Shop manual máy đào Huyndai R480, 520LC Phần thủy lực
3-5The pilot circuit consists of suction circuit, delivery circuit and return circuit.The pilot pump is provided with relief valve, receives the oil from the hydraulic tank through the suction filter.The discharged oil from the pilot pump flows to the remote control valve through line filter, EPPR valve, solenoid valve assemblies, swing parking brake, main control valve and safety lock solenoid valve.GROUP 3 PILOT CIRCUITGROUP 3 PILOT CIRCUITRelief valve40kgf/cmRCV pedalRemote control valve(LH lever)Remote control valve(RH lever)Safety locksolenoid valveSwing parking brakePilot pumpSuction filterMCVTravel speed solenoid valveMain pump2Power boost solenoid valveLine filterBoom priority EPPR valve48093CI01 3-6The pilot pump receive oil from the hydraulic tank. The discharged oil from the pilot pump flows to the safety solenoid valve through the line filter. The oil is filtered by the line filter. The pilot relief valve is provided in the pilot pump for limiting the pilot circuit pressure.The oil filtered by line filter flows remote control valve through safety solenoid valve.The return oil from remote control valve returned to hydraulic tank. 1. SUCTION, DELIVERY AND RETURN CIRCUIT1. SUCTION, DELIVERY AND RETURN CIRCUITSTRAIGHT TRAVELTRAVEL-LHBOOM1BUCKETARM2ARM1OPTIONTRAVEL-RHBOOM2SWINGP3P2Pa6TPG(S/Motor)A1A2A3P1P4A5SWING MOTORTRAVEL MOTORTRAVELHYDRAULIC TANKFRONTPUMPREARPUMPPILOTPUMPLINE FILTERARMCYLINDERBUCKETCYLINDERBOOMCYLINDERA1A2Dr#, dr#PP(MCV)(4)(1)(2)(3)PTPb6Pa1Pb1(4)(1)(2)(3)PTRCV PEDALSWINGARMBUCKETBOOM(4)(1)(2)(3)PTabd e fghjPb5Pb8Pa8Pa2Pb2Pa5Pa7Pb7cd1h1PS PSSAFETYSOLENOIDVALVEPc6(MCV)Pk(T/Joint)PH(MCV)PSps1ps2PSPST3T1T2T4pa10B9A9pb9pa9B8A8pb8pa8DR2pc2A7B7pa7pb7B6A6pb6pa6P3P2PHPAPPPTP1pr1pa1pb1A1B1pc6pa2DR3pb2A2B2pa3pb3B3A3pa4pb4A4B4A5B5pc1DR1pa11PSpc2pa3pa11pb9pb5POPSSHpa5pa9pcipb348093HC02 P3P2Pa6TPG(S/Motor)A1A2A3P1P4A5SWING MOTORTRAVEL MOTORTRAVELHYDRAULIC TANKFRONTPUMPREARPUMPPILOTPUMPLINE FILTERARMCYLINDERBUCKETCYLINDERBOOMCYLINDERA1A2Dr#, dr#PP(MCV)(4)(1)(2)(3)PTPb6Pa1Pb1(4)(1)(2)(3)PTRCV PEDALSWINGARMBUCKETBOOM(4)(1)(2)(3)PTabd e fghjPb5Pb8Pa8Pa2Pb2Pa5Pa7Pb7cd1h1PS PSSAFETYSOLENOIDVALVEPc6(MCV)Pk(T/Joint)PH(MCV)PSLEVER DOWNLEVER UPPSSHpb8pc1PSSHpa7pb7STRAIGHT TRAVELTRAVEL-LHBOOM1BUCKETARM2ARM1OPTIONTRAVEL-RHBOOM2SWINGps1ps2PSPST3T1T2T4pa10B9A9pb9pa9B8A8pb8pa8DR2pc2A7B7pa7B6A6pb6pa6P3P2PHPAPPPTP1pr1pa1pb1A1B1pc6pa2DR3pb2A2B2pa3pb3B3A3pa4pb4A4B4A5B5pc1DR1pa11PSpc2pa3pa11pb9pb5POpa5pa9pcipb33-7When the lever of the safety solenoid valve is moved downward, oil flows into the remote control valve through solenoid valve and line filter.When