The provided documentation details the installation and operation of Lenco trim tab systems, including retrofit kits for Bennett trim tabs. The information focuses on mechanical installation procedures, electrical connections, and basic operational guidance for navigating specific sea conditions. The documentation emphasizes proper mounting, wiring, and maintenance to ensure optimal performance and corrosion resistance.
Installation Procedures
Lenco trim tab installation involves several key steps, beginning with determining the installation location. When laying out the trim tab kit, it is noted that drilling through the transom may be required. If drilling is not feasible at the desired bracket location, a 3/8" hole can be drilled 4" from the bracket location.
The installation of upper and lower standard mount mounting brackets and actuators requires specific attention to bolt sizes. The upper mounting bracket, featuring four holes, should be loosely attached to the top of the actuator using 5/16-18" X 1-3/4" large hex head bolts and 5/16-18 hex nuts. Maximum allowable deviation from center is 45 degrees. Shims (Lenco part #50015-002D) are recommended for lengths greater than 1/8" (3.2 mm).
For retrofit applications, Lenco Marine’s RetroFit Kit is designed as a direct replacement for the Bennett hydraulic power unit (HPU) on systems utilizing Bennett's 4-ring standard trim tab actuators. Installation requires careful adherence to the provided instructions and drawings. The documentation specifically instructs users to cut the wire connector from the Bennett wire harness where the pump is located.
After mounting the control box, the keypad cable must be fed through a 2" hole and connected to the backside of the box. Each digital tactile switch incorporates a retractor wire (orange) originating from the control box.
Electrical Connections and System Checks
Electrical connections are a critical aspect of the installation process. The documentation highlights the function of the digital tactile switches, noting that when activated (for 1 to 2 seconds), the LED displays show one up arrow on each side of the switch. This indicates that both tabs are fully retracted.
The operation of all Lenco switches is based on the position of the bow. The retractor wire is a key component of the switch functionality. Proper wiring is essential for correct operation and system diagnostics.
Trim Tab Operation in Varying Sea Conditions
The documentation provides guidance on trim tab operation in specific sea conditions, focusing on head seas. In a head sea—defined as waves or current running directly against the course of a boat—the documentation recommends lowering both tabs slightly by pressing the “BOW DOWN” function on both sides. This action brings the bow down while maintaining speed, allowing the hull to absorb the impact of the waves, resulting in a smoother and more efficient ride.
Corrosion Resistance and Maintenance
Maintaining corrosion resistance is a key consideration for marine environments. The documentation emphasizes the importance of keeping the surface of stainless steel components clean and free of contaminants. Lenco recommends using an acid and water solution to clean the trim tab blades, specifically mentioning MaryKate’s On & OFF product as a suitable choice.
Retrofit Kit Specifics
The Lenco RetroFit Kit is specifically designed for compatibility with Bennett trim tab systems. It serves as a direct replacement for the Bennett hydraulic power unit (HPU) in systems that use Bennett's 4-ring standard trim tab actuators. The instructions emphasize the importance of following the provided instructions and drawings carefully during the retrofit process.
Additional Notes
The documentation includes a note regarding sacrificial anodes for Lenco SS trim tabs, advising awareness of stray currents in marinas. The documentation also notes the importance of proper surface preparation for stainless steel components to maximize corrosion resistance.
Conclusion
The provided documentation outlines the installation process for Lenco trim tab systems, including retrofit options for existing Bennett systems. It details essential steps for mechanical installation, electrical connections, and operational procedures in specific sea conditions. Maintaining corrosion resistance through proper cleaning and awareness of environmental factors is also highlighted. The documentation stresses the importance of following instructions carefully to ensure optimal performance and longevity of the trim tab system.
Sources
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