Heavy Duty Equipment Technician Red Seal Exam Prep · Question
An oil analysis report for a final drive indicates a significant increase in viscosity and a higher than normal acid number, but wear metals are within acceptable limits. The machine operates in a cold climate. What is the most probable cause for these findings?
Increased viscosity and a higher acid number without significant wear metals typically point to oil degradation due to oxidation. Overheating, even localized, c
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Question: An oil analysis report for a final drive indicates a significant increase in viscosity and a higher than normal acid number, but wear metals are within acceptable limits. The machine operates in a cold climate. What is the most probable cause for these findings?
Answer options:
- Water contamination in the final drive oil. ✅ Overheating of the final drive causing oil oxidation.
- Incorrect grade of oil used for the severe cold conditions.
- A worn internal seal allowing dirt ingress.
Correct answer: Overheating of the final drive causing oil oxidation.
Explanation: Increased viscosity and a higher acid number without significant wear metals typically point to oil degradation due to oxidation. Overheating, even localized, can accelerate this process, leading to the breakdown of the oil's base stock and additives, regardless of the climate.
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