Abstract: To provide an engine revolutions control device of a working vehicle that the braking effect can be obtained by the low-speed speed gear as expected by the operator at the time of forward/reverse changeover and the durability of the clutch can be enhanced without increasing the capacity of the clutch. When the low-speed gear change range suitable for the work is selected by the shift range lever and the speed gear clutch corresponding to the maximum speed gear of the selected gear change range in the individual speed gear clutches is engaged, the throttle amount upper limit value which limits the revolutions of the engine so to have the upper limit vehicle speed or less corresponding to the maximum speed gear is determined, and it is output as a throttle amount correction command signal to an engine controller.

Abstract: An engine of a working vehicle in which an adverse effect of oil temperature rise is avoided, by decreasing a load applied to an accelerator when the working vehicle moves while lifting a boom and approaches a place where the load in a bucket is to be dumped during dump approach and, reducing heat generated through operation of a brake, and deterioration in work efficiency of the working vehicle is avoided by preventing the lifting speed of a boom from decreasing. A hydraulic pump controller and a method for controlling the hydraulic pump are also provided.

Abstract: To provide an engine revolutions control device of a working vehicle that the braking effect can be obtained by the low-speed speed gear as expected by the operator at the time of forward/reverse changeover and the durability of the clutch can be enhanced without increasing the capacity of the clutch. When the low-speed gear change range suitable for the work is selected by the shift range lever and the speed gear clutch corresponding to the maximum speed gear of the selected gear change range in the individual speed gear clutches is engaged, the throttle amount upper limit value which limits the revolutions of the engine so to have the upper limit vehicle speed or less corresponding to the maximum speed gear is determined, and it is output as a throttle amount correction command signal to an engine controller.

Abstract: An engine of a working vehicle in which an adverse effect of oil temperature rise is avoided, by decreasing a load applied to an accelerator when the working vehicle moves while lifting a boom and approaches a place where the load in a bucket is to be dumped during dump approach and, reducing heat generated through operation of a brake, and deterioration in work efficiency of the working vehicle is avoided by preventing the lifting speed of a boom from decreasing. A hydraulic pump controller and a method for controlling the hydraulic pump are also provided.