Hydraulic System Service Manual: Hyundai Excavator — Circuit Diagrams (EN)

SECTION 3 HYDRAULIC SYSTEM SECTION 3 HYDRAULIC SYSTEM Group 1 Hydraulic Circuit - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1 Group 2 Main Circuit - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-2 Group 3 Pilot Circuit - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-5 Group 4 Single Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-14 Group 5 Combined Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-24

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1 Main pump 2 Main control valve 3 Swing motor 4 Travel motor 5 RCV lever(LH) 6 RCV lever(RH) 7 RCV pedal 8 Boom cylinder(LH) 9 Boom cylinder(RH) 10 Arm cylinder 11 Bucket cylinder 12 Turning joint 13 Check valve 14 Check valve 15 Hydraulic tank 16 Oil cooler 17 Air breather 18 Return filter w/bypass valve 19 Strainer 21 3-cartridge valve 22 Pressure sensor 23 Pressure sensor 24 Pressure sensor 25 Terminal block 26 Last guard filter 27 Pilot selector valve 28 Screw coupling 29 Tee shuttle 30 Cross assy 42 2-EPPR valve 43 Fan motor 44 Fan pump 45 Direction change valve 73 Solenoid valve 76 Shockless valve [Arm Out] [Head] [Rod] ( ,d) 25 27 [Boom Down] [Head] [Rod] [Bucket In] [Bucket Out] [Boom Down] [Boom Up] P A T [Td#] [Arm Out] ( ,d) 25 [Arm2 In] ( ,e) 25 ( ,f) 25 ( ,g) 25 ( ,j) 25 ( ,h) 25 Pi ( ,j) 25 ( ,D) 12 ( ,h) 25 [Td#] [Td#] [Td#] [Td#] pa10 B9 A9 pb9 pa9 B8 A8 pb8 pa8 DR2' DR2 pc2 A7 B7 pb7 DR4 pc7 pa7 B6 A6 pb6 pa6 ARM 2 BUCKET BOOM 1 43 45 44 ( -1,A(To X1,Upper Position)) 29 ( -2,B(To X1, Down Position)) 29 ps1 ps2 T3 T1 T2 T4 10 11 8 9 [P1 Pump] [P2 Pump] OPTION ARM 1 BOOM 2 SWING pa11 DR1 DR1' pc1 B5 A5 pb5 pa5 pb4 A4 B4 pa4 A3 B3 pb3 A2 B2 pa3 pb2 pa2 DR3 B1 pc6 3-1 [Bucket In/Out Shuttle] ( -3,c) 29 ( ,e) 25 [Arm Holding] ( ,d) 25 ( ,e) 25 ( ,h) 25 ( ,j) 25 ( ,a) 25 [Td#] ( ,b) 25 [Rod] [Head] [Arm Out] [Arm In] [Boom2 Up] [Boom2 Down] [SW-CCW] [SW-CW] [Boom Pri'] ( ,C) 12 Dr MA L2 L1 L P VA(FW) VB(BW) 12 ( ,A1) 2 ( ,B1) 2 ( ,B6) 2 x 4 4 L/H R/H C A D B ( ,A6) 2 ( ,A4) 21 [Td#] ( ,T) 6 ( ,T) 7 ( ,T) 5 T1 T2 T3 Ps Ps MB MA E F G ( ,Pa1) 2 [RH-BW] 30 T [Td#] [SWING] [ARM] [BUCKET] [BOOM] [TRAVEL] (1) (3) (2) (4) (3) (1) (2) (4) (3) (4) (1) (2) ( ,Pa6) 2 ( ,Pb1) 2 [RH-FW] ( ,Pa3) 2 [BOOM DOWN] ( ,Pc6) 2 [SWING LOGIC] ( ,P) 42 ( ,P) 6 P1 ( ,P) 7 P2 ( ,P) 5 P3 P VA(BW) VB(FW) ( ,T2) 30 ( ,P2) 30 P T ( ,Pb6) 2 [LH-BW] ( ,Pb3) 2 [BOOM2 UP] 5 6 26 7 26 26 [LH-FW] ( ,Pc2) 2 [BOOM HOLDING] ( ,Pb7) 2 [BOOM UP] A B T D P [Td#] Dr MB a b d e f g h j c f1 h1 j1 e2 PS PS PS PS 24 24 24 24 24 24 24 Pi ( ,P4) 21 ( ,A) 73 A B E F G H J D ( ,Pa7) 2 [BOOM DOWN] ( ,Pa11) 2 [BUCKET OUT] [BUCKET FLOW CONPLUX] G PG MA MU ( ,T3) 30 ( ,T1) 30 P T P T d1 g1 PS PS A C B 29 -3 ( ,Pi) 45 ( ,PP) 2 GROUP 1 HYDRAULIC CIRCUIT GROUP 1 HYDRAULIC CIRCUIT VA(CCW) VB(CW) ( ,P1) 30 ( ,P3) 30 ( ,Pa8) 2 ( ,Pb8) 2 [BUCKET IN] ( ,Pa5) 2 ( ,Pc1) 2 ( ,Pa9) 2 [ARM IN] [ARM HOLING] [ARM2 IN] B A P1 3 3 PS 13 16 L [Td#] P4 P3 P2 1.

