| 摘要 |
PROBLEM TO BE SOLVED: To safely control the position of working machine especially on the levee side while preventing the generation of accident as a cause of an unexpected collision by operating an engine speed lowering mechanism with a change of an attitude of the working machine from a ground working attitude to a rising attitude or the operation for the reverse movement of a machine body. SOLUTION: When a handle operating angle exceeds a fixed value in the case of operating a tractor, a control unit 50 carries on the engine speed control at the time of turning. Namely, when three conditions that an acceleration level switch 92 and a turn changeover switch 93 are turned on together and an auxiliary transmission switch 94 is not set at a high speed are satisfied, a working machine is raised by a hydraulic cylinder with the raising operation of an elevation operating lever is a working machine raising mode. At the same time, an engine speed down flag is set, and a turn relay output request is set so that a control motor 70 for controlling the engine speed outputs the engine lowering signal. With this structure, generation of accident such as a collision of a tractor with the levee side due to an unexpected quick start can be prevented.
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