Hydraulic Circuit Diagram PC1250-8R PDF [PDF]

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HYDRAULIC SYSTEM PC1250-8R



S07



S03



S05



S10



R. H. TURN



L. H. TURN



ARM B



ARM H



S06



S08



P3



B2



A3



B3



A4



BACK PRESSURE COMPENSATING VALVE Pc = 0.47 MPa {4.8 kg/cm2}



B4



CU



CUSHION



T 1.96 MPa {20 kg/cm2}



BOOM CYLINDER 225 X 160 - 2390



CU



R VALVE (4 WAYS+1)



B



Nc BR



DUMP (PULL)



ARM HIGH



DUMP



BUCKET LOW



LOWER



BOOM LOW



REAR



R.H TRAVEL



P



B



A2



DIG (PUSH)



S02



PS



DIG (TILT)



S04



B1



RAISE



S13



A1



FRONT



P4



S12



BACKHOE SPECIFICATION BACK PRESSURE 0.88 MPa 9 kg/cm2



P1



S11



A



LINE FILTER



REAR



P2



FRONT



RAISE



DUMP



P2



REAR



P1



FRONT



P4



LOWER



P3



DIG (TILT)



P2



DUMP (PULL)



P1



DIG. (PUSH)



L. H



R. H



P3 P4



S01



P



33.3 MPa {340 kg/cm2}



35.8 MPa {365 kg/cm2}



14.7 MPa {150 kg/cm2} 33.3 MPa {340 kg/cm2}



Ps = 31.4 MPa {320 kg/cm2} 34.3 MPa {350 kg/cm2}



T



BUCKET B



BOOM SHAKE DAMP VALVE



BUCKET H



BOOM



R. H. TRAVEL



BOOM B



BUCKET



ARM



L. H. TRAVEL



BOOM H



PPC VALVE (FOR THE ROTATIAON OF THE WORK EQUIPMENT ROTATION



R. H. TRAVEL (REVERSE) L. H. TRAVEL (FORWARD) L. H. TRAVEL (REVERSE)



A



PRESSURE SWITCH



PPC VALVE FOR TRAVELLING



(R. H. LEVER



(L. H. LEVER)



R. H. TRAVEL (FORWARD)



SN : 35001 and up



CU



CU



ARM CYLINDER 225 X 160 - 2390



Nc AR



P1



No. 1 MAIN PUMP HPV95+95+SAL14 Pd21 Pd22



PA2



PSV MPELLER PUMP



NC VALVE



Pt



Pd



L VALVE (5 DIRECTIONAL CONTROL) PB1



FOR SWING PRIORITY VALVE



BOTTOM



P. T. O P T O COOLER



P



PA1



PA2



PSV



Pd22



PTO LUBRICATION STRAINER



PAG



PA2



PB3



SOLENOID VALVE ASS’Y F PUMP



R PUMP



A1



BOOM HEAD, FOR 2 STAGE SAFETY VALVE (FOR MACH NE PUSH UP) FOR TRAVEL SPEED (Hi / Lo)



PSV



SERVO VALVE Pecn



Pt NC VALVE Pe



Pec



CO VALVE



Pd12



Pecn



SERVO VALVE



SOLENOID VALVE ASS’Y



PcF Pd



RELIEF VALVE Pc = 0.15 ± 0.03 MPa {1.53 ± 0.3 kg/cm2} RETURN FILTER



Pd2 Pc



G MOTOR FOR AFTERCOOLER Pc = MIN 13.2 MPa {135 kg/cm2} PR = 18.1-0 5 Mpa {185-5 kg/cm2} P



ED30



Pen



MAX



PA



B1



A2



B2



A3



B3



A4



T



B4



A



PA1



PB2



PA2



PB3



T



PA3



CT OPT



H



1



2



PILOT FILTER



RELIEF VALVE A. PILOT RELIEF VALVE



T A B



P1 REVERSE



BACK PRESSURE COMPENSATING COMPENSATING VALVE Pc = 0.61 MPa {6.22 kg/cm2}



D



STD BUCKET CYLINDER 160 X 115-1825



CRACKING PRESSURE 0.01-0.03 MPa {0.1-0.31 kg/cm2} SAFETY VALVE Ps = 34.3 MPa {350 kg/cm2}



F



Dr (R)



(CHASSIS FRONT SIDE)



1.96 MPa {20 kg/cm2}



Pi



(R. H : TRAVEL MOTOR)



MB



HIGH-LOW SWITCHING PRESSURE 28.4 MPa {290 kg/cm2}



(L. H)



PB4



S



Nc B



B



MA



Nc A



REVERSE P2



T



(R. H)



P1



FORWARD



(CHASSIS REAR SIDE)



PA4



MB



(L. H : TRAVEL MOTOR)



(L. H)



MA



(R. H)



COUNTER BALANCE VALVE SWITCHING PRESSURE 1.0 MPa {10.2 kg/cm2}



Dr (L)



G



B



Pi



T



(PLUS CONTROL VALVE) (L.H. CONTROL VALVE) (R.H. CONTROL VALVE)



