Drive device of hydraulic cylinder for working

A drive device of work hydraulic cylinders, comprising:

• a hydraulic source;
• outrigger cylinders mounted at front and rear of a vehicle on a left side and a right side, that are to be driven with pressure oil from the hydraulic source;
• a control valve that controls a flow of pressure oil from the hydraulic source to the outrigger cylinders;
• an operating device that issues a command for drive of the control valve;
• a first selector switch that selects an independent operation of one of a left-side outrigger cylinder and a right-side outrigger cylinder or simultaneous operations of the left-side outrigger cylinder and the right-side outrigger cylinder;
• a second selector switch that selects an independent operation of one of a front-side outrigger cylinder and a rear-side outrigger cylinder or simultaneous operations of the front-side outrigger cylinder and the rear-side outrigger cylinder;
• and
• a pressure oil control device that allows the pressure oil to flow to an outrigger cylinder selected with the first selector switch and the second selector switch and disallowing flow of the pressure oil to other outrigger cylinders.