PROBLEM TO BE SOLVED: To improve an operating feeling by a circular steering wheel by operating HST type continuously variable transmission mechanism for traveling by a main shift lever, and operating HST type continuously variable transmission mechanism for turning by the circular steering wheel. ;SOLUTION: A main shift lever 68, an operation control part, connected to HST type continuously variable transmission mechanism 25 for traveling, and a circular steering wheel 19 connected to HST type continuously variable transmission mechanism for turning are interlockingly connected to speed change and turning interlocking mechanism 69, a moving means. The interlocking mechanism 69 is interlockingly connected to a traveling speed change operating arm 151 and a turning neutral holding arm of traveling and steering HST type speed change mechanism 25 through traveling speed change and steering link mechanism 70, 71. The HST type continuously variable transmission mechanism 25 for traveling is operated by the main shift lever 68, and the HST type continuously variable transmission mechanism 28 for turning is operated by the circular steering wheel 19 so as to improve an operating feeling by the circular steering wheel.;COPYRIGHT: (C)1998,JPO
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