Excavator Operator Certification Exam Prep · Question
An operator is using a hydraulic breaker attachment on an excavator to demolish concrete. After about 30 minutes of continuous operation, the breaker's impact force significantly decreases. There are no visible hydraulic hose leaks. What is the most probable cause?
A common cause for a decrease in impact force on a hydraulic breaker, especially over time, is a depleted nitrogen charge in its accumulator. The accumulator he
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Question: An operator is using a hydraulic breaker attachment on an excavator to demolish concrete. After about 30 minutes of continuous operation, the breaker's impact force significantly decreases. There are no visible hydraulic hose leaks. What is the most probable cause?
Answer options: ✅ The nitrogen accumulator on the breaker has lost its charge.
- The main hydraulic pump on the excavator is overheating.
- The bucket pivot pins are experiencing excessive wear.
- The excavator's engine is experiencing a slight power loss.
Correct answer: The nitrogen accumulator on the breaker has lost its charge.
Explanation: A common cause for a decrease in impact force on a hydraulic breaker, especially over time, is a depleted nitrogen charge in its accumulator. The accumulator helps store and release energy for the impact mechanism. While overheating or engine issues could affect performance, a lost nitrogen charge directly impacts the breaker's specific function. Bucket pivot pins are not related to breaker impact force.
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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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