Bennett Marine SST System User manual

Installation Instructions

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 and run towards the centerline of the boat.
Step 2
Attach the mounting plates and trim tab with ¼" stainless steel fasteners
along the bottom of the transom. (See Figure 1) Using the backing plate as a
template, mark screw hole locations. Assemble mounting plates and tab, 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. If the transom is curved and
transom mount style tabs are being installed, a shim must be made of a suit-
able material to provide a at mounting surface.
Step 3
Secure the lower hinge of each actuator to the tab with supplied machine
screws. Using a straightedge under the hull bottom, set the“negative
angle”of the tab’s trailing edge as shown. (See Figure 2)
Step 4
Remove hex plugs from the upper mounts of the actuators.
With tabs set at negative angle, position the upper mounts
against the transom. Slide the actuator template behind upper
mount, align and tape to transom drill holes accurately as
indicated on templates. Drilling a small pilot hole rst helps you
locate accurate centers.
Step 5
Apply Teon tape on male threads of pipe nipples and tighten
into the actuator upper mounts. Use care to avoid cross
threading and do not over tighten (Turn in nipple nger
tight, then two full turns with vise grips, NO MORE).
Apply waterproof sealant on surface around pipe nipples and
screw holes. Insert pipe nipples through transom and secure
actuator upper mounts to transom with 5/16" fasteners.
Note: cover the ends of the pipe nipples with masking
tape to prevent dirt
or debris from
entering the
system. Remove
masking tape
before making
connections
inside the
vessel.
Figure 1
9/32" Mounting Holes for
1/4" Fasteners
Figure 2
Figure 3

Step 6
Install Hydraulic Power Unit (HPU) in a convenient location with
a dry environment. Important: The HPU must be mounted
in a dry enough location to avoid submersion and
drenching. Allow space above the HPU so that it may be slid
into its mounting bracket (about 3"). Lay out upper holes on
HPU mounting bracket 4 5/8" apart and start #10 x 1" screws
using 5/32" pilot holes.Then drill 5/32" pilot holes for lower
screws and mounting bracket. Slide HPU into bracket.
Step 7
Inside the transom, apply Teon tape on male threads of pipe
nipples and tighten 90 degree brass elbows to pipe nipples.
While tightening elbow, hold pipe nipple with vise grips
to prevent stripping.
Step 8
Run hydraulic tubing from actuators at transom to HPU
(See Figure 4) and cut to length. Note: Make port and
starboard lengths as equal as possible.
Step 9
Insert tubing through the nut with ferrule at 90 degree elbow. Push until it bottoms in
the tting. While continuing to bottom the tubing in the tting, tighten nut“nger
tight”, then one full turn with a 1/2" wrench . . . NO MORE.
Step 10
To connect tubing to Hydraulic Power Units, insert tubing through the nut with
ferrule tting and push into the pump-face tting until it bottoms.While continuing
to bottom the tubing in the tting, tighten nut“nger tight”, then one full turn with a
1/2" wrench … no more. Use tube bending clips at desired 90 degree bends in tubing to prevent kinking.
Step 11
Connect HPU ground wire to the the vessel’s negative ground system.
Step 12
Wire control and electrical system per separate instruction sheet.
Step 13
Remove plug from ller stack located at the front left corner of the reservoir. Fill reservoir to“Full Line”using any type
automatic transmission uid (ATF).
Step 14
Using the control, hold the“Bow Down”position for 15 seconds, then“Bow Up”for 15-20 seconds. Repeat 3 times.
This will purge air from the system.
Step 15
Place both tabs in the“full down”position and check all hydraulic connections for leaks. Bring the tabs to the full up position
and check uid level. Add ATF if necessary.
Figure 4
Tighten Nut with 1/2"Wrench One FullTurn Past Finger
Tight - NO MORE
PushTubing to Bottom of Fitting While Tightening

Bennett Marine
550 Jim Moran Boulevard
Deereld Beach, Florida 33442
USA
Phone: [phone]
Fax: [phone]
IMPORTANT: FOR BOATS KEPT IN SALTWATER
To provide protection from electrolytic corrosion a zinc anode must be applied to each Tab or, in the case of Tabs
installed on the boat as original equipment by the builder, a bonding system may be utilized for your particular
model. For the SST system the top portion of the Actuator and the Actuator Shaft are electrically isolated. Therefore
the Trim Plane and the upper part of the Actuator must be individually protected or integrated into a bonding system.
Trim Tabs and Actuators may be painted with anti-fouling paint to prevent fouling by marine growth.
Follow paint manufacturer’s recommendations for proper priming and painting of 304 stainless steel.
Note: Do not paint under zincs in order to achieve maximum electrical contact to trim tabs.