Shop manual máy đào HuynDai R250: An toan, cấu trúc, sơ đồ điện, thủy lực,
2-21GROUP 2 MAIN CONTROL VALVE(PSP)XBtlXBsXAa1XBp2XAtlXAsXAb2XBa1XBp1CMR2CMR1PzBtlBsSPHEADAa1Ck1Dr1FLFRCSPLCa1AtlAsCCb HVRODBa1Dr2R1PnsDr6TRAVEL(L)SWINGBOOM2ARM1PaLPns Dr6PaLCk1Dr3Dr2PGMRTSR1R2(P2)Dr4PbLCk2XAtrXAoXAb1 XBk XBa2TRAVEL(R)OPTIONBOOM1BUCKETARM2Dr4 PbLAtrCP2C2LCoLCb1LCkLCa2(Ao)HEADAb1HEADBk1RODBb1 Ak1RODPBPXBtr XBoXBb1 XAkXAa2Btr(Bo)Dr3FRCk1Ck2NR1BCA1SP(B2)STLA2BK B1 OP TRPBPFLAVIEW ACk1P2R2PyPHCk2Dr4P1Dr3PxP1TL S B2 A1 BCTR OP B1 BK A2C11. STRUCTUREPort size Tightening torqueMarkPort namePF 1PF 3/4PF 3/8PF 1/4M10M1220~25kgf・m(115~180lbf・ft)15~18kgf・m(109~130lbf・ft)7~8kgf・m(50.6~57.8lbf・ft)3.5~3.9kgf・m(25.3~28.2lbf・ft)5~6.6kgf・m(36.1~47.7lbf・ft)8.5~11.5kgf・m(61.5~83.1lbf・ft)R1Ck1Ck2XAtrXBtrXAoXBoXAkXBkXAb1XBb1XAa2XBa2XAtlXBtlXAsXBsXAa1XBa1XAb2(Psp)(XBp1)(XBp2)PzPyPGPHPxDr1Dr2Dr3Dr4Dr6FLFRPnsPaLPbLPBPAtrBtr(Ao)(Bo)Ak1Bk1Ab1Bb1AtlBtlAsBsAa1Ba1P1P2R2Make up port for swingBucket in confluence portBucket in confluence portTravel right pilot portTravel right pilot portOption pilot portOption pilot portBucket out pilot portBucket in pilot portBoom up pilot portBoom down pilot portArm in confluence pilot portArm out confluence pilot portTravel left pilot portTravel left pilot portSwing pilot portSwing pilot portArm in pilot portArm out pilot portBoom up confluence pilot port(Swing priority pilot port)(Bucket in confluence pilot port)(Drain port)Main relief pilot pressureSignal port for travelPilot pressure portPilot pressure portSignal for other acutuatorsDrain portDrain portDrain portDrain portDrain portNegative control signal port(P1 port side)Negative control signal port(P2 port side)Swing logic valve pilot portLock valve pilot portLock valve pilot portDrain portTravel motor right side portTravel motor right side portOption portOption portBucket rod side portBucket head side portBoom head side portBoom rod side portTravel motor left side portTravel motor left side portSwing motor portSwing motor portArm head side portArm rod side portPump port(P1 side)Pump port(P2 side)Return port29072MC01 2-22ABJAP1TLTRSOPB2B1A1BKBCA2159159159159273PzMRTSDr2NR2R2(P2)R1Dr3PaLPbLDr4Dr6PnsPxPGJFCGEDFGCDEHBHXAtlXAsXAb2XBtlXBs(PSP)(XBp2)103SSWINGB2BOOM 2A1ARM 1SPSWING PRIORITYP1TSSTRAIGHTTRAVELTLTRAVEL(L)391101561153XBa1(XBp1)XAa1II153TSMRPzCMR1CMR2324325391601338Ba1A1BCHVCCbB2A2BKB1Ab1Bk1B2A1BCB1BKA2Aa1Bb1Ak1J1561104XAtrXAoXAb1XAa2XBtrXBoXBb1XAkXBa2TRTRAVEL(R)OPOPTIONB1BOOM 1BKBUCKETA2ARM 2KLR2LP2KXBk974976975102164154K1158357NZyNZx357CS2CS1PGMNMNSECTION A-A SECTION B-BSECTION I-ISECTION H-HSECTION M-M SECTION N-N975101 Casing A102 Casing B103 Straight travel valve104 Boom priority valve153 Plug154 Plug155 Plug158 Plug159 Plug164 O-ring165 O-ring166 O-ring167 O-ring168 O-ring169 O-ring201 Cover202 Cover203 Cover204 Cover207 Cover209 Flange251 Control valve assy252 Lock valve assy254 Swing logic valve assy261 O-ring262 O-ring264 O-ring273 Socket screw301 Travel spool302 Arm 1 spool assy303 Boom 1 spool assy304 Bucket spool305 Swing spool306 Arm 2 spool307 Boom 2 spool309 Spool(Option)310 Travel spool324 Spring325 Spring328 Spring329 Spring331 Spring seat332 Spring seat333 Bolt334 Stopper335 Stopper336 Bolt337 Stopper338 Stopper339 Stopper357 Orifice370 Spring376 Spring379 Spring391 Straight travel spool392 Bypass cut spool395 Swing priority spool401 Spool424 Spring425 Spring438 Rod511 Poppet513 Poppet515 Poppet516 Poppet521 Spring522 Spring523 Spring551 Plug552 Plug553 Plug554 Plug555 Check valve assembly556 