fault | reason | Exclusion method |
The pump does not output liquid (medium) or output little liquid | Output pipeline resistance, impeller blockage, low speed, wrong steering. Suction line valve not open | Reduce tube resistance. Remove foreign matter from impeller. Increase the speed and adjust the steering. Open the valve |
The pump shaft is not concentric with the motor. The bearing is damaged. The oil pump bears the weight of the pipeline. There is air in the pipeline | Adjust the axis of pump and motor center and replace the bearing. Adjust the installation position of the pipeline. Remove the air from the pipeline | |
The impeller is blocked and the speed is not enough. The characteristic curve of the device is not consistent with that of the pump. The clearance of sealing ring is too large and there is leakage in the pipeline | Remove the foreign matter in the impeller and increase the speed. Adjust the characteristics of the device, replace the impeller, check the installation quality of the pipeline and correct it | |
Excessive power consumption of oil pump | The rotor part of the friction, pump axis and motor axis does not coincide. The flow of the pump is too high | Adjust the axis of the pump to coincide with the axis of the motor, and close the outlet valve to reduce the flow |
The rotor part of the oil pump is hot or does not rotate | Foreign matter mixed into the pump, stuck, poor lubrication conditions, resulting in shaft report | Remove the foreign matter in the pump and replace the bearing |
The bearing lacks oil lubrication or the selection of lubricating oil is unreasonableand the axis of pump and motor is not concentric | Add clean heat transfer oil to the bearing cavity, use grease reasonably, and adjust the center line of motor and pump |