U.S. Motors pool pump is very loud during operation, with a high-pitched whine or grinding noise from the motor end.

Safety first: Turn off power and lock out the breaker before working on the pump.

• Isolate noise source: Use a mechanic's stethoscope or a long screwdriver to listen at the motor body versus the pump housing. Loud noise at the motor indicates bearing issues.
• Check for shaft play: With power off, grasp the motor shaft and attempt to move it side-to-side. Excessive play confirms bearing wear.
• Inspect for leaks: Look for water trails or rust at the motor face where it meets the pump seal plate. A leaking shaft seal can wash out bearings.
• Plan replacement: While bearings can sometimes be replaced by a motor shop, for most field repairs it is more practical to replace the complete U.S. Motors pool pump motor assembly and a new shaft seal at the same time.
• Replace shaft seal: Whenever replacing the motor, install a new mechanical shaft seal compatible with the U.S. Motors pump wet end to prevent future bearing damage.