Bennett Marine Standard Trim Tab Kits with Control Installation Instructions User Manual

Trim tab installation instructions

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TRIM TAB INSTALLATION INSTRUCTIONS

READ INSTRUCTIONS COMPLETELY BEFORE BEGINNING INSTALLATION

Vise Grips

Wire Stripper

7/64", 9/64", 3/32", 3/16", 5/32" & 1/2" Drill Bits

1/2" & 9/16" Wrenches

Tape Measure

Teflon Tape

Automatic Transmission Fluid

Electric Drill

Masking Tape

Marine Epoxy

#1, 2 & 3 Phillips Head Screw Drivers

4-ft. Straight Edge

Wire Cutters

Small Funnel

2 1/2" Hole Saw for Euro-Style Rocker

Switch Control

Marine Grade Sealant
Wire Crimpers

Materials/Tools:

Step 1

Position the trim tabs against the

transom and check to see that the upper mounts
of the hydraulic actuators do not center on an
inside obstruction. If they do, reposition tabs
slightly outboard. The further outboard the tabs
are mounted, the greater the lateral (side-to-side)
control. Position tabs 3" to 4" from the chine (side
of boat) and run towards the centerline of the boat.
Boats with outboard motors or inboard/outboards
(I/Os) must maintain a minimum of 8" from the
centerline of outboard or stern drive unit to the
closest edge of the trim tabs. Boats with inboard
motors may utilize the entire run of the transom.

(See Figures 1 & 2)

Note: If the inside of the transom is inaccessible due to fuel tank, floatation, or other obstruction,

call Bennett Marine for alternate installation options at (954) 427-1400.

Step 2

Attach the mounting plates and trim tab with #10 x 1-¼” stainless steel screws along the bottom of the

transom.

(See Figure 3)

Using the backing plate as a template, mark screw hole locations. Drill 9/64" pilot holes for mounting

screws and test. If the pilot holes are too tight, enlarge with a 5/32" drill bit. Assemble backing plates and hinge plates, dip screws in
marine epoxy before running in. Slide trim tab between backing plate and hinge plate before running screws tight. Snug screws
down to secure mounting plates and trim tab to transom. Aluminum boats should use machine screws and nuts (not included)
instead of the enclosed #10 x 1-¼" self-tapping stainless steel screws. If the tabs are bottom mount style, the one piece mounting
plate is secured to the bottom of the boat with the hinge curl touching the transom and with an equal space at each end of the
curl

(See Figure 4)

. If the transom is curved and transom mount style tabs are being installed, a shim must be made of a suitable

material to provide a flat mounting surface.

(See Figure 5)

Step 3

Secure the lower hinge of each actuator to the tab with 1/4-20 x ¾" Phillips head machine screws. Using a straight edge

under the hull bottom, set the “negative angle” of the tab’s trailing edge

(See Figure 6)

. 9" chord tabs should have a negative

angle of 1/2", and 12" chord tabs should have a negative angle of 5/8".

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