Excavator Operator Certification Exam Prep · Question
An operator is experiencing slow and weak hydraulic attachment movement on their excavator. The hydraulic fluid level is correct, and there are no visible external leaks. Which of the following is a common internal hydraulic fault that could cause these symptoms?
A malfunctioning or 'sticking open' main relief valve can divert hydraulic fluid back to the tank prematurely, leading to a loss of pressure and subsequently sl
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Question: An operator is experiencing slow and weak hydraulic attachment movement on their excavator. The hydraulic fluid level is correct, and there are no visible external leaks. Which of the following is a common internal hydraulic fault that could cause these symptoms?
Answer options:
- A clogged return line filter. ✅ A malfunctioning hydraulic main relief valve.
- An overheated hydraulic oil cooler.
- Excessive debris in the hydraulic tank breather.
Correct answer: A malfunctioning hydraulic main relief valve.
Explanation: A malfunctioning or 'sticking open' main relief valve can divert hydraulic fluid back to the tank prematurely, leading to a loss of pressure and subsequently slow and weak attachment movement. A clogged return line filter would primarily affect overall system flow and potentially build reverse pressure, while an overheated cooler might lead to fluid degradation. Debris in the breather is more likely to cause tank pressurization issues.
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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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