HYDRAULIC CIRCUIT (1/2) 1.

HYDRAULIC CIRCUIT (1/2) AU DR MB ( ,Pb9) 2 [ARM2 OUT] 18 A5 A2 A1 TRAVEL SAFETY 2nd SPEED POWER BOOST PG AU 76 76 ( ,Pb2) 2 ( ,Pa2) 2 [SWING CCW] [SWING CW] 14 ( ,PH) 2 MA MU VA(CCW) VB(CW) ( ,Pb5) 2 [ARM OUT] dr# 19 ( ,F) 12 25 ( ,P) 27 [BOOM LOGIC] 17 15 Td# 21 DR MB T(dr1) [Td#] [P1 Pump] ( -1,A(To X1,Upper Position)) 29 ps1 T3 T1 [Bucket In/Out Shuttle] ( -3,c) pa11 29 DR1' DR1 [Td#] ( ,e) pc1 25 [Arm Holding] B5 [Rod] A5 [Head] [Arm Out] ( ,d) pb5 25 ARM 1 [Arm In] ( ,e) pa5 25 B4 A4 pb4 pa4 OPTION A3 B3 [Boom2 Up] ( ,h) pb3 25 ON EL(RH) TRAVEL(LH TRAVEL STRAIGHT PSPT PPPA PH 24 ( ,A2) 21 ( ,P3) 21 PS 24 26 PS 2 2 2 3 X1 R4 Vm Vm R1 gaxVgmin PS M M X3 PS 2 3 M3 PS 2 3 X2 26 2 2 2

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[Td#] 1 Main pump 2 Main control valve 3 Swing motor 8 Boom cylinder(LH) 9 Boom cylinder(RH) 10 Arm cylinder 13 Check valve 14 Check valve 15 Hydraulic tank 16 Oil cooler 17 Air breather 18 Return filter 19 Strainer 22 Pressure sensor 24 Pressure sensor 26 Last guard filter 28 Screw coupling 29 Tee shuttle (option) 30 Boom safety valve (option) 31 Arm safety valve (option) 32 5-shuttle valve (option) 34 2-way pedal (option) 37 Stop valve (option) 39 Proportional relief valve (option) 41 3-solenoid cartridge valve (option) 44 Solenoid valve (option) 46 Float cartridge valve (option) 48 Solenoid valve (option) 49 Solenoid valve (option) 51 Pattern change valve (option) 52 Solenoid valve (option) 54 Solenoid valve (option) 56 Proportional valve (option) 57 Gear pump (option) 58 2-EPPR valve (option) 61 Proportional relief valve (option) 65 Shuttle block (option) 66 Solenoid valve (option) 67 Cylinder (option) 69 Control valve (option) 70 Stop valve (option) 71 Solenoid valve (option) 72 Safety valve (option) 74 Solenoid valve (option) 75 Solenoid valve (option) ( ,P4) 21 ( ,A3) 41 ( ,A3) 66 In Case of 2-WAY OPTION In Case of 2-WAY+ROTATING +PEDAL OPTION pa10 Or ( ,A2) 54 ( ,P) 49 In Case of 1-WAY OPTION ps2 T4 Or In Case of Quick Coupler 2 [Td#] P A T 30KB-27100-03 2OF2 67 71 ( ,PG) 3 This 1-sol' valve in standard circuit must be removed in the option of "swing parking by force" (3-sol valve will replace 1-sol valve for the function.) V1 C1 C2 V2 ( ,A1) 21 A1 A2 A3 B1 B2 B3 ( ,Pa2) ( ,Pb2) 2 2 (Swing CCW) (Swing CW) ( ,PG) 3 ITEM PORT ITEM PORT J1 J3 J4 J2 D J E H ( ,4) ( ,1) ( ,3) 75 FL BL FR BR ( ,Pa1) 2 ( ,a) 25 ( ,b) 25 FROM TO 50 25 7 7 7 A1 A2 A3 A4 3 2 1 ( ,Pb6) 2 19є,EATON 19є,DAEHYUN 19є,EATON 19є,DAEHYUN 69 72 (DOWN) T (UP) 14 13 16 T 73 A P T 2 4 2 4 M1 M2 50 M3 M4 ( ,2) 3 2 1 ( ,Pa6) 2 ( ,Pb1) 2 NOTE A1 B1 52 [Td#] 5 6 7 ITEM OPT(1) PART NO.

