If you are unable to adjust your hydraulic pump's relief valve to achieve the desired maximum pressure, there are several potential causes: 1. Mechanical Restriction: A safety valve may have a mechanical restriction that prevents it from being adjusted to the desired pressure. Some safety valves have a fixed maximum pressure setting that cannot be exceeded. In this case, you may need to replace the relief valve with one with a higher pressure rating. 2. Blockage or restricted flow: If there is a restriction or blockage in the hydraulic system, it can prevent the relief valve from reaching the required pressure. Check for any obstructions or restrictions in fluid lines, filters, or other components that may impede fluid flow. Clearing any blockage or restriction should allow the relief valve to reach the required pressure. 3. The size of the safety valve is incorrect: the size of the safety valve may not meet the requirements of the hydraulic system. If the maximum pressure required by the system is higher than the design pressure of the safety valve, it will not be able to achieve the required pressure. In this case, you'll need to replace the relief valve with one sized for your system's pressure requirements. 4. Damaged or worn safety valve: A damaged or worn safety valve may not function properly and thus fail to achieve the desired pressure. Check the relief valve for any signs of damage such as leaks, corrosion or wear. If the relief valve is damaged, it will need to be replaced. 90-L-130-KA-5-NN-80-L-4-F1-H-03-GBA-14-35-24 90L130KA5NN80L4F1H03GBA143524 90L130-KA-5-NN-80-L-4-F1-H-03-GBA-26-26-24 90L130KA5NN80L4F1H03GBA262624 90-L-130-KA-5-NN-80-L-4-F1-H-03-GBA-26-26-24 90L130KA5NN80L4F1H03GBA262624 90L130-KA-5-NN-80-L-4-F1-H-03-GBA-29-29-24 90L130KA5NN80L4F1H03GBA292924 90-L-130-KA-5-NN-80-L-4-F1-H-03-GBA-29-29-24 90L130KA5NN80L4F1H03GBA292924 90L130-KA-5-NN-80-L-4-F1-H-03-GBA-42-42-24 90L130KA5NN80L4F1H03GBA424224 90-L-130-KA-5-NN-80-L-4-F1-H-03-GBA-42-42-24 90L130KA5NN80L4F1H03GBA424224 90L130-KA-5-NN-80-P-3-C8-F-03-GBA-35-35-24 90L130KA5NN80P3C8F03GBA353524 90-L-130-KA-5-NN-80-P-3-C8-F-03-GBA-35-35-24 90L130KA5NN80P3C8F03GBA353524 90L130-KA-5-NN-80-P-3-C8-F-04-GBA-32-32-22 90L130KA5NN80P3C8F04GBA323222 5. Incorrect adjustment procedure: Make sure you adjust the safety valve according to the correct procedure. Refer to the manufacturer's instructions or technical documentation for the specific pump and relief valve you are using. If you are unsure about the adjustment procedure, you may want to consult a professional or contact the manufacturer for guidance. 6. Incorrect type of relief valve: Make sure you are using the correct type of relief valve for your hydraulic system. There are different types of safety valves available such as direct acting safety valves and pilot operated safety valves. Make sure the relief valve you use is suitable for your specific application and compatible with the hydraulic pump. 7. Upstream pressure control: Check for any pressure control devices or components upstream of the safety valve that could affect its regulation. Pressure reducing valves, flow control valves, or other devices in the system may limit the pressure available to the relief valve. Adjust or check the settings of these upstream devices to ensure they are not causing any pressure restrictions. 8. Contamination or wear: Contamination in the hydraulic oil or wear of the safety valve components can affect its normal operation and adjustment. Check the hydraulic fluid for any contamination and make sure it is clean and within recommended specifications. If a relief valve component, such as a spring or poppet, is worn or damaged, it may need to be replaced. 9. Improper installation or setting: Carefully check the installation of the safety valve to ensure it is properly installed in the hydraulic system. Make sure the valve is properly connected, aligned and sealed. Verify that the pressure sensing port of the relief valve is receiving the correct hydraulic signal for proper adjustment. 10. Manufacturer support: If you have exhausted all troubleshooting steps and still cannot adjust the safety valve to the desired maximum pressure, it is recommended to contact the manufacturer or seek help from a hydraulic system expert. They can provide specific guidance based on hydraulic pump model, relief valve type and your system's unique requirements. 11. System load: System load will affect the maximum pressure achievable. If the system is under heavy load or encounters high resistance, the relief valve may have difficulty achieving the required pressure. Check if the load or resistance can be reduced, for example by adjusting the actuator or load conditions, to facilitate achieving the desired pressure. 12. Gauge Accuracy: Make sure the gauges you use to monitor system pressure are accurate and calibrated. Inaccurate or faulty pressure gauges can give misleading readings, making it difficult to adjust relief valves. Verify gauge accuracy or use a different gauge to confirm actual system pressure. 90-L-130-KA-5-NN-80-P-3-C8-F-04-GBA-32-32-22 90L130KA5NN80P3C8F04GBA323222 90L130-KA-5-NN-80-P-3-C8-H-03-GBA-42-42-24 90L130KA5NN80P3C8H03GBA424224 90-L-130-KA-5-NN-80-P-3-C8-H-03-GBA-42-42-24 90L130KA5NN80P3C8H03GBA424224 90L130-KA-5-NN-80-P-4-C8-F-03-GBA-42-42-24 90L130KA5NN80P4C8F03GBA424224 90-L-130-KA-5-NN-80-P-4-C8-F-03-GBA-42-42-24 90L130KA5NN80P4C8F03GBA424224 90L130-KA-5-NN-80-P-4-C8-H-03-GBA-42-42-24 90L130KA5NN80P4C8H03GBA424224 90-L-130-KA-5-NN-80-P-4-C8-H-03-GBA-42-42-24 90L130KA5NN80P4C8H03GBA424224 90L130-KA-5-NN-80-P-4-F1-F-03-GBA-35-35-24 90L130KA5NN80P4F1F03GBA353524 90-L-130-KA-5-NN-80-P-4-F1-F-03-GBA-35-35-24 90L130KA5NN80P4F1F03GBA353524 90L130-KA-5-NN-80-R-3-C8-H-03-GBA-30-30-24 90L130KA5NN80R3C8H03GBA303024 13. Hydraulic pump condition: Assess the condition of the hydraulic pump itself. A worn or damaged pump can have difficulty generating and maintaining high pressure. Check the pump for any wear, leaks, or other issues that could affect its performance. Consider repairing or replacing the pump, if necessary, to ensure proper pressure is being produced. 14. System Design Limitations: The maximum pressure achievable by a hydraulic system may be limited by the design or specification of other system components. Check system designs, including pipe diameter, fluid viscosity and other relevant factors, to ensure they are suitable to achieve the required pressure. System design modifications may be required to achieve higher pressures. 15. Expert consultation: If it still doesn’t work, please consult the hydraulic system expert or the manufacturer’s representative. They can provide specific guidance based on their expertise and knowledge of hydraulic pumps and systems. They may be able to identify any specific limitations or offer alternative solutions to achieve the desired stress. Remember that hydraulic systems can be complex, and solving pressure-related problems requires careful analysis and consideration of multiple factors. If you are unsure or unfamiliar with hydraulic systems, it is recommended to seek professional help to ensure safe and efficient operation.