Suzuki 2003-2007 DF60 DF70 Outboard Motors Service Manual, Page 237Get this manual
POWER TRIM AND TILT
TRIMTILT "DOWN" CIRCUIT When the PTT switch is operated "DOWN" position, the electric motor and gear pump will operation on counterclockwise directionCheck valve will open; oil will flow from reservoir to spool valve AIt makes spool valve move to downward, then "UP" pressure main check valve openOil in the lower chamber will return to pump, and then oil pressure will rise and open "DOWN" pressure main check valve 1, then oil will flow to upper cylinder chamber of cylinderIt makes the piston rod push down and the engine will tilt downTo keep oil level, oil flows from reservoir to pump through the check valve BSurplus oil in the pump through the "DOWN" relief valve and returns to reservoirWhen trim motor stops, both the "DOWN" pressure main check valve and the "UP" pressure main check valve will close to retain tilttrim positionIn the trim area, trim piston and floating tube are moving with piston rodWhen full trimtilt "DOWN" position is attained, sustained operation of the "DOWN" relay will have no effect, as pump oil flow will be returned to the reservoir through the "DOWN" relief valve 3