handleshutdown重启

JohnDeereEngineSafetyShutdownwith"BlackBox"(priortoTierIIECUengines)TroubleshootingIfthehydraulicoilorwaterlevelislow,butnotlowenoughtocausetheShutDowntokilltheengine,the"Slosh"onthesensorscancausetheenginetoactlikethekeyisbeingturnedoffandon.
VerifyWaterTemperatureGaugeswitchset:Max220degrees.
VerifyHydraulicOilFull.
VerifyEngineOilLevel.
VerifyWaterinradiatorandoverflowbottleboltedintheenginecompartment,oppositethedriver'sside.
Waterlevelisverysensitive.
Aprobetesterwithalightinthehandleisagoodtool,andacontinuitymeter.
RemoveFuelInjectionPumpwiretopreventaccidentalstarting.
GeneralOperationWhenkeyisturnedON,theMurphyRelay760-A-F30secondtimerstarts.
Thisistoallowtimeforoilpressuretobuild.
Ifenginefailstostartin30seconds,theLowOilPressuresafetywillnotletitstartatall.
Thekeymustbeturnedoff,andbackontostartthe30secondtimeragain.
MurphyRelay760-A-F(TuckerPart#80575-17)B+12vfromkeyswitch(battery)SSensorswitches.
WhenSisgrounded,theswitchoperatestoshutofftheengineNCprovides+12vtoAlternatorandFuelInjectorPumpwhenkeyisturnedonNO0vduringnormaloperationWhentheMurphyRelayoperates(groundfromanysensortotheSterminal)NC0v.
PowerisshutofftoAlternatorandFuelInjectorPumpNO+12vtoAmperiteRelaytoturnWaterSensorOff(keyOff/OnresetsAmperitealso)AmperiteRelay120SPDT30SC(TuckerPart#80575-171)+ToNOonMurphyRelay-TogroundC+12vfromkeyswitch(battery)NC+12vtoWaterLevelSensorWhentheMurphyRelayoperates(hasasignaltoS),theAmperiteRelay:+Receives+12vfromMurphyRelayandstartsa30secondtimerintheAmperite.
After30seconds,theNCcontactsintheAmperitecomeopen,shuttingthe+12vofftotheWaterLevelsensorsoitwon'tburnup.
Ittakesakeyswitchcycle(powerOff/On)toresettheAmperitetonormaloperation.
MurphyDiode65-01-0094(TuckerPart#80575-71)Thisisa"CheckValve"toallowcurrenttopasstotheAlternator,butnotbackfromtheAlternator.
IftheDiodefailsandallowscurrenttobackflow,theshutdownsystemwouldnotbeabletoshutpowerofftotheFuelInjectorPump.
Sotheenginemightstayrunningevenifoneofthesensorswastryingtoshutitdown.
Withtheengineoff,testtheDiodewithacontinuitymeter.
Thereshouldbecontinuityonewayandnottheother.
TestingTest#1(Enginenotrunning)Bereadywithvoltmetertocheckfor+12vonTerminals8and4.
4shouldturnoff30secondsafterkeyisturnedon.
IfNoVoltageon8,checkKeySwitchandWiring.
Ifnovoltagewason4,checkMurphyRelay.
Remember4turnsoff30secondsafterkeyisturnedon.
Test#2(Enginenotrunning)Removeandtapewireonoilpressureswitch.
TurnonKeySwitch,checkfor+12vonterminal4,4shouldnotturnoffin30seconds.
TurnoffKeySwitch.
Iftest#1andTest#2weregood,thesystemshouldbenormalIftest#2fails,removeandtapewirefromMurphySwitch(S).
TestTerminal2forGround.
Itmustnottestgrounded.
Ifgrounded,separatewiresandtestWaterTemperature,OilLevel,andHydraulicLevel.
ReplaceanygroundedLevelSwitchorLeadWire.
ForWaterLevelSwitchOnly:IftheLevelSwitchwillnotshutdownonlowwaterTurnonKeySwitch.
Checkfor+12vonterminalblockposition(1).
Thevoltagewillturnoffinapproximately60seconds.
TurnKeySwitchoff.
Ifnovoltage,suspectAmperiteRelayIfvoltagegood,suspectLevelSwitchorWiringAfterrepairsandtesting,replaceFuelWire.