Excavator Operator Certification Exam Prep · Question
An excavator experiences a sudden and significant loss of power to all hydraulic functions, but the engine continues to run smoothly. There are no unusual noises from the hydraulic pump or lines. What is the most likely cause?
If the engine runs fine but there is a complete loss of hydraulic power, it points to a failure of the power transmission to the hydraulic pump, such as a broke
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Question: An excavator experiences a sudden and significant loss of power to all hydraulic functions, but the engine continues to run smoothly. There are no unusual noises from the hydraulic pump or lines. What is the most likely cause?
Answer options:
- A clogged hydraulic suction strainer.
- A failed main hydraulic relief valve.
- Multiple hydraulic cylinders with internal bypass. ✅ A broken drive coupling between the engine and the hydraulic pump.
Correct answer: A broken drive coupling between the engine and the hydraulic pump.
Explanation: If the engine runs fine but there is a complete loss of hydraulic power, it points to a failure of the power transmission to the hydraulic pump, such as a broken drive coupling. A clogged suction strainer would cause cavitation and noise, a failed main relief valve would bypass flow, and internal cylinder bypasses would affect individual functions, not all of them simultaneously and completely.
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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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