🔍 Key Concepts

• Ring-oiled bearings and how they pick up and deliver oil to the shaft/bearing surface • The correct oil level in the sump for ring-lubricated bearings • What happens if the bearing is over-lubricated or under-lubricated

💭 Think About

• How do oil rings actually move oil from the sump to the bearing surface—do they need to move with the shaft in some way? • If the oil level is too high or too low in the sump, what specific problems could that cause for the bearing (overheating, churning, leakage, etc.)? • Which option describes a condition that reliably keeps the bearing surfaces wetted without wasting oil or causing mechanical problems?

✅ Before You Answer

• Confirm that the oil rings must contact the oil in the sump to lift it to the shaft • Decide whether the rings should turn with the shaft, slip on it, or be held stationary for proper operation • Eliminate any options that would submerge the whole bearing or cause obvious over-lubrication or oil churning