Hyundai Manual (EN)

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SECTION 3 HYDRAULIC SYSTEM SECTION 3 HYDRAULIC SYSTEM Group 1 Hydraulic Circuit - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1 Group 2 Main Circuit - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-3 Group 3 Pilot Circuit - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-6 Group 4 Single Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-11 Group 5 Combined Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-23

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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 SOLENOID VALVE 8 TURNING JOINT 9 BUCKET CYLINDER ASSY 10 BOOM CYLINDER ASSY 11 DOZER CYLINDER ASSY 12 ARM CYLINDER ASSY 13 BOOM SWING CYLINDER ASSY 14 TERMINAL ASSY 15 RADIATOR TOTAL ASSY 16 RETURN CHECK VALVE 17 RETURN FILTER 18 SUCTION STRAINER 19 HYD TANK 20 STOP VALVE (LH) 22 RCV PEDAL-OPT 23 RCV PEDAL-TRAVEL 24 RCV DOZER 25 3 WAY VALVE 26 SOLENOID SELECTOR 27 FRAME EXTENSION CYLINDER 29 BLOCK(A) 32 PRESSURE SWITCH 33 SHUTTLE VALVE 34 RETURN PIPE ASSY 35 STOP VALVE(RH) 37 TERMINAL ASSY 30MJ-00001-01 1OF2 13 4 11 27 26 ( ,A1) 2 ( ,B1) 2 [DOZER UP] [DOZER DOWN] C1 C4C2 C3 DR1 DR2 A(BW) B(FW) P1 P2 RH R E D .

( ,A6) 2 ( ,B6) 2 E G H B5 2 Pb8' P2 P1 Pa6 Pa7 Pa4 Pa5 AC Pa3 Pa2 Pb2 RH IN OUT OUT IN 4 1 3 D E A 2 ( ,Pb2) 2 ( ,Pa2) 2 ( ,Pa4) 2 ( ,Pb4) 2 26 P3 A6 B6 A3 B3 A4 B4 A2 B2 A5 B10 A10 B7 A7 A9 B8 P T P ( ,T2) 29 ( ,P3) 29 22 24 1 2 P T P T P T ( ,P4) 29 ( ,T4) 29 [BM SWING L] [ARM IN] [BOOM UP] ( ,1) 22 BS ( ,2) 22 [BM SWING R] 5 6 29 BUCKET ARM 1 3 2 ( ,F) 37 ( ,Pb10) 2 DR ( ,T2) 29 ( ,Pa5) 2 ( ,Pb5) 2 RH B/SWING 1 2 ( ,T) 8 PP B(CW) A(CCW) [SWING RH] SWING Pb10 Pb8 T2 Pb6 Pb7 Pb4 Pb5 T1 Pb3 [SWING LH] ( ,1) 6 ( ,Pa3) 2 ( ,Pa10) 2 LH ( ,J) 37 ( ,D) 14 ( ,1) 5 ( ,D) 34 ( ,T) 3 F J 2 1 ( ,Pa1) 2 ( ,Pb1) 2 ( ,P2) 29 ( ,T3) 29 ( ,P) 23 R E D ( ,T2) 2 ( ,P2) 1 ( ,P1) 1 ( ,P3) 1 MRV-P3 ( ,P2) 7 SWING ( ,P5) 29 37 DOWN UP 3-1 T ( ,A) 34 ( ,Pb5) 2 ARM CROWD Pp1 ( ,Pa8) 2 LH ( ,Pb3) 2 3 BU ( ,A) 14 ( ,2) [RCV-PEDAL] 22 ( ,Pa6) 2 ( ,Pb6) 2 ( ,Pa7) 2 B ( ,C) 34 [RCV-PEDAL] 22 (BREAKER) ( ,1) PTO (BREAKER) [BW] [FW] [BW] [FW] 2 4 3 1 25 P T ( ,P4) 29 ( ,T4) 29 33 b2 a2 (BREAKER) 20 35 23 R/H L/H a1 b1 [ARM OUT] ARM ( ,AC) 2 [ARM IN] ( ,PP) 3 32 ( ,E) 14 ( ,Pb7) 2 ( ,C) 8 ( ,A) 8 [RH(BW)] ( ,3) 23 TRAVEL(RH) ( ,4) 23 ( ,2) 23 [RH(FW)] ( ,T) 6 ( ,P) 5 ( ,P) 6 9 10 12 ( ,T) 23 ( ,T) 22 T2 T3 T4 T5 P2 P3 P4 P5 ( ,P) 22 ( ,P) 23 ( ,T1) 29 MRV-P2 Dr1 ( ,DR2) 2 ( ,Dr1) 2 ( ,T) 24 ( ,T) 5 ( ,P) 8 SAFETY 2-SPEED ACC A1 A2 T TR MRV-P1 ( ,T3) 29 ( ,Dr) 3 ( ,P) 24 [LH(BW)] TRAVEL(LH) [LH(FW)] ( ,T) 7 T1 P1 K1 K2 K4 P1 P2 P3 P4 ( ,D) 8 ( ,B) 8 ( ,1) 23 34 7 ( ,P1) 2 ( ,P2) 2 ( ,P3) 2 ( ,Pb8') 2 [BOOM DOWN] K3 P2 ( ,pp1) 2 P1 S1 GROUP 1 HYDRAULIC CIRCUIT GROUP 1 HYDRAULIC CIRCUIT ( ,BU) 2 Pa8 BOOM ( ,B) 14 ( ,DR1) 2 1 1.

