A veteran operator in Mobile told me to check the suction line every shift, and it saved my pump.
He said, 'Listen for a change in the hum, then feel the hose.' Last Tuesday, the engine sound got a bit higher pitched. I shut down and found a softball-sized rock jammed in the elbow joint of the 10-inch line. If I'd run it another hour, the impeller would have been toast. Who else has caught a problem just by sound before it got bad?