1. Repair of the drive shaft and bushing wear in a diesel gear oil pump
The drive shaft and bushing are subject to significant wear due to the weight of the driving gear and the radial thrust created during meshing with the driven gear. This can cause misalignment, increasing the clearance between the shaft and the bushing hole. As a result, oil leakage occurs during operation, which reduces the oil delivery capacity of the pump.
When the shaft or bushing shows minor wear, one effective repair method is to replace the old sleeve with a new one, which can restore the proper clearance without requiring major modifications. However, if both the shaft and bushing are severely worn and the gap has significantly increased, more extensive repairs are necessary. In such cases, the bushing should be replaced, and the shaft may be chrome-plated or repaired using welding techniques to increase its diameter. Afterward, the shaft is ground back to the original specifications to ensure proper fit and performance.
2. Repair of wear on the pump housing cavity and gears
Wear on the pump housing cavity and the gears can greatly affect the oil pump’s output. When the shaft and bushing or the shaft hole are excessively worn, the top of the gear teeth may come into contact with the inner surface of the pump housing. Due to the pressure difference between the high-pressure and low-pressure chambers, the gear teeth tend to press against the inlet side of the housing, causing greater wear in that area. This increases the clearance at the top of the teeth, reducing the pressure differential and weakening the pumping action. As a result, oil pressure and flow rate decrease.
To repair this type of wear, the most common method is to line the worn areas of the pump housing with a new insert. Additionally, gear tooth wear often occurs unevenly along the thickness of the teeth, leading to an increased meshing gap. To extend the life of the gears, they can be rotated 180 degrees and reused if the wear is not too severe.
3. Repair of the gear end face and pump cover after wear
There is a small clearance between the gear end face and the pump cover, known as the end face clearance. Over time, wear on the contact surfaces between the gear end faces and the pump cover can increase this clearance. If the clearance exceeds the allowable limit, it will significantly impact the oil pump’s performance by allowing excessive leakage.
To address this issue, the gear end faces can be polished and then resurfaced to maintain the correct clearance. The pump cover itself may also need to be machined or ground to ensure the end face clearance remains within the required range. Regular inspection and maintenance of these components are essential for maintaining optimal pump efficiency and preventing further damage.
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