31K9-21011/21 31K9-21410/20 EJA21 ERR01 31K9-21131/41 EJA01 EJA21 31K9-21430/40 P T B T P A J1 J2 J3 J4 M1M2 M3 M4 OPT(2) ERR00 EJA01 70 49 [Td#] In Case of Removeable counterweight ( ,P3) ( ,To STOP V/V) 70 51 5 / 6 ( ,P3) 2 2 [Boom Down] [Td#] ( ,j) 25 PS 22 MB MA MB MA 22 30 30 PS 48 P A T 14 13 16 ( ,e) 25 ( ,A5) 2 ( ,B5) 2 30 30 9 8 LC0 A2 T DR2' DR2 [dr#] pc2 A7 B7 pb7 pa7 E T 28 Pi1 Pi1 T ( ,j) 25 ( ,B7) 2 ( ,A7) 2 3 3 B A 2 46 22 PS G Boom 1 [Td#] 74 3-2 Pi1 V2 E Pi1 V2 Boom 2 31 T [Td#] A3 B3 pa3 pb3 E Pi1 V2 [Td#] [Td#] GA A3 34 41 26 24 26 29 G.P PS T P2 [FLOW CONFLUX] [BREAKER] [PEDAL SAFETY] ( ,C) 27 pa10 ( ,Pa10) 2 [Td#] [Td#] P1 ( ,A1) 21 pa10 ( ,A3) 41 ( ,Pa10) 2 T P1 ( ,A1) 21 ( ,A3) 66 A2 A1 ( ,C) 32 P2 PS 24 A2 A1 A3 T [FLOW CONFLUX] [BREAKER] [PEDAL SAFTY] 66 24 58 A2 B A3 [FLOW CONFLUX] [BREAKER] [PEDAL SAFETY] [EPPR SAFETY] pa10 Option ps2 T4 ( ,G) 65 P2 A1 A2 PS ( ,A1) 21 P1 [Td#] 2 2 44 2 Option A1 Option pa4 [Td#] P T (1) (2) A4 B4 pa5 pb4 32 pa4 A4 B4 pa5 pb4 pa4 2 pb4 A B C B1 B C A1 A B B1 C A1 A 32 [Td#] A B D C E A4 B4 pa5 B1 A1 ( ,P2) 41 14 13 16 58 A1 A2 P T 26 ( ,P2) 44 34 26 P T (1) (2) F H G R1 R3 ( ,P2) 66 37 37 T1 39 T1 P T 26 T A B A B T 29 [Td#] 61 37 37 14 13 16 65 14 13 16 T1 39 T A B A B T T1 [Td#] 37 37 39 [Td#] T1 T A B A B T T1 pa10 [Td#] 61 61 ( ,A1) 21 2.

HYDRAULIC CIRCUIT (2/2) 2. HYDRAULIC CIRCUIT (2/2) 2 Option A2 A1 26 T P [FLOW CONFLUX] [BREAKER] 1 M2 M2 A4 B4 pa5 pb4 [Td#] pa4 24 PS 17 18 19 57 1 18 T1 [Td#] A2 15 56 37 B A 37 A2 17 15 19 57 56 37 37 T A B 54 Vgmax Vgmin R1 R3 M LS Vgmax Vgmin B A 37 37 16 39 M LS 14 13 A3 T P A3 T P E E

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GROUP 2 MAIN CIRCUIT GROUP 2 MAIN CIRCUIT The main hydraulic circuit consists of suction circuit, delivery circuit, return circuit and drain circuit. The hydraulic system consists of one main pump, one control valve, one swing motor, four cylinders and two travel motors. The swash plate type variable displacement tandem axial piston pump is used as the main pump and is driven by the engine at ratio 1.0 of engine speed. 1. SUCTION AND DELIVERY CIRCUIT 1. SUCTION AND DELIVERY CIRCUIT To cylinders To motors Main control valve To oil cooler To hydraulic oil tank Suction strainer Main pump Hydraulic oil tank 140L3CI01 The pumps receive oil from the hydraulic tank through a suction strainer.

The discharged oil from the pump flows into the control valve and goes out the tank ports. The oil discharged from the main pump flows to the actuators through the control valve. The control valve controls the hydraulic functions. The return oil from the actuators flows to the hydraulic tank through the control valve and the oil cooler. 3-3 3-3

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