HYDRAULIC CIRCUIT (1/2) 1. HYDRAULIC CIRCUIT (1/2) ( ,Pb8) 2 DR2 E [BUCKET OUT] ( ,F) 37 Pa10 ( ,3) 6 [BUCKET IN] 15 16 19 17 BUCKET 18 A B C ( ,B) 25 D ( ,T1) 2 ( ,T) 3 E B(FW) DR B 10 A 10 BUCKET A 10 BUCKET Pa10 Pb8' DR2 Pa8 A9 B8 B7 Pa7 P1 A7 P2 Pa6 A6 Pa5 B6 A5 Pa4 B5 A4 B AC P3 Pa3 4 B3 A3 ARM SWING CROWD MRV-P3 BOOM TRAVEL(LH) TRAVEL(RH) MR M ARM PTO V-P2 RV-P1 MRV-P3 Pb10 T2 Pb8 Pb7 Dr1 Pb6 Pb5 Pb4 T1 Pb3

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1 MAIN PUMP 4-2 TRAVEL MOTOR 5 RCV LEVER-LH 5-2 RCV LEVER-LH 6 RCV LEVER-RH 6-2 RCV LEVER-RH 7 SOLENOID VALVE 21 SOLENOID VALVE 30 ACCUMULATOR 31 LEVER PATTERN VALVE 38 2 EPPR VALVE 30MJ-00001-01 2OF2 0.35L 7 SAFETY DR1 DR2 A(BW) B(FW) ACC R/H R E D . 30 K3 4-2 4-2 PP ( ,P4) 29 ( ,T4) 29 [INSTEAD OF RCV_2WAY, 22] PP [CLAMP] [RELEASE] ( ,Pa4) 2 ( ,Pb4) 2 A1 A2 P T A(FW) B(BW) DR2 L/H R E D .

5-2 6-2 38 DR1 BOOM SWING RH IN OUT UP DOWN OUT IN 4 1 3 P T P T LH RH RELEASE CLAMP 1 2 3 2 [INSTEAD OF RCV LEVER, 5-1, 5-2] BUCKET ARM RH IN OUT UP DOWN OUT IN 4 4 1 3 LH BOOM SWING P T P T ( ,BU) 2 ( ,Pb5) 2 BOOM DOWN J2-M2 J4-M4 BOOM UP 5 6 1 2 3 2 J1 J2 J3 J4 M1 M2 M3 M4 ISO A (LH LOCK) (RH LOCK) ARM OUT J1-M1 J3-M3 ARM IN ISO A BUCKET ARM ( ,Pa5) 2 ( ,Pb8) 2 ARM OUT J2-M1 J4-M3 ARM IN 31 BOOM DOWN J1-M2 J3-M4 BOOM UP 2. HYDRAULIC CIRCUIT (2/2) 2. HYDRAULIC CIRCUIT (2/2) P4 P3 P2 P1 [LH,RELEASE] [RH,CLAMP] ( ,C) 34 S1 LH A B P T 1 21 OUT UP DO R/H R E D . PP A(BW) B(FW) DR2 D DR2 D B(FW) J1 J2J3 J 4 4 M1 M2 M3 M DR2 B(BW)

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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 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

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