BAIC HX300HD Hydraulic System Service Manual PDF Download (EN)

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 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-14 Group 5 Combined Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-24

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GROUP 1 HYDRAULIC CIRCUIT GROUP 1 HYDRAULIC CIRCUIT SECTION 3 HYDRAULIC SYSTEM SECTION 3 HYDRAULIC SYSTEM 9 8 11 10 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) ( ,P04) 2 ( ,h) 25 [BOOM UP] [ROD] [HEAD] ( ,PaL) 2 ( ,P02) 2 ( ,PDb2) 2 [BUCKET OUT] [BUCKET IN] [BOOM DOWN] ( ,C) 12 ( ,D) 12 ( ,A) 12 [ROD] [HEAD] ( ,PAb1) 2 ( ,PDa) 2 ( ,PAb1) 2 [BOOM UP] ( ,g) 25 ( ,f) 25 [ARM IN] ARM 2 (ARM OUT) (ARM REGEN CUT) (BREAKER) (UNLOCK SIGNAL) ( ,j) 25 [LH-BW] [LH-FW] ( ,PCbc) 2 (ARM IN) Bb Ab ( ,1) 7 ( ,2) 7 Bk Ak P04 PBk PAk PBa2 PAa2 DR6 P02 Bbk PBa PBrc PAbk DR4 DR2 PbL PBb1 PAb1 Btr Atr PBtr PAtr 2 ARM REGEN BUCKET BOOM BOOM 1 Cck BbkR LCbk CRb ( ,Pi1) 1 Pn1 Pn2 NRV2 NRV2 NRV1 NRV1 LCk2 LCk1 LCa2 BbR AbR LCb1 ( ,Pi2) 1 BkR AkR LCar BtR AtR P5 P4 Rs ( ,MU) 3 CoR DoR DaR BOOM 2 SWING P/R [S/M MAKE UP] BC1 BC2 Cco LCo CaR LCa1 Ccb LCs 1 OPTION ARM 1 SWING (LEFT) TRAVEL TS TS P1 3-1 CRa Pi1 27 ( ,Pn2) 2 PS 20 23 16 ( ,PAk) 2 Ca Da DR7 PaL PCa PDa PCsp Cs Ds PCs PDs DR5 P03 DR3 DR1 PS P01 14 13 PCbc [BUCKET CONF.] PDbc [OPTION CONF.] DR9 Co P05 Do PDo PCo ( ,c) 25 PDb2 ( ,VA) 3 ( ,VB) 3 ( ,a) 25 ( ,b) 25 Ctl PCtl Dtl ( ,3) 7 ( ,4) 7 PDtl Ptr ( ,P4) 21 Patt PS 15 18 [BUCKET IN] [UNLOCK SIGNAL] ( ,PAa2) 2 [SWING PRIORITY] ( ,PAb1) 2 [SWING CCW] [SWING CW] (BOOM PRI.) [RH-BW] [RH-FW] 24 24 19 [HEAD] [ROD] ( ,d) 25 [BOOM UP PILOT] ( ,A5) 21 DR#,dr# 21 17 ( ,PBa) 2 [ARM OUT] ( ,B) 12 Dr MA ( ,e) 25 ( ,P2) 21 VB(FW) VA(BW) ( ,Atr) 2 ( ,Btr) 2 ( ,Ctl) 2 ( ,Dtl) 2 ( ,A3) 21 [ARM IN] [TRAVEL] (3) (4) (1) (2) ( ,PCtl) 2 [RH-BW] 34 P T 4 4 REG REG 12 P T ( ,PAtr) 2 ( ,PDtl) 2 [RH-FW] A1 A2 FC1 FC2 ( ,2) 34 ( ,P01) 2 ( ,Psv) 1 ( ,A3) 1 C A D B Dr P ( ,A1) 21 ( ,PBtr) 2 [LH-BW] R/H L/H Ps MB 7 26 6 26 5 26 [LH-FW] ( ,P) 7 ( ,P) 6 ( ,P) 5 Ps MA 24 24 24 24 [BOOM DOWN] ( ,PG) 3 P1 VA(FW) VB(BW) [SWING] [ARM] [BUCKET] [BOOM] a b d e f g h j e1 e2 h1 h2 d1 PS PS PS ( ,PBb1) 2 P4 P3 P2 (1) (3) (2) (4) (3) (1) (2) (4) A B E D H J F G PS ( ,PAb1) 2 [BOOM UP] A1 A2 A3 ( ,A1) 21 ( ,A1) 21 P T P T ( ,PBk) 2 [BUCKET OUT] ( ,P3) 21 MB ( ,PAk) 2 [BUCKET IN] ( ,e1) 25 PG ( ,RS) 2 60 59 ( ,PCa) 2 [ARM IN] ( ,P03) 2 ( ,P) 12 ( ,Pu) 2 SH MB MA MU PS ( ,PDa) 2 [ARM OUT] ( ,SH) 3 1.