the lever of the safety solenoid valve moved upward, oil does not flows into the remote control valve, because of blocked by the spool.2. SAFETY SOLENOID VALVE 2. SAFETY SOLENOID VALVE (SAFETY LEVER)48093HC03 3-83. BOOM PRIORITY SYSTEM3. BOOM PRIORITY SYSTEMBOOM PRIORITYEPPR VALVEP3P2Pa6TPG(S/Motor)A1A2A3P1P4A5SWING MOTORTRAVEL MOTORTRAVELHYDRAULIC TANKFRONTPUMPREARPUMPPILOTPUMPLINE FILTERARMCYLINDERBUCKETCYLINDERBOOMCYLINDERA1A2Dr#, dr#PP(MCV)(4)(1)(2)(3)PTPb6Pa1Pb1(4)(1)(2)(3)PTRCV PEDALSWINGARMBUCKETBOOM(4)(1)(2)(3)PTabd e fghjPb5Pb8Pa8Pa2Pb2Pa5Pa7Pb7cd1h1PS PSPc6(MCV)Pk(T/Joint)PH(MCV)PSSTRAIGHT TRAVELTRAVEL-LHBOOM1BUCKETARM2ARM1OPTIONTRAVEL-RHBOOM2SWINGps1ps2PSPST3T1T2T4pa10B9A9pb9pa9B8A8pb8pa8DR2pc2A7B7pa7pb7B6A6pb6pa6P3P2PHPAPPPTP1pr1pa1pb1A1B1pc6pa2DR3pb2A2B2pa3pb3B3A3pa4pb4A4B4A5B5pc1DR1pa11PSpc2pa3pa11pb9pb5POpa5pa9pcipb348093HC04When carrying out the combined operation of swing and boom up, the boom up operating speed is lowered then normal operation. To increase working efficiency, swing speed reducing system is used.The pilot oil from pilot pump flow into Pc6 Pc6 port in main control valve through boom EPPR valve. Pc6 Pc6 oil pressure moves swing reducing spool to right direction and oil flow rate to the swing motor decreased.Then, the boom up speed is increased. This is called the boom priority system. 3-93-9When the travel speed switch is pushed, the travel speed solenoid valve is actuated and the discharged oil from the pilot pump flows to the XX port of pilot valve in the travel motors.As a result, the control piston is pushed by the main oil flow, thus the displacement is minimized.When the travel speed switch is pushed once more, the travel speed solenoid valve is return to original position by the force of spring, the hydraulic oil of XX port returns to the hydraulic tank.As a result, the control piston is returned by the main oil flow, thus the displacement is maximized.4. TRAVEL SPEED CONTROL 4. TRAVEL SPEED CONTROL SYSTEMSYSTEMP3P2Pa6TPG(S/Motor)A1A2A3P1P4A5SWING MOTORTRAVEL MOTORTRAVELHYDRAULIC TANKFRONTPUMPREARPUMPPILOTPUMPLINE FILTERARMCYLINDERBUCKETCYLINDERBOOMCYLINDERA1A2Dr#, dr#PP(MCV)(4)(1)(2)(3)PTPb6Pa1Pb1(4)(1)(2)(3)PTRCV PEDALSWINGARMBUCKETBOOM(4)(1)(2)(3)PTabd e fghjPb5Pb8Pa8Pa2Pb2Pa5Pa7Pb7cd1h1PS PSPc6(MCV)Pk(T/Joint)PH(MCV)PSTRAVEL SPEEDSOLENOID VALVEPkACBDPDrSMAReverseForwardBARHR/GMBXBreSMAReverseForwardBALHR/GMBXTBreTpb8STRAIGHT TRAVELTRAVEL-LHBOOM1BUCKETARM2ARM1OPTIONTRAVEL-RHBOOM2SWINGps1ps2PSPST3T1T2T4pa10B9A9pb9pa9B8A8pb8pa8DR2pc2A7B7pa7pb7B6A6pb6pa6P3P2PHPAPPPTP1pr1pa1pb1A1B1pc6pa2DR3pb2A2B2pa3pb3B3A3pa4pb4A4B4A5B5pc1DR1pa11PSpc2pa3pa11pb9pb5POpa5pa9pcipb348093HC05 