Máy đào HuynDai R250 - P5.11

Shop manual máy đào HuynDai R250: An toan, cấu trúc, sơ đồ điện, thủy lực,

5-22GROUP 11 EPPR VALVE1. COMPOSITION OF EPPR VALVEEPPR(Electro Proportional Pressure Reducing) valve consists of electro magnet and spool valveinstalled at main hydraulic pump. ELECTRO MAGNET VALVEReceive electric current from CPU controller and move the spool proportionally according to thespecific amount of electric current value.SPOOL VALVEIs the two way direction control valve for pilot pressure to reduce hydraulic pump flow.When the electro magnet valve is activated, pilot pressure enters into flow regulator of hydraulic pump.So, pump flow decreases to prevent engine stall.PRESSURE AND ELECTRIC CURRENT VALUE FOR EACH MODE2. HOW TO SWITCH THE VERSION(1.x Ĉ 2.x)OON THE CLUSTERYou can switch the EPPR valve pressure set by selecting the version(1.x Ĉ 2.x).Step 1. Turn the key switch ON.Step 2. Press the SELECTswitch 3 times.Step 3. While 7 segment on the cluster shows the version of the CPU controller program, for example25C1.1press the buzzer stop switch( ) + travel speed control switch( ) at the sametime for 2 seconds.The display changes to 25C2.1, and it indicates that version 2.2(Option) is selected.öIf you want to get back to ver:1.x, go to step 1~3.11)2)3)øManually operated condition when prolix switch is selected emergency position.ModePressurekgf/cm2psiElectric current(mA)Engine rpm(At accel dial 10)Standard(Ver : 1.x)Option(Ver : 2.x)7 Ü310 Ü310 Ü304 Ü37 Ü319 Ü3100 Ü40 142 Ü40142 Ü400 Ü4058 Ü40100 Ü40275 Ü40280 Ü30320 Ü30320 Ü30160 Ü30230 Ü30280 Ü30440 Ü302250 Ü502150 Ü502050 Ü502000 Ü502000 Ü501900 Ü50-MHSMHSø 5-232. OPERATING PRINCIPLESTRUCTURE1)P Pilot oil supply line(Pilot pressure)T Return to tankA Secondary pressure to flow regulator at hydraulic pumpAT H MODEPressure line is blocked and A oil returns to tank.AT S MODESecondary pressure enters into A.PTAPTAPTA234 56711 Sleeve2 Spring3 Spool4 O-ring5 O-ring6 Solenoid valve7 ConnectorPTAPTA2)3)(290-7TIER) 5-22(1)(290-7TIER) 5-22A(290-7TIER) 5-22(2)(290-7TIER) 5-22B(290-7TIER) 5-22C 5-243. EPPR VALVE CHECK PROCEDURECHECK ELECTRIC VALUE AT EPPR VALVEStart engine.Set S-mode and cancel auto decel mode.Position the accel dial at 10.If tachometer show approx 2150±50rpm,disconnect one wire harness from EPPRvalve.Install multimeter as figure.Check electric current at bucket circuitrelief position.CHECK PRESSURE AT EPPR VALVERemove plug and connect pressuregauge as figure.・Gauge capacity : 0 to 40-50kgf/cm2(0 to 580-725psi)Start engine.Set S-mode and cancel auto decel mode.Position the accel dial at 10.If tachometer show approx 2150±50rpm,check pressure at relief position of bucketcircuit by operating bucket control lever.If pressure is not correct, adjust it.After adjust, test the machine.CN-75MultimeterEPPR VALVECN-75Supply line, pilot pressPressure adjustingscrewlocknut(1)(2)(3)(4)(5)(6)(1)(2)(3)(4)(5)(6)(7)1)2)Spec : 200~450mASpec : 2~25kgf/cm2(30~350psi)(290-7TIER) 5-23(1)(290-7TIER) 5-23(2) . 56 711 Sleeve2 Spring3 Spool4 O-ring5 O-ring6 Solenoid valve7 ConnectorPTAPTA2)3)(29 0-7 TIER) 5-2 2(1)(29 0-7 TIER) 5-2 2A(29 0-7 TIER) 5-2 2(2)(29 0-7 TIER) 5-2 2B(29 0-7 TIER). 5-2 2(2)(29 0-7 TIER) 5-2 2B(29 0-7 TIER) 5-2 2C 5-2 43. EPPR VALVE CHECK PROCEDURECHECK ELECTRIC VALUE AT EPPR VALVEStart engine.Set S-mode and cancel auto decel