Excavator Operator Certification Exam Prep · Question
While working on a slope, an excavator operator notices that the boom drifts downwards slowly even after the controls are returned to neutral. What hydraulic component is most likely failing or needs adjustment?
Boom drift, especially after controls are released, typically indicates an internal leak within the boom cylinder itself (worn seals) or a malfunction of the ho
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Question: While working on a slope, an excavator operator notices that the boom drifts downwards slowly even after the controls are returned to neutral. What hydraulic component is most likely failing or needs adjustment?
Answer options: ✅ The boom cylinder's holding valve or seal.
- The main hydraulic pump's compensator.
- The slew motor's brake valve.
- The return-to-tank line filter.
Correct answer: The boom cylinder's holding valve or seal.
Explanation: Boom drift, especially after controls are released, typically indicates an internal leak within the boom cylinder itself (worn seals) or a malfunction of the holding valve (also known as a counterbalance valve) associated with the boom cylinder, which is designed to prevent cylinder creep. A compensator relates to pump output, a slew motor brake affects rotation, and a return filter wouldn't cause boom drift.
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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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