TRIM TAB INSTALLATION INSTRUCTIONS
READ INSTRUCTIONS COMPLETELY BEFORE BEGINNING INSTALLATION
Materials/Tools: |
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Vise Grips |
Automatic Transmission Fluid |
Wire Cutters |
Wire Stripper |
Electric Drill |
Small Funnel |
7/64", 9/64", 3/32", 3/16", 5/32" & 1/2" Drill Bits |
Masking Tape |
2 1/2" Hole Saw for Euro-Style Rocker |
1/2" & 9/16" Wrenches |
Marine Epoxy |
Switch Control |
Tape Measure |
#1, 2 & 3 Phillips Head Screw Drivers |
Marine Grade Sealant |
Teflon Tape |
4-ft. Straight Edge |
Wire Crimpers |
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 ½/2", and 12" chord tabs should have a negative angle of 5/8".
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