Mercury 300 XS OptiMax Manual page 60

1. Turn out the manual tilt release valve three turns (counterclockwise). This
allows manual tilting of the outboard.
2. Tilt the outboard to the desired position and tighten the manual tilt release
valve.
NOTE: The manual tilt release valve must be tightened before operating the
outboard to prevent the outboard from tilting up during reverse operation.
FEATURES AND CONTROLS
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