(57) [summary] (modified with) Purpose: the engine speed is as clutch for the hydraulic pump drive and does not rise above the crane work possible rotational speed does not connect me to prevent the engine stop. [Configuration] via the clutch 3 to the hydraulic pump 1 with an electric signal is dead band operation is to be driven by the engine for vehicle travel, the operation is engine speed control means and the crane working engine speed from idling speed possible to provide a switching means 8 which operates by detecting the engine speed when it is raised to the rotational speed is interposed in the operation the electric circuit 7 of the clutch, contact of the clutch by the switch means is actuated and the clutch operating switch If it is selected, It was configured such that the clutch is connected.
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