Shop manual máy đào HuynDai R170W-9 (Phần 1) Phần thủy lực
3-143-14GROUP 4 SINGLE OPERATIONGROUP 4 SINGLE OPERATIONWhen the right control lever is pulled back, the boom spools in the main control valve are moved to the up position by the pilot oil pressure from the remote control valve.The oil from the A1 and A2 pump flows into the main control valve and then goes to the large chamber of boom cylinders. At the same time, the oil from the small chamber of boom cylinders returns to the hydraulic oil tank through the boom spool in the main control valve. When this happens, the boom goes up. The excessive pressure in the boom cylinder head side is prevented by relief valve. When the boom is up and the control lever is returned to neutral position, the circuit for the holding pressure at the head side of the boom cylinder is closed by the boom holding valve. This prevents the hydraulic drift of boom cylinder.1. BOOM UP OPERATION1. BOOM UP OPERATIONB1A1A2B2PT2T4(TGP)ACC1GPBR1BR2ACC2ACC1CT4PPGPCT3CT1CT2dr3dr2BRAKE VALVEARMCYLINDERBUCKETCYLINDERTRAVEL MOTORFRONT AXLEREAR AXLEOSCILLATINGCYLINDERTRANSMISSIONSWING MOTORTURNINGJOINTBOOM CYLINDERTPM2PTPTMKBAC1T3P1P1P2L RM1PuPc42Pb3Pd41DR1Pb21Pb20Pa20Pb1Pa1T1Pc3Pa21V3Pd2D2C2Pc1D1C1Pd1AiB4B5A5Pa5Pb5Pa4Pb4C5D5D4C4Pc40Pd40DR3Pc5Pd5RsC6D6P03PSP1P2P3P0PattP02PSPn1Pi1(Pump)Pi2(Pump)Pn2PSPSPd6Pc6PSPc2P05PuoPc41DR5DR2DR4DR0SH(S/Motor)ARM 1BOOM 2SWINGTRAVELOPT-CBOOM 1ARMREGENBUCKETOPT-BDOZERARM 2PILOTPUMPHYDRAULIC TANKBOOMHOLDINGVALVERELIEFVALVEDOZER/ OUTRIGGER CYLINDERA1PUMPA2PUMPP0417W93HC10 3-153-15When the right control lever is pushed forward, the boom 1 spool in the main control valve is moved to the down position by the pilot oil pressure from the remote control valve.The oil from the A2 pump flows into the main control valve and then goes to the small chamber of boom cylinders. At the same time, the oil from the large chamber of boom cylinders returns to the hydraulic tank through the boom 1 spool in the main control valve.When the down speed of boom is faster, the oil returned from the large chamber of boom cylinder combines with the oil from the A2 pump, and flows into the small chamber of the cylinder.This prevents cylinder cavitation by the negative pressure when the A2 pump flow can not match the boom down speed. And the excessive pressure in the boom cylinder rod side is prevented by the relief valve.2. BOOM DOWN OPERATION2. BOOM DOWN OPERATIONB1A1A2B2PT2T4(TGP)ACC1GPBR1BR2ACC2ACC1CT4PPGPCT3CT1CT2dr3dr2BRAKE VALVEARMCYLINDERBUCKETCYLINDERTRAVEL MOTORFRONT AXLEREAR AXLEOSCILLATINGCYLINDERTRANSMISSIONSWING MOTORTURNINGJOINTBOOM CYLINDERTPM2PTPTMKBAC1T3P1P1P2L