is working properly and not letting too much air into the system. Also, check for any obstructions or blockages in the reservoir that could cause cavitation or aeration. Check the pump seals: Check the pump seals for any damage or wear that could cause air leaks. Faulty or worn seals allow air to enter the pump. Replace any damaged or worn seals with genuine Danfoss replacement parts. Check the Inlet Filter: Check the inlet filter for clogging or restriction that could cause cavitation or trapped air. Clean or replace filters as necessary to ensure proper fluid flow and prevent air from entering the system. Prime the pump: If the pump is not primed and air enters the system, it may be necessary to prime the pump to remove the air. Follow the manufacturer's instructions or consult the pump owner's manual for proper priming procedures. This usually involves filling the pump and associated lines with fluid to expel the air. Perform a system pressure test: Perform a system pressure test to ensure that the hydraulic system is operating within specification. Verify that the pressure is stable and not fluctuating excessively, as fluctuating pressure can cause air entrainment. If the pressure is not within the desired range, consult a qualified technician or Danfoss Technical Support for further guidance. Maintain Proper Fluid Levels: Regularly check and maintain the hydraulic fluid level in the reservoir. A low fluid level increases the possibility of air entering the system. Make sure the fluid level remains within the recommended operating range. Preventive Maintenance: Implement a regular preventive maintenance program for hydraulic systems. This includes periodic inspections, fluid changes, and component replacements as recommended by the manufacturer. Proper maintenance helps prevent problems such as air entrapment and ensures reliable operation of Danfoss piston pumps. Purging Air from the System: Depending on the design of the hydraulic system, there may be specific procedures for purging air from the system. Follow the manufacturer's instructions or consult your system's user manual for guidance. This may involve opening the vent valve, circulation pump, or using other recommended methods to remove air from the system. 90-L-100-KP-1-AB-80-P-3-F1-E-03-GBA-42-42-24 90L100KP1AB80P3F1E03GBA424224 90-L-100-KP-1-AB-80-P-3-F1-F-00-GBA-42-42-24 90L100KP1AB80P3F1F00GBA424224 90-L-100-KP-1-AB-80-P-3-F1-F-03-GBA-42-42-24 90L100KP1AB80P3F1F03GBA424224 90-L-100-KP-1-AB-80-P-3-S1-E-03-GBA-35-35-24 90L100KP1AB80P3S1E03GBA353524 90-L-100-KP-1-AB-80-P-3-S1-E-03-GBA-38-38-24 90L100KP1AB80P3S1E03GBA383824 90-L-100-KP-1-AB-80-P-3-S1-E-03-GBA-42-42-24 90L100KP1AB80P3S1E03GBA424224 90-L-100-KP-1-AB-80-P-3-S1-F-03-GBA-23-23-24 90L100KP1AB80P3S1F03GBA232324 90-L-100-KP-1-AB-80-P-3-S1-F-03-GBA-35-35-24 90L100KP1AB80P3S1F03GBA353524 90-L-100-KP-1-AB-80-P-3-T2-E-03-GBA-35-35-24 90L100KP1AB80P3T2E03GBA353524 90-L-100-KP-1-AB-80-P-3-T2-E-03-GBA-42-42-24 90L100KP1AB80P3T2E03GBA424224 Monitor for air bubbles: After purging the air, monitor the system for any remaining air bubbles. Air bubbles can cause erratic pump operation and reduced performance. If you notice any looseness or inconsistent behavior in your hydraulic system, it could indicate the presence of air. Repeat the cleaning process or consult a technician for further assistance. Check for damaged parts: Check system components, such as hoses, fittings, and seals, for any signs of damage or wear that could lead to air leaks. Replace any damaged parts with genuine Danfoss parts to ensure a proper seal against deeper air ingress. Review System Design and Layout: Evaluate the overall system design and layout to identify any potential areas where air could enter the system. Pay attention to the positioning of hoses, connections and components to minimize the risk of air entering the hydraulic system. Consult a hydraulics specialist or Danfoss Technical Support for advice on optimizing your system design. Consider operating conditions: Evaluate the operating conditions under which air ingress occurs. Factors such as temperature, pressure, and fluid properties can affect the likelihood of air entering a system. Adjusting operating parameters or implementing other measures, such as improved filtration or fluid conditioning, may help prevent future air-related problems. Training and Operator Awareness: Ensure operators and maintenance personnel are trained in proper procedures for handling and maintaining hydraulic systems. Educate them about the risks and consequences of air ingress and the importance of regular maintenance, inspections and troubleshooting to minimize such problems. Remember, if you experience persistent air ingress or are unsure of any step in the troubleshooting process, it is recommended that you seek the assistance of a qualified hydraulic technician or contact Danfoss Technical Support. They can provide dedicated guidance and expertise on your specific Danfoss piston pump and hydraulic system.