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Any pump or valve is repairable. They are a series of "O", springs, gaskets, bearings, etc... providing the casings have not been compromised. The worst contaminant is debri/metal filings that damage the rings and the walls. Water not a horrible culprit (rust). Jamming the steering wheel for starboard or port turn is can mess with the internals. A little piece off any of internals can wreak havoc. Gentle use goes a long way for preserving. Before firing up the system, check the cylinders by the motor, if pitted or some rust, polish with some emery cloth.
Garris