Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A Used Oil Analysis (UOA) report for an articulated dump truck's transmission fluid indicates an abnormally high level of copper and lead, with a normal level of silicon. The transmission is operating at normal temperatures and pressures. What is the most probable cause?
Copper and lead are common components of bearing materials (e.g., bronze or Babbitt linings). Their elevated presence in the absence of silicon (which would ind
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Question: A Used Oil Analysis (UOA) report for an articulated dump truck's transmission fluid indicates an abnormally high level of copper and lead, with a normal level of silicon. The transmission is operating at normal temperatures and pressures. What is the most probable cause?
Answer options:
- Entry of external contaminants from a failed seal. ✅ Elevated internal bearing wear within the transmission.
- Coolant ingress due to a faulty heat exchanger.
- Overheating causing fluid degradation.
Correct answer: Elevated internal bearing wear within the transmission.
Explanation: Copper and lead are common components of bearing materials (e.g., bronze or Babbitt linings). Their elevated presence in the absence of silicon (which would indicate dirt) strongly suggests internal bearing wear within the transmission, requiring further inspection.
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