Heavy Duty Equipment Technician Red Seal Exam Prep · Question
When troubleshooting a direct-drive planetary final drive assembly on an excavator, you observe excessive heat and metal shavings in the final drive oil. What is the most likely cause?
Excessive heat and metal shavings are classic symptoms of mechanical wear, particularly in rotating components under load. A worn or spalled planet gear bearing
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Question: When troubleshooting a direct-drive planetary final drive assembly on an excavator, you observe excessive heat and metal shavings in the final drive oil. What is the most likely cause?
Answer options: ✅ A worn or spalled planet gear bearing
- Insufficient hydraulic pressure to the parking brake
- A clogged hydraulic oil cooler for the transmission
- Incorrect engine oil viscosity
Correct answer: A worn or spalled planet gear bearing
Explanation: Excessive heat and metal shavings are classic symptoms of mechanical wear, particularly in rotating components under load. A worn or spalled planet gear bearing would generate significant friction and metal particles within the final drive lubricant.
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