Which statement best defines a Class II leak?

• A. Leakage of hydraulic fluid that forms droplets and drips from the stem
• B. No leakage is allowed
• C. Any visible leak is acceptable
• D. Leakage of grease forming drops but not enough to cause drops that fall from the stem

Answer: (D)

Classifying leaks by severity and the lubricant involved helps maintenance decide what action is needed. A Class II leak means you can see grease forming small drops at the seal or stem, but it isn’t enough to produce continuous dripping or large losses. This shows moderate leakage that warrants attention, without indicating a catastrophic or severe failure. It’s distinct from a hydraulic fluid leak, which would involve hydraulic oil leaking and dripping from the stem, and from notions that zero leakage or any visible leak is acceptable. So the description of grease forming drops without full dripping directly matches what a Class II leak is.