Excavator Operator Certification Exam Prep · Question
During operation, an excavator exhibits inconsistent and jerky hydraulic movements, sometimes 'chattering' or making unusual noises. The fluid level is correct, and the system appears to be under proper temperature. Which common hydraulic fault is most likely indicated by these symptoms?
Inconsistent, jerky movements, 'chattering,' and unusual noises (often described as grinding or bubbling) are classic symptoms of air entrapment or cavitation w
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Question: During operation, an excavator exhibits inconsistent and jerky hydraulic movements, sometimes 'chattering' or making unusual noises. The fluid level is correct, and the system appears to be under proper temperature. Which common hydraulic fault is most likely indicated by these symptoms?
Answer options:
- A severely worn hydraulic pump.
- A partially clogged pilot line filter. ✅ Air or cavitation within the hydraulic system.
- An incorrectly calibrated control valve.
Correct answer: Air or cavitation within the hydraulic system.
Explanation: Inconsistent, jerky movements, 'chattering,' and unusual noises (often described as grinding or bubbling) are classic symptoms of air entrapment or cavitation within the hydraulic system. Air in the fluid compresses and expands, leading to erratic pressure and movement. While worn pumps can cause issues, these specific symptoms strongly point to air/cavitation. The pilot line affects control, not necessarily 'chattering' of the main cylinders.
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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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