HYDRAULIC CIRCUIT 1. HYDRAULIC CIRCUIT VB(CW) VA(CCW) ( ,Cs) 2 ( ,Ds) 2 R/G 24 ( ,PDs) 2 [SWING CW] A5 3 c ( ,PCs) 2 [SWING CCW] ( ,PCsp) 2 PS [SWING PRIORITY] AU DR 25 T SECTION 3 HYDRAULIC SYSTEM GROUP 1 HYDRAULIC CIRCUIT BC1 NR BC2 NRV1 V2 Cck Cco BkR CoR AkR DoR LCo LCk1 LCk2 CaR DaR OPTION OPTION BUCKET BbkR CRa ARM 1 LCa1 LCa2 ( ,PDa) 2 PAa2 (ARM OUT) DR6 P02 ARM 2 Ccb LCar SWING P/R BbR PBrc(ARM REGEN CUT) BOOM 2 ARM REGEN LCbk SWING AbR CRb BOOM 1 LCs LCb1 BtR AtR (LEFT) TRAVEL (RIGHT) TRAVEL M RV

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( ,PDbc) 2 [FLOW CONFLUX] [POWER BOOST] [PEDAL SAFTY] ( ,A1) 21 A2 A1 A3 T P1 BC1 BC2 Cco CoR DoR LCo 1 Main pump 2 Main control valve 3 Swing unit 8 Boom cylinder (LH) 9 Boom cylinder (RH) 10 Arm cylinder 13 Check valve 14 Check valve 16 Oil cooler 22 Pressure sensor 24 Pressure sensor 26 Last guard filter 30 Boom safety lock valve (LH, option) 30 Boom safety lock valve (RH, option) 31 Arm safety lock valve (option) 32 Shuttle valve (option) 35 Accumulator (option) 36 Accumulator (option) 37 Stop valve (option) 39 2-way pedal (option) 40 3-way joint (option) 41 Solenoid valve (option) 44 Solenoid valve (option) 48 Solenoid valve (option) 50 Solenoid valve (option) 51 Solenoid valve (option) 58 2-EPPR valve (option) 68 Pattern change valve (option) 69 Gear pump (option) ( ,P05) 2 ( ,C) 32 24 P2 PS OPTION 58 41 2 A1 A2 P T 26 PDbc DR9 Co P05 Do PDo PCo ( ,A3) 41 32 ( ,A2) 41 30Q8-47101-00 2OF2 A C B 37 35 37 40 36 13 14 16 ( ,P2) 41 ( ,T1) 2 13 14 16 B C a3 A3 Dr B3 B1 22 56 MA MB 30 30 PS 1 69 B A 8 9 M LS A B E 57 T P 44 Pi1 Pi1 ( ,PBb1) 2 ( ,Bb) 2 ( ,Ab) 2 3 ( ,PDbc) 2 [FLOW CONFLUX] [POWER BOOST] [PEDAL SAFTY] ( ,A1) 21 A2 A1 A3 T P1 E Pi1 V2 ( ,P05) 2 ( ,C) 32 41 24 CoR DoR T 3-2 P2 PS BC1 BC2 Cco LCo 51 OPTION B1 B2 B3 ( ,PDs) ( ,PCs) ( ,SH) 3 2 2 A1 A2 A3 (Swing CCW) (Swing CW) 2 (1) ( ,A) 32 B1 T 36 40 37 37 35 39 [OPTION CONF.] ( ,A3) 41 ( ,A2) 41 B C A A1 32 ITEM PORT ITEM PORT PLl PLf PLr PLb A D B E PRr PRb PRl PRf G H F J FROM TO 68 25 68 25 ( ,2) 39 ( ,P2) 41 ( ,1) 39 1 2 3 4 sl ad 68 sr ac 1 2 3 4 vd bu 68 vc bd 13 14 16 10 ( ,Ca) 2 ( ,Da) 2 5 6 B C ( ,T1) 2 31 E T Pi1 V2 ( ,e) 25 (Td#) CoR DoR PLl PLr PLb PLf PRb PRf PRl PRr bd sr ( ,A2) 21 BC1 BC2 Cco LCo ad vd OPTION ac vc bu 2 sl 24 ( ,A1) 21 ( ,PDo) 2 A1 A2 PS T P 2.

HYDRAULIC CIRCUIT 2. HYDRAULIC CIRCUIT 50 PDbc DR9 Co P05 Do PDo PCo B T P A 37 35 37 2 48 CAT/JohnDeere/ISO/Hitachi ( ,T1) 2 14 13 16 ( ,A1) 50 V2 68 36 CoR DoR FROM TO ITEM PORT ITEM PORT 5 1 68 PLl 2 3 PLf PLr 4 PLb 68 sl ad sr 25 A D B 6 ac 1 2 68 E PRr PRb 3 PRl 4 PRf 68 vd 25 G bu H vc F bd J CAT/JohnDeere/ISO/Hitachi

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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 To cylinders To motors Main control valve To oil cooler To hydraulic oil tank Main pump Suction filter Hydraulic oil tank 3-02 The pumps receive oil from the hydraulic tank through a suction filter.

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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