Plug561 O-ring601 Main relief valve602 Port relief valve611 Nega-con relief valve971 Socket screw974 Socket screw975 Socket screw976 Socket screw25072MC01 2-23C2164154521C2203333331334329328331262168164154301169202XAtr XAtlAtrBtrTR TLXBtr XBtl203333331334329328331262166165165515521551561310165169202203333331334329328331262553561971165209511521551561971165209309561553169202201336332335379370332261159166166165165254251165305264204XAoXAs159AoR(Ao)LCo(Bo)AsPnsBsXBsXBoBoROP S166379370332261159602159252165552523561516165551561511303165264602204201336332335207336332339379370332261307165561551521511561551521511551561395261332370376339332336207XAb1XAb2Ab1RB2Ab1LCbBbBb1RXBb1B1 SP(PSP)CCbCSPSP201332336335370379332261602166513522561554304602201332336335379370332261602252516523552561511521551561302264204602XBk XBa1BkRBa1RBk1Ck2Ak1HVLCa1Aa1AkRXAkBK A1XAa1Aa1R201336332335379370332261165551561306165203333331337329328331262392551561611165555611551169202264204XBa2XBp1Dr2NR2FRFLCk1XAa2A2 BCXBp2NR1561LCa2264204424425438401PP551 561 521 511551 561 521 511K1C1CP2P2L1155167P2CP2551561521511P2L1AtlBtlSECTION C-C SECTION D-D SECTION E-ESECTION F-FSECTION G-GSECTION J-J SECTION P-PSECTION K-KSECTION L-LSECTIONL1-L116625072MC02 2-242. HYDRAULIC CIRCUITXBp1XBp2Dr2FrFlBPPBPNR1 NR2BC1 BC2PaLHVDr1Aa1Ba1XAa1(HEAD)(ROD)ARM 1XBa1XAb2BOOM 2(PSP)PnsAsBsXBSSWINGXAsDr6AtlBtlXBtlXAtlTRAVEL(L)R1PHPxSTRAIGHTTRAVELBLOCKMRPz P1 PG PyP2 R2BaRAaRLCa1CCbCspSPLCsTSCMR1 CMR2CP2C2LCoC1LCb1LCkXBtrXAtrAtrBtrXBoXAo(Ao)(Bo)AoRBoRBbRHVAbRBkRAkRXBb1(HEAD)(ROD)XAb1Ab1Bb1PbLDr4XBkXAkAk1Bk1(ROD)XAa2XBa2ARM 2BUCKET(HEAD)BOOM 1OPTIONTRAVEL(R)Ck10.70.70.7XBp129072MC24 2-253. FUNCTIONCONTROL IN NEUTRAL POSITION1)XAtlXAsXAb2XBtlXBs(PSP)(XBp2)103SSWINGB2BOOM 2A1ARM 1P1TSSTRAIGHTTRAVELTLTRAVEL(L)101XBa1XBp1XAa12122134XAtrXAoXAb1XAa2XBtrXBoXBb1XAkXBa2TRTRAVEL(R)OPOPTIONB1BOOM 1BKBUCKETA2ARM 2R2P2XBk102K11864SECTION A-ASECTION B-B25072MC1029072MC26 2-26A2XAa2(XBp2)611611BCDr2LCa2NR2NR1(XBp1)(Ck1)XBa2FLFR413134ABJAP1TLTRSOPB2B1A1BKBCA2PZMRTSDr2NR2R2(P2)R1Dr3PaLPbLDr4Dr6PnsPxPGJFCGEDFGCDEHBHSECTION G-G29072MC2729072MC28 2-27The hydraulic fluid from the pump P1 flows into casing A(101) through the inlet port(P1), through thecenter bypass(21) and the parallel path(22). The hydraulic fluid from the pump P2 flows into casingB(102) through the inlet port(P2) through the center bypass(18) and the parallel path(6).The hydraulic fluid from the pump P1 is directed to the tank through the center bypass(21), negativecontrol orifice(NR1), the return path(13) and the return port(R2). The hydraulic fluid from the pumpP2 also flows to the tank through the center bypass(18), negative control orifice(NR2), return path(4) and return port(R2). The hydraulic fluid in paths (6) and (22) is blocked and cannot return to thetank.In case a control lever is operated, the hydraulic fluid from the pump P2 is supplied to the travel rightspool(301) from path(18) and to the spools: option(309), boom1(303), bucket(304) and arm2(306)from path(6). Additionally, the hydraulic fluid from the pump P1 is supplied to the travel left spool(310) from path(7) while the swing(305), boom2(307) and arm(302) spools are supplied frompath(22). 