Excavator Operator Certification Exam Prep · Question
While operating an excavator, you notice the hydraulic oil temperature gauge consistently indicating higher than normal operating temperatures (e.g., above 90°C), even under light load. The hydraulic fluid level is correct. What preventive maintenance check is most relevant in this situation?
Consistently high hydraulic oil temperature, especially under light load, suggests an issue with heat dissipation. Blocked or dirty oil cooler fins prevent prop
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Question: While operating an excavator, you notice the hydraulic oil temperature gauge consistently indicating higher than normal operating temperatures (e.g., above 90°C), even under light load. The hydraulic fluid level is correct. What preventive maintenance check is most relevant in this situation?
Answer options:
- Checking the hydraulic pump's internal clearances. ✅ Inspecting and cleaning the hydraulic oil cooler fins.
- Verifying the pressure setting of the main relief valve.
- Testing the primary hydraulic filter for bypass.
Correct answer: Inspecting and cleaning the hydraulic oil cooler fins.
Explanation: Consistently high hydraulic oil temperature, especially under light load, suggests an issue with heat dissipation. Blocked or dirty oil cooler fins prevent proper cooling of the hydraulic fluid. Checking pump clearances, relief valve settings, or primary filter bypass are less likely primary causes of systematic overheating under these conditions.
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Question explanations
- During a final inspection of an excavator, prior to beginning work, an operator notices significant play in th
- An excavator operator is preparing to dig a trench in cohesive soil. To achieve maximum breakout force, what a
- Which control typically governs the arm (or dipper arm) movement for an excavator?
- What condition might require sloping or shoring of a trench less than 1.2 meters (4 feet) deep?
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