Mercury 300R HD CMS Mechanical, Operation And Maintenance Manual, Page: 41 / 99

LOSS OF SHIFT COMMAND
When the Engine Guardian system detects a loss of shift control (fault code
339‑23), the warning horn will beep and the engine RPM will be limited.
SmartCraft gauges which have the ability to display text will alert the operator
with a short text, long text, and the action which the operator should follow.
SmartCraft Displayed Text
Short text Reverse Gear Unavailable
Long text Reverse gear is not available. Moving control lever into reverse will
result in a forward gear shift. Engine power is limited.
Action Return to port immediately ‑ Service engine before next use.
IMPORTANT: Engine Guardian loss of shift command will only allow the engine
to be shifted into forward or neutral; access to reverse gear is not possible.
Operation of the outboard will be extremely limited when the Engine Guardian
system detects a loss of shift control fault. The outboard will only shift from
neutral to forward after the remote control handle is advanced to approximately
the mid‑throttle position. Engine RPM will not increase until after forward gear
engagement. The throttle will be limited to approximately 1000 RPM to allow
emergency boat operation. If the remote control shift handle is moved from
neutral into reverse, the lower unit will shift into forward gear.
Power Trim and Tilt
The outboard has a trim/tilt control called power trim. This enables the operator
to easily adjust the position of the outboard by pressing the trim switch. Moving
the outboard in closer to the boat transom is called trimming in or down. Moving
the outboard further away from the boat transom is called trimming out or up.
The term trim generally refers to the adjustment of the outboard within the first
20° range of travel. This is the range used while operating the boat on plane.
The term tilt is generally used when referring to adjusting the outboard further
up out of the water. The outboard can be tilted up past the trim range for
shallow water operation or loading the boat onto a trailer. With the engine
turned off and ignition switch turned on, the outboard can be tilted out of the
water.
• Below 2000 RPM the engine can be trimmed or tilted to any range.
Caution is advised when operating the engine past the tilt range. Ensure
the water pickups are submerged.
• While in the trim range and the engine is above 2000 RPM, you can only
trim to the maximum trim range.
• If the engine is below 2000 RPM and is in the trailer range, advancing the
throttle will allow the engine to achieve a maximum RPM of 4250. Engine
operation in this capacity (above the normal 2000 limit) should only be
used for loading or unloading the boat onto or off the trailer. It should not
be used during normal boat operation.
FEATURES AND CONTROLS
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