Toro Power Clear 721 QZE Snowthrower User manual

FormNo.3438-776RevA

POWERCLEAR®721/821

SnowthrowerServiceManual

Published:July2020

8111LyndaleAvenueSouth

Bloomington,MN55420

OriginalInstructions(EN)

Contactusatwww.Toro.com.

AllRightsReserved

RevisionHistory

RevisionHistoryPage2POWERCLEAR®721/821Snowthrower

ServiceManual

3438-776RevA

Preface

ThisservicemanualwaswrittenexpresslyforToroservicetechnicians.TheT oroCompanyhasmade

everyefforttomaketheinformationinthismanualcompleteandcorrect.

Basicshopsafetyknowledgeandmechanical/electricalskillsareassumed.TheT ableofContentslists

thesystemsandtherelatedtopicscoveredinthismanual.

Wearehopefulthatyouwillndthismanualavaluableadditiontoyourserviceshop.Ifyouhaveany

questionsorcommentsregardingthismanual,pleasecontactusatthefollowingaddress:

TheToroCompany

RLC/SWSCustomerCareDepartment

8111LyndaleAvenueSouth

Bloomington,MN55420

TheT oroCompanyreservestherighttochangeproductspecicationsormakechangestothismanual

withoutnotice.

POWERCLEAR®721/821Snowthrower

ServiceManual

Page3Preface

3438-776RevA

ServiceProcedureIcons

ThefollowingiconsappearthroughoutthisServiceManualtobringattentionto

specicimportantdetailsofaserviceprocedure.

CriticalProcess

Thisiconisusedtohighlight:

•Installingsafetyequipment(shields,guards,seatbelts,brakes,andR.O.P .S.

components)thatmayhavebeenremoved

•Dimensionsorsettingsthatmustbemaintainedforpropermachineoperation

•Aspecicfastenertighteningsequence

•Componentorientationthatmaynotbeobvious

CriticalTorque

Thisiconisusedtohighlightanassemblytorquerequirementthatisdifferent

thanwhatisrecommendedintheStandardTorqueTables.

FluidSpecications

Thisiconisusedtohighlightuidspecicationsandcapacitiesthatareless

common,andmaynotappearonthemachineservicedecalorinthemachine

Operator’sManual.

Note:RefertotheservicedecalonthemachineandthemachineOperator’s

Manualforcommonlyuseduidspecicationsandcapacities.

PrefacePage4POWERCLEAR®721/821SnowthrowerServiceManual

3438-776RevA

TableofContents

Preface................................................................................................................3

Chapter1:Safety............................................................................................1–1

SafetyInstructions.......................................................................................1–2

Chapter2:SpecicationsandMaintenance....................................................2–1

Specications...............................................................................................2–2

TorqueSpecications...................................................................................2–3

Chapter3:Troubleshooting.............................................................................3–1

GeneralTroubleshooting..............................................................................3–3

Chapter4:Engine...........................................................................................4–1

GeneralInformation.....................................................................................4–2

ServiceandRepairs.....................................................................................4–3

Chapter5:Chassis..........................................................................................5–1

GeneralInformation.....................................................................................5–2

ServiceandRepairs.....................................................................................5–3

Chapter6:DriveSystem.................................................................................6–1

GeneralInformation.....................................................................................6–2

ServiceandRepairs.....................................................................................6–3

POWERCLEAR®721/821Snowthrower

ServiceManual

Page5Preface

3438-776RevA

PrefacePage6POWERCLEAR®721/821SnowthrowerServiceManual

3438-776RevA

Chapter1

Safety

TableofContents

SafetyInstructions................................................................................................................................1–2

ThinkSafetyFirst...............................................................................................................................1–2

POWERCLEAR®721/821SnowthrowerServiceManualPage1–1Safety

3438-776RevA

SafetyInstructions

DANGER

Thissafetysymbolmeansdanger.Whenyouseethissymbol,

carefullyreadtheinstructionsthatfollow.Failuretoobeythe

instructionscouldcauseseriouspermanentinjury,disability,or

death.

WARNING

Thissafetysymbolmeanswarning.Whenyouseethissymbol,

carefullyreadtheinstructionsthatfollow.Failuretoobeythe

instructionscanresultinseriousinjury.

CAUTION

Thissafetysymbolmeanscaution.Whenyouseethissymbol,

carefullyreadtheinstructionsthatfollow.Failuretoobeythe

instructionscanresultinminortomoderateinjuryand/ordamage

topropertyorequipment.

ThinkSafetyFirst

Avoidunexpectedstartingofengine…

Alwaysturnofftheengine,removetheignitionkeyanddisconnectthesparkplug

wire(s)beforecleaning,