Reason for hydraulic pump failure: internal leakage of oil pump, aging of sealing ring; Exclusion method: Replace the sealing ringFault cause: Wear or scratch on the end face of the oil pump or the shaft sleeve of the main and driven gears, and the unevenness of the two shaft sleeve end faces exceeds the tolerance. Troubleshooting method: Replace the worn gear oil pump or oil pump shaft sleeve, and if the wear is slight, grind the end face flat on the flat plate. The allowable error for its unevenness is 0.03mm; The end face of the upper shaft sleeve is lower than the pump body and the upper plane (normal value is lower than 2.5-2.6mm). If it exceeds the tolerance, a 0.1-0.2mm copper sheet should be added to the lower shaft sleeve to compensate. When installing, it should be fitted onto the rear shaft sleeve.Analysis of Common Hydraulic Pump Malfunctions in Daily LifeFault cause: Internal leakage caused by incorrect assembly of internal parts in the oil pump. Troubleshooting method: The unloading plate and sealing ring must be installed in the oil chamber to maintain balance between the two shaft sleeves. The elastic force of the guiding steel wire should be able to simultaneously twist the upper and lower shaft sleeves towards the direction of rotation of the driven gear by a small angle, so that the machining planes of the two shaft sleeves of the main and driven gears are tightly fitted; The unloading groove on the shaft sleeve must be installed on one side of the low-pressure chamber to eliminate harmful dead volume generated during gear meshing; Before pressing in the self tightening oil seal, a layer of lubricating oil should be applied to its surface, and attention should be paid to facing the oil blocking edge towards the front cover and not installing it backwards; Before installing the pump cover, a small amount of hydraulic oil should be poured into the pump casing and the meshing gear should be manually rotatedFault cause: Hydraulic oil is too dirty. Troubleshooting method: Clean the system and replace the hydraulic oil.Reason for malfunction: The filter of the pump is blocked by dirt and cannot filter oil. Solution: Use clean cleaning oil to remove dirt from the filter.Fault cause: Insufficient oil level, high suction position, exposed oil level on the suction pipe. Troubleshooting method: Add oil to the oil level mark and lower the suction position.