RM1PuPc42Pb3Pd41DR1Pb21Pb20Pa20Pb1Pa1T1Pc3Pa21V3Pd2D2C2Pc1D1C1Pd1AiB4B5A5Pa5Pb5Pa4Pb4C5D5D4C4Pc40Pd40DR3Pc5Pd5RsC6D6P03PSP1P2P3P0PattP02PSPn1Pi1(Pump)Pi2(Pump)Pn2PSPSPd6Pc6PSPc2P05PuoPc41DR5DR2DR4DR0SH(S/Motor)ARM 1BOOM 2SWINGTRAVELOPT-CBOOM 1ARMREGENBUCKETOPT-BDOZERARM 2PILOTPUMPHYDRAULIC TANKDOZER/ OUTRIGGER CYLINDERA1PUMPA2PUMPP04RELIEFVALVE17W93HC11 3-163-16When the left control lever is pulled back, the arm spools in the main control valve are moved to the arm in position by the pilot oil pressure from the remote control valve.The oil from the A1 and A2 pump flows into the main control valve and then goes to the large chamber of arm cylinder.At the same time, the oil from small chamber of arm cylinder returns to the hydraulic oil tank through the arm spool in the main control valve. When this happens, the arm rolls in. The excessive pressure in the arm cylinder head side is prevented by relief valve.The cavitation which will happen to the head side of the arm cylinder is also prevented by the make-up valve in the main control valve.3. ARM IN OPERATION3. ARM IN OPERATIONB1A1A2B2PT2T4(TGP)ACC1GPBR1BR2ACC2ACC1CT4PPGPCT3CT1CT2dr3dr2BRAKE VALVEARMCYLINDERBUCKETCYLINDERTRAVEL MOTORFRONT AXLEREAR AXLEOSCILLATINGCYLINDERTRANSMISSIONSWING MOTORTURNINGJOINTBOOM CYLINDERTPM2PTPTMKBAC1T3P1P1P2L RM1PuPc42Pb3Pd41DR1Pb21Pb20Pa20Pb1Pa1T1Pc3Pa21V3Pd2D2C2Pc1D1C1Pd1AiB4B5A5Pa5Pb5Pa4Pb4C5D5D4C4Pc40Pd40DR3Pc5Pd5RsC6D6P03PSP1P2P3P0PattP02PSPn1Pi1(Pump)Pi2(Pump)Pn2PSPSPd6Pc6PSPc2P05PuoPc41DR5DR2DR4DR0SH(S/Motor)ARM 1BOOM 2SWINGTRAVELOPT-CBOOM 1ARMREGENBUCKETOPT-BDOZERARM 2PILOTPUMPHYDRAULIC TANKDOZER/ OUTRIGGER CYLINDERA1PUMPA2PUMPP04MAKE UPVALVERELIEF VALVE17W93HC12 3-173-17When the left control lever is pushed forward, the arm spools in the main control valve are moved to the arm out position by the pilot oil pressure from the remote control valve.The oil from the A1 and A2 pump flows into the main control valve and then goes to the small chamber of arm cylinder. At the same time, the oil from the large chamber of arm cylinder returns to the hydraulic oil tank through the arm spool in the main control valve. When this happens, the arm rolls out. The cavitation which will happen to the rod side of the arm cylinder is also prevented by the make-up valve in the main control valve. When the arm is roll out and the control lever is returned to neutral position, the circuit for the holding pressure at the rod side of the arm cylinder is closed by the arm holding valve. This prevent the hydraulic drift of arm cylinder.4. ARM OUT OPERATION4. ARM OUT OPERATIONB1A1A2B2PT2T4(TGP)ACC1GPBR1BR2ACC2ACC1CT4PPGPCT3CT1CT2dr3dr2BRAKE VALVEARMCYLINDERBUCKETCYLINDERTRAVEL MOTORFRONT AXLEREAR