P1



ACC Pg = 1.18 Mpa {10 kg/cm2}



T A B



TRAVEL MOTOR



S



P5 = 2.94 Mpa {30 kg/cm2} BACK PRESSURE 0.88 Mpa {9 kg/cm2}



D C P



FORWARD P2



Pi



T



PB1



D C P



PILOT VALVE



P



MAX



MIN



E010



T Tc PUMP FOR OIL COOLER & RADIATOR



BACK PRESSURE COMPENSATING VALVE Pc = 0.4 MPa {4.4 kg/cm2}



VALVE A Pc = 0.03 MPa {0.3 kg/cm2}



HYDRAULIC TANK



PM PEPB



SE BUCKET CYLINDER 160 X 115-1950



B5



N2 N2



PEPC Ps



Nc BL



PA. B



PSG



MIN



Nc AL



E



33.3 MPa {340 kg/cm2}



VALVE A Pc = 0.03 MPa {0.3 kg/cm2}



PAG



Pd1



33.3 MPa {340 kg/cm2}



B4 A5 33 3 MPa {340 kg/cm2}



P



SAFETY VALVE SAFETY VALVE 2 2 SUCTION Pc = 0.005 MPa {1 53 kg/cm } SUCTION Pc = 0.002 MPa {0 02 kg/cm } EXHAUST Pc = 0 1 Mpa {0 173 kg/cm2} 2 EXHAUST Pc = 0 1 MPa {1 kg/cm } (CLOCKWISE ROTATION)



A4



B3



DIG (PUSH)



F



A1



FOR SWING PARKING BRAKE



A3



DIG. (TILT)



P TC



Cu



CENTER SWIVEL JOINT



R. H



Pd11



Cu PA5



1.96 MPa {20 kg/cm2}



33.3 MPa {340 kg/cm2}



L. H



PS



3rd VALVE (4 DIRECTIONAL CONTROL)



B2



33.3 MPa {340 kg/cm2}



SWING



(COUNTER CLOCKWISE ROTATION)



BOOM PLUS



T



R PUMP



Ps = 31.4 MPa {0.3 kg/cm2} 34.3 MPa {350 kg/cm2}



F PUMP



A2



BUCKET PLUS



Pecn



PA2



B1



33.3 MPa {340 kg/cm2}



FOR 2 STAGE RELIEF VALVE (FOR HEAVY LIFT)



SERVO VALVE



Pecn



Ps = 31.4 MPa {320 kg/cm2} 34.3 MPa {350 kg/cm2} BACK PRESSURE 0.88 MPa {9 kg/cm2}



SERVO VALVE



IMPELLER PUMP



Cu



FOR CUT OFF CANCEL



FOR TRAVEL STRAIGHT VALVE



PA1



PB5



Cu



T



PS



FAN MOTOR FOR OIL COOLER & RADIATOR SAFETY VALVE CRACK PRESSURE 24.5+0 5 KPa {250+5 kg/cm2} RELIEF PRESSURE MAX 30.9 KPa {315 kg/cm2}



P1



PSG



RAISE



(COUNTER CLOCKWISE ROTATION)



PA4



BACK PRESSURE 0.88 MPa {9 kg/cm2}



No. 3 MAIN PUMP HPV160+160



PB4



PA3



ARM PLUS



Pd12 Pd11



Pd21



IMPELLER PUMP



E



PB2



CLOSE



No. 2 MAIN PUMP HPV95+95



PA1



REVERSE



SOLENOID VALVE ASS’Y



TRAVEL L.H



P3



DIG. (TILT)



Pe TVC VALVE



Pd



DIG. (PUSH)



CO VALVE



Pec



PCR



Pd



D



PA4



DUMP (PULL)



CO VALVE



UNDER ELECTRONIC OLSS SPECIFICATION (2 MODES)



PB4



C



LOWER



SAA6D170E



Pecn PCF



PA3



SERVO VALVE



Pecn Pec



PB3



PSG



SERVO VALVE



Pt



PA2



SAFETY LOCK VALVE



R PUMP



PS



NC VALVE



PA1 PB2



OPEN



(COUNTER CLOCKWISE ROTATION)



P2



PB1



ARM LOW



F PUMP



C



PT Pp



PAG



RAISE



PA1



BOOM HIGH



Pd12 Pd11



BODY POPPET



STRAIGHT TRAVEL CONTROL VALVE



SUCTION STRAINER



3



CARTRIDGE DRAIN FILTER PC = 0.10 MPa



OIL COOLER



RETURN FILTER&SHORT PASS VALVE ASS’Y PC = 0.39 Mpa {4 kg/cm2}



FILTER



4



SWING MOTOR SAFETY VALVE SET PR = 27.0+0 5 MPa {275+5 kg/cm2} PR = MIN 20.6 Mpa {210 kg/cm2}



SHUTTLE VALVE



FILTER



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H



JOKOWI 7



Copy Right



: KOMATSU Shop Manual PC 1250-8R



Drawing Name :



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HYDRAULIC CIRCUIT DIAGRAM