Honda BF35A-BF45A Outboard Motors Shop Manual., Page 224Get this manual
Construction and operation Power trimtilt type
UPIDOWN relief: Operates protect the circuit and the outboard when it is caught with the obstacles during the full tilt upldown or during operationLeft side: Down relief valve Right side: Up relief valve
Pump: Supplies oil the UP side when rotating in normal direction, and the DOWN side when rotating in reverse direction
Shock valve: Operates release the oil between the piston and free piston and absorbs the impact when the outboard collides with the obstacles in
Spool valve: Moves right or and switches the oil flow according to the rotating direction of the pump