AXLEOSCILLATINGCYLINDERTRANSMISSIONSWING MOTORTURNINGJOINTBOOM CYLINDERTPM2PTPTMKBAC1T3P1P1P2L RM1PuPc42Pb3Pd41DR1Pb21Pb20Pa20Pb1Pa1T1Pc3Pa21V3Pd2D2C2Pc1D1C1Pd1AiB4B5A5Pa5Pb5Pa4Pb4C5D5D4C4Pc40Pd40DR3Pc5Pd5RsC6D6P03PSP1P2P3P0PattP02PSPn1Pi1(Pump)Pi2(Pump)Pn2PSPSPd6Pc6PSPc2P05PuoPc41DR5DR2DR4DR0SH(S/Motor)ARM 1BOOM 2SWINGTRAVELOPT-CBOOM 1ARMREGENBUCKETOPT-BDOZERARM 2PILOTPUMPHYDRAULIC TANKARMHOLDINGVALVERELIEFVALVEDOZER/ OUTRIGGER CYLINDERA1PUMPA2PUMPP04MAKE UP VALVE17W93HC13 3-183-18When the right control lever is pulled left, the bucket spool in the main control valve is moved to the roll in position by the pilot oil pressure from the remote control valve.The oil from the A2 pump flows into the main control valve and then goes to the large chamber of bucket cylinder.At the same time, the oil from the small chamber of bucket cylinder returns to the hydraulic oil tank through the bucket spool in the main control valve. When this happens, the bucket rolls in.The excessive pressure in the bucket cylinder head side is prevented by relief valve.The cavitation which will happen to the head side of the bucket cylinder is also prevented by the make-up valve in the main control valve.5. BUCKET IN OPERATION5. BUCKET IN OPERATIONB1A1A2B2PT2T4(TGP)ACC1GPBR1BR2ACC2ACC1CT4PPGPCT3CT1CT2dr3dr2BRAKE VALVEARMCYLINDERBUCKETCYLINDERTRAVEL MOTORFRONT AXLEREAR AXLEOSCILLATINGCYLINDERTRANSMISSIONSWING MOTORTURNINGJOINTBOOM CYLINDERTPM2PTPTMKBAC1T3P1P1P2L RM1PuPc42Pb3Pd41DR1Pb21Pb20Pa20Pb1Pa1T1Pc3Pa21V3Pd2D2C2Pc1D1C1Pd1AiB4B5A5Pa5Pb5Pa4Pb4C5D5D4C4Pc40Pd40DR3Pc5Pd5RsC6D6P03PSP1P2P3P0PattP02PSPn1Pi1(Pump)Pi2(Pump)Pn2PSPSPd6Pc6PSPc2P05PuoPc41DR5DR2DR4DR0SH(S/Motor)ARM 1BOOM 2SWINGTRAVELOPT-CBOOM 1ARMREGENBUCKETOPT-BDOZERARM 2HYDRAULIC TANKMAKE UPVALVERELIEFVALVEDOZER/ OUTRIGGER CYLINDERPILOTPUMPA1PUMPA2PUMPP0417W93HC14 3-193-19When the right control lever is pushed right, the bucket spool in the main control valve is moved to the bucket out position by the pilot oil pressure from the remote control valve.The oil from the A2 pump flows into the main control valve and then goes to the small chamber of bucket cylinder.At the same time, the oil from the large chamber of bucket cylinder returns to the hydraulic oil tank through the bucket spool in the main control valve. When this happens, the bucket rolls out.The cavitation which will happen to the rod side of the bucket cylinder is also prevented by the make-up valve in the main control valve.6. BUCKET OUT OPERATION6. BUCKET OUT OPERATIONB1A1A2B2PT2T4(TGP)ACC1GPBR1BR2ACC2ACC1CT4PPGPCT3CT1CT2dr3dr2BRAKE VALVEARMCYLINDERBUCKETCYLINDERTRAVEL MOTORFRONT AXLEREAR AXLEOSCILLATINGCYLINDERTRANSMISSIONSWING MOTORTURNINGJOINTBOOM