Which sequence describes removing and replacing a worn bearing in a motor?

Which sequence describes removing and replacing a worn bearing in a motor?

• A. Hammer the bearing out; cool with water; tap new bearing in by hand
• B. Soak bearing in oil; press in with fingers
• C. Remove with bearing pullers; heat bearing with induction heater; fit new bearing with power press and an even-pressure pipe
• D. Cut shaft; weld new bearing; rework housing

Answer: (C)

Removing and replacing a worn bearing should be done with controlled methods that apply force evenly and use heat to expand the bearing, not the shaft. Start by pulling the old bearing out with a bearing puller so you don’t mar races or the shaft. Then heat the bearing outer race with an induction heater so the outer ring expands enough to slide off the shaft without overheating the shaft or housing. When installing the new bearing, use a power press and an even-pressure adapter (a pipe or similar contact surface) to press the bearing on evenly around the outer race, preventing cocking or damage. After seating, check that the bearing is fully seated and aligned, and reassemble with proper lubrication. These steps avoid damage from hammering, thermal shock from water cooling, or destructive methods like cutting the shaft or welding, and they ensure a secure, accurate fit.

Removing and replacing a worn bearing should be done with controlled methods that apply force evenly and use heat to expand the bearing, not the shaft. Start by pulling the old bearing out with a bearing puller so you don’t mar races or the shaft. Then heat the bearing outer race with an induction heater so the outer ring expands enough to slide off the shaft without overheating the shaft or housing. When installing the new bearing, use a power press and an even-pressure adapter (a pipe or similar contact surface) to press the bearing on evenly around the outer race, preventing cocking or damage. After seating, check that the bearing is fully seated and aligned, and reassemble with proper lubrication. These steps avoid damage from hammering, thermal shock from water cooling, or destructive methods like cutting the shaft or welding, and they ensure a secure, accurate fit.