5353
Helm Control Systems
Trim Tab Maintenance
The trim tab actuators are electric and require no
routine maintenance except to periodically inspect
the tab actuators for corrosion or marine growth
and test the system to ensure that it is operating
properly.
Marine growth can interfere with the proper op-
eration of the trim tab planes and actuators. To
reduce problems due to marine growth, always
return the trim tabs to the full “UP” position af-
ter operating the boat and periodically inspect
and clean marine growth from the actuators and
planes.
If the boat is kept in the water, the trim tabs
must be equipped with a zinc anode to prevent
galvanic corrosion. Galvanic corrosion is the cor-
rosion process occurring when different metals
are submerged in an electrolyte. Seawater is an
electrolyte and submerged metal components
must be properly protected. The anodes will need
to be changed when they are 75% of their original
size. Refer to the Routine Maintenance chapter of
this manual for information on maintaining zinc
anodes.
To discourage any marine growth on the tabs or
actuators, antifouling paint can be applied. When
applying paint to the actuator, make sure it is fully
retracted. Do not paint the stainless ram above
the area that is exposed when retracted. The
bottom paint will damage the O-ring seals when
the ram is retracted and allow seawater to enter
the actuator motor. Contact your dealer or the
trim tab manufacturer for information regarding
the correct bottom paint for the trim tabs.
Refer to the trim tab owner’s manual for additional
maintenance information, specications, trouble-
shooting and operating instructions.
Bow Thruster Maintenance (Optional)
The bow thruster is mounted in the forward bilge.
Periodically inspect the components inside the
hull for leaks and for loose or corroded electrical
connections. Signs of leaks and loose or corroded
electrical connections should be corrected imme-
diately by a qualied marine technician.
Marine growth, weeds and debris can interfere
with the proper operation of the bow thruster so
you should inspect the tunnel regularly and clean
as necessary. This is particularly important when
operating in areas with weeds or if the thruster is
not responding normally. You should also check
Typical Trim Tab Dual Actuators
Typical Bow Thruster Drive Unit, propeller & tunnel
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