Excavator Operator Certification Exam Prep · Question
An excavator's hydraulic relief valve repeatedly opens, causing the boom to 'chatter' under load despite the pump sounding normal. Which of the following is the most probable cause?
If the relief valve activates at lower pressures than intended, it will prematurely open, causing the system to bypass fluid and leading to chatter or loss of p
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Question: An excavator's hydraulic relief valve repeatedly opens, causing the boom to 'chatter' under load despite the pump sounding normal. Which of the following is the most probable cause?
Answer options:
- A perfectly seated and functioning relief valve.
- A clogged return line filter.
- A worn or damaged hydraulic cylinder packing seal. ✅ An improperly adjusted or faulty relief valve setting.
Correct answer: An improperly adjusted or faulty relief valve setting.
Explanation: If the relief valve activates at lower pressures than intended, it will prematurely open, causing the system to bypass fluid and leading to chatter or loss of power under load. This suggests an issue with the valve's setting or internal condition.
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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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