PROBLEM TO BE SOLVED: To reduce a power loss at straight advancing time, by disconnecting a first clutch at the straight advancing time, so as to prevent a turning HST type transmission from operating. ;SOLUTION: In this constitution, power from an engine is transmitted to an input shaft 14 of a running HST type transmission 13, from the input shaft 14 to an input shaft 56 of a turning HST type transmission 17 through a first clutch 53, and when a steering handle 30 is turn operated or manually operated, the first clutch 53 is operated, and when a switch is operated, which is associated to be connected to a steering output pulley 73 through a second clutch 59 from the input shaft 14 to be arranged in the vicinity of a driver's seat, the second clutch 59 is operated.;COPYRIGHT: (C)1998,JPO
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