Heavy Duty Equipment Technician Red Seal Exam Prep · Question
The hydraulic pump on a rock drill rig is excessively hot to the touch, and the fluid in the reservoir is discoloured and has a burnt smell. What diagnostic step should the technician take first before further analysis?
Excessive heat and burnt fluid indicate system overheating, which can stem from various causes including low fluid level, clogged cooler, or high internal leaka
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Question: The hydraulic pump on a rock drill rig is excessively hot to the touch, and the fluid in the reservoir is discoloured and has a burnt smell. What diagnostic step should the technician take first before further analysis?
Answer options: ✅ Check the hydraulic fluid level and condition, and ensure the cooler is functioning.
- Immediately replace the hydraulic pump as it is clearly failing.
- Increase the setting of the main system relief valve.
- Bleed air from the hydraulic cylinders and lines.
Correct answer: Check the hydraulic fluid level and condition, and ensure the cooler is functioning.
Explanation: Excessive heat and burnt fluid indicate system overheating, which can stem from various causes including low fluid level, clogged cooler, or high internal leakage. Checking the fluid and cooler are primary, non-invasive first steps in diagnosing overheating, as per most OEM troubleshooting guides.
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