1. Hydraulic noise- cavitation, suction lift too high. Check with vacuum gauge.
2. Mechanical defects:
a) Shaft bent.
b) Rotating element binds.
c) Bearings worn.
d) Pump and drive unit misaligned.
2. Mechanical defects:
a) Shaft bent.
b) Rotating element binds.
c) Bearings worn.
d) Pump and drive unit misaligned.