Patent ID: 8671673

Claim:
A travel control apparatus for working vehicle, comprising: a first circuit for traveling, formed through a closed circuit connection of a variable displacement hydraulic pump and a variable displacement hydraulic motor, that comprises a motor control unit that controls a displacement of the hydraulic motor; a second circuit for working that drives a work hydraulic actuator by pressure oil from a work hydraulic pump, the work hydraulic actuator comprising: an arm cylinder that drives an arm for supporting a bucket and has an arm operation pressure range in which a pressure in the second circuit varies during an arm operation and a maximum load pressure in the second circuit is set as a maximum pressure of the arm operation pressure range, and a bucket cylinder that drives the bucket and has a bucket operation pressure range in which a pressure in the second circuit varies during a bucket operation, the pressure in the second circuit being smaller than a pressure in the arm operation pressure range, and a pressure around a minimum pressure of the arm operation pressure range is set as a maximum pressure of the bucket operation pressure range; and a maximum value control unit that controls a maximum displacement of the hydraulic motor in accordance with load pressure in the second circuit, wherein: when a load pressure in the second circuit exceeds a first predetermined value that corresponds to the maximum pressure of the bucket operation pressure range, the maximum value control unit decreases the maximum displacement to a minimum limit corresponding to a maximum load pressure in the second circuit within a predetermined increment of the load pressure from the first predetermined value, the load pressure with the predetermined increment being smaller than the maximum load pressure in the second circuit.