| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a problem that a trouble occurs, when a tractor provided with various kinds of work devices is operated in a state that the function of a tilling depth-setting device does not act, because the tractor does not require the tilling depth-setting device disposed as a standard device in the case of some works and because the tilling depth-setting device is a device related to the lifting or lowering of a work machine. SOLUTION: A lift arm sensor 26 for detecting the height of the work device from the vehicle body, a tilling depth sensor for detecting the ground height of the work device, a dial type operation member, and a sensor 27 for detecting the rotation operation position of the dial type operation member are disposed in the tractor in which a work device is liftably connected to the rear portion of a vehicle body. The signal of the dial type operation member is switched into a tilling depth control or into a position control in response to the connection state of the tilling depth sensor for detecting the ground height.
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