When the air pump starts, it seems that there is not enough strength, so the rhythm is very slow, and then it does not turn. It seems to be the owner of the card. That's the case. Thank you very much for the help of experienced people..
If it's a belt drive, it must be a loose belt.
Check that the drive shaft is in good condition.
If the motor and pump with no problem, and is directly connected through the shaft, when starting the motor current should be increased, a long time to burn the motor, so attention must be paid to the operation time of the motor in the test and inspection, and strict control of motor current.If the motor and the air pump are connected by belt, check that the belt is loose Adjust the tension of the belt.If the above problems are normal, it is necessary to disassemble the air pump, check the bearing of the lower air pump is good, especially the lubrication state of the bearing. General rotating machinery failure, most of which are caused by poor lubrication, if the bearings are worn, it is necessary to replace; if the lubrication is bad, it is necessary to clean bearings, re lubrication. But as you describe the pump running with a rattling noise, I think the bearings of the pump should be replaced, because there was no refueling and maintenance for a long time. Because the pump bearing wear, pump will appear large vibration in the operation set, then we should pay attention to whether there is a collision phenomenon between the impeller and the volute pump, if any will repair repair, otherwise the clearance between the impeller and volute large, air pressure does not go on.
