When the electromagnet of the electromagnetic reversing valve of the hydraulic pump does not act, it can indicate that the circuit or the electromagnet itself is faulty. Here are some possible causes and troubleshooting steps to resolve this issue: 1. Power supply: Check whether the power supply of the electromagnetic reversing valve is normal. Make sure the power supply is providing the proper voltage and there are no loose or broken electrical connections. 2. Wiring and wiring: Check the wiring and wiring of the electromagnetic reversing valve. Look for any loose or damaged wires, faulty connectors, or disconnected connections. Make sure the wiring is properly connected and fastened securely. 3. Fuse or circuit breaker: Check whether the fuse or circuit breaker connected to the electromagnetic reversing valve is tripped or blown. If so, replace the fuse or reset the circuit breaker as necessary. 4. Control signal: Confirm whether the control signal sent to the electromagnetic reversing valve arrives correctly. Check the control circuit for continuity and voltage using a multimeter or other appropriate test equipment. 5. Electromagnet coil: Use a multimeter to test the continuity of the electromagnet coil. If it does not conduct, the coil may be damaged or burned out. In this case, the solenoid may need to be replaced. 90L130-KA-5-CD-80-D-4-F1-L-05-GBA-35-35-24 90L130KA5CD80D4F1L05GBA353524 90-L-130-KA-5-CD-80-D-4-F1-L-05-GBA-35-35-24 90L130KA5CD80D4F1L05GBA353524 90L130-KA-5-CD-80-L-3-C8-H-03-GBA-42-42-28 90L130KA5CD80L3C8H03GBA424228 90-L-130-KA-5-CD-80-L-3-C8-H-03-GBA-42-42-28 90L130KA5CD80L3C8H03GBA424228 90L130-KA-5-CD-80-L-3-F1-H-03-GBA-42-42-28 90L130KA5CD80L3F1H03GBA424228 90-L-130-KA-5-CD-80-L-3-F1-H-03-GBA-42-42-28 90L130KA5CD80L3F1H03GBA424228 90L130-KA-5-CD-80-L-4-C8-F-05-GBA-26-26-24 90L130KA5CD80L4C8F05GBA262624 90-L-130-KA-5-CD-80-L-4-C8-F-05-GBA-26-26-24 90L130KA5CD80L4C8F05GBA262624 90L130-KA-5-CD-80-L-4-F1-F-03-GBA-35-35-24 90L130KA5CD80L4F1F03GBA353524 90-L-130-KA-5-CD-80-L-4-F1-F-03-GBA-35-35-24 90L130KA5CD80L4F1F03GBA353524 6. Mechanical blockage: Make sure that there is no mechanical blockage or obstacles that hinder the movement of the electromagnetic reversing valve. Sometimes, debris, dirt, or excessive friction can prevent valve operation. 7. Control system or controller: If the above steps do not solve the problem, it may be necessary to check the control system or controller responsible for sending the signal to the solenoid valve. Check for any faults or malfunctions in control system components or programs. 8. Consult an expert: If the troubleshooting steps cannot determine the cause of the failure or the problem persists, it is recommended to consult a hydraulic system expert, technician or manufacturer for further assistance. They can provide specific instructions and troubleshooting steps based on the specific hydraulic system and problematic solenoid valve. 9. Coil resistance: Use a multimeter to measure the resistance of the electromagnet coil. Compare the measured resistance to the manufacturer's specifications. If the resistance is significantly different or shows an open circuit, the coil is faulty and may need to be replaced. 10. Coil Voltage: Verify proper voltage is reaching the solenoid coil. With the system powered up, use a multimeter to measure the voltage across the coil terminals. If no voltage is present, check power, wiring and connections to the coil. 11. Contamination or Corrosion: Check the electromagnet and its surrounding area for any signs of contamination or corrosion. Dirt, debris or moisture can interfere with the operation of the electromagnet. Clean the area and make sure nothing is obstructing the electromagnet. 12. Mechanical stuck: Check the moving parts of the electromagnetic reversing valve, including whether the plunger or spool is stuck or cannot move freely. Deposits, wear or insufficient lubrication can cause mechanical sticking. Clean and lubricate valve components according to manufacturer's recommendations. 13. Overheating: Overheating will cause the electromagnet to malfunction. Check whether the temperature around the electromagnetic reversing valve is within the specified operating range. Improve cooling or thermal management in the system if necessary. 90L130-KA-5-CD-80-P-3-C8-F-03-GBA-42-42-28 90L130KA5CD80P3C8F03GBA424228 90-L-130-KA-5-CD-80-P-3-C8-F-03-GBA-42-42-28 90L130KA5CD80P3C8F03GBA424228 90L130-KA-5-CD-80-P-3-F1-F-04-GBA-35-35-20-G005 90L130KA5CD80P3F1F04GBA353520G005 90-L-130-KA-5-CD-80-P-3-F1-F-04-GBA-35-35-20-G005 90L130KA5CD80P3F1F04GBA353520G005 90L130-KA-5-CD-80-P-3-F1-H-02-GBA-30-30-24 90L130KA5CD80P3F1H02GBA303024 90-L-130-KA-5-CD-80-P-3-F1-H-02-GBA-30-30-24 90L130KA5CD80P3F1H02GBA303024 90L130-KA-5-CD-80-P-3-F1-H-04-GBA-35-35-20 90L130KA5CD80P3F1H04GBA353520 90-L-130-KA-5-CD-80-P-3-F1-H-04-GBA-35-35-20 90L130KA5CD80P3F1H04GBA353520 90L130-KA-5-CD-80-R-3-C8-F-03-GBA-30-30-24 90L130KA5CD80R3C8F03GBA303024 90-L-130-KA-5-CD-80-R-3-C8-F-03-GBA-30-30-24 90L130KA5CD80R3C8F03GBA303024 14. Electromagnetic drive circuit: If the electromagnet is controlled by a separate electromagnetic drive circuit, check whether the drive circuit is faulty. Check voltage, wiring connections, and any fault codes or error indications on the drive or control unit for correctness. 15. Damaged electromagnet: In rare cases, the electromagnet itself may suffer physical damage, such as a broken or deformed core. Visual inspection helps to identify any visible signs of damage. If damage is detected, the solenoid may need to be replaced. 16. Consult the manufacturer or experts: If the fault still exists or is not easy to identify, it is recommended to consult the manufacturer's technical support or seek help from hydraulic system experts. They can provide specific troubleshooting steps or recommend further action based on their expertise and knowledge of specific hydraulic pumps and solenoid directional valves. Remember to always follow proper safety procedures and consult the equipment documentation or guides provided by the manufacturer during troubleshooting and maintenance activities.