| 摘要 |
PROBLEM TO BE SOLVED: To provide a working vehicle which enables very smooth changes. SOLUTION: This turning control unit is constructed such that the drive statuses of a pair of running gears at left and right, 1L and 1R, can be switched to a plurality of turning operating statuses with different turning forces by selectively changing the operation statuses of a plurality of hydraulically operated friction devices 45, 49, 50, respectively, to the operating status. The unit is provided with a turning tool which commands a turning operation status where the turning force becomes increasingly greater the further the tool is moved from the straight driving command position to the turning motion side. When the turning status is switched, the hydraulic operation force acting on either of the friction devices 45, 49, 50 that is being switched from the operating status to the non-operating status is gradually decreased. Further, the hydraulic operation force acting any friction device 45, 49, 50 that is being switched from the non-operating status to the operating status is gradually increased.
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