23
Systems
TRIM SYSTEM OVERVIEW
Your stern drive vessel features both an outdrive controlled
power trim and vessel transom mounted trim tab system.
They use hydraulic cylinders which are driven electrically
by a motor and valves which control the bow rise or port
and starboard heeling angles depending on the particular
system on your vessel.
Power Trim
The power trim system features a dash reference trim
gauges. As the trim switches located on the remote control
are activated the gauge will show a up or down resulting
angle movement of the stern drive which effects bow
rise.
The power trim
system features an
electric D.C. motor,
hydraulic pump, and
reservior. As the trim
is activated fluid
moves proportionally
through the system.
The pump reservior
system should be
periodically checked
for hydraulic fluid
levels. See the engine manufacturer’s engine owner’s
manual for specifications and capacity of trim lubricant.
TYPICAL POWER TRIM GAUGE
PORT STARBOARD
The power trim is normally used prior to accelerating onto
a plane, after reaching the desired RPM or boat speed, and
when there is a change in water or boating conditions.
Position passengers and equipment in the boat so that the
weight is balanced correctly fore and aft as well as side to
side. Trimming will not compensate for an unbalanced load.
To operate the trim, push the switch until the desired bow
position is reached. The trim may be operated at any boat
speed or at rest. Avoid operating the trim system when
running in reverse. Observe the trim/tilt gauge which
indicates the boat’s bow position achieved by the trim angle
of the vertical drive unit. “Bow-Up” corresponds to the
upper portion of the trim range on the gauge while “Bow
Down” corresponds to the lower portion of the trim range
on the gauge.
To determine the proper trim angle, experiment a little until
you are familiar with the changes in your boat. The vessel
will be properly trimmed when the trim angle provides the
best boat performance for the particular operating
conditions. A trim position that provides balanced steering
load is most desirable.
To familiarize yourself with the power trim, make test runs
at slower speeds and at various trim positions to see the
effect of trimming. Note the time it takes for the boat to
plane. Watch the tachometer and speedometer readings as
well as the ride action of the boat.
AVOID POSSIBLE INJURY
OR PROPERTY DAMAGE!
RETAIN CONSTANT VISIBILITY OF OTHER
BOATS, OBSTACLES, AND SWIMMERS
DURING BOW- RISE TRANSITIONAL PERIODS
TO PLANING ALTITUDE.
!
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