English to French Tech/Engineering Ships, Sailing, Maritime operation and maintenance manual

Capstan – The motor should be periodically checked to ensure it still functions after the capstan has remained unused for long periods of time.
The lubrication of the Capstan gear cabinet has to be checked strictly to the manufactures instructions.

The footswitch and its cabling are highly susceptible to mechanical damage and water ingress. It is it is recommended inspected regularly and replaced, if necessary.

While the drumhead is not susceptible to failure, it can become excessively worn over time and need replacing. A worn and damaged drumhead will impede the function of the capstan by preventing it from efficiently pulling in lines.

Dans ce contexte comment peut-on traduire drumhead ?