| 摘要 |
PROBLEM TO BE SOLVED: To enhance operability and reliability. SOLUTION: This steering operation device is provided with right and left side clutches for independently connecting/disconnecting transmission to right and left traveling devices; a clutch for reducing a speed of the traveling device at a side where the side clutch is disconnected and a brake for braking it; a steering interlocking mechanism Z1 for switching a steering direction control valve for operating the side clutch accompanying with a rotation of a rotary cam 114 operated by an electric motor; a mode switching interlocking mechanism Z2 positioned at the first state that a pressure oil is fed to the clutch without receiving a pressing operation when the rotary cam 114 is rotated and positioned between set positions, pressed and operated to be switched to the second state that the turning mode selection valve is switched to the state that the pressure oil is fed to a brake when the rotary cam 114 exceeds the set positions and is rotated, pressed and operated to be switched to the first state when the rotary cam 114 is returned and rotated to a neutral position.
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