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Heavy Duty Equipment Technician Red Seal Exam Prep · Question

A maintenance technician receives an oil analysis report for a transmission that shows high levels of copper and lead, with a corresponding increase in a ferrous wear index. The transmission fluid appears dark. What likely component is experiencing accelerated wear?

High levels of copper and lead are characteristic wear metals for bronze or lead-plated bearings, which are common in transmissions. The ferrous wear index also

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Question: A maintenance technician receives an oil analysis report for a transmission that shows high levels of copper and lead, with a corresponding increase in a ferrous wear index. The transmission fluid appears dark. What likely component is experiencing accelerated wear?

Answer options:

  • Clutch disc material ✅ Bearing cages and surfaces
  • Gear teeth
  • Seal material

Correct answer: Bearing cages and surfaces

Explanation: High levels of copper and lead are characteristic wear metals for bronze or lead-plated bearings, which are common in transmissions. The ferrous wear index also points to iron-based component wear. Clutch material is typically organic/synthetic, gear teeth are primarily steel (iron), and seals are rubber/polymer.

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