To enhance a motor's service life, which of the following should NOT be done?

Removing the winding insulation is detrimental to a motor's service life. The insulation on the winding is critical as it serves to prevent electrical shorts and reduce the risk of short-circuit conditions that can lead to motor failure. In addition, it protects the coils from moisture, dust, and other environmental factors that could degrade their performance. When the insulation is compromised or removed, it exposes the windings to these hazards, which can cause overheating, resistance changes, and ultimately lead to premature failure of the motor.

The other actions listed contribute positively to the motor's longevity. Regular maintenance checks help identify potential issues before they escalate. Monitoring operating temperatures ensures the motor does not exceed safe limits, preventing damage due to overheating. Ensuring proper lubrication minimizes friction and wear on moving parts, further extending the operational life of the motor.