If the suction port of the plunger pump is empty, it means that no hydraulic oil is reaching the pump. In this case you can do the following: 1. Check the liquid level: Check whether the hydraulic oil tank or the liquid level in the oil tank is sufficient. If the fluid level is too low, an empty suction port may be the cause. Add the appropriate hydraulic fluid to the reservoir to the recommended level, making sure the hydraulic fluid meets the manufacturer's specifications. 2. Check for blockage: Check the oil suction line and filter for any blockage or restriction. A clogged suction line or clogged filter will prevent the pump from effectively drawing hydraulic fluid. Remove any blockage or replace a clogged filter to restore normal fluid flow to the suction port. 3. Check for air leaks: Check for air leaks in the oil suction line and connections. An air leak breaks the vacuum needed to draw in the liquid, leaving the suction port empty. Make sure all connections are tight and leak-free. Repair or replace any damaged parts that allow air to enter. ER-R-100B-LB-25-20-NN-N-3-S1AP-A1N-AAA-NNN-NNN ERR100BLB2520NNN3S1APA1NAAANNNNNN ER-R-100B-LB-25-20-NN-N-3-S1BP-A1N-NNN-NNN-NNN ERR100BLB2520NNN3S1BPA1NNNNNNNNNNNN ER-R-100B-LB-25-20-NN-N-3-S1NL-A1N-NNN-NNN-NNN ERR100BLB2520NNN3S1NLA1NNNNNNNNNNNN ER-R-100B-LB-25-20-NN-N-3-S1VP-A1N-NNN-NNN-NNN ERR100BLB2520NNN3S1VPA1NNNNNNNNNNNN ER-R-100B-LB-25-20-NN-N-3-S2NL-A1N-AAA-NNN-NNN ERR100BLB2520NNN3S2NLA1NAAANNNNNN ER-R-100B-LB-25-20-NN-N-3-S2VP-A1N-AAA-NNN-NNN ERR100BLB2520NNN3S2VPA1NAAANNNNNN ER-R-100B-LB-25-20-NN-N-3-S2VP-A1N-NNN-NNN-NNN ERR100BLB2520NNN3S2VPA1NNNNNNNNNNNN ER-R-100B-LB-25-21-NN-N-3-S1AP-A1N-NNN-NNN-NNN ERR100BLB2521NNN3S1APA1NNNNNNNNNNNN ER-R-100B-LB-26-20-NN-N-3-S2BP-A1N-NNN-NNN-NNN ERR100BLB2620NNN3S2BPA1NNNNNNNNNNNN ER-R-100B-LB-28-14-NN-N-3-S4NL-A1N-NNN-NNN-NNN ERR100BLB2814NNN3S4NLA1NNNNNNNNNNNN ER-R-100B-LB-28-20-NN-N-3-S2BP-A1N-AAA-NNN-NNN ERR100BLB2820NNN3S2BPA1NAAANNNNNN ER-R-100B-LS-10-10-NN-N-3-K5NP-A1N-NNN-NNN-NNN ERR100BLS1010NNN3K5NPA1NNNNNNNNNNNN ER-R-100B-LS-10-10-NN-N-3-S1CP-A1N-AAA-NNN-NNN ERR100BLS1010NNN3S1CPA1NAAANNNNNN ER-R-100B-LS-10-10-NN-N-3-S1NL-A1N-AAA-NNN-NNN ERR100BLS1010NNN3S1NLA1NAAANNNNNN ER-R-100B-LS-10-20-NN-N-3-K5CP-A1N-AAA-NNN-NNN ERR100BLS1020NNN3K5CPA1NAAANNNNNNN ER-R-100B-LS-10-20-NN-N-3-S1CP-A1N-NNN-NNN-NNN ERR100BLS1020NNN3S1CPA1NNNNNNNNNNNN ER-R-100B-LS-10-20-NN-N-3-S2CP-A1N-AAA-NNN-NNN ERR100BLS1020NNN3S2CPA1NAAANNNNNN ER-R-100B-LS-12-20-NN-N-3-S1AP-A1N-NNN-NNN-NNN ERR100BLS1220NNN3S1APA1NNNNNNNNNNNN ER-R-100B-LS-12-20-NN-N-3-S2AP-A1N-NNN-NNN-NNN ERR100BLS1220NNN3S2APA1NNNNNNNNNNNN ER-R-100B-LS-14-12-NN-N-3-K5NL-A1N-AAA-NNN-NNN ERR100BLS1412NNN3K5NLA1NAAANNNNNN ER-R-100B-LS-14-20-NN-N-3-K5CP-A1N-AAA-NNN-NNN ERR100BLS1420NNN3K5CPA1NAAANNNNNN 4. Priming the pump: If the pump has lost priming, priming may be required to remove any air bubbles and establish the necessary suction. See your pump's manual or manufacturer's guide for specific start-up instructions. The priming procedure usually involves filling the pump and suction line with hydraulic oil to eliminate air and create a proper seal. 5. Check the inlet filter: If the plunger pump is equipped with an inlet filter or screen, check for any debris or blockage. A clogged inlet filter can restrict fluid flow and cause the suction port to become empty. Clean or replace filters as needed to ensure unrestricted fluid flow. 6. Inspect pump components: Inspect plunger pump components such as seals, valves, and pistons for any damage or wear. Component failure or wear can cause poor oil suction and empty suction ports. Repair or replace any damaged parts to restore pump to normal operation. 