The Maybach of boats | Hull pimples | Boating laughs - 9/25/25
⚓US Coast Guard Captain's LicensePractice Question - Answer
A. An air leak in the pump suction line above the oil level in the reservoir
The noise produced by a hydraulic pump with air in the system is caused by a phenomenon called cavitation, which occurs when air bubbles are compressed and then collapse inside the pump. This creates a noisy whine.
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