PROBLEM TO BE SOLVED: To provide a crawler traveling vehicle steering-operated by two steering levers, without generation of a gear shift shock to prevent operation error of the steering lever.;SOLUTION: A detection means 18L and a detection means 18R are connected in series between a power source + and an input terminal TD13 of a controller, a sub gear shift switch 23 is connected to an input terminal TB8 of the controller, the power source + and an output terminal A4 of the controller are connected with a driver unit 32, the driver unit 32 and the power source + are connected with a driver relay 33, and the power source + is connected with a high-speed valve 35 for switching output of a multistage transmission through the driver relay 33. When the steering lever is present in a neutral position, input is performed to the input terminal TD13 through the detection means 18L, 18R. When operation of the sub gear shift switch 23 is operated in that state, an operation signal of the sub gear shift switch 23 is inputted to the input terminal TF8 of the controller, and a switching signal is inputted to an input 1 of the driver unit 32 from the output terminal A4 of the controller to conduct electricity to the high-speed valve 35.;COPYRIGHT: (C)2006,JPO&NCIPI
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