SPEED CHANGE GEAR

PURPOSE:To enable setting of a neutral position hydraulically and keeping of a speed change shift position without any change even after releasing of hydraulic pressure once the shifting is completed hydraulically, by providing a cylinder chamber in a shift actuator for neutral positioning. CONSTITUTION:When a shift lever is at a neutral position, a solenoid valve 53 is inputted with a signal and closes, thereby causing pressurized oil C to push pistons 32 and 33 downward. Consequently, pressurized oil C entering a valve 30 flows into a cylinder chamber 88 and pushes a piston 85 to the left side. In this case, the inside of the cylinder chamber 88 is highly pressurized and the piston 85 comes in contact with a switch, thereby notifying the completion of shifting to an electronic control device. Then, a regulator valve 111 returns to an operation position and the inside of a passage 120 is exposed to low pressure via a piston 113. A shift position can be kept without any change, even if the cylinder chamber 88 is purged of pressurized oil C.