7. Consult a Professional: If you have checked fluid levels, cleared any blockages, and resolved the underlying problem, but the suction port is still empty, it is recommended to consult a hydraulics professional or contact the pump manufacturer for further assistance. They can provide guidance and expertise in diagnosing and solving specific problems. ER-R-100B-LS-14-20-NN-N-3-S1NL-A1N-NNN-NNN-NNN ERR100BLS1420NNN3S1NLA1NNNNNNNNNNNN ER-R-100B-LS-14-20-NN-N-3-S1RP-A1N-NNN-NNN-NNN ERR100BLS1420NNN3S1RPA1NNNNNNNNNNNN ER-R-100B-LS-14-20-NN-N-3-S2CP-A1N-AAA-NNN-NNN ERR100BLS1420NNN3S2CPA1NAAANNNNNN ER-R-100B-LS-14-20-NN-N-3-S2NP-A1N-AAA-NNN-NNN ERR100BLS1420NNN3S2NPA1NAAANNNNNN ER-R-100B-LS-14-21-NN-N-3-K5NP-A1N-NNN-NNN-NNN ERR100BLS1421NNN3K5NPA1NNNNNNNNNNNN ER-R-100B-LS-14-24-NN-N-3-K5NL-A1N-NNN-NNN-NNN ERR100BLS1424NNN3K5NLA1NNNNNNNNNNNN ER-R-100B-LS-14-24-NN-N-3-K5NP-A1N-NNN-NNN-NNN ERR100BLS1424NNN3K5NPA1NNNNNNNNNNNN ER-R-100B-LS-15-20-NN-E-3-S1BP-A1N-NNN-NNN-NNN ERR100BLS1520NNE3S1BPA1NNNNNNNNNNNN ER-R-100B-LS-15-20-NN-N-3-S1LP-A1N-NNN-NNN-NNN ERR100BLS1520NNN3S1LPA1NNNNNNNNNNNN ER-R-100B-LS-15-20-NN-N-3-S1NP-A1N-NNN-NNN-NNN ERR100BLS1520NNN3S1NPA1NNNNNNNNNNNN ER-R-100B-LS-15-20-NN-N-3-S4BP-A1N-NNN-NNN-NNN ERR100BLS1520NNN3S4BPA1NNNNNNNNNNNN ER-R-100B-LS-16-20-NN-N-3-K5AP-A1N-AAA-NNN-NNN ERR100BLS1620NNN3K5APA1NAAANNNNNN ER-R-100B-LS-16-20-NN-N-3-S1AP-A1N-NNN-NNN-NNN ERR100BLS1620NNN3S1APA1NNNNNNNNNNNN ER-R-100B-LS-16-20-NN-N-3-S1BP-A1N-AAA-NNN-NNN ERR100BLS1620NNN3S1BPA1NAAANNNNNN ER-R-100B-LS-16-20-NN-N-3-S1CP-A1N-NNN-NNN-NNN ERR100BLS1620NNN3S1CPA1NNNNNNNNNNNN ER-R-100B-LS-17-14-NN-N-3-S1BP-A1N-NNN-NNN-NNN ERR100BLS1714NNN3S1BPA1NNNNNNNNNNNN ER-R-100B-LS-17-20-NN-N-3-K5CP-A1N-NNN-NNN-NNN ERR100BLS1720NNN3K5CPA1NNNNNNNNNNNN ER-R-100B-LS-17-20-NN-N-3-S1CP-A1N-NNN-NNN-NNN ERR100BLS1720NNN3S1CPA1NNNNNNNNNNNN ER-R-100B-LS-17-20-NN-N-3-S1NL-A1N-NNN-NNN-NNN ERR100BLS1720NNN3S1NLA1NNNNNNNNNNNN ER-R-100B-LS-17-20-NN-N-3-S1RP-A1N-NNN-NNN-NNN ERR100BLS1720NNN3S1RPA1NNNNNNNNNNNN ER-R-100B-LS-17-24-NN-N-3-K5NP-A1N-NNN-NNN-NNN ERR100BLS1724NNN3K5NPA1NNNNNNNNNNNN 8. Check the oil supply line: Make sure that the oil supply line of the plunger pump is connected correctly and not blocked. Check for kinks, bends, or restrictions that could prevent hydraulic fluid flow to the pump. Straighten any kinks or remove any restrictions for uninterrupted fluid flow. 9. Check the rotation of the pump: Confirm that the direction of rotation of the plunger pump is correct. The pump should rotate in the direction indicated by the manufacturer's specifications. If the rotation is incorrect, the pump may not be able to draw liquid properly, resulting in an empty suction port. Reverse the direction of rotation of the pump if necessary. 