Hydraulic system for work machine

A hydraulic system for a work machine comprising:

• a first control valve to control a first hydraulic actuator;
• a second control valve to control a second hydraulic actuator;
• a tank to store an operation fluid;
• a first operation fluid tube through which the operation fluid is to be supplied to the first control valve;
• a second operation fluid tube through which the operation fluid is to be supplied to the second control valve;
• a first transmission fluid tube through which a load pressure of the first hydraulic actuator controlled by the first control valve is to be transmitted;
• a second transmission fluid tube through which a load pressure of the second hydraulic actuator controlled by the second control valve is to be transmitted;
• a first switch valve switchable between a confluent position and an isolation position, the first switch valve being switched to the confluent position such that the first operation fluid tube is connected to the second operation fluid tube and the first transmission fluid tube is connected to the second transmission fluid tube, the first switch valve being switched to the isolation position such that the first operation fluid tube is disconnected from the second operation fluid tube and the first transmission fluid tube is disconnected from the second transmission fluid tube;
• a first return circuit to be connected to the first transmission fluid tube such that the operation fluid in the first transmission fluid tube is to be returned to the tank through the first return circuit when the first switch valve is switched to the isolation position, the first return circuit being to be disconnected from the first transmission fluid tube when the first switch valve is switched to the confluent position;
• and
• a second return circuit through which the operation fluid in the second transmission fluid tube is returned to the tank when the first switch valve is switched to one of the confluent position and the isolation position.