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Shop manual máy đào HuynDai R250: An toan, cấu trúc, sơ đồ điện, thủy lực,
SECTION 2 STRUCTURE AND FUNCTIONGroup 1 Pump Device 2-1Group 2 Main Control Valve 2-21Group 3 Swing Device 2-47Group 4 Travel Device 2-58Group 5 RCV Lever 2-69Group 6 RCV Pedal 2-76 2-11. STRUCTUREThe pump device consists of main pump, regulator and gear pump.SECTION 2 STRUCTURE AND FUNCTIONGROUP 1 PUMP DEVICEPm2a4a2Pi1A3B3Pi2Psva4DrQmin adjusting screwQmax adjusting screwQmin adjusting screwRegulatorRegulatorPi2Pi1a4PsvB1DrPort blockRear pumpGear pumpa3B3a1a1A1PsvPm2a3A3B3B1DrMFr(Pi2)Pm1Fl(Pi1)a2A2Front pumpPm1Pm2Pm1PortA1,2B1DrPi1,i2Pm1,m2Psva1,2,4a3A3B3Port nameDelivery portSuction portDrain portPilot portQmax cut portServo assist portGauge portGauge portGear pump delivery portGear pump suction portPort sizeSAE6000psi 3/4"SAE2500psi 2 1/2"PF 3/4 - 20PF 1/4 - 15PF 1/4 - 15PF 1/4 - 15PF 1/4 - 15PF 1/4 - 14PF 1/2 - 19PF 3/4 - 20.521072MP01 2-2MAIN PUMP(1/2)The main pump consists of two piston pumps(front & rear) and valve block.1)04 Gear pump111 Drive shaft(F)113 Drive shaft(R)114 Spline coupling123 Roller bearing124 Needle bearing127 Bearing spacer141 Cylinder block151 Piston152 Shoe153 Push plate156 Bushing157 Cylinder spring158 Spacer211 Shoe plate212 Swash plate214 Bushing251 Swash plate support261 Seal cover(F)271 Pump casing312 Valve block313 Valve plate(R)314 Valve plate(L)401 Hexagon socket bolt406 Hexagon socket bolt435 Flange socket bolt466 VP plug468 VP plug490 VP plug531 Tilting pin532 Servo piston534 Stopper(L)535 Stopper(S)548 Pin702 O-ring710 O-ring717 O-ring719 O-ring724 O-ring725 O-ring728 O-ring732 O-ring774 Oil seal789 Back up ring792 Back up ring808 Hexagon head nut824 Snap ring885 Pin886 Spring pin901 Eye bolt953 Set screw954 Set screw123789532548724 792535808953886717406261824111774127710251490401212211153156158157313114124312725466885314728468012151152271732214531702 534 90180871904211 113211435401954A21072MP02 2-3MAIN PUMP(2/2)079 Proportional reducing valve325 Casing assy407 Hexagon screw466 Plug490 Plug541 Seat543 Stopper 1544 Stopper 2545 Steel ball725 O-ring732 O-ring544543545541466725490407VIEW AB725732VIEW B72507932521072MP03 2-4REGULATOR(1/2)2)647412875874AB755858614615613611BA897612730643708644645646728924801438SECTION B-BBAKR3G-9C32P2PfPm413438Pi436725724496735656438722VIEW C648723642801724641PiPortABPiPmPort nameDelivery portSuction portPilot portQmax cut portport size3/4"2 1/2"PF 1/4-15PF 1/4-1525072RE01 2-5REGULATOR(2/2)412 Hexagon socket screw413 Hexagon socket screw436 Hexagon socket screw438 Hexagon socket screw496 Plug601 Casing611 Feed back lever612 Lever(1)613 Lever(2)614 Fulcrum plug615 Adjust plug621 Compensator piston622 Piston case623 Compensator rod624 Spring seat(C)625 Outer spring626 Inner spring627 Adjust stem(C)628 Adjust screw(C)629 Cover(C)630 Lock nut631 Sleeve, pf641 Pilot cover642 Adjust screw(QMC)643 Pilot piston644 Spring seat(Q)645 Adjust stem(Q)646 Pilot spring647 Stopper648 Piston(QMC)651 Sleeve652 Spool653 Spring seat654 Return spring655 Set spring656 Block cover708 O-ring722 O-ring723 O-ring724 O-ring725 O-ring728 O-ring730 O-ring732 O-ring733 O-ring734 O-ring735 O-ring755 O-ring756 O-ring763 O-ring801 Nut814 Snap ring836 Snap ring858 Snap ring874 Spring pin875 Pin887 Pin897 Pin898 Pin924 Set screw925 Adjust screw(QI)734 653654 836 651652601624629 630 628801925627732756763887626625623621622733732631898814641655SECTION A-AC29072RE02 2-6GEAR PUMP3)307 Poppet308 Seat309 Spring seat310 Spring311 Screw312 Nut351 Gear case353 Drive gear354 Driven gear355 Filter361 Front case433 Flange socket434 Flange socket435 Flange socket466 Plug700 Ring710 O-ring725 O-ring732 O-ring850 Snap ring700 354 351 433434311312850355a3A3B3710 435 361 353 732 309 307 310 308 434 466, 725(290LC-7) 2-6 2-7Rotary groupThe rotary group consists of drive