True or False: On an electrical system, motor bearings should be greased annually.

• A. True
• B. False
• C. Not Specified
• D. Sometimes

Answer: (A)

Lubricating motor bearings is a key part of preventive maintenance because the lubricant forms a film that reduces friction, carries heat away, and helps prevent wear and corrosion. For many standard motors, a yearly lubrication interval is used as a baseline practice. Re-lubricating annually helps ensure the grease remains effective, maintains the correct viscosity, and prevents grease degradation from heat and contaminants. Of course, the exact interval depends on bearing type, grease specification, enclosure, and service conditions—some bearings are sealed-for-life and don’t require lubrication, while others in harsher environments may need more frequent attention. But as a general rule in many maintenance programs, greasing annually is a practical and common expectation.