TRANSMISSION SYSTEM

摘要

A series of multifunction controls are provided to operate a hydrostatic automatic transmission and subtransmission wherein one of running ranges is switched to another by a sub-transmission lever. An automatic speed change mode is switched to or from a stepping speed change mode by a mode map switch, and when the stepping speed change mode is selected, manual speed change is performed by a shift switch. The shift switch and the mode map switch are configured as a common switch. The common switch is used as the shift switch during running of the vehicle, and the shift switch is changed into the mode map switch when the shift switch 28 is depressed only under the condition that the vehicle is stopped and the running range selected by the sub-transmission is located at the neutral (N) or that the vehicle is stopped and the brake switch is turned on. When the shift switch is depressed, the function of the shift switch is changed into the function of the mode map switch, and the speed change mode is switched by one stage each time the mode map switch is depressed. This control arrangement is cost effective and convenient to us.