The oil leakage of the crane gear pump actually means that the hydraulic oil will break through the skeleton oil seal. The following is a detailed analysis of the cause of the oil leakage of the small crane gear pump oil seal and proposes a solution to the problem:
First, the impact of crane gear pump and host installation quality. The general working pump is mounted on the variable speed pump, and the variable speed pump is mounted on the transmission. If the end face of the gearbox or variable speed pump is out of tolerance to the center of rotation of the spline shaft, a cumulative error is formed, causing the gear pump to withstand radial forces at high speeds, causing the oil seal to leak oil. Therefore, the installation requirement of the gear pump and the main machine is less than 0.05.
Second, it is also related to the spline rolling button. The outer stop of the gear pump and the inner stop of the variable speed pump and the external spline of the gear pump and the spline shaft spline in the gearbox, whether the clearance between the two is reasonable, the leakage of the gear pump The oil has an effect. It is recommended to check the strength of the external spline of the gear pump shaft when using the gear pump to ensure sufficient effective contact length. This will prevent the crane from leaking oil.
3. The variable speed pump is mounted on the output shaft of the gearbox. If the end face of the variable speed pump is out of tolerance to the center of rotation of the gear, the center of rotation of the gear shaft and the center of the oil seal will not coincide and affect the seal. If there is such a problem in the material and processing quality of the sealing ring, cracks and scratches will occur in the sealing ring, and the oil seal will leak oil. If the quality of the oil seal is unqualified, the geometry of the oil seal is unqualified, the tightening spring is too loose, etc., causing the airtightness test to leak, and the gear pump is leaked after being loaded into the main engine. The oil seal should be replaced and the material and geometry checked.
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