shaft(F)(111), cylinder block(141), pistonshoes(151,152), set plate(153), sphericalbush(156), spacer(158) and cylinderspring(157). The drive shaft is supportedby bearing(123,124) at its both ends.The shoe is caulked to the piston to froma spherical coupling. It has a pocket torelieve thrust force generated by loadingpressure and the take hydraulic balanceso that it slides lightly over the shoeplate(211). The sub group composed bya piston and a shoe is pressed againstthe shoe plate by the action of thecylinder spring via a retainer and aspherical bush.Similarly, the cylinder block is pressedagainst valve plate(313) by the action ofthe cylinder spring.Swash plate groupThe swash plate group consists of swashplate(212), shoe plate(211), swash platesupport(251), tilting bush(214), tiltingpin(531) and servo piston(532).The swash plate is a cylindrical partformed on the opposite side of the slidingsurface of the shoe and is supported bythe swash support.If the servo piston moves to the right andleft as hydraulic force controlled by theregulator is admitted to hydraulicchamber located on both sides of theservo piston, the swash plate slides overthe swash plate support via the sphericalpart of the tilting pin to change the tiltingangle(α)2. FUNCTIONMAIN PUMPThe pumps may classified roughly into the rotary group performing a rotary motion and working asthe major part of the whole pump function: the swash plate group that varies the delivery rates: andthe valve cover group that changes over oil suction and discharge.1)(1) (2)157211211123111212251532αα151152531548214124313141158156153290LC-7(2-6(1))290LC-7(2-7) 2-8Valve block groupThe valve block group consists of valveblock(312), valve plate(313) and valveplate pin(885).The valve plate having two melon-shaped ports is fixed to the valve blockand feeds and collects oil to and from thecylinder block.The oil changed over by the valve plate isconnected to an external pipeline by wayof the valve block.Now, if the drive shaft is driven by a primemover(electric motor, engine, etc), itrotates the cylinder block via a splinelinkage at the same time. If the swashplate is tilted as in Fig(previous page) thepistons arranged in the cylinder blockmake a reciprocating motion with respectto the cylinder block, while they revolvewith the cylinder block.If you pay attention to a single piston, itperforms a motion away from the valveplate(oil sucking process) within 180degrees, and makes a motion towardsthe valve plate(or oil discharging process)in the rest of 180 degrees. When theswash plate has a tilting angle of zero,the piston makes no stroke anddischarges no oil.(3)313885312290LC-7(2-8) 2-9Negative flow controlBy changing the pilot pressure Pi, thepump tilting angle(delivery flow) isregulated arbitrarily, as shown in thefigure.This regulator is of the negative flowcontrol in which the delivery flow Qdecreases as the pilot pressure Pi rises.With this mechanism, when the pilotpressure corresponding to the flowrequired for the work is commanded, thepump discharges the required flow only,and so it does not consume the poweruselessly.REGULATORRegulator consists of the negative flow control, total horse power control and power shift controlfunction.2)(1) Pilot pressure, PiDelivery flow, Q [...]... change Input torque amount change amount (min -1 ) (Turn) (ℓ/min) (kgf・m) 2000 +1/4 +9.9 290LC-7( 2-1 7) Delivery flow, Q Tightening amount of adjusting screw(QI) (925) +4.6 Delivery pressure, (P1+P2) 2-1 7 (3) Power shift control 621 651 652 623 P1 898 612 625 626 CL B(E) 897 F Pf P2 P1 875 611 Large diameter chamber Servo piston Small diameter chamber D 290LC-7( 2-1 8) Delivery flow, Q The set horsepower valve... turns at first.