Causes: single phasing (lost one power phase), seized pump impeller, insufficient voltage, or motor winding damage. Solutions: check all three power phases, verify supply voltage, manually check if pump shaft rotates freely, and inspect motor windings with multimeter.

Causes: insufficient lubrication, over-greasing, misalignment, excessive load, or bearing wear. Solutions: check lubrication level and quality, verify proper alignment, inspect for excessive radial or axial loads, and replace bearings if worn or damaged.

Causes: fluctuating inlet pressure, unstable power supply, cavitation, impeller damage, or bearing wear. Solutions: stabilize suction conditions, check power supply quality, inspect impeller for damage, verify bearings are in good condition, and ensure pump operates within stable range.

Solutions: 1) Tighten flange bolts evenly, 2) Replace damaged or deteriorated gasket, 3) Check pipe alignment for stress on connection, 4) Ensure proper gasket material for the chemical, 5) If threaded connection, reseal with appropriate thread sealant.

Causes: pump operating off-design point (too low flow), bearing failure, misalignment, cavitation, or excessive discharge pressure. Solutions: verify system valve positions, check for clogged discharge line, inspect bearings, ensure proper flow through pump, and verify suction conditions.

Causes: lost prime, clogged suction line, air leak in suction pipe, impeller damaged or worn, suction lift too high, check valve stuck closed, or pump rotating in wrong direction. Solutions: reprime pump, inspect and clean suction strainer, check suction line for leaks, verify rotation direction.