Block sheave bearings should be lubricated with oil.

• A. Sometimes
• B. Yes
• C. Always
• D. No

Answer: (D)

Block sheave bearings are typically designed to run with grease or to come sealed from the factory. Oil is not used because it can leak out, attract dirt, and contaminate the rope or moving surfaces, creating a safety and performance issue. Grease, on the other hand, forms a thick film that stays in place, providing durable lubrication at the speeds and loads these blocks experience and reducing the need for frequent re-lubrication.

If a block is specified to be lubricated, always follow the manufacturer's guidance, usually using a suitable grease rather than oil. Some blocks are sealed and require no field lubrication at all. So the statement that block sheave bearings should be lubricated with oil is not correct.