Transportation vehicle

A transportation vehicle including a vehicle body frame and a vessel provided on the vehicle body frame so as to be capable of rising and falling, the transportation vehicle comprising:

• a tank that stores a fluid to be cooled;
• a heat exchanger that cools the fluid to be cooled;
• a pump that circulates the fluid to be cooled between the tank and the heat exchanger;
• a temperature sensor that detects a temperature of the fluid to be cooled;
• a fan that blows air to the heat exchanger;
• a hydraulic motor that drives the fan;
• and
• a controller that controls the pump and the hydraulic motor according to the temperature detected by the temperature sensor, wherein
• the controller
• stores a first pump rotation speed, a first temperature associated with the first pump rotation speed, a second pump rotation speed higher than the first pump rotation speed, a second temperature associated with the second pump rotation speed, a first motor rotation speed, a third temperature associated with the first motor rotation speed, a second motor rotation speed higher than the first motor rotation speed, and a fourth temperature associated with the second motor rotation speed,
• is configured to raise a rotation speed of the pump from the first pump rotation speed to the second pump rotation speed according to a rise in the detected temperature when the detected temperature is between the first temperature and the second temperature, and
• raise a rotation speed of the hydraulic motor from the first motor rotation speed to the second motor rotation speed according to a rise in the detected temperature when the detected temperature is between the third temperature and the fourth temperature, and
• the third temperature is set higher than the first temperature, and the controller is configured to start the rotation speed of the pump to be raised from the first pump rotation speed when the detected temperature reaches the first temperature from a temperature lower than the first temperature, raise the rotation speed of the pump from the first pump rotation speed without raising the rotation speed of the hydraulic motor until the third temperature is reached when the detected temperature rises beyond the first temperature, and start the rotation speed of the hydraulic motor to be raised from the first motor rotation speed when the detected temperature reaches the third temperature.