Check for clogs in the lubricant strainer.
If the strainer is manufactured in a dual configuration with each strainer having two filter chambers. Please switch it to the other strainer.
Rotating, but water does not come out. Discharge quantity is not enogh to specified capacity.
Over load (Overcurrent) occurs.
Excessive water leakage from stuffing box
Electric motor does not work well with noise.
Water comes out at first, but it doesn't come out soon.