BENNETT MARINE NMEA1 Trim Tab System Instruction Manual
- June 1, 2024
- Bennett Marine
Table of Contents
NMEA1 INSTALLATION INSTRUCTIONS
READ INSTRUCTIONS COMPLETELY BEFORE BEGINNING INSTALLATION
NMEA1 Trim Tab System
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IF ACTUATOR STROKE IS LESS THAN 1″ OR MORE THAN 2-1/2″, OR IF LESS THAN 1″ OF PISTON SHAFT IS EXPOSED WHEN THE ACTUATOR IS FULLY RETRACTED, HAS EXTERNAL HYDRAULIC CONNECTION, OR THREE RINGS MOLDED
ON CYLINDER BODY (SEE FIGURE 1), SPECIAL SENSOR COILS ARE REQUIRED. (CONTACT BENNETT MARINE) -
MAKE ALL ELECTRICAL CONNECTIONS WITH POWER OFF
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TEST SYSTEM BEFORE PUTTING THE BOAT BACK IN THE WATER
Tools required:
1/2″ & 7/16” Wrench
5/16″ Drill Bit| Teflon Tape
Wire Stripper
Electric Drill| Marine Grade Sealant
Vise Grips
Wire Cutter
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Installing New Upper Hinge with Sensor
Step 1 Inside transom, with tabs in full up position, locate trim tab hydraulic line and detach tubing from brass elbow (some fluid will drip out). While holding pipe nipples with vise grips, unscrew brass elbow. Do this procedure for port and starboard cylinders (see figure 2). If there is no pipe nipple visible inside the transom, you have a short fitting connection (see figure 3), skip to step 2.
Step 2 Outside transom, snap white plastic clip on shaft protruding from
bottom of cylinder. Grasp cylinder body with both hands and unscrew
counterclockwise from cylinder upper hinge (a small amount of fluid will
spill).
Step 3 Insert metal rod into piston, POINTED END DOWN.
Make sure that the O-ring is in place in new upper hinge with sensor coil.
Screw new upper hinge onto cylinder while keeping metal rod inserted into
center of sensor coil. Red cable for port side and green cable for starboard
side. Tighten upper hinge hand tight. IMPORTANT: Use care when handling
sensor coils during assembly to avoid damaging wires.
Step 4 Remove upper hinge from transom and remove pipe nipple. If you have
a short fitting use a 7/16” wrench to remove it from the upper hinge.
Step 5 Remove plastic clip from piston and repeat steps 2 – 4 for the
starboard cylinder.
Step 6 Using template, drill 5/16″ hole in transom for the sensor cable.
Screw pipe nipple into new actuator upper hinge. Tighten nipple hand tight.
Then, with vise grips, tighten two full turns . . . NO MORE. If you have the
short fitting, using a ½” wrench screw it in until the fitting is snug, the
shoulder of the fitting will just touch the plastic of the upper hinge.
Step 7 Cover end of pipe nipple with masking tape.
Apply sealant to actuator upper hinge surface around pipe nipple, screw holes,
and cable. Feed actuator cable through 5/16″ hole and secure actuator upper
hinge to transom with mounting screws. Grasp cylinder body with both hands and
tighten (clockwise) securely. Repeat for other side. Run cables to helm.
Step 8 Inside transom, remove masking tape from pipe nipples. Carefully
wrap Teflon tape around male threads of pipe nipples. Holding pipe nipples
with vise grips (to prevent them from turning) re-secure 90 degree elbows. Re-
attach hydraulic tubing, tightening nut finger tight. Snug nut with 1/2″
wrench. Do not over-tighten. Note: If you have the short fittings omit this
step.
Wiring NMEA1 to NMEA2000 Backbone
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Using red butt connectors, splice the red and green wires from sensors to the red and green wires from the NMEA1 module. Note either red and green wires from the sensor may be spliced to either red or green wire from the NMEA1 module.
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Run the connection cable from the NMEA1 Module to the Backbone cable of your NMEA2000 system.
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Connect the cable into the Backbone using a red Device Net “T” (not included).
You will need to purchase this “T” or buy an adapter to fit your current NMEA2000 system. Please contact your electronics manufacturer.
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Make sure the Backbone system has the correct terminator in place.
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Your NMEA1 Trim Tab position sensor is now installed. Refer to the Lowrance, or other electronics manufacturer’s instructions for calibration of the system.
For product support, please call
1-866-894-1626 (Option #3), or email
[email protected].
Bennett Marine is a Division of Yamaha Marne Systems Company, Inc. – Learn
more at BennettTrimTabs.com