... hydraulic tank through the control valve and the oilcooler.To oil coolerSuction filter(290LC-7) 3-2 3-3 All oil from each actuator returns to the hydraulic tank through the control valve.The bypass ... valve ActuatorsFull flow filterCheck valve(1)5.0kgf/cm2Check valve (2)3 .0kgf/cm2Check valve(3)1.5kgf/cm2Oil cooler25073HC02 3 -4 3. DRAIN CIRCUITBesides internal leaks from the motors and main pump, ... valves are provided in the return circuit.The setting pressure of bypass check valves are 3.0kgf/cm2 (43 psi) and 5.0kgf/cm2(71psi). Usually, oilreturns to the hydraulic tank from the left side of control...