... 3-2 3The oil from the front and rear pump flows through the neutral oil passage, bypass oil passage ... MOTORARM1BOOM2SWINGTRAVEL(LH)TRAVEL(RH)OPTIONBOOM1BUCKETARM2dr2~dr8BUCKET CYLINDERBOOM CYLINDERXBkXBp1STRAIGHTTRAVEL SPOOLGROUP 5 COMBINED OPERATION25073HC21
3-2 4When the swing and boom functions are operated, simultaneously the swing spool and boom spoolschanged. ... MOTORARM1BOOM2SW...
... SYSTEMGroup 1 Hydraulic Circuit 3-1 Group 2 Main Circuit 3-2 Group 3 Pilot Circuit 3-5 Group 4 Single Operation 3-1 3Group 5 Combined Operation 3-2 3
GROUP 1 HYDRAULIC CIRCUITSECTION ... Accumulator36 Accumulator37 Stop valve38 Port relief valve39 Port relief valve40Selector valve 3-1 25073HC01
... 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 ... 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, the oil...
... LEVER(RH)HYDTANKLINEFILTERSAFETYSOLENOID VALVEMAX FLOW CUT OFFSOLENOID VALVEPm2MPm2Pm1Pm1BUCKET CYLINDERBOOM CYLINDER25073HC08
3-1 2When carrying out the combined operation of swing and boom or arm of the left control valve, ... boost solenoid valveLine filterMax flow cut off solenoid valveSwing speed reducing valve25073CI03
3-6 BUCKET CYLINDERBOOM CYLINDERARM CYLINDERTRAVEL MOTORSWING...
... R2FRONTPUMPREARPUMPMAKE UP VALVERELIEF VALVEBOOM HOLDING VALVEBUCKET CYLINDERBOOM CYLINDER25073HC11
3-1 5When the LH control lever is pulled back, the arm spools in the main control valve are ... R2FRONTPUMPREARPUMPXAa1XAa2XBa1XBa2Aa1Ba1PaLXBa2XAa2ARM1MAKE UPVALVERELIEFVALVEARM HOLDING VALVEBUCKET CYLINDERBOOM CYLINDER25073HC13
3-1 6When the LH control lever is pushed forward, the arm s...