Toro 74490 Service Manual

GeneralTroubleshooting
Problem
PossibleCauseCorrectiveAction
Thebladecontrolswitch(PTO)is
engaged.
Movetheblade-controlswitch(PTO)to
thedisengagedposition.
Theparkingbrakeisnotengaged.
Settheparkingbrake.
Themotion-controlleversarenotinthe
Neutral-Lockposition.
Ensurethatthemotion-controllevers
areintheNeutral-Lockposition.
Theoperatorisnotseated.
Sitontheseat.
Thebatteryisdead.
Chargethebattery.
Theelectricalconnectionsarecorroded
orloose.
Checktheelectricalconnectsforgood
contact.
Thefuseisblown.Replacethefuse.
Thestarterdoesnotcrank
Therelayorswitchiswornordamaged.
Testandreplacefaultyrelayorswitch.
Thefueltankisempty.Fillthefueltank.
Thefuelshut-offvalveisclosed.Openthefuelshut-offvalve.
Theoillevelinthecrankcaseislow.Addoiltothecrankcase.
Thethrottleisnotinthecorrectposition.Besurethatthethrottlecontrolis
midwaybetweentheslowandfast
positions.
Thereisdirtinthefuellter.Replacethefuellter.
Thereisdirt,water,orstalefuelinthe
fuelsystem.
Cleanandushthefuelsystem.
Theaircleanerisdirty.
Cleanorreplacetheaircleaner
element.
Theseatswitchisnotfunctioning
properly.
Checktheseat-switchindicator.
Replacetheseatifnecessary.
Theelectricalconnectionsare
corroded,loose,ordamaged.
Checktheelectricalconnectionsfor
goodcontact.Cleantheconnector
terminalsthoroughlywithelectrical-
contactcleaner,applydielectricgrease,
andmaketheappropriateconnections.
Therelayorswitchiswornordamaged.
Testandreplacefaultyrelayorswitch.
Thesparkplugisfouledorimproperly
gapped.
Adjustorreplacethesparkplug.
Theenginedoesnotstart,starts
hard,orfailstokeeprunning
Thesparkplugwireisnotconnected.
Checkthesparkplugwireconnection.
Theengineloadisexcessive.Reducethegroundspeed.
Theaircleanerisdirty.
Cleantheaircleanerelement.
Theoillevelinthecrankcaseislow.Addoiltothecrankcase.
Thecoolingnsandairpassages
abovetheengineareplugged.
Removetheobstructionandthoroughly
cleancoolingnsandtheairpassages.
Theventholeinthefuelcapisplugged.Cleanorreplacethefuelcap.
Thereisdirtinthefuellter.Replacethefuellter.
Enginelosespower
Thereisdirt,water,orstalefuelinthe
fuelsystem.
Cleanandushthefuelsystem.
2000SeriesZMASTER®ServiceManual
Page3–3
Troubleshooting:GeneralTroubleshooting
3438-778RevA

Toro 74490 Specifications

General

Brand	Toro
Model	74490
Category	Lawn Mower
Language	English