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HexTechnicianSkillChallengeSelf-StudyHighlights300CHEXMachineHydraulicSystemEmphasisshouldbeplacedonHydraulicsystemoperation,testingandadjusting.Mustunderstandtheoperationofeachfollowinghydraulicsubsystems:1>PilotSystem1.Locateandidentifythemajorcomponentsofthepilotsystem.2.Functiondescription2>Pumpanditscontrol1.Locateandidentifythemajorcomponentsofthehydraulicpump.2.Tracetheflowofoilthroughthepumpandpumpcontrols.3.Explainhowchangesinthethree-signalpressureschangepumpflow.3>HydraulicControlValve1.Locateandidentifythemajorcomponentsofthemaincontrolvalvegroup.2.Checkhydraulicsystempressuresusingthemonitorpanel.3.DescribeAnti-driftfunction4.Describere-generationcircuitofbothBoomandStickcontrol.4>SwingControlSystem1.Locateandidentifythemajorcomponentsoftheswingsystem.2.Tracetheflowofoilthroughtheswingcircuit.3.Explaintheoperationoftheswingparkingbrake.5>TravelControlSystem1.Locateandidentifythemajorcomponentsofthetravelsystem.2.Tracetheflowofoilthroughthetravelcircuits.3.Explaintheoperationofthetravelparkingbrake.4.Explaintheoperationofthecounterbalancevalve5.Knowhowthetravelspeedischanged6>FanHydraulicSystem1.Explainandtracetheflowofoilthroughthefanhydraulicsystem.(Onlyfor325C-330CHEX)Self-studyincludescandidates’readingandreviewingthekeypointshighlightedaboveinthedistributedServiceManualinChinese-RCNR3816for320C,RCNR5364for325CandRCNR5435for330CseminardiscussionorganizedbyDealerInstructors,andpracticaltestinghands-onthemachinesassistedbyDealerInstructorifrequired.FrequentlyAskedQuestionsfocusonmachinehydraulicsystemoperationandT&Asection,Takesomeexamplesasfollows:1>ComponentsWhatarethemaincomponentsconsistedofpilotsystem?2>FunctionandoperationWhatarethefunctionsofthepilotsystemin300CHEX?3>LocationWherearetheirlocationsonthemachine?4>TestingandAdjustingHowdoyoumakeanadjustmentonpilotreliefvalve?Practice:Beabletopractiseoneachfollowinghydraulicsubsystems:1>PilotSystem1.PilotPressureTestandAdjust2.Testtheoperationo
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