If water contamination in outside gearboxes is a problem, consider the following:

If the gearbox runs continuously, check for cooler leaks. If it runs periodically, think about using desiccant breathers. They will cost a little to maintain, but less than the problems associated with high water content. Look at expansion chambers as an option to water removing breathers. They allow the oil to expand and contract without introducing new (wet) air to the system. Consider off-line water removal. You can employ full-time filters or use a cart periodically. Go ahead and filter dirt while you are at it.

From "Practical Lubrication for Industrial Facilities"

It is important to keep internally and externally generated oil-insoluble deposit-forming particles suspended in the oil. This mechanism reduces the tendency of deposits, which lower operating efficiency, to form in critical areas of machinery. Additives that impart dispersing characteristics are called "dispersants" and "detergents." A dispersant is distinguished from a detergent in that it is nonmetallic, does not leave an ash when the oil is burned and can keep larger quantities of contaminants in suspension.

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