Suzuki outboard motors 1988 2003 repair manual., Page 329Get this manual
TRIM AND TILT 9-3 ma check vawhi TIOVIPC the spool a he 10 oper the ocwn pressure main check a ve a1pressLre then flows nme LP pressure main check valve and outlet tube to the down side of thetilt cylinderOil pressure raises the piston in the cylinder forcing oil from the up side of the cylinder to return to the valve body through the outlet tube, the down pressure main check valve and the spool valve chamberBecause of the difference in volume between the up and down side of the cylinder, the down throttling check valve opens to add oil from the reservoir to allow complete upward strokeWhen the tilt cylinder reaches full stroke and the up tilt operation is continued, oil flow from the pump will return to the reservoir through the up blow valveWhen the down portion of the tilt switch is depressed, the tilt motor works in counterclockwise directionPump hydraulic pressure then opens the down pressure main check valve while moving the spool valve to open the down pressure main check valveOil at pump pressure then flows through the down pressure main check valve and outlet tube to the up side of the tilt cylinderOil pressure lowers the piston in the cylinder forcing oil from the down side of the cylinder to return to the valve body through the inlet tube, the up pressure main check valve and the spool valve chamberWhen the tilt cylinder reaches full down position and down tilt operation is continued, oil flow from the pump will return to the reservoir through the down throttling valveIn the event the outboard lower unit should strike an underwater object while the boat is underway, sudden high impact pressure is created in the up side of the tilt cylinderThis pressure opens the shock absorber valve in the tilt cylinder piston allowing oil to transfer to the down side of the piston and opens the down check valve allowing oil to return to the reservoirThe opening of these valves enable the tilt rod to extendA manual relief valve allows easy manual tilt of the outboard should electric power be lostThe valve opens when the screw is turned counterclockwise, allowing fluid to flow through the manual valveWhen the relief valve screw is turn fully clockwise, the manual valve closed and the outboard locked in position See Figure 3