DUMP TRUCK

摘要

In order to provide a dump trunk that can be precisely guided to a destination even while unmanned without modifications being made to safety-critical parts, the dump trunk is provided with: a manned steering valve (20) for controlling the supply of oil to a steering cylinder (SC) in response to operation of a handle (21); an unmanned steering valve (30) for controlling the supply of oil to the steering cylinder (SC) in response to a control signal provided from a controller (40); and a main switching valve (70) which is provided on manned oil supply paths (23L, 23R) at a location thereon upstream from the points of connection to unmanned oil supply paths (31L, 31R), said main switching valve (70) being used for switching the manned steering valve (20) and the steering cylinder (SC) between a communication state and a cutoff state. When oil is to be supplied to the steering cylinder (SC) via the unmanned steering valve (30), the main switching valve (70) provides a cutoff state between the manned steering valve (20) and the steering cylinder (SC).