Bearing Rescue

A fan bearing is running warm and the operator reports a new noise. Bearings speak clearly to anyone who listens: temperature, sound and vibration each tell part of the story. You are the one who has to decide - lubricate, monitor, or change it out before it takes the machine down at the worst possible moment.

Bearing care is core millwright and marine engineering work. Strong scores here feed the Industrial Mechanical, Marine and Power/Energy pathways.

• Recognize bearing failure modes from symptoms
• Apply lubrication quantity and contamination principles
• Relate vibration frequency patterns to bearing faults
• Choose the right maintenance action for the evidence

• Overgreasing is as harmful as undergreasing
• Bearing noise, heat and vibration all rise as damage progresses
• Specific vibration frequencies identify inner race, outer race and ball faults
• The right action depends on the stage of the failure curve

• Treat each question as a maintenance decision, not a quiz answer
• For numeric questions, keep units consistent (grams, hours)
• Read explanations to learn the failure-stage reasoning
• Watch for the safety-first options - they are never wrong choices

• 10 points per question plus streak bonuses
• Hints cost 3 points
• Pass each level with 70% or more

Explanations describe what is physically happening inside the bearing - the model that turns symptoms into confident decisions.

• Pumping grease until it purges out the seals
• Mixing incompatible grease types
• Blasting a screaming bearing with more grease instead of planning replacement
• Ignoring rising temperature trends because the machine 'still runs'