What defines a Class II Leak?

• A. Leakage of hydraulic fluid that forms droplets and drips from the stem
• B. Leakage of grease forming drops but not enough to cause drops that fall from the stem
• C. Any visible leak is acceptable during routine checks
• D. Leakage of fuel that does not form droplets

Answer: (B)

In leak classifications for lubrication systems, a Class II leak means a moderate amount of fluid is escaping as droplets. For grease, this shows up as visible drops forming at the leak point but not a continuous drip that falls away from the stem. This level of leakage is noticeable and requires attention, but it’s not as severe as a steady hydraulic fluid drip or fuel leakage. It signals that a seal, packing, or lubrication path may need servicing or replacement to prevent progression to a larger leak. The other scenarios describe heavier leaks or unrelated fluids, which don’t fit the defined level for a Class II condition.