If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should __________.

Correct Answer: Option D — check the winch manufacturer's instruction book

Hydraulic systems are sensitive to fluid properties, including viscosity and additive packages. Always consult the manufacturer's instruction book to ensure the correct fluid is used. Using incorrect fluid can lead to pump cavitation, seal degradation, or system failure, potentially rendering critical deck machinery inoperable during mooring operations.