Re: Power Trim
JD,<br />This may help...<br /><br />HYDRAULIC BLEEDING SYSTEM <br /><br />The trim/tilt unit with two small trim cylinders and one large tilt cylinder is almost a "self-bleeding" system. Actually, the "bleed" operation is accomplished through the fill screw. To check for air in the system, first activate the UP circuit and raise the outboard slightly with the trim cylinders. Next, exert a heavy, steady, downward force on the lower unit. If the trim rods retract into the trim cylinders more than 1/8" (3.2 mm) there is air in the system.<br />WARNING !!<br />TRIM SYSTEM IS PRESSURIZED! DO NOT REMOVE FILL SCREW UNLESS OUTBOARD UNIT IS IN CORRECT POSITION.<br />
If the trim/tilt pump and motor are installed in the boat, the outboard unit MUST be in the full down position.<br />If the trim/tilt pump and motor are installed between the clamp brackets, the outboard unit Must be in the full UP position.<br /><br />TIGHTEN FILL SCREW SECURELY BEFORE MOVING OUTBOARD.<br />Raise the outboard unit to the full UP position. All three pistons will be fully extended. Once the unit is in the full up position, release the button and engage the tilt lock lever. Now, momentarily depress the UP button just a couple times. De-pressing the UP button, for a second or two, will send current through the UP solenoid to the electric motor; the motor will drive the pump; air in the pump will cause it to "squeal"; the pump will draw fluid from the reservoir; the pump will attempt to send fluid to the tilt cylinder; the piston cannot move because it is already extended; the pressure will increase to 425 psi (2930 kPa); the port side pressure relief valve will automatically open; the excess fluid will be returned to the reservoir, purging the system of air. Actually, the air is returned to the reservoir. <br />At this time, SLOWLY remove the fill screw and the trapped air will escape. Add fluid, if necessary. Understand, a small amount of air will remain on top of the reservoir under the cap. This is caused by the design of the cap and reservoir and as a "cushion" for the system. Remove the tilt lock lever; depress the DOWN button; lower the outboard unit to the full down position. Now, momentarily depress the DOWN button for just a second or two, a couple of times. Depressing the DOWN button for a second or two will again activate the system; air in the pump will cause it to "squeal"; the pump will draw fluid from the reservoir; the pump will attempt to send fluid to the "down" side of the tilt cylinder; the cylinder cannot move because it is already retracted; the pressure will increase to 425 psi (2930 kPa); the pressure relief valve in the port side trim piston will automatically open; the excess fluid will be returned to the reservoir, purging the system of air. Actually, the air is returned to the reservoir.<br /><br />Raise the outboard to the full up position again. Engage the tilt lock lever. SLOWLY remove the fill screw again and the trapped air will escape. Add fluid, if necessary. Repeat the above procedure two or three times and any and all excess air will be bled from the system. After the air leaves the system, a noticeable change in the sound of the pump motor laboring with the outboard unit in the full up or down position will be heard.<br />As a further check, make the initial test for air again by first raising the outboard with the trim cylinders just a few degrees, and then exerting a steady downward pressure on the lower unit. If the trim rods do not retract into the cylinders more than about 1/8" (3.2 mm), all excess air has been bled from the system.<br /><br />Southern Catfisher
