Toro 74990 - Cooling System Maintenance; Cleaning the Engine Screen and Engine-Oil Cooler; Cleaning the Engine Cooling Fins and Shrouds

•Ifthegapislessthan0.010inch,
thenreinstalltheshimandreference
Troubleshooting(page71).
•Ifthegapissufcient,proceedtothe
safetycheckinstepF.
F.Performthefollowingsafetycheck:
i.Sitontheseatandstarttheengine.
ii.Makesurethatthebladesdonot
engagewiththePTOswitchedoff
andtheclutchdisengaged.
Iftheclutchdoesnotdisengage,
installtheshimandreference
Troubleshooting(page71).
iii.EngageanddisengagethePTO
switch10consecutivetimesto
ensurethattheclutchisfunctioning
properly.Iftheclutchdoes
notengageproperly,reference
Troubleshooting(page71).
CoolingSystem
Maintenance
CleaningtheEngineScreen
andEngine-OilCooler
ServiceInterval:Beforeeachuseordaily
Removeanybuildupofgrass,dirt,orotherdebris
fromtheoilcooler(Figure74).
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g009191
Figure74
Beforeeachuseremoveanybuildupofgrass,dirt,or
otherdebrisfromtheenginescreen.Thiswillhelp
ensureadequatecoolingandcorrectenginespeed
andwillreducethepossibilityofoverheatingand
mechanicaldamagetotheengine(Figure75).
CleaningtheEngine
CoolingFinsandShrouds
ServiceInterval:Every100hours/Yearly(whichever
comesrst)
1.DisengagethePTOandsettheparkingbrake.
2.Stoptheengine,removethekey,andwait
forallmovingpartstostopbeforeleavingthe
operatingposition.
3.Removetheairintakescreen,recoilstarterand
fanhousing(Figure75).
4.Cleanthedebrisandgrassfromtheengine
parts.
5.Installairintakescreen,recoilstarterandfan
housing(Figure75).
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