Gearcase Lubrication - Mercury 40 SeaPro Operation, Maintenance & Installation Manual

2. Remove fill cap and check fluid level. The fluid level should be even with
the bottom of the fill hole. Add Quicksilver or Mercury Precision Lubricants
Power Trim and Steering Fluid. If not available, use automotive (ATF)
automatic transmission fluid.

Gearcase Lubrication

When adding or changing gearcase lubricant, visually check for the presence of
water in the lubricant. If water is present, it may have settled to the bottom and
will drain out prior to the lubricant, or it may be mixed with the lubricant, giving it
a milky colored appearance. If water is noticed, have the gearcase checked by
your dealer. Water in the lubricant may result in premature bearing failure or, in
freezing temperatures, will turn to ice and damage the gearcase.
Examine the drained gearcase lubricant for metal particles. A small amount of
metal particles indicates normal gear wear. An excessive amount of metal
filings or larger particles (chips) may indicate abnormal gear wear and should
be checked by an authorized dealer.
DRAINING GEARCASE
1. Place outboard in a vertical operating position.
2. Place a drain pan below outboard.
3. Remove vent plug and fill/drain plug and drain lubricant.
GEARCASE LUBRICANT CAPACITY
Gearcase lubricant capacity is approximately 440 ml (14.9 fl oz).
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MAINTENANCE
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Vent plug
Fill/drain plug