CYLINDERTPM2PTPTMKBAC1T3P1P1P2L RM1PuPc42Pb3Pd41DR1Pb21Pb20Pa20Pb1Pa1T1Pc3Pa21V3Pd2D2C2Pc1D1C1Pd1AiB4B5A5Pa5Pb5Pa4Pb4C5D5D4C4Pc40Pd40DR3Pc5Pd5RsC6D6P03PSP1P2P3P0PattP02PSPn1Pi1(Pump)Pi2(Pump)Pn2PSPSPd6Pc6PSPc2P05PuoPc41DR5DR2DR4DR0SH(S/Motor)ARM 1BOOM 2SWINGTRAVELOPT-CBOOM 1ARMREGENBUCKETOPT-BDOZERARM 2HYDRAULIC TANKMAKE UPVALVERELIEFVALVEDOZER/ OUTRIGGER CYLINDERPILOTPUMPA1PUMPA2PUMPP0417W93HC15 3-203-20When the dozer control lever is pulled back, the dozer spool in the main control valve is moved to the dozer up position by the pilot oil pressure from the remote control valve. The oil from the A1 pump flows into the main control valve and then goes to the small chamber of rear actuator cylinder (dozer or outrigger).The other case, the oil flows into the small chamber of front actuator cylinder (dozer or outrigger).At the same time, the oil from the large chamber of dozer (outrigger) cylinders returns to the hydraulic oil tank through the dozer spool in the main control valve. When this happens, the dozer (outrigger) goes up.7. DOZER/OUTRIGGER UP OPERATION7. DOZER/OUTRIGGER UP OPERATIONB1A1A2B2PT2T4(TGP)ACC1GPBR1BR2ACC2ACC1CT4PPGPCT3CT1CT2dr3dr2BRAKE VALVEARMCYLINDERBUCKETCYLINDERTRAVEL MOTORFRONT AXLEREAR AXLEOSCILLATINGCYLINDERTRANSMISSIONSWING MOTORTURNINGJOINTBOOM CYLINDERTPM2PTPTMKBAC1T3P1DOZER/ OUTRIGGER CYLINDERP1P2L RM1PuPc42Pb3Pd41DR1Pb21Pb20Pa20Pb1Pa1T1Pc3Pa21V3Pd2D2C2Pc1D1C1Pd1AiB4B5A5Pa5Pb5Pa4Pb4C5D5D4C4Pc40Pd40DR3Pc5Pd5RsC6D6P03PSP1P2P3P0PattP02PSPn1Pi1(Pump)Pi2(Pump)Pn2PSPSPd6Pc6PSPc2P05PuoPc41DR5DR2DR4DR0SH(S/Motor)ARM 1BOOM 2SWINGTRAVELOPT-CBOOM 1ARMREGENBUCKETOPT-BDOZERARM 2HYDRAULIC TANKPILOTPUMPA1PUMPA2PUMPP0417W93HC16 3-213-218. DOZER/OUTRIGGER DOWN OPERATION8. DOZER/OUTRIGGER DOWN OPERATIONB1A1A2B2PT2T4(TGP)ACC1GPBR1BR2ACC2ACC1CT4PPGPCT3CT1CT2dr3dr2BRAKE VALVEARMCYLINDERBUCKETCYLINDERTRAVEL MOTORFRONT AXLEREAR AXLEOSCILLATINGCYLINDERTRANSMISSIONSWING MOTORTURNINGJOINTBOOM CYLINDERTPM2PTPTMKBAC1T3P1DOZER/ OUTRIGGER CYLINDERP1P2L RM1PuPc42Pb3Pd41DR1Pb21Pb20Pa20Pb1Pa1T1Pc3Pa21V3Pd2D2C2Pc1D1C1Pd1AiB4B5A5Pa5Pb5Pa4Pb4C5D5D4C4Pc40Pd40DR3Pc5Pd5RsC6D6P03PSP1P2P3P0PattP02PSPn1Pi1(Pump)Pi2(Pump)Pn2PSPSPd6Pc6PSPc2P05PuoPc41DR5DR2DR4DR0SH(S/Motor)ARM 1BOOM 2SWINGTRAVELOPT-CBOOM 1ARMREGENBUCKETOPT-BDOZERARM 2HYDRAULIC TANKPILOTPUMPA1PUMPA2PUMPP0417W93HC17When the dozer control lever is pushed forward, the dozer spool in the main control valve is moved to the dozer down position by the pilot oil pressure from the remote control valve. The oil from the A1 pump flows into the main control valve and then goes to the large chamber of rear actuator cylinder (dozer or outrigger).The other case, the oil flows into the large chamber of