Loading vehicle

A loading vehicle comprising:

• a vehicle body including a plurality of wheels;
• an engine mounted on the vehicle body;
• a variable displacement traveling hydraulic pump that is driven by the engine;
• a traveling hydraulic motor that is connected to the traveling hydraulic pump through a closed circuit and transmits drive force of the engine to the plurality of wheels;
• a working device that is mounted rotatably in a vertical direction with respect to the vehicle body;
• a loading hydraulic pump that is driven by the engine and supplies hydraulic oil to the working device;
• a discharge pressure sensor that detects discharge pressure of the loading hydraulic pump;
• an operation state sensor that detects an operation state of the engine;
• and
• a vehicle speed sensor configured to detect vehicle speed,
• wherein
• both the traveling hydraulic pump and the traveling hydraulic motor are electronically controlled,
• the loading vehicle further comprises:
• a controller configured to control the traveling hydraulic pump and the traveling hydraulic motor;
• and
• a solenoid proportional valve configured to generate control pressure for controlling displacement volume of the traveling hydraulic pump based on a control signal output from the controller, and
• the controller is configured to:
• store at least one predetermined characteristic table indicating correlation between discharge pressure of the loading hydraulic pump or an operation state of the engine and maximum discharge pressure of the traveling hydraulic pump;
• and
• in a case where the vehicle speed detected by the vehicle speed sensor is vehicle speed that corresponds to work requiring traction force, based on the discharge pressure detected by the discharge pressure sensor or the operation state of the engine detected by the operation state sensor, output a control signal to the solenoid proportional valve so as to obtain the maximum discharge pressure of the traveling hydraulic pump that corresponds to the at least one predetermined characteristic table.