10. Verify pump priming mechanism: Some plunger pumps may have a priming mechanism or priming valve that needs to be engaged to establish initial suction and fill the pump with fluid. Consult your pump's manual or manufacturer's guide to check for any specific priming requirements. Follow the instructions to prime the pump and make sure the fluid is drawn in properly. 11. Check for cavitation: Cavitation can occur when hydraulic fluid undergoes rapid pressure changes, leading to the formation and collapse of air bubbles. Cavitation can cause poor suction and lead to empty suction ports. Check the system for any signs of cavitation, such as unusual noise, vibration, or damage to pump components. Address the root cause of cavitation, such as high system back pressure or restricted fluid flow, to prevent further problems. ER-R-100B-LS-17-34-NN-N-3-S1NP-A1N-NNN-NNN-NNN ERR100BLS1734NNN3S1NPA1NNNNNNNNNNNN ER-R-100B-LS-18-20-NN-F-3-K5AP-A1N-AAA-NNN-NNN ERR100BLS1820NNF3K5APA1NAAANNNNNN ER-R-100B-LS-18-20-NN-N-3-K5NP-A1N-AAA-NNN-NNN ERR100BLS1820NNN3K5NPA1NAAANNNNNN ER-R-100B-LS-18-20-NN-N-3-S1CP-A1N-AAA-NNN-NNN ERR100BLS1820NNN3S1CPA1NAAANNNNNN ER-R-100B-LS-18-20-NN-N-3-S1N1-A1N-NNN-NNN-NNN ERR100BLS1820NNN3S1N1A1NNNNNNNNNN ER-R-100B-LS-18-20-NN-N-3-S1NL-A1N-NNN-NNN-NNN ERR100BLS1820NNN3S1NLA1NNNNNNNNNNNN ER-R-100B-LS-18-20-NN-N-3-S1NP-A1N-NNN-NNN-NNN ERR100BLS1820NNN3S1NPA1NNNNNNNNNN ER-R-100B-LS-18-24-NN-N-3-K5AP-A1N-AAA-NNN-NNN ERR100BLS1824NNN3K5APA1NAAANNNNNN ER-R-100B-LS-19-17-NN-N-3-S1CP-A1N-AAA-NNN-NNN ERR100BLS1917NNN3S1CPA1NAAANNNNNN ER-R-100B-LS-19-17-NN-N-3-S1NP-A1N-AAA-NNN-NNN ERR100BLS1917NNN3S1NPA1NAAANNNNNN ER-R-100B-LS-19-20-NN-N-3-K5BP-A1N-NNN-NNN-NNN ERR100BLS1920NNN3K5BPA1NNNNNNNNNNNN ER-R-100B-LS-19-20-NN-N-3-S1AP-A1N-NNN-NNN-NNN ERR100BLS1920NNN3S1APA1NNNNNNNNNNNN ER-R-100B-LS-19-20-NN-N-3-S1NL-A1N-NNN-NNN-NNN ERR100BLS1920NNN3S1NLA1NNNNNNNNNNNN ER-R-100B-LS-19-20-NN-N-3-S1NP-A1N-AAA-NNN-NNN ERR100BLS1920NNN3S1NPA1NAAANNNNNN ER-R-100B-LS-19-20-NN-N-3-S1NP-A1N-NNN-NNN-NNN ERR100BLS1920NNN3S1NPA1NNNNNNNNNNNN ER-R-100B-LS-19-20-NN-N-3-S4CP-A1N-NNN-NNN-NNN ERR100BLS1920NNN3S4CPA1NNNNNNNNNNNN ER-R-100B-LS-20-10-NN-N-3-S1CP-A1N-NNN-NNN-NNN ERR100BLS2010NNN3S1CPA1NNNNNNNNNNNN ER-R-100B-LS-20-12-NN-N-3-S1AP-A1N-NNN-NNN-NNN ERR100BLS2012NNN3S1APA1NNNNNNNNNNNN ER-R-100B-LS-20-14-NN-N-3-S2BP-A1N-AAA-NNN-NNN ERR100BLS2014NNN3S2BPA1NAAANNNNNN ER-R-100B-LS-20-15-NN-N-3-K5NP-A1N-NNN-NNN-NNN ERR100BLS2015NNN3K5NPA1NNNNNNNNNNNN ER-R-100B-LS-20-17-NN-N-3-K5NP-A1N-NNN-NNN-NNN ERR100BLS2017NNN3K5NPA1NNNNNNNNNNNN 12. Verify pump speed: Make sure the displacement pump is running at the correct speed. Running the pump at speeds outside the manufacturer's recommended range may affect its ability to effectively draw fluid. Adjust pump speed as needed to optimize fluid intake. 13. Consult the pump manufacturer: If the oil suction port is still empty after completing the above steps, it is recommended to consult the pump manufacturer or seek help from hydraulic system professionals. They can provide further guidance and troubleshooting for your displacement pump model and resolve any complications that may be causing an empty suction port. Prompt action, regular maintenance, and adherence to manufacturer guidelines are critical to maintaining proper operation of your displacement pump and preventing problems such as empty suction ports.