front actuator cylinder (dozer or outrigger).At the same time, the oil from the small chamber of dozer (outrigger) cylinders returns to the hydraulic oil tank through the dozer spool in the main control valve. When this happens, the dozer (outrigger) goes down. 3-223-22When the left control lever is pushed left or right, the swing spool in the main control valve is moved to the left or right swing position by the pilot oil pressure from the remote control valve.Also the swing operation preference function is operated by the pilot pressure Pc3 (refer to page 2-34).The oil from the A1 pump flows into the main control valve and then goes to the swing motor.At the same time, the return oil from the swing motor returns to the hydraulic oil tank through the swing spool in the main control valve.When this happens, the upper structure swings to the left or right.The swing parking brake, make up valve and the motor brake valve are provided in the swing motor. The cavitation which will happen to the swing motor is also prevented by the make up valve in the swing motor itself.9. SWING OPERATION9. SWING OPERATIONB1A1A2B2T(dr1)PO3(MCV)PT2T4(TGP)ACC1GPBR1BR2ACC2ACC1CT4PPGPCT3CT1CT2dr3dr2BRAKE VALVEARMCYLINDERBUCKETCYLINDERTRAVEL MOTORFRONT AXLEREAR AXLEOSCILLATINGCYLINDERTRANSMISSIONTURNINGJOINTBOOM CYLINDERTPM2PTPTMKBAC1T3P1P1P2SWING ARMBUCKET BOOMPTPT(1)cPc3PSPd40Pa5Pb5Pc2Pd2Pc40Pa20Pb20PSd1h1(3)PS(4) (3) (1) (2) (4)(2)RCV LEVER(LH)RCV LEVER(RH)Pb4(MCV)X1(T/Motor)Pu(MCV)L RM1PuPc42Pb3Pd41DR1Pb21Pb20Pa20Pb1Pa1T1Pc3Pa21V3Pd2D2C2Pc1D1C1Pd1AiB4B5A5Pa5Pb5Pa4Pb4C5D5D4C4Pc40Pd40DR3Pc5Pd5RsC6D6P03PSP1P2P3P0PattP02Pn1Pi1(Pump)Pi2(Pump)Pn2PSPSPd6Pc6PSPc2P05PuoPc41DR5DR2DR4DR0ARM 1BOOM 2SWINGTRAVELOPT-CBOOM 1ARMREGENBUCKETOPT-BDOZERARM 2P1P4P3P2PO(MCV)PG(S/M)LINE FILTERSWING MOTORSHA(ccw)DrB(cw)PGPSSH(S/Motor)DOZER/ OUTRIGGER CYLINDERPILOTPUMPHYDRAULIC TANKDR#, dr#A1PUMPA2PUMPP0417W93HC18 3-233-23SWING CIRCUIT OPERATIONSWING CIRCUIT OPERATIONSWING MOTOR DEVICESHPGDrGA GBAuB(cw) A(ccw)PARKING BRAKEMAKE UPPORT(Mu)TO / FROM MAIN CONTROL VALVEMAKE UP VALVEMOTOR BRAKE VALVEBRAKE OFFBRAKE ONANTI-INVERSION VALVEBRAKE RELEASE VALVEMOTOR BRAKE VALVEMOTOR BRAKE VALVEMotor brake valve for the swing motor limits to cushion the starting and stopping pressure of swing operation and controls the swing motor operating pressure.MAKE UP VALVEMAKE UP VALVEThe make up valves prevent cavitation by supplying return oil to the vacuum side of the motor.PARKING BRAKEPARKING BRAKEThis is function as a parking brake only when all of the RCV lever (except dozer lever and travel pedal) are not operated.PARKING BRAKE "OFF" OPERATIONPARKING BRAKE "OFF" OPERATIONThe parking brake is released