1. Repair of wear on the end face and pump cover of the gear oil pump
There is a certain gap between the gear end face and the inner plane of the pump cover, called the end face clearance. During operation, wear on the contact surface between the gear end face and the inner plane of the pump cover will increase this end face clearance. When it exceeds the limit, it will have a significant impact on the pump oil volume.
When the gear end face is worn, the end face can be ground flat, and the disassembly surface of the oil pump housing can be ground at the same time to ensure that the end face clearance of the pump is within the required range.
2. Repair of worn drive shaft and bushing of diesel engine gear oil pump
Due to the weight of the driving gear itself and the radial thrust generated when the driven gear meshes, the shaft and bushing bore are prone to uneven wear, increasing the clearance. Therefore, during operation, the gear pump will leak oil due to the increased clearance, resulting in a reduced oil supply.
After the drive shaft and bushing wear, the fit clearance can be restored by repairing the journal or the bushing. When the journal wear is minor, simply press out the old bushing and replace it with a new one; the shaft generally does not need repair, thus restoring the fit clearance to within the allowable range. When both the shaft and bushing are severely worn, and the fit clearance has increased significantly, not only must the bushing be replaced, but the shaft should also be enlarged in diameter using chrome plating or vibration welding, and then ground to the standard dimensions to restore the required fit between the journal and bushing.
3. Repair of wear on the pump casing inner cavity and gear teeth
Wear between the pump housing cavity and the gear teeth significantly impacts the pump's oil output. In gear pumps, when the shaft, bushing, or shaft bore is severely worn, undue contact occurs between the gear tips and the pump housing cavity surface during operation. Furthermore, because the outlet chamber has a higher pressure than the inlet chamber, this pressure difference leads to more contact between the gear tips and the area near the inlet chamber of the pump housing, resulting in greater wear in this area and an increased clearance between the cavity and the gear tips. This reduces the pressure difference between the oil pump's inlet and outlet chambers, decreasing the scraping and pressing action of the gear teeth, leading to a drop in oil supply pressure and a decrease in pump output. Wear on the pump housing cavity is generally repaired using an internal sleeve method.
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