In which of the listed hydraulic systems will the installation of an oil cooler be necessary?

Correct Answer: Option D — Constant tension mooring winch system

Constant tension mooring winches operate under high, sustained loads, generating significant heat through continuous fluid circulation and pressure relief. Without an oil cooler, the hydraulic fluid would rapidly overheat, causing viscosity breakdown, seal failure, and loss of system control, necessitating active cooling for operational reliability.