Reasons for oil leakage in Rexroth gear pumps and their repair methods

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Oil leakage from Rexroth gear pumps is a fairly common phenomenon throughout the hydraulic industry. Generally speaking, there are two main causes: first, oil leakage inside the gear pump itself, and second, oil leakage from the pump cover or the pump body of the Rexroth gear pump. So, what are the reasons for oil leakage in Rexroth gear pumps and what are the corresponding repair methods? Autos will analyze them for everyone one by one. Internal oil leakage in Rexroth gear pumps: Due to the constant exposure to high pressure inside Rexroth gear pumps, the bolts that connect the left and right pump covers to the pump body are stretched under tension, resulting in loosening and oil leakage ； Since hydraulic pumps are susceptible to various influences when transferring oil-based substances, leaks in Rexroth gear pumps occur from time to time. Below, we will conduct a detailed analysis of the causes of these leaks. The impact of cleanliness in the pipeline system of Rexroth gear pumps. Since hydraulic pumps convey oils that contain certain hard impurities, and there is also some sticky sediment inside the pipes as well as within the Rexroth gear pump itself, these hard particles can break loose under pressure. During the high-speed operation of the Rexroth gear pump, these particles not only increase friction within the pump but also gain energy, turning into particles with high kinetic energy that strike the gear pump. Under such intense impacts, the seal rings of the Rexroth gear pump can easily be damaged over time, leading to oil leakage. There are issues with the quality of the components used in Rexroth gear pumps. The components of Rexroth gear pumps are complex. Due to the operating principle of these pumps as well as the need for easy maintenance and management, it is inevitable that their pump casings cannot be integrated into a single unit. Therefore, the sealing performance plays a decisive role in the overall performance of Rexroth gear pumps. Radial cracks, scratches, or damaged oil seals on the pump cover or pump body can also cause oil leakage: the installation between the Rexroth gear pump and the main machine is not proper. The Rexroth gear pump is connected to the main engine via a drive shaft, whereby the main engine supplies power to the Rexroth gear pump. During installation, it is required that the coaxial error between the Rexroth gear pump and the main engine be less than 0.05 mm. If the runout of the spline shaft end of the transmission and the rotation center of the spline shaft exceeds the specified limits, it is very likely that the seal at the shaft of the Rexroth gear pump will be subjected to strong radial forces during high-speed operation, resulting in poor sealing and oil leakage. The asbestos gasket between the flange of the Rexroth gear pump front cover and the assembly face of the transmission is too thick. Due to the easy deformation of asbestos gaskets, during installation, uneven clamping force from the fixing bolts between the front end of the Rexroth gear pump and the transmission can cause a misalignment between the pump and the transmission. Over time, excessive wear of the equipment can lead to oil leakage. The reasons for oil leakage in Rexroth gear pumps and the methods for repair are, in summary, to pay close attention to the operation of the gear pump on a regular basis, carry out daily maintenance, and report any instances of oil leakage promptly for handling. Do not think that since the oil leakage is not severe you can just keep using the equipment; such an attitude could lead to the complete destruction of your entire hydraulic pump!