PURPOSE: To enhance the safety and efficiency of working by providing a self- propelling vehicle part which can travel in a working area, a working means for carrying out a desired work by means of an arm member, and a conveying means provided in the longitudinal direction of the vehicle.

CONSTITUTION: Rollers 27 are provided on opposite sides of a conveyer 26 stretched between left and right crawlers 11. The roller 27 rolls along rails 31 so that the conveyer 26 can move in a direction longitudinal of a self-propelling vehicle part 20. Then, sediment fed into a hopper 33 by a bucket 17 is conveyed by means of the conveyer 26, and then is conveyed upward by an inclined conveyer 35 toward its rear end. Then the sediment is fed into a cargo bed 38 of a truck 37. With this arrangement, sediment or the like can be conveyed without turning a vehicle body as a hydraulic shovel, thereby it is possible to reduce the working space, and to enhance the safety and efficiency of working.