Toro Pro Force 44554 - Kohler Gasoline Engine

KohlerGasolineEngine
g278566
Figure7
1.Pulsestylefuelpump4.Fuelshut-offsolenoid
2.Governorcontrolunit(GCU)5.Oilpressureswitch
3.Voltageregulator/rectier6.Digitallinearactuator(DLA)
Theengineincludesanelectronicspeedcontrolsystem.Inadditiontothe
necessarylinkages,thespeedcontrolsystemincludesaGovernorControlUnit
(GCU)andaDigitalLinearActuator(DLA).Electricalpowermustbeavailable
totheGCUfortheenginetostartandrun.Enginespeedisadjustedbyusing
eitherthewirelessortetheredremote.RefertotheKOHLERCommandPro
CH740ServiceManualforadditionalinformation.
Theengineincludesanoilpressureswitch.Whenoilpressureisbeinggenerated
(engineisrunning)theswitchisclosed.Ontetheredremotemachines,the
closedswitchprovidesapathtogroundforthehourmetercircuit.Onwireless
remotemachines,theclosedswitchprovidesapathtogroundforthehourmeter
circuitandisaninputfortheT oroElectronicController(TEC).TheTECbegins
tomonitortheconditionoftheoilpressureswitch3minutesaftertheengineis
started.Whentheoilpressuredropstoolow(switchcircuitopens),theengineis
allowedtorunforapproximately10secondsandisthenshutdown.
Theengineincludesapulsestylefuelpumpandafuelshut-offsolenoid.
Oscillatingcrankcasepressurecausesadiaphragminsidethepulsestylefuel
pumptopullfuelinonthepistondown-strokeandtopushitintocarburetor
onthepistonup-stroke.Twocheckvalvespreventfuelfromgoingbackward
throughpump.Thefuelshut-offsolenoidhasaspringloadedpinthatretracts
when12voltsisapplied,allowingfuelowtothecarburetormainjet.When
currentisremoved,thepinextendsblockingthefuelow.
ProForce®DebrisBlower
Page4–3
Engine:GeneralInformation
18237SLRevA