Inspection and repair after brushless DC pump failure

1. Check whether the shaft of the brushless DC water pump is bent, the degree of wear of the journal, and whether the thread of the shaft end is damaged. Check whether the blade on the impeller is broken or the shaft hole is seriously worn. Check the degree of wear of the water seal and bakelite gasket, if it exceeds the usage limit, it should be replaced with a new one. Check the wear of the bearing, you can use the table to measure the clearance of the bearing, you should replace the new bearing.

2. After the pump is taken out, it can be decomposed in order. After disassembly, the parts should be cleaned, and then checked one by one to see if there are defects such as cracks, damage and wear. If there are serious defects, they should be replaced.

3. Repair of water seal and seat: If the water seal is worn and grooved, it can be smoothed with sand cloth.

4. The bending of the pump shaft should not exceed 0.05mm, otherwise it should be replaced. Impeller blade damage should be replaced. If the pump shaft bore is seriously worn, it should be replaced or repaired.

5. Check whether the pump bearing rotates flexibly or has abnormal noise. If there is any problem with the bearing, it should be replaced.

6. After the water pump is assembled, turn it by hand, the pump shaft should be free of stagnation, and the impeller and the pump casing should not rub. Then check the displacement of the pump. If there is a problem, the cause should be checked and eliminated.