Craftsman 37031 - Engine and Component Maintenance

Alwaysstopengine,disconnectsparkplugwire,andgroundagainst
enginebeforeperformingany typeof maintenanceon yourmachine.
GENERAL RECOMMENDATIONS
• Alwaysobservesafetyruleswhenperformingany maintenance.
• Thewarrantyon thislawnmowerdoesnotcoveritemsthathave
beensubjectedto operatorabuseor negligence.To receivefull
valuefromwarranty,operatormustmaintaintheequipmentas
instructedhere.
• Changingofengine-governedspeedwill voidenginewarranty.
• Alladjustmentsshouldbecheckedat leastonceeach season.
• Periodicallycheckall fastenersandmakesurethesearetight.
ENGINE MAINTENANCE
Spark Plug
Forgoodperformance,the sparkplugmustbeproperlygappedand
freeof deposits.Replacethe sparkplugannually.
1. Disconnectthe capfromthe sparkplug,andremoveanydirt from
thesparkplugarea.
2. Usethepropersizesparkplugwrenchto removethesparkplug.
f
Electrode
Figure15
NOTE:Replacewitha Champion®RJ2YXLEsparkplug.
3. Checkthegapwitha wire gauge.SeeFigure15.Sparkpluggap
shouldbe0.020in(0.51ram).If necessary,resetthe gap.
4. installandtightenthesparkplugto therecommendedtorque(180
Ib-in[20 Nm]).
5. Attachthe sparkplugcapto thesparkplug.
Air Cleaner
A dirtyaircleanerwillrestrictairflowto thecarburetorandcausepoor
engineperformance,inspectthe filtereachtimetheengineisoper-
ated.Youwillneedto cleanthe filtermorefrequentlyif youoperatethe
enginein verydustyareas.
Cleantheair cleanerevery25hoursofoperationoroncea season.
Replacetheaircleanerannually.
Neverstartor runtheenginewiththe aircleanerassemblyor theair
filterremoved.
Figure16
NOTE:Do notuse pressurizedairor solventsto cleanthe filter.Pres-
surizedair candamagethefilterandsolventswill dissolvethefilter.
1. Loosenthe fastenerthatholdsthe coverandtilt plastichousing
coveron sideof enginedown.SeeFigure16.
2. Removeairfilterfromplastichousingcover.
3. Toloosendebris,gentlytap thefilterona hardsurface,if thefilter
isexcessivelydirty, replacewitha newfilter.
4. insertcover'stabsinto slotsin bottomofbase.
5. Tiltcoverupintoplaceand securewithfastener.
15