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CHAPTER 7
Trim Tabs
Periodically check the trim
tab anodes for galvanic
corrosion. On select units
anodes are attached to the
actual trim tabs located
on the port and starboard
transom. A good rule
of thumb is to replace a
sacrifi cial zinc anode when
it is 30% consumed.
Never paint over the anodes since they will not work properly.
Remember they are softer than the aluminum tab they protect and need
to be free of barnacles, algae and debris to work the best. In the aft bilge
area is located a trim tab pump. Periodically, check
for the correct amount of oil in the reservoir. The
oil is used to lower and raise the hydraulic cylinders
attached to the trim tab plates. Refer to the trim tab
operator’s manual for oil type and viscosity. Also,
check the rams and hoses for leaks. One sign of a
seal leak may be a milky look to the oil or the tabs responding slowly.
A system air leak will normally cause a jerky tab motion.
Refer to the operator’s manual for troubleshooting information.
TYPICAL TRIM TAB PUMP
ANODE
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