Excavator Operator Certification Exam Prep · Question
A heavy equipment technician is troubleshooting an excavator that cannot effectively dig hard material. The engine RPM is stable, and the hydraulic pump appears to be functioning, but the bucket curl force is significantly reduced. All other hydraulic functions seem normal. What is the most probable cause?
If only the bucket curl force is reduced while other functions are normal, it strongly indicates an issue localized to the bucket cylinder, such as worn seals.
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Question: A heavy equipment technician is troubleshooting an excavator that cannot effectively dig hard material. The engine RPM is stable, and the hydraulic pump appears to be functioning, but the bucket curl force is significantly reduced. All other hydraulic functions seem normal. What is the most probable cause?
Answer options:
- Broken boom cylinder
- Malfunctioning main hydraulic relief valve ✅ Worn bucket cylinder seals
- Blocked hydraulic cooler
Correct answer: Worn bucket cylinder seals
Explanation: If only the bucket curl force is reduced while other functions are normal, it strongly indicates an issue localized to the bucket cylinder, such as worn seals. Worn seals allow fluid to bypass the piston, reducing the effective force. A malfunctioning main relief valve or blocked cooler would affect the entire hydraulic system or cause overheating, not just one specific function. A broken boom cylinder would affect the boom's movement, not the bucket curl.
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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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