Excavator Operator Certification Exam Prep · Question
What is the primary purpose of a hydraulic reservoir's breather cap, and what are the consequences of it becoming clogged?
The breather cap ensures the reservoir can 'breathe' during cylinder movement, preventing a vacuum or excessive pressure buildup. A clogged breather can lead to
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Question: What is the primary purpose of a hydraulic reservoir's breather cap, and what are the consequences of it becoming clogged?
Answer options:
- To filter large contaminants from incoming air; a clogged cap leads to rapid fluid decomposition. ✅ To allow air to enter and exit the tank to maintain atmospheric pressure; a clogged cap can create vacuum or pressure imbalances damaging the pump seals.
- To prevent hydraulic fluid from splashing out; a clogged cap causes fluid overflow.
- To indicate the hydraulic fluid level visually; a clogged cap gives inaccurate readings.
Correct answer: To allow air to enter and exit the tank to maintain atmospheric pressure; a clogged cap can create vacuum or pressure imbalances damaging the pump seals.
Explanation: The breather cap ensures the reservoir can 'breathe' during cylinder movement, preventing a vacuum or excessive pressure buildup. A clogged breather can lead to pump cavitation from a vacuum, or seal damage from overpressure, both seriously compromising system health.
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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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