If equipment specifies an AGMA 7, which lubricant should be used from the following options?

When the equipment specifies an AGMA 7, it is referring to a specific viscosity grade according to the American Gear Manufacturers Association standards. AGMA 7 corresponds to an ISO viscosity grade of approximately 460, which is designed for high-loaded gears and can effectively handle high temperatures and heavy stress conditions.

Therefore, selecting a lubricant that falls within this viscosity range is essential for ensuring optimal performance of the machinery. ISO VG 460 or an SAE 140 gear oil aligns with the requirements of AGMA 7 and will provide suitable lubrication for the intended application. This level of viscosity will help maintain the film strength necessary for preventing wear and ensuring efficiency in the gear operation.

Other options do not match the viscosity requirements of AGMA 7 effectively, as they either provide insufficient viscosity, which could lead to inadequate lubrication, or are not directly comparable to the AGMA classification system. This highlights the importance of using the correct viscosity lubricant as specified by the AGMA rating to ensure the longevity and reliability of gear systems.