Question 38Motor Plants - QMED

The correct answer is D) not replacing the bowl O-rings that have taken a permanent set. The most common cause of operating failure after reassembling a modern centrifuge is due to the failure to replace the bowl O-rings that have taken a permanent set. Over time, the constant exposure to heat, pressure, and vibration can cause the O-rings to deform and lose their sealing ability. If the O-rings are not replaced during periodic maintenance, the centrifuge may experience leaks, uneven operation, or even a catastrophic failure when reassembled and put back into service. The other answer choices are not the most common causes of failure. Low drive motor RPM, excessive back pressure, and issues with the water supply are less likely to occur compared to the degradation of the critical O-ring seals.