| 摘要 |
A locking lever is enabled to lock a drive control system of a working implement in an undrivable state, even if it does not reach a locking stroke end. The locking lever is extended into a state to obstruct the passage into the passageway to a driver's seat thereby to switch a control selector lever of the working implement drive control system into a controllable position through a mechanical linkage. When the driver gets off from the driver's seat, the locking lever is returned from the passage obstructing position to a retracted position thereby to switch the control selector lever to an uncontrollable position through a the mechanical linkage. These operations are switched midway of the rocking stroke of the locking lever by bringing the control selector lever to the stroke end so that the locking lever is made idle to the stroke end of the retracted position while retaining the control selector lever in the switched state.
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