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Diesel engine gear oil pump repair points after wear
Diesel gear oil pumps are prone to wear on the drive shaft and bushing due to radial thrust generated by the meshing of the gear and the passive gear. This can lead to eccentric wear between the shaft and the bushing bore, increasing the clearance and causing oil leakage during operation, which in turn reduces the oil delivery capacity. To address this issue, the journal or bushing can be repaired. In cases of minor wear on the journal, a new sleeve can be pressed over the old one, restoring the clearance within acceptable limits without requiring shaft repair. However, if the wear is severe and the clearance has significantly increased, both the bushing and the shaft may need replacement. The shaft can then be chrome-plated or welded with vibration welding to increase its diameter, followed by grinding to restore it to the standard size, ensuring proper fit with the bushing.
Wear on the pump housing cavity and gears also greatly affects the oil delivery volume. When the shaft or bushing wears seriously, the gear teeth may come into contact with the pump chamber walls, especially under high pressure. This leads to more pronounced wear in the area where the gear tooth tops meet the inlet side of the pump housing, increasing the top clearance. As a result, the pressure difference between the inlet and outlet chambers decreases, reducing the effectiveness of oil scraping and pressure buildup, which ultimately lowers the oil supply pressure and pump performance. To repair the worn pump housing cavity, the lining method is commonly used. Additionally, gear tooth wear in the direction of tooth thickness increases the meshing gap between the driving and driven gears. This wear is typically uneven, so the gears can be rotated 180 degrees for continued use.
The end face of the gear and the pump cover also experience wear, creating an end clearance that is essential for proper operation. If the wear increases beyond acceptable limits, it can cause significant oil leakage and reduced efficiency. When the gear end faces are worn, they can be polished and then ground to ensure the end clearance remains within the required range. This helps maintain the pump's performance and prolongs its service life. Regular maintenance and timely repairs are crucial to preventing excessive wear and ensuring the reliable operation of the diesel gear oil pump.