This paper describes the manufacturing of an experimental backhoe for advanced remote-control system. The experimental backhoe is reconstruction of 0.1m3 class mini shovel attaching proportional-type electric control valves for hydraulic power, valve drivers, potentio meters for joint angles, a reaction force sensor.
　These sensor data acquisition and hydraulic power control are systematically carried out by A/D,D/A interface boards of control PC. When the control PC receives coordinate data directed from the input device, it calculates the joint angles of backhoe to follow the coordinate, and then controls the electric control valves automatically. The experimental backhoe has 2 ways of manual emergency stop. When the network of control system is broken down, all the electric control valves are returned to neutral.