Gear pump repair points after wear
1. Repair of Wear on the Drive Shaft and Bushing in a Diesel Gear Oil Pump The drive shaft and bushing in a diesel gear oil pump are subject to significant wear due to the weight of the driving gear and the radial thrust created when the driven gear meshes with it. This can lead to eccentricity, increasing the clearance between the shaft and the bushing hole. As a result, oil leakage occurs during operation, reducing the oil delivery capacity of the pump. When there is minor wear on the shaft journal, the simplest solution is to replace the old sleeve with a new one, which can restore the clearance to an acceptable level without requiring any machining of the shaft itself. However, if both the shaft and bushing are severely worn, resulting in a large increase in clearance, it may be necessary to not only replace the bushing but also apply chrome plating or weld the shaft to increase its diameter. Afterward, the shaft is ground back to the original standard size to ensure proper fit and alignment with the bushing. 2. Repair of Wear on the Pump Housing Cavity and Gears Wear on the pump housing cavity and the gears has a major impact on the oil delivery performance of the pump. When the shaft or bushing becomes seriously worn, the gear teeth may no longer make full contact with the inner surface of the pump housing. Due to the higher pressure in the oil discharge chamber compared to the intake chamber, the tooth tops tend to make more contact with the inlet side of the housing, leading to localized wear in that area. This increases the top clearance and reduces the pressure difference between the inlet and outlet chambers, decreasing the effectiveness of oil scraping and pressure buildup. As a result, the oil supply pressure drops, and the overall performance of the pump is affected. To repair this type of wear, the most common method is to install a liner inside the pump housing cavity. Additionally, if the gears show wear along the tooth thickness, the meshing gap between the driving and driven gears increases. This wear is usually uneven, so the gear can often be rotated 180 degrees and reused, provided the wear is not too severe. 3. Repair of Wear on the Gear End Face and Pump Cover There is a small clearance between the end face of the gear and the pump cover, known as the end face clearance. Over time, wear on the contact surfaces between the gear end face and the pump cover can cause this clearance to increase. When the clearance exceeds the allowable limit, it significantly affects the pump's oil delivery performance. If the gear end face is worn, it can be polished and then the pump housing's mating surface can be ground to restore the required end face clearance. This ensures proper sealing and maintains the efficiency of the oil pump. Rice Cooker,Aroma Rice Cooker,Small Rice Cooker,Ceramic Rice Cooker Guangxi Nanning King Green Smart Co., Ltd. , https://www.smartliferobot.com