PRODUCT OVERVIEW
12/05
ZT370 Operation Manual
17
Stern-Drive Trim Angle
Trim angle is the angular relationship
between the stern-drive and the transom of
the vessel. Vessel trim while underway
greatly affects vessel performance and
efficiency. For best results, the vessel
should be on plane and trimmed to reduce
the wet surface. With less vessel in the
water, both speed and fuel economy
increase. The power trim should be
adjusted continuously for best results.
If the stern-drive is trimmed in “bow-down”
too far (stern-drive is closer to
the transom), the speed drops, fuel
economy decreases and the vessel may
not handle correctly. However, it does
provide better acceleration from a
standstill, and because it forces the bow
down, visibility is improved.
If the stern-drive is trimmed out “bow-up”
too far (stern-drive is away from
the transom), steering torque may
increase, the vessel may be difficult to get
on a plane and may bounce.
Trim and Tilt/Trailering Switch
Raising and lowering of the stern-drive is
controlled by the combination trim and
tilt/trailering switch.
The trim portion of the switch operates the
trim system in either the “bow-up” or
“bow-down” directions.
The tilt portion (or trailering portion) of the
switch operates the tilt system for
trailering, beaching, launching and shallow
water operation (low-speed below 1200
min
-1
(rpm)).
CAUTION
Never raise the stern-drive into the
tilt/trailering range when the engine is
operating above 1200 min
-1
(rpm).
Damage to the stern-drive may result.
The switch is located on the remote control
handle or on the vessel’s dash panel.
Single stern-drive applications will have
one switch.
Dual stern-drive applications can have
either one integral switch to operate both
stern-drives or may have a separate switch
for each stern-drive.
CAUTION
Always raise and lower dual
stern-drives evenly together. Damage to
the tie bar connecting the two
stern-drives together could result from
twisting or binding if the stern-drives
are raised or lowered separately.
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