Exmark COMMERCIAL 21 - Engine will not start, starts hard, or fails to keep running.; Engine loses power.; Uneven cutting pattern.

Troubleshooting
Troubleshooting
Important:Itisessentialthatalloperatorsafetymechanismsbeconnectedandinproperoperating
conditionpriortomoweruse.
Whenaproblemoccurs,DoNotoverlookthesimplecauses.Forexample:startingproblemscouldbe
causedbyanemptyfueltank.
Thefollowingtablelistssomeofthecommoncausesoftrouble.Ifaproblemcontinues,contactanAuthorized
ServiceDealer.
ProblemPossibleCauseCorrectiveAction
1.Fueltankisempty.1.Fillthefueltank.
2.Fuelshutoffvalveisclosed.
2.Openthefuelshutoffvalve.
3.Thethrottleleverisnotinthecorrect
position.
3.MovethethrottlelevertotheChoke
position.
4.Dirt,water,orstalefuelisinthefuel
system.
4.ContactanAuthorizedServiceDealer.
5.Faultysparkplug.
5.Clean,adjustorreplacesparkplug.
Enginewillnotstart,startshard,orfailsto
keeprunning.
6.Sparkplugwireisnotconnected.
6.Checkthesparkplugwireconnection.
1.Aircleanerisdirty.
1.Cleanorreplacetheaircleanerelement.
2.Oillevelinthecrankcaseislow.
2.Addoiltothecrankcase.
3.Ventholeinthefuelcapisplugged.
3.Cleanorreplacethefuelcap.
4.Dirtinfuellter.4.Replacethefuellter.
5.Dirt,water,orstalefuelisinthefuel
system.
5.ContactanAuthorizedServiceDealer.
Enginelosespower.
6.Theundersideofthelawnmowerdeck
containsclippingsanddebris.
6.Cleantheundersideofthelawnmower
deck.
1.Thewireisnotconnectedtothespark
plug.
1.Connectthewiretothesparkplug.
2.Faultysparkplug.
2.Clean,adjustorreplacesparkplug.
3.ThethrottleleverisnotintheFast
position.
3.MovethethrottlelevertotheFast
position.
Enginerunsrough.
4.Theairlterelementisdirtyandis
restrictingtheairow .
4.Cleantheairlterpre-cleanerand/or
replacethepaperairlter.
1.Thebladeisbentorisoutofbalance.1.Balancetheblade.Ifthebladeisbent,
replaceit.
2.Theblademountingboltisloose.2.Tightentheblademountingbolt.
3.Theundersideofthelawnmowerdeck
containsclippingsanddebris.
3.Cleantheundersideofthelawnmower
deck.
Lawnmowerorenginevibratesexcessively.
4.Theenginemountingboltsareloose.4.Tightentheenginemountingbolts.
1.Allfourwheelsarenotatthesameheight.
1.Placeallfourwheelsatthesameheight.
2.Thebladeisdull.2.Sharpenandbalancetheblade.
3.Mowinginthesamepatternrepeatedly.
3.Changethemowingpattern.
Unevencuttingpattern.
4.Theundersideofthelawnmowerdeck
containsclippingsanddebris.
4.Cleantheundersideofthelawnmower
deck.
1.ThethrottleleverisnotintheFast
position.
1.MovethethrottlelevertotheFast
position.
2.Cuttingtoomuchgrassinonepass2.Raisethecuttingheight.Ifnecessary,cut
asecondtimeatlowercuttingheight.
3.Mowingtoofast.
3.Slowdown.
4.Thegrassiswet.
4.Allowthegrasstodrybeforemowing.
Dischargechuteplugs.
5.Theundersideofthelawnmowerdeck
containsclippingsanddebris.
5.Cleantheundersideofthelawnmower
deck.
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