2-28NEGATIVE CONTROLGeneral operation2)(1)303 18 21 3 4 510761119 6 27 28 22 139611FlFrP2 P1The negative control signal pressure from the center bypass(18, 21) occurs in the following casesand controls the discharge of the pump.1. Neutral condition when no function is being actuated.2. The pilot control lever is partially operated. The hydraulic fluid of the pump P1(28) flows into the return passage(13) through the center bypass(21), the path(3) and orifice(9)(Within the poppet(15)). The restriction caused by this orifice therebypressurizes path(3). This pressure is transferred as the negative control signal pressure Fl to thepump P1 regulator through the negative control line(4). It controls the pump regulator so as todecrease the discharge of the pump P1(28). 29072MC29 2-2921131661115101BC NR1(XBp2)FlQQmaxQminFl1FlQNFlFl1The negative control relief valve(611) consists of poppet(15), spring(16) and casing(101). Whenthe hydraulic fluid in the center bypass increases to the level that the pressure in the path(3)reaches the set pressure of the spring(16), the hydraulic fluid in the path(3) pushes open the poppet(15) and escapes into the return path(13).In the unloaded state, the hydraulic fluid of the pump P1(28) entirely flows to the tank through thepath(21), orifice(9) and the return path(13). Therefore the pressure Fl in the path(3) becomesmaximum(Fl1) because all the discharge is reduced by the orifice(9) which in turn destrokes thepump P1(28) so as to minimize the tilting angle and consequent discharge of the pump P1(28).(Qmin)29072MC30 2-30Negative control(With fine metering)(2)B1XAb1XBb1Ab1Bb1LCb1Ab1RBb1R37937030351118 1946In the case, for example, when the pilot control lever for main boom is slightly operated, the pilotpressure XAb1 shifts the main boom spool(303) partially in the left direction. So the path(19) ispartially opened and the center bypass(18) is shut slightly. The hydraulic fluid thereby separates.One part flows via the orifice(7) through the path(18) and the other portion flows into the parallelpath(6), the path(19) and the port Ab1. The flow from the path(18) through the orifice(7) decreasesslightly and the pressure Fr in the path(10) thereby also slightly decreases. As the pressure Frbecomes lower, the discharge of the pump P2(27) increases. With the pilot control lever shiftedeven more the path(18) is shut off by the shifting of the spool(303) and then the flow through thebypass becomes zero. The pressure in the path(10) becomes zero and the discharge of the pumpP2(27) becomes maximum.(Qmax)Because the discharge of the pump is adjusted by operating the pilot control lever slightly, theprecise moving of the actuator is realized.For the pump P1(28) the same negative control principle of operation occurs utilizing the orifice(9).29072MC32 [...]... port R2 through path(13) 2-3 3 ② Arm roll in operation ・During light load only 306 370 379 LCa2 XBa2 XAa2 A2 (a) (c) A1 XBa1 XAa1 Aa1R Ba1R 13 Aa1 22 302 LCa1 HV Ba1 511 516 370 379 25072MC07 2-3 4 ・ The pressure in the arm cylinder head side increases 306 370 379 LCa2 XBa2 XAa2 A2 (d) A1 (e) (a) (f) (b) XBa1 XAa1 Aa1r Ba1R 13 Aa1 22 302 LCa1 HV Ba1 511 516 370 379 25072MC08 2-3 5 During the arm roll in... spool(303) through the port Ab1 Thereafter it is directed to the return port R2 through path(4) Additionally, the return flow is restricted in path(45), which lowers the boom cylinder at a suitable speed 2-3 2 (2) Arm control ① Arm roll out operation 306 370 379 LCa2 XBa2 XAa2 A2 A1 XAa1 XBa1 Aa1R Ba1R 13 Aa1 22 302 LCa1 HV Ba1 511 516 370 379 25072MC06 During the arm roll out operation, the pilot pressure... the head side of the boom cylinder The flow from the rod side of the boom cylinder returns to the boom1 spool(303) through the port Bb1 Thereafter it is directed to the return port R2 through path(13) 2-3 1 ② Boom down operation Bb1 