Suzuki 2003-2007 DF60 DF70 Outboard Motors Service Manual, Page 236Get this manual
POWER TRIM AND TILT
PRINCIPLES OF OPERATION
TRIMTILT "UP"CIRCUIT When the PTT switch is operated "UP" position, the electric motor and gear pump will operation on clockwise directionPressurized oil will open check valve A, oil will flow from reservoir to spool valve via pump and spool valve BThe spool valve will down, then "DOWN" pressure main check valve will openOil in the upper chamber will return to pump via 2-way valve, and then oil pressure will rise and open "UP" pressure main check valve 2, then oil will flow to lower cylinder chamber of cylinderIt makes the piston rod push up and the engine tilt upTo keep oil level, oil flows from reservoir to pump through the check valve AOil through the "DOWN" pressure main check valve and returns to pumpWhen 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 "UP" position is attained, sustained operation of the "UP" relay will have no effect, as pump oil flow will be returned to the reservoir through the "UP" relief valve 3