Mercury 75 Operation Maintenance Warranty Installation Manual page 64

POWER TRIM OPERATION
NOTE: When traveling at slow speeds, a slight drop in engine RPM may be
noticed on occasion when engaging power trim. This condition is normal and
has no adverse affect on the outboard.
With most boats, operating around the middle of the trim range will give
satisfactory results. However, to take full advantage of the trimming capability
there may be times when you choose to trim your outboard all the way in or
out. Along with an improvement in some performance aspects comes a greater
responsibility for the operator, and this is being aware of some potential control
hazards.
The most significant control hazard is a pull or torque that can be felt on the
steering wheel or tiller handle. This steering torque results from the outboard
being trimmed so that the propeller shaft is not parallel to the water surface.
Trimming the outboard beyond a neutral steering condition may result in a
pull on the steering wheel or tiller handle and loss of boat control. Maintain
control of the boat if trimming beyond a neutral steering condition.
Consider the following lists carefully.
1. Trimming in or down can:
• Lower the bow.
• Result in quicker planing off, especially with a heavy load or a stern
heavy boat.
• Generally improve the ride in choppy water.
• Increase steering torque or pull to the right (with the normal right‑hand
rotation propeller).
• In excess, can lower the bow of some boats to a point where they
begin to plow with their bow in the water while on plane. This can
result in an unexpected turn in either direction (called bow steering or
oversteering) if any turn is attempted, or if a significant wave is
encountered.
Operating the boat at high speeds with the outboard trimmed too far under
can create excessive bow steer, resulting in the operator losing control of
the boat. Install the trim limit pin in a position that prevents excessive trim
under and operate the boat in a safe manner.
• In rare circumstances, the owner may decide to limit the trim in. This
can be accomplished by purchasing a stainless steel tilt pin from your
dealer and inserting it in whatever adjustment hole in the transom
brackets is desired. The nonstainless steel shipping bolt should not be
used in this application.
2. Trimming out or up can:
FEATURES AND CONTROLS
!
WARNING
!
WARNING
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