When maintaining a hydraulic pump, there will be an oil return phenomenon, and the oil will leak out of the pump during operation. This can be caused by a variety of factors, including: Worn or damaged internal components: Over time, the internal components of a hydraulic pump can become worn or damaged, causing oil to leak. For example, worn bearings, damaged seals or gaskets, or a worn pump rotor can all cause oil to leak from the pump. Improper installation or assembly: If the hydraulic pump is installed or assembled incorrectly, it can also cause oil leakage. For example, oil may leak from the pump if the pump casing or cover are not tightened properly, or if the gaskets are installed incorrectly. Contamination: If the hydraulic system becomes contaminated with dirt, debris, or other particles, it can cause wear and damage to the pump components, resulting in oil leakage. For the phenomenon of oil return, the following measures can be taken: Identify the source of the leak: This can be done by inspecting the hydraulic pump for signs of wear or damage, checking that the pump casing and gaskets are properly installed, and checking the hydraulic system for contamination. Repair or replace damaged parts: If the internal parts of the pump are worn or damaged, they should be repaired or replaced as needed. Reassemble the pump properly: Make sure the pump casing and cover are properly tightened and gaskets and seals are installed properly. Clean and Flush the Hydraulic System: If the system becomes contaminated, it should be cleaned and flushed to remove any dirt or debris that may cause wear and damage to the pump components. Test the system: After repairs, the hydraulic system should be tested to make sure it is functioning properly and that there are no more oil leaks. 90-L-075-KP-1-CD-80-S-3-S1-D-03-GBA-23-23-24 90L075KP1CD80S3S1D03GBA232324 90-L-075-KP-1-CD-80-S-3-S1-D-03-GBA-32-32-24 90L075KP1CD80S3S1D03GBA323224 90-L-075-KP-1-CD-80-S-3-S1-D-03-GBA-42-42-26 90L075KP1CD80S3S1D03GBA424226 90-L-075-KP-1-CD-80-S-3-S1-E-03-GBA-42-42-24 90L075KP1CD80S3S1E03GBA424224 90-L-075-KP-1-CD-80-S-3-T2-D-03-GBA-35-35-24 90L075KP1CD80S3T2D03GBA353524 90-L-075-KP-1-CD-80-S-4-C7-D-00-GBA-29-29-20 90L075KP1CD80S4C7D00GBA292920 90-L-075-KP-1-CD-80-S-4-S1-D-02-GBA-35-35-24 90L075KP1CD80S4S1D02GBA353524 90-L-075-KP-1-CD-80-S-4-S1-D-03-GBA-35-35-24 90L075KP1CD80S4S1D03GBA353524 90-L-075-KP-1-CD-80-S-4-S1-D-03-GBA-42-42-24 90L075KP1CD80S4S1D03GBA424224 90-L-075-KP-1-CD-81-P-3-S1-D-03-GBA-35-35-20 90L075KP1CD81P3S1D03GBA353520 By timely and thoroughly solving the oil return phenomenon, the performance and reliability of the hydraulic pump can be maintained, and the safety and efficiency of the hydraulic system can be guaranteed. Regular maintenance and inspection of hydraulic systems can also help prevent oil leaks and other problems from occurring. In addition to the previously mentioned steps, there are a few other factors to consider when repairing a hydraulic pump to prevent oil backlash: Use High-Quality Replacement Parts: Using high-quality replacement parts helps ensure the longevity and reliability of your hydraulic pump. Inferior or poorly manufactured replacement parts can wear out or fail quickly, resulting in oil leaks. Check hydraulic oil: Hydraulic oil plays a vital role in the operation of hydraulic systems, and it can also affect pump performance and reliability. Fluid levels and viscosities should be checked periodically and fluids replaced according to the manufacturer's recommendations. Use the correct tools and equipment: When servicing hydraulic pumps, it is important to use the correct tools and equipment to avoid damage to pump components. Using the wrong tools or equipment can result in improper installation