Excavator Operator Certification Exam Prep · Question
The manufacturer's manual specifies a cold hydraulic oil level should be checked with the boom and stick fully retracted and the bucket curled in. An operator checks the level with the boom fully extended. How will this affect the observed oil level in the sight glass?
When the boom is extended, more hydraulic fluid is contained within the cylinders, leaving less in the reservoir. Therefore, checking the level with the boom ex
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Question: The manufacturer's manual specifies a cold hydraulic oil level should be checked with the boom and stick fully retracted and the bucket curled in. An operator checks the level with the boom fully extended. How will this affect the observed oil level in the sight glass?
Answer options: ✅ The observed oil level will appear lower than the actual correct level for operation.
- The observed oil level will appear higher than the actual correct level for operation.
- It will have no significant effect on the oil level reading.
- The reading will be accurate only if the engine is running and warm.
Correct answer: The observed oil level will appear lower than the actual correct level for operation.
Explanation: When the boom is extended, more hydraulic fluid is contained within the cylinders, leaving less in the reservoir. Therefore, checking the level with the boom extended will show a lower-than-actual reading in the sight glass compared to the specified retracted position, potentially leading to overfilling. (Manufacturer Manuals, OPSWA Excavator Operator Curriculum)
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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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