by the pilot pressure oil from the pilot pump.When the RCV lever placed in the operating position, the pilot oil flows into SH port through the MCV. This pressure transferred to the brake release valve and the brake release valve is change over. Then the pilot oil pressure PG lift the brake piston and release the parking brake.PARKING BRAKE "ON" OPERATIONPARKING BRAKE "ON" OPERATIONWhen all of the RCV lever placed in the neutral position, the pressure of the pilot oil passage down.Then the brake release valve returned to the neutral position and the oil is returned from the brake piston to the tank. And the brake is set to 'ON".ANTI-INVERSIONANTI-INVERSION VALVE VALVEThis anti-inversion valve absorbs shocks produced as swing motion stops and reduced oscillation cause by swing motion.1)1)2)2)3)3)4)4)14W93HC18A [...]... Pb5 Pa5 SWING MOTOR BUCKET OPT-B DR5 C4 P05 P04 D4 DR3 B4 Pc41 Pb4 Pa4 Pd40 Pc40 ARM 1 Pc42 V3 ARM REGEN Pc3 Pb3 Pd41 DR2 Pa21 P BOOM 2 C2 T2 TRAVEL CONTROL VALVE TRAVEL PILOT AC1 SOLENOID M2 ACC1 ACC1GP D2 BRAKE VALVE ACC2 DR1 SWING DR4 K P P P03 CT4 T T3 P1 MAKE UP VALVE CT2 D1 P0 CT3 T4(TGP) dr2 dr3 PS Ai OPT-C T1 P3 P2 P T P T ARM BUCKET P T BOOM A1 T (3) (2) (4) (3) (1) (2) A2 MAIN PUMP PS 2 1 Pu... BR1 BR2 M ARM 2 DR1 SWING DR4 P02 Patt M1 K P P TP P03 CT4 T T3 P1 BOOM 1 CT2 D1 Pc1 Pd1 CT1 P0 CT3 PGP P T4(TGP) dr2 dr3 PS Ai OPT-C T1 P3 P2 ACCELERATOR PEDAL P T P T ARM BUCKET P T BOOM A1 T (3) (2) (4) (3) (1) (2) A2 MAIN PUMP PS 2 1 Pu DOZER LEVER P Pc1(FW) Pd1(BW) (1) P1 RCV LEVER(RH) RCV LEVER(LH) SWING PS Pa1 TRAVEL DR0 SH (S/Motor) Pb20 Pa20 B1 A1 Pb1 C1 B T A2 Pb21 PS Pn2 (MCV) (4) Pi2 Pc6... SWING MOTOR BUCKET OPT-B DR5 SPOOL C4 P05 P04 D4 DR3 B4 Pc41 Pb4 Pa4 Pd40 Pc40 ARM 1 Pc42 V3 ARM REGEN Pc3 Pa21 BOOM 2 C2 P T2 ACC1 ACC1GP AC1 M2 D2 BRAKE VALVE ACC2 B2 Pc2 Pd2 BR1 BR2 M ARM 2 DR1 SWING DR4 K P P P02 Patt CT4 T T3 P1 BOOM 1 P03 CT2 D1 Pc1 Pd1 CT1 P0 CT3 PGP P T4(TGP) dr2 dr3 PS Ai OPT-C T1 P3 P2 ACCELERATOR PEDAL P T P T ARM BUCKET P T BOOM A1 T (3) (2) (4) (3) (1) (2) A2 MAIN PUMP PS... BUCKET OPT-B DR5 C4 P05 P04 D4 DR3 B4 Pc41 Pb4 Pa4 Pd40 Pc40 ARM 1 Pc42 V3 ARM REGEN Pc3 Pb3 Pd41 DR2 Pa21 P BOOM 2 C2 T2 ACC1 ACC1GP AC1 M2 D2 BRAKE VALVE ACC2 B2 Pc2 Pd2 BR1 BR2 M ARM 2 DR1 SWING DR4 P02 Patt M1 K P P TP CT4 T T3 P1 BOOM 1 P03 CT2 D1 P0 CT3 RAM LOCK SOLENOID Pc1 Pd1 CT1 PGP P T4(TGP) dr2 dr3 PS Ai OPT-C T1 P3 P2 ACCELERATOR PEDAL P T P T ARM BUCKET P T BOOM A1 T (3) (2) (4) (3) (1) (2)... will happen to the travel motor is prevented by the make-up valve in the main control valve 3-2 4 TRAVEL CIRCUIT OPERATION TRANSMISSION T U X2 T G X1 M2 M3 MA MB OVERLOAD RELIEF VALVE Gext COUNTER BALANCE VALVE