🔍 Key Concepts

• Friction and heat in bearings when lubrication is incorrect • Effects of too much vs. too little grease on a bearing • How shaft alignment affects bearing temperature and wear

💭 Think About

• For each option, ask yourself: would this condition increase friction inside the bearing? Why or why not? • Think about what happens to rolling elements when grease cannot circulate properly versus when there is almost no grease at all. • Consider how a misaligned shaft loads the bearing: does it spread the load evenly or concentrate it in a small area?

✅ Before You Answer

• For each choice, decide if it could reasonably cause excess friction and heat in a bearing. • Check whether both improper lubrication (too much or too little) and mechanical misalignment are known causes of overheating. • Before choosing, see if more than one option clearly leads to overheating; then decide what that implies about a possible combined answer choice.