Toro 74449 - Fuel System Maintenance

CheckingtheSparkPlugs
ServiceInterval:Every100hours
1.Lookatthecenterofthesparkplugs(Figure33).
Ifyouseelightbrownorgrayontheinsulator,the
engineisoperatingproperly.Ablackcoatingonthe
insulatorusuallymeansthattheaircleanerisdirty.
2.Ifneeded,cleanthesparkplugwithawirebrushto
removecarbondeposits.
Figure33
1.Centerelectrodeinsulator3.Airgap(nottoscale)
2.Sideelectrode
Important:Alwaysreplacethesparkplugs
whenithasablackcoating,wornelectrodes,
anoilylm,orcracks.
3.Checkthegapbetweenthecenterandsideelectrodes
(Figure33).Bendthesideelectrode(Figure33)if
thegapisnotcorrect.
InstallingtheSparkPlugs
1.Installthesparkplugsandthemetalwasher.Ensure
thattheairgapissetcorrectly.
2.Tightenthesparkplugsto16ft-lb(22N⋅m).
3.Connectthewirestothesparkplugs(Figure33).
FuelSystem
Maintenance
ReplacingtheFuelFilter
ServiceInterval:Every200hours—Replacethefuel
lter
Neverinstalladirtylterifitisremovedfromthefuel
line.
1.DisengagethePTO,movethemotioncontrollevers
totheneutrallockedposition,andsettheparking
brake.
2.Stoptheengine,removethekey,andwaitforall
movingpartstostopbeforeleavingtheoperating
position.
3.Allowthemachinetocooldown.
4.Stoptheengine,removethekey,andwaitforall
movingpartstostopbeforeleavingtheoperating
position.
5.Closethefuelshutoffvalve(Figure34).
Figure34
1.Hoseclamp3.Filter
2.Fuelline
6.Squeezetheendsofthehoseclampstogetherand
slidethemawayfromthelter(Figure34).
7.Removethelterfromthefuellines.
8.Installanewlterandmovethehoseclampsclose
tothelter(Figure34).
9.Openthefuelshutoffvalve.
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