A(fw) S B(bw) TURNING JOINT TO/FROM MAIN CONTROL VALVE 14W93HC19A Valves are provided on travel motor to offer the following functions 1) COUNTER BALANCE VALVE When stopping the motor on a slope... DOZER LEVER P Pc1(FW) Pd1(BW) (1) P1 RCV LEVER(RH) RCV LEVER(LH) SWING PS Pa1 TRAVEL DR0 SH (S/Motor) Pb20 Pa20 B1 A1 Pb1 C1 B T A2 Pb21 M1 TP Pb3 Pd41 DR2 GEROTOR PS Pn2 (MCV) (4) Pi2 Pc6 c Pd2 Pc3 d1 PS Pa5 Pc2 Pd40 Pc40 Pb5 Pd6 Pi1 Pn1(MCV) h1 PS Pa20 Pb20 DR#, dr# PS P1 ENG PO3 (MCV) Pb4 (MCV) X1 (T/Motor) Pu (MCV) T2,T3,T4 P4 PG(S/M) P3 HYD TANK B1 P1 P2 PO(MCV) PS P2 T(dr1) S2 P1 S1 B3 A3 LINE FILTER... (MCV) T2,T3,T4 P4 PG(S/M) P3 HYD TANK B1 P1 P2 PO(MCV) PS P2 T(dr1) S2 P1 S1 B3 A3 LINE FILTER POWER TRAIN PUMP 17W93HC20 When the brake pedal (valve) is pushed, the discharged oil from the power train pump (P2) flows into the front and rear axle brake disc through the solenoid valve of brake supply valve This pressure is applied to axle brake disc, thus the brake is applied 3-2 6 12 STEERING CIRCUIT... PS 2 1 Pu DOZER LEVER P Pc1(FW) Pd1(BW) (1) P1 RCV LEVER(RH) RCV LEVER(LH) SWING PS Pa1 TRAVEL DR0 SH (S/Motor) Pb20 Pa20 B1 A1 Pb1 C1 B T A2 Pb21 PS Pn2 (MCV) (4) Pi2 Pc6 c Pd2 Pc3 d1 PS Pa5 Pc2 Pd40 Pb5 Pa20 Pc40 Pd6 Pi1 Pn1(MCV) h1 PS Pb20 DR#, dr# PS P1 ENG PO3 (MCV) Pb4 (MCV) X1 (T/Motor) Pu (MCV) T2,T3,T4 P4 PG(S/M) P3 HYD TANK B1 P1 P2 PO(MCV) PS P2 T(dr1) S2 P1 S1 B3 A3 LINE FILTER 17W93HC22... or right hand direction : Because the spool is connected with steering column At this time, the oil discharged from the power train pump (P1) flows into steering cylinder through spool and gerotor within the steering valve Then the steering direction is applied 3-2 7 13 RAM LOCK CIRCUIT OPERATION ARM CYLINDER DOZER/ OUTRIGGER CYLINDER OSCILLATING REAR AXLE CYLINDER FRONT AXLE BUCKET CYLINDER BOOM CYLINDER... Pc1(FW) Pd1(BW) (1) P1 RCV LEVER(RH) RCV LEVER(LH) SWING PS Pa1 TRAVEL DR0 SH (S/Motor) Pb20 Pa20 B1 A1 Pb1 Pc1 Pd1 CT1 PGP P ACCELERATOR PEDAL P02 Patt BOOM 1 C1 B T A2 Pb21 M1 TP B2 Pc2 Pd2 BR1 BR2 M ARM 2 PS Pn2 (MCV) (4) Pi2 Pc6 c Pd2 Pc3 d1 PS Pa5 Pc2 Pd40 Pc40 Pb5 Pd6 Pi1 Pn1(MCV) h1 PS Pa20 Pb20 DR#, dr# PS P1 ENG PO3 (MCV) Pb4 (MCV) X1 (T/Motor) Pu (MCV) T2,T3,T4 P4 PG(S/M) P3 HYD TANK B1 P1 . RM1PuPc42Pb3Pd41DR1Pb21Pb20Pa20Pb1Pa1T1Pc3Pa21V3Pd2D2C2Pc1D1C1Pd1AiB4B5A5Pa5Pb5Pa4Pb4C5D5D4C4Pc40Pd40DR3Pc5Pd5RsC6D6P03PSP1P2P3P0PattP02Pn1Pi1(Pump)Pi2(Pump)Pn2PSPSPd6Pc6PSPc2P05PuoPc41DR5DR2DR4DR0ARM 1BOOM 2SWINGTRAVELOPT-CBOOM 1ARMREGENBUCKETOPT-BDOZERARM 2P1P4P3P2PO(MCV)PG(S/M)LINE. motion stops and reduced oscillation cause by swing motion .1)1 )2)2)3)3)4)4)14W93HC18A 3-2 4 3-2 4When the RH multifunction switch is placed in forward or