Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A technician is troubleshooting a dozer with reduced hydraulic power. A recent oil analysis report for the hydraulic system showed elevated levels of both iron and chromium, with no significant increase in silicon. The dozer has 8,000 operational hours. What component is most likely experiencing wear?
Iron and chromium are primary constituents of hardened steel components, such as those found in hydraulic pumps, motors, and cylinders (pistons, barrels, swashp
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Question: A technician is troubleshooting a dozer with reduced hydraulic power. A recent oil analysis report for the hydraulic system showed elevated levels of both iron and chromium, with no significant increase in silicon. The dozer has 8,000 operational hours. What component is most likely experiencing wear?
Answer options:
- Rubber seals and O-rings.
- Bronze bushings. ✅ Hydraulic pump or motor components (e.g., piston, barrel, swashplate).
- External dirt ingress through breathers.
Correct answer: Hydraulic pump or motor components (e.g., piston, barrel, swashplate).
Explanation: Iron and chromium are primary constituents of hardened steel components, such as those found in hydraulic pumps, motors, and cylinders (pistons, barrels, swashplates, valve plates). Elevated levels without increased silicon strongly suggest internal abrasive or fatigue wear of these critical hydraulic components, leading to reduced hydraulic power.
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