2B-4 Power Trim and Tilt:
Trim / Tilt Down Circuit
• When the PTT switch is operated in the “DOWN” position, the electric motor will rotate in a counterclockwise
direction and turn the gear pump.
• Check valve (1) will open; oil will flow from the reservoir to the spool valve (2).
This makes spool valve (3) move to downward, and causes the “UP” pressure main check valve (4) to open.
• Oil in the lower chamber will return to pump, and then oil pressure increase will open the “DOWN” pressure main
check valve (5), allowing oil flow to the upper chamber of cylinder.
This makes the piston rod push down and the engine will tilt down.
• Oil flows from the reservoir to the pump through check valve (1).
Surplus oil in the pump flows through the “DOWN” relief valve (6) and returns to the reservoir.
• When the trim motor stops, both the “DOWN” pressure main check valve (5) and the “UP” pressure main check
valve (4) will close to retain tilt/trim position.
• In the trim area, the trim piston and floating tube are moving with the piston rod.
• When full trim/tilt down position is attained, sustained operation of the “DOWN” relay will cause oil to be returned to
the reservoir through the “DOWN” relief valve (6).
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