Installation Guide

Installation instruction for InstaTrim XP2 trim tabs



Installation of trim tab plates

Fix the trim tab plates with the enclosed stainless screws, as shown in figure , depending on the type of hull.

Use sealant under the screws.

(NOTE! Not silicone (RTF).) Fix the trim tabs as close to the sides of the hull as possible, but not closer than 100 mm (4″). If the boat has an AQ drive or outboard engine, the tabs must not be fitted closer than 230 mm (9″), to avoid cavitation.

The hinge must follow the hull as closely as possible, and must be installed 5 mm(0.2″) up from the base of the transom, so it does not interfere with the water flow under the hull. For speeds above 35 knots, this distance can be increased to 10–15 mm (0.4–0.6″). NOTE! No section may project below the line of the hull.

Hole drilling and installation on the transom.

Offer the cylinder anchorage up, in such a way that the trim tab is lifted up about 100 mm (4″) from the imaginary extension of the line of the bottom, using a straight-edge laid on the bottom and extending beneath the trim tab. The position which is now found is the so called base position, which is the point of departure for trimming the boat.

Standard: Mark out the hole patterns for the anchorages. Drill, then fix the anchorage with the enclosed stainless screws.

Mark out a hole for the hydraulic hose at least 150 mm (6″) above the waterline.

Drill a 13 mm (0.5″) hole obliquely upwards from the outside.

Chamfer the edges, to avoid damaging the hose. Installation of hydraulic hose: The hydraulic hose is delivered in one length, with a hydraulic cylinder installed at one end. Avoid undoing the hose from the cylinders, when it is factory installed. Measure the length of each hose, and cut.

NOTE! The hose must have at least 30mm (1.2″) extra movement margin on the outside of the transom, to accommodate the movement of the cylinders,

Pull the free hose ends from the outside, through the holes in the transom, to the hose nipples on the sides of the pump unit. The port hose must be connected to the nipple marked “Port”. Fix the hoses to the nipples with the enclosed hose clamps.

NOTE! Do not tighten too hard. Fix the hose cover over the upper part of the hose transition.

XP: The pre-drilled holes on the trim tab for the trim cylinder now determine where the hole for the cylinder neck should be drilled. Mark the hole pattern out, 80 mm (3.1″) further aft along the tab (80 mm (3.1″) = length of cylinder neck). Put the cylinder there and fold it down against the transom.

NOTE! Align the cylinder neck parallel with the trim tab in this position. Now mark the hole out on the transom.

IMPORTANT! In many boats, the transom is angled, so an assessment of the angle must be made for each installation. It is most common that the transom leans outwards. In this case, the marking on the transom will have to be raised, to allow for the rise due to the fact that the joint on the trim cylinder is 30 mm (1.2″) aft of the transom. Then drill the holes at right angles to the transom.

Installing the cylinder on the trim tabs

NOTE! XP: Drill the holes before the cylinders are installed on the trim tabs.

Put hex nuts in the corresponding holes in the anchorage, thread the bolts with their lock washers from underneath, and tighten hard with a screwdriver.

Trim tabs installation

Remove the chrome plated angled nipple from the cylinder neck. After careful measurement as above, drill a 27mm (1.1″) diameter hole for the threaded cylinder neck. Drill an 8 mm (0.3″) countersink to a depth of 8 mm (0.3″) for the short guide cone. Guide the sensor cable and cylinder neck into place, seal with sealant and tighten the plastic nut with water pump pliers.

(NOTE! Do not tighten too hard.) Carefully screw the angled hose nipples back into the cylinder necks. NOTE! Do not tighten too hard!) 

Installation of hydraulic pump

Position the pump vertically, as close to the cylinders as possible. Location can be varied as necessary, since the length of the hydraulic hose can vary from one cylinder to another. The pump must not come into contact with any bilge water. Fill up with oil to the level mark. Hose installation, XP trim tabs

The hydraulic hose is delivered in one length. Measure the lengths and cut them with a good margin, so the hoses can be installed in smooth bends. Connect to the nipples and lock with hose clamps. The port hose must be connected to the pump output marked “Port”. NOTE! Do not tighten the hose clamps too tight, to avoid oil leakage.

Electrical installation

(please refer to the wiring diagram)  

Connect the hose to the pump, using the five-pin connector. Connect the colored cables to the rear of the control switch, which is also colour coded.

NOTE! Always use the fuse (20 Amp) which accompanies the control switch. Red cable: (marked “positive line – direct to battery”) for best effect, connect this direct to the main switch. Black cable: Connect the black cable to boat ground or the negative pole on the battery. Make sure that the connection is clean, firmly tightened, and as short as possible.

Connecting the indication instrument/XP trim tabs.

Connect the sensor cables, as in figure 3, to the three-way connection which is fixed on/beside the pump

housing with its cover, using the stainless screws.

NOTE! Do not increase the hole diameter of the connector, since this could damage the electronics.

Connect the red/black cable to positive and negative respectively, on the ignition lock.

Starting the system

When installation is finished, run the trim tabs up and down a few times. Then stop in the upper position. Remove the plug on the oil reservoir to let the air out. Top up with oil to the level mark and put the plug back.


Surface treatment

We recommend that the cylinders and trim tabs should be painted with primer and anti-fouling paint to avoid growth of weed and barnacles on them.

NOTE! Do not paint the piston rods.

Installation Round Waterproof Switch

Installation Square Original Switch