or assembly, which can lead to oil spills. Follow Manufacturer's Guidelines: Manufacturer's guidelines for repairing and maintaining hydraulic pumps should be strictly followed to ensure that the pump is functioning properly and that there are no oil leaks or other problems. In summary, oil return is a common problem in hydraulic pump repair, but it can be resolved by pinpointing the source of the leak, repairing or replacing damaged components, properly reassembling the pump, cleaning and flushing the hydraulic system, and testing the system. Using high-quality replacement parts, checking the hydraulic fluid, using the correct tools and equipment, and following the manufacturer's guidelines can also help prevent oil leaks and other problems with your hydraulic pump. Regular maintenance and inspections of hydraulic systems are also important to identify and resolve potential problems before they become major problems. It is also important to note that there are different types of oil return in hydraulic pumps and the steps to deal with them may vary depending on the type of oil return. 90-L-075-KP-1-NN-60-D-3-S1-L-00-GBA-45-45-24 90L075KP1NN60D3S1L00GBA454524 90-L-075-KP-1-NN-60-D-3-S1-L-03-EBC-42-42-20 90L075KP1NN60D3S1L03EBC424220 90-L-075-KP-1-NN-60-L-3-S1-D-03-GBA-29-29-24 90L075KP1NN60L3S1D03GBA292924 90-L-075-KP-1-NN-60-L-4-S1-D-03-GBA-35-35-20 90L075KP1NN60L4S1D03GBA353520 90-L-075-KP-1-NN-60-L-4-S1-E-02-GBA-35-14-24 90L075KP1NN60L4S1E02GBA351424 90-L-075-KP-1-NN-60-L-4-S1-E-03-GBA-35-35-24 90L075KP1NN60L4S1E03GBA353524 90-L-075-KP-1-NN-60-P-3-S1-D-00-GBA-42-42-24 90L075KP1NN60P3S1D00GBA424224 90-L-075-KP-1-NN-60-P-3-S1-D-03-GBA-17-17-24 90L075KP1NN60P3S1D03GBA171724 90-L-075-KP-1-NN-60-P-3-S1-D-03-GBA-42-42-24 90L075KP1NN60P3S1D03GBA424224 90-L-075-KP-1-NN-60-P-3-S1-E-03-GBA-35-35-24 90L075KP1NN60P3S1E03GBA353524 One type of oil return is called "partial oil return," where oil returns to the tank but not completely, causing oil to build up in the system. This can be caused by worn or damaged internal components, low oil viscosity, or worn pump casing or cover. To fix this, the pump should be disassembled and inspected for worn or damaged parts, and if worn, the pump casing and cover should be replaced. The hydraulic fluid should also be checked for proper viscosity and the system flushed to remove any contamination. Another type of oil return is known as "full oil return," where oil returns to the tank but at a rate lower than the pumping rate, causing the pump to lose priming. This can be caused by a worn or damaged pump shaft or worn pump seals. To fix this, the pump should be disassembled and inspected for worn or damaged parts, and the pump shaft and seals should be replaced if worn. The hydraulic fluid should also be checked for proper viscosity and the system flushed to remove any contamination. In some cases, the phenomenon of oil return may be caused by external factors, such as excessive system pressure or excessive hydraulic system load. These should also be addressed to prevent oil leaks and other problems with hydraulic pumps. In summary, oil return from a hydraulic pump can be caused by a variety of factors, including worn or damaged internal components, improper installation or assembly, contamination, low oil viscosity, or external factors. To fix the problem, identify the source of the leak, repair or replace damaged components, reassemble the pump properly, clean and flush the hydraulic system, and test the system. Following manufacturer guidelines, using high-quality replacement parts, checking hydraulic fluid, using the correct tools and equipment, and regular maintenance and inspections can also help prevent oil backlash and maintain hydraulic pump performance and reliability.