Hauling Vehicle

A hauling vehicle comprising:

• a hydraulic fluid tank for storing hydraulic fluid,
• a hydraulic source for supplying the hydraulic fluid in the hydraulic fluid tank as high-pressure oil,
• a steering circuit that includes a steering cylinder that extends and compresses to steer steering wheels by the pressure oil supplied from the hydraulic source, a steering valve that controls the flow of pressure oil supplied from the hydraulic source to the steering cylinder, and an accumulator capable of storing the pressure oil supplied from the hydraulic source and supplying the stored pressure oil to the steering cylinder via the steering valve;
• wherein the steering circuit is configured to be connected to the hydraulic source and the hydraulic fluid tank via a composite control valve;
• wherein the composite control valve has a first position that allows communication between the steering circuit and the hydraulic source while blocking communication between the steering circuit and the hydraulic fluid tank, and a second position that allows communication between the steering circuit and the hydraulic source while also allowing communication between the steering circuit and the hydraulic fluid tank to discharge the pressure oil from the accumulator into the hydraulic fluid tank;
• and
• wherein the composite control valve, in the second position, has a throttle in the oil passage that allows communication between the steering circuit and the hydraulic fluid tank.