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Chapter 4
When trimmed or in the bow down position, the
bow spray is farther forward, the wake is smaller, and
positioned further behind the vessel. Also, when trimmed
you will notice that the tachometers show an increase in
rpm’s.
Rectifying A List
Your vessel can use the trim tabs to
rectify a list. e trim tabs adjust the
boat’s attitude in the direction the
helm rocker switch is pushed.
If the port bow is high, push the le -
hand “bow down” direction on the
dash rocker and the port bow will
lower. If the starboard bow is high,
push the right-hand “bow down”
direction and the starboard bow is
lowered.
Porpoising is a running condition where the bow
“bounces” up and down similar to a porpoise motion.
Press “bow down” in one-half second bursts. As the trim
tabs turn, the porpoising should recede and the vessel
speed should increase. Only a small amount of “bow
down” is normally necessary to make this change.
Porpoising
Trim Tab Pump
The trim tab pump is
located in the bilge.
It supplies a special
hydraulic fluid to the
transom based trim tab
cylinders which move up
and down with the rocker
switches to operate the
actual trim tab plates
attached to the cylinders
at the trannsom.
Periodically check the
pump level. Fill with
speci ed uids as notated
in the vendor trim tab
information. Also, check hose for leaks and ensure all
connections are tight.
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