Excavator Operator Certification Exam Prep · Question
An excavator operator is experiencing slow and jerky movements when operating the boom and stick simultaneously, but individual functions seem normal. The hydraulic oil level is correct, and there are no visible leaks. What is the most likely cause of this issue?
Slow and jerky movements, especially during combined operations, often indicate an issue with the hydraulic priority valve. This valve ensures adequate flow to
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Question: An excavator operator is experiencing slow and jerky movements when operating the boom and stick simultaneously, but individual functions seem normal. The hydraulic oil level is correct, and there are no visible leaks. What is the most likely cause of this issue?
Answer options:
- Clogged hydraulic return line filter
- Worn boom cylinder seals ✅ Malfunctioning hydraulic priority valve
- Low engine RPM
Correct answer: Malfunctioning hydraulic priority valve
Explanation: Slow and jerky movements, especially during combined operations, often indicate an issue with the hydraulic priority valve. This valve ensures adequate flow to critical functions, and a malfunction can restrict flow to secondary functions when multiple are used. Worn cylinder seals would typically result in drift or loss of power in the affected cylinder, and a clogged return filter would affect overall system pressure or cause overheating, not necessarily jerky combined movements.
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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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