PURPOSE: To realize a direct remote control by combining a transmitter at a high pressure pump side and a receiver at a working site side which a high pressure hose in which metal wires are incorporated, receiving the signal from the transmitter of a worker, and controlling the engine by the output of the signal.

CONSTITUTION: The water is delivered from a water tank 60 at the pump side (I) of a washing vehicle to a working site from a hose 10 through a high pressure pump 40, a high hydraulic pressure changeover valve 50, and a hose reel 11. Signals of a high pressure, a no pressure, and an engine control are output in a working site operation member 90 by using a transceiver 80 as the input function. These signals are transmitted to a transceiver 70 at the pump side through the metal wire incorporated in the high pressure water hose 10, and by controlling the engine 30 through a control circuit 20, the high pressure pump 40 is controlled. And a high hydraulic pressure changeover valve 50 is also controlled. In such a way, a direct remote control can be carried out from the working site.