Control system for push-pull unit mounted on motor scraper

摘要

A control system for a push-pull unit mounted on a motor scraper has a push-pull control circuit including a bail actuating cylinder and a directional change-over valve, a suspension control circuit and an electric operating circuit for changing over the directional change-over valve to supply fluid under pressure from a hydraulic pump into either the push-pull control circuit or the suspension control circuit in accordance with the operator's indication. The directional change-over valve is changed over by an actuator connected with a pressure source through a pressurized medium passage in which solenoid operated valves controlled by the electric operating circuit are provided.