(A=1.78) 625 626 925 290LC-7( 2-1 6) Adjustment of outer spring Speed (Turn) (kgf/cm2) (kgf・m) 2000 +1/4 +15.9 Delivery flow, Q Compens- Input torque ating control change starting amount pressure change amount (min -1 ) 628 801 ※ Adjusting values are shown in table Tightening amount of adjusting screw(C) (925) 630 +4.8 Delivery pressure, (P1+P2) 2-1 6 b Adjustment of inner spring Adjust it... pressure(or during relieving) may increase 808 953 290LC-7( 2-1 9(2)) Delivery flow, Q Adjustment of min flow Speed Tightening amount of adjusting screw (953) Flow change amount (min -1 ) (Turn) ( /min) 2000 +1/4 +4.6 Delivery pressure, Pi 2-1 9 (5) Qmax cut control The regulator regulates the maximum delivery flow by inputting the pilot pressure Pm Since this is a 2-position control method, the maximum delivery... pressure Pf falls 2-1 8 (4) Adjustment of maximum and minimum flows 808 Adjustment of maximum flow Adjust it by loosening the hexagon nut(808) and by tightening(or loosening) the set screw(954) The maximum flow only is adjusted without changing other control characteristics 954 290LC-7( 2-1 9(1)) Adjustment of max flow Tightening amount of adjusting screw (954) Flow change amount (min -1 ) (Turn) ( /min)... values are shown in table Tightening Flow control amount of starting adjusting pressure screw(924) change amount 290LC-7( 2-1 2) Flow change amount (min -1 ) (Turn) (kgf/cm2) (ℓ/min) 2000 +1/4 +1.5 Delivery flow, Q Speed Adjustment of flow control characteristic +13 Pilot pressure, Pi 2-1 2 (2) Total horsepower control Delivery flow, Q The regulator decreases the pump tilting angle(delivery flow) automatically... following.(For detailed behaviors of respective parts, refer to the section of flow control) Delivery pressure, (P1+P2) 2-1 3 ① Overload preventive function 621 651 652 623 P1 612 601 625 626 CL B(E) 897 F P2 P1 875 611 Large diameter chamber Servo piston D Small diameter chamber 290LC-7( 2-1 4) When the self pump delivery pressure P1 or the companion pump delivery pressure P2 rises, it acts on the stepped... point F and the spool is shifted to the left The spool moves till the opening between the spool(652) and sleeve(651) is closed 2-1 4 ② Flow reset function 621 651 623 652 P1 612 601 625 626 CL B(E) 897 F P2 P1 875 Large diameter chamber Servo piston D Small diameter chamber 290LC-7( 2-1 5) As the self pump delivery pressure P1 or the companion pump delivery pressure P2 decreases, the compensating rod(623)... the sleeve(651) and spool(652) to close slowly, and the servo piston comes to a complete stop when it closes completely 2-1 0 ② Flow increasing function 643 654 651 P1 652 613 CL 646 B(E) 874 897 C 875 611 Large diameter chamber Servo piston D 548 Small diameter chamber 531 290LC-7( 2-1 1) As the pilot pressure Pi decreases, the pilot piston(643) moves to the left by the action of the pilot spring(646)...① Flow reducing function 643 654 651 P1 652 613 CL 646 B(E) 874 897 C A 875 611 Large diameter chamber Servo piston D 548 Small diameter chamber 531 290LC-7( 2-1 0) As the pilot pressure Pi rises, the pilot piston(643) moves to the right to a position where the force of the pilot spring(646) balances with the hydraulic force The groove(A) in the pilot piston... action of the feedback mechanism to move it till the opening between the spool and sleeve is closed 2-1 5 ③ Low tilting angle(low flow) command preferential function As mentioned above, flow control and horsepower control tilting angle commands are transmitted to the feedback lever and spool via the large-hole sections(C & F) of levers 1 and 2 However, since sections C and F have the pins(Ø4) protruding . over oil suction and discharge .1) (1) (2 )15 7 211 211 12 311 1 212 2 515 32α 15 115 25 315 48 214 124 313 1 411 5 815 615 3290LC-7( 2-6 (1) )290LC-7( 2-7 ) 2-8 Valve block groupThe valve. pin9 01 Eye bolt953 Set screw954 Set screw123789532548724 792535808953886 717 4062 618 2 411 177 412 7 710 2 514 904 012 12 211 15 315 615 815 7 313 114 124 312 725466885 314 728468 012 1 511 522 717 32 214 5 317 02