Patent ID: 8146723

Claim:
A hydraulic control apparatus for marine reversing gear assembly for watercraft, comprising: a pressure reducing valve for adjusting the pressure of a working oil supplied from a working oil supply pump, and supplying the working oil to forward and reverse clutches; a proportional electromagnetic valve for controlling the supply of the working oil to a pilot chamber of the pressure reducing valve; and a pressure-controlled spring-type switching valve for switching to a circuit for supplying the working oil to a control piston chamber for controlling a set spring force of the pressure reducing valve, or to a circuit for draining the working oil from the control piston chamber; wherein a pressure output of the working oil supplied from the proportional electromagnetic valve acts upon the switching valve as a pilot pressure; and when the pilot pressure falls below a predetermined value, the switching valve switches to the circuit for supplying the working oil to the control piston chamber via the spring of the switching valve, and fully opens the pressure reducing valve.