Excavator Operator Certification Exam Prep · Question
An operator is experiencing slow and weak boom lift despite the engine running at full RPM. The stick and bucket functions appear normal. The excavator has a dual-pump hydraulic system. What system component is the most likely culprit?
If only one function (like the boom) is affected in an excavator with a dual-pump system, and other functions are normal, it strongly suggests an issue with the
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Question: An operator is experiencing slow and weak boom lift despite the engine running at full RPM. The stick and bucket functions appear normal. The excavator has a dual-pump hydraulic system. What system component is the most likely culprit?
Answer options:
- A faulty load-sensing valve in the boom circuit.
- Blocked pilot lines to the main control valve. ✅ A problem with one of the main hydraulic pumps.
- Pressure relief setting for the stick or bucket circuit being too low.
Correct answer: A problem with one of the main hydraulic pumps.
Explanation: If only one function (like the boom) is affected in an excavator with a dual-pump system, and other functions are normal, it strongly suggests an issue with the specific main hydraulic pump dedicated to that function. A faulty load-sensing valve could cause issues, but a main pump problem is more likely to cause isolated, general weakness. Blocked pilot lines would likely affect multiple functions or cause erratic operation, and low relief settings for stick/bucket wouldn't directly cause a weak boom.
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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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