ENGINE CONTROL DEVICE FOR TRACTOR

In structure of an engine control device for a tractor, when a standard engine performance curve N is selected by a mode selection device 134, and a PTO drive device 151, which drives an implement attached to a tractor, is turned on, switching to the engine speed maintenance control mode B is performed. Further, when a fuel efficient engine performance curve S is selected by the mode selection device 134, and the PTO drive device 151, which drives the implement, is turned on, switching to the engine speed change control mode A is performed. The problem that an engine stall tends to occur when control for maintaining the engine speed is performed while the fuel efficient engine performance curve with lower consumption rate than normal consumption rate is selected can be solved.