LCb1 370 379 45 516 511 303 Ab1 Ab1R Bb1R XBb1 XAb1 6 B1 13 SP (PSP) B2 4 XAb2 SP CCb CSP 376 370 370 379 511 511 307 25072MC05 During the boom down operation, the pilot pressure... path(22) Then it enters into the head side of the arm cylinder through the check valve of boom priority valve(104) and port Aa1 The return flow from the rod side of the arm cylinder is pressurized by self-weight of arms and so on, and returns to port Ba1 The pressurized oil returning to port Ba1 enters into the arm1 spool through the outside of the arm1 spool During a light load only, it pushes open the... enters flow port Ba1 through the periphery hole(a) of the arm1 spool into the spool, flows out through the periphery hole(b) of the spool, and returns through the tank port R2 to the hydraulic oil tank 2-3 6 (3) Bucket control ① Bucket roll in operation 379 370 511 LCk Ak1 Bk1 BkR AkR XAk XBk BK 13 304 6 4 29072MC38 During the bucket roll in operation, the pilot pressure from the pilot control valve is... of the bucket cylinder The retutn flow from the rod side of the bucket cylinder returns to the bucket spool(304) through the port Ak1 Thereafter it is directed to the return port R2 through path(13) 2-3 7 ② Bucket confluence operation BC XBp1 XBp2 NR1 NR2 Fl Dr2 Fr 392 329 328 Ck1 Ck2 25072MC09 During the bucket roll in operation, the pilot pressure from the pilot control valve is supplied to port XBp1... But bypass path is shut off by the bypass cut spool Therefore the hydraulic fluid is directed to port Ck2 after passing through the check valve Ck1 Then the fluid is directed to the bucket spool(304) 2-3 8 ③ Bucket out operation 379 370 511 LCk Ak1 Bk1 BkR AkR XBk XAk BK 13 304 6 4 29072MC39 During the bucket roll out operation, the pilot pressure from the pilot control valve is supplied to port XAk... of the bucket cylinder The return flow from the head side of the bucket cylinder returns to the bucket spool(304) through the port Bk1 Thereafter it is directed to the return port R2 through path(4) 2-3 9 (4) Swing control S XAs XBs 22 13 4 Bs 305 As 251 254 370 379 Pns 29072MC41 During the swing right or left operation, only the hydraulic fluid of the pump P1 is supplied to the swing motor The pilot... flow from the swing motor enters port Bs The flow from the motor returns to the tank port R2 through the swing spool(305) and path(13) In the case of the opposite operation, the operation is similar 2-4 0 (5) Travel control 328 329 301 Btr Atr XBtr XAtr TR TL XBtl XAtl Btl Atl 310 328 329 29072MC42 During the travel operation, the hydraulic fluid of the pump P1 is supplied to the travel motor and the... the travel motors enter port Btl and port Btr The flow from the motors returns to the tank port R2 through the travel spools(310 and 301) In the case of the opposite operation, the operation is similar 2-4 1 4) CIRCUIT PRESSURE PROTENCTION The control valve has two kinds of relief valve to limit the pressure in a circuit (1) Main relief valve Limits the pressure of the main hydraulic system Pz CMR1 CMR2 . A1XAa1Aa1R2013363 323 353793703 322 6116555156130616 520 3333331337 329 328 33 126 23 925 5156161116555561155116 920 226 420 4XBa2XBp1Dr2NR2FRFLCk1XAa2A2 BCXBp2NR1561LCa 226 420 4 424 425 438401PP551 561 521 511551 561 521 511K1C1CP2P2L1155167P2CP2551561 521 511P2L1AtlBtlSECTION. 2R2P2XBk102K11864SECTION A-ASECTION B-B25072MC1 029 072MC26 2- 2 6A2XAa2(XBp2)611611BCDr2LCa2NR2NR1(XBp1)(Ck1)XBa2FLFR413134ABJAP1TLTRSOPB2B1A1BKBCA2PZMRTSDr2NR2R2 (P2) R1Dr3PaLPbLDr4Dr6PnsPxPGJFCGEDFGCDEHBHSECTION