3-10When the power max switch on the left control lever is pushed ON, the power max solenoid valve is actuated, the discharged oil from the pilot pump flow into PH port of the main relief valve of main control valve ; Then the setting pressure of the main control valve is raises from 330 kgf/cm2 to 360 kgf/cm2 for increasing the digging power. And even when press continuously, it is canceled after 8 seconds. 5. MAIN RELIEF PRESSURE CHANGE CIRCUIT5. MAIN RELIEF PRESSURE CHANGE CIRCUITPOWER MAXSOLENOID VALVEAuto power boostP3P2Pa6TPG(S/Motor)A1A2A3P1P4A5SWING MOTORTRAVEL MOTORTRAVELHYDRAULIC TANKFRONTPUMPREARPUMPPILOTPUMPLINE FILTERARMCYLINDERBUCKETCYLINDERBOOMCYLINDERA1A2Dr#, dr#PP(MCV)(4)(1)(2)(3)PTPb6Pa1Pb1(4)(1)(2)(3)PTRCV PEDALSWINGARMBUCKETBOOM(4)(1)(2)(3)PTabd e fghjPb5Pb8Pa8Pa2Pb2Pa5Pa7Pb7cd1h1PS PSPc6(MCV)Pk(T/Joint)PH(MCV)PSSTRAIGHT TRAVELTRAVEL-LHBOOM1BUCKETARM2ARM1OPTIONTRAVEL-RHBOOM2SWINGps1ps2PSPST3T1T2T4pa10B9A9pb9pa9B8A8pb8pa8DR2pc2A7B7pa7pb7B6A6pb6pa6P3P2PHPAPPPTP1pr1pa1pb1A1B1pc6pa2DR3pb2A2B2pa3pb3B3A3pa4pb4A4B4A5B5pc1DR1pa11PSpc2pa3pa11pb9pb5POpa5pa9pcipb348093HC06 6. SWING PARKING BRAKE RELEASE6. SWING PARKING BRAKE RELEASEP3P2Pa6TPG(S/Motor)A1A2A3P1P4A5TRAVEL MOTORTRAVELHYDRAULIC TANKFRONTPUMPREARPUMPPILOTPUMPLINE FILTERARMCYLINDERBUCKETCYLINDERBOOMCYLINDERA1A2Dr#, dr#PP(MCV)(4)(1)(2)(3)PTPb6Pa1Pb1(4)(1)(2)(3)PTRCV PEDALSWINGARMBUCKETBOOM(4)(1)(2)(3)PTabd e fghjPb5Pb8Pa8Pa2Pb2Pa5Pa7Pb7cd1h1PS PSPc6(MCV)Pk(T/Joint)PH(MCV)PSSWING MOTORSHAuGBSHPGDrGAB(cw)A(ccw)AuGBSHPGDrGAB(cw)A(ccw)PGSTRAIGHT TRAVELTRAVEL-LHBOOM1BUCKETARM2ARM1OPTIONTRAVEL-RHBOOM2SWINGps1ps2PSPST3T1T2T4pa10B9A9pb9pa9B8A8pb8pa8DR2pc2A7B7pa7pb7B6A6pb6pa6P3P2PHPAPPPTP1pr1pa1pb1A1B1pc6pa2DR3pb2A2B2pa3pb3B3A3pa4pb4A4B4A5B5pc1DR1pa11PSpc2pa3pa11pb9pb5POpa5pa9pcipb33-1148093HC07When one of the RCV lever (except travel lever) is tilted, the pilot oil flows into SH port through main control valve. This pressure moves spool so, discharged oil from pilot valve flows to swing motor PG port.This pressure is applied to swing motor disc, thus the brake is released.When all of the RCV lever are set in the neutral position, oil in the swing motor disc cylinder is drained, thus the brake is applied. . SUCTION, DELIVERY AND RETURN CIRCUITSTRAIGHT TRAVELTRAVEL-LHBOOM1BUCKETARM2ARM1OPTIONTRAVEL-RHBOOM2SWINGP3P2Pa6TPG(S/Motor)A1A2A3P1P4A5SWING MOTORTRAVEL MOTORTRAVELHYDRAULIC. UPPSSHpb8pc1PSSHpa7pb7STRAIGHT TRAVELTRAVEL-LHBOOM1BUCKETARM2ARM1OPTIONTRAVEL-RHBOOM2SWINGps1ps2PSPST3T1T2T4pa10B9A9pb9pa9B8A8pb8pa8DR2pc2A7B7pa7B6A6pb6pa6P3P2PHPAPPPTP1pr1pa1pb1A1B1pc6pa2DR3pb2A2B2pa3pb3B3A3pa4pb4A4B4A5B5pc1DR1pa11PSpc2pa3pa11pb9pb5POpa5pa9pcipb3 3-7 When