How many basic methods are used to lubricate a gear drive system?

• A. 2
• B. 4
• C. 3
• D. 5

Answer: (B)

Gears can be lubricated in four primary ways, chosen to match gear size, speed, and load. Splash lubrication relies on rotation to lift oil from a reservoir so the gear teeth dip into an oil film. Circulated or forced-feed lubrication uses a pump to continuously deliver oil to critical bearings and gear surfaces, ensuring constant film protection. Spray or mist lubrication deposits a fine oil spray on the gear teeth for good coverage with potentially less oil. Grease lubrication applies grease directly to the gear cavity or bearings, with the grease redistributing as the gears move. Each method offers different maintenance needs and performance benefits, so four distinct approaches cover most gear-drive situations.