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Electric RetroFit Kit for Bennett Trim Tabs
Installation Instructions
Lenco Marine's RetroFit Kit is designed as a direct replacement for the Bennett hydraulic
power unit (HPU) on systems using Bennett's 4-ring standard trim tab actuators.
Note: Bennett Joystick Control cannot be retrofitted to the Lenco actuators, but will r
both Bennett rocker switches. You may also want to consider replacing your Trim Tab switch
at this time. Please visit our website (www.lencomarine.com) for a list of available Lenco
switch kits.
Make sure the power is removed from the Bennett Trim Tab System before
installation.
Disconnect Bennett System
1) Disconnect the Bennett hydraulic pump
unit (HPU) from the Bennett wiring harness
and drain as much of the hydraulic fluid as
possible into a container for proper disposal
later. Remember that automatic transmission
fluid (ATF) is to be disposed of only at an
approved collection site in your area; do not
discard in the regular trash. Discard hydraulic
pump unit (HPU). Leave Bennett wiring
harness in place.
2) Remove and discard the Bennett trim tab
cylinders from the boat transom and remove
the hydraulic line at the connection. It helps
to have several rags handy to soak up the
oil. Remove and discard old hydraulic lines.
Disconnect the Bennett cylinder from the
trim tab plane by tapping out the small black
pin at the base of the cylinder where it
attaches to the plane. You will first have to
remove one screw from the lower mounting
bracket as this holds the pin in place. Do
not remove the lower mounting bracket,
as you will need it later.
Now you are ready to begin the Lenco
Installation
1) Insert the actuator cable through the
appropriate hole in the upper mounting
bracket (supplied with the kit) until it reaches
the actuator. Insert the actuator cable thru
the gland seal until it reaches the upper
mounting bracket.
Note: For appropriate orientation of upper
mounting bracket and gland seal, (see Fig 1).
Fig⸠1
Upper Mounting
#14 x 1-1/4”
SS Screws
Gland Seal
Bracket
Side View
Caulk as per
Instructions
You will need to clean the mounting surfaces on
the transom with a cleaning solvent such as mineral
spirits or alcohol to remove all oils and dirt before
final mounting. Insert the actuator cable through
the transom. With the actuator loosely supported,
bed the upper mounting bracket and screws with
a marine adhesive sealant for use below the
waterline. Start the provided #14 x 1-1/4" (3.17 cm)
stainless steel sheet metal screws through the upper
mounting bracket and into the transom.
MAKE SURE TO LEAVE THE SCREWS ONLY
PARTIALLY INSTALLED.
Insert the actuator clevis (mounting ear) into the
upper mounting bracket and hold in the approx.
installed location. Pass the actuator cable through
the transom removing slack on the cable until it
looks like the installation in Fig 2. Remove
the actuator from the upper mounting bracket and
finish installing the previously started #14 x 1-1/4"
(3.17 cm) stainless steel sheet metal screws through
the upper mounting bracket and into the transom.
We recommend using a marine adhesive sealant for
use below the waterline to bed the upper mounting
bracket and screws. DO NOT OVERTIGHTEN. Also
bed the screws and cable inside the transom area.
Attach the actuator to the upper mounting bracket
using the bolt and nut provided.
Fig⸠2
2) You are now ready to attach the Lenco Actuator
to the blade. First insert the 1-1/4" Delrin Pin part
way through the hole in the Bennett lower mounting
bracket and insert through one of the four black
washers provided in the kit. Place the actuator into
the bracket and tap the pin through. Continue
through the second washer and other side of the
bracket. Replace the bracket screw. This will lock the
pin in place and prevent it from falling out.
etrofit
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Electric RetroFit Kit for Bennett Trim Tabs
Installation Instructions Continued
3) Now you will need to hook up the Lenco
Actuator wires inside the bilge/rigging area.
First cut the wire connector from the Bennett
wire harness where the pump used to be.
Strip the four harness wires, cut the pins on
the four Lenco actuator wires, and strip these
four wires. Connect these wires as per the
diagram below, using the heat shrink butt
splices provided in the kit. Make sure to use
the proper crimping tool and then heat all
connections for a tight waterproof seal.
Tie-wrap or secure in some fashion to a dry
location to help prevent the connectors from
getting too wet.
Wiring Instructions For Connecting Lenco
Actuator Wires to Existing Bennett Rocker
Switch
1) Disconnect all wires from the Bennett
rocker switch. Remove and discard all brass
strips. Reconnect the four wires from the
existing Bennett wire harness to the back of
the Bennett switch as per the diagram below.
2) Now find a 12 volt negative at the helm/
console.
Connect this to the 3’ black jumper wire with the nonterminated end. Attach to screw terminal on the back
of the Bennett switch as per the diagram below (-12
Volt Black). Attach the orange, black, yellow, red,
green, and blue short jumper wires to the back of
the Bennett switch as per the diagram below. The
12 volt positive (+) should already be at the switch
from the previous system. Simply reconnect it as
per the diagram below.
3) Test the trim tabs for proper operation.
Remember
that the right switch controls the left trim tab and
the left controls the right. Bow down should extend
the tabs while bow up should retract them. If for
some reason this does not work as described in the
above text then recheck all the wiring for a misplaced
wire. If still not fully operational refer to the trim tab
trouble shooting guide in the owners manual for
further instructions.
Port
Wiring Diagram for Bennett Rocker Switch
White Red
Starboard
Black
White
Black
Cut quick disconnect
at pump and connect
to Lenco actuator wires
Top (Bow Down)
+ 12V
Orange
Blue
Green
Yellow
Existing Bennett
wire harness
- 12V
Black
Bottom (Bow Up)
For further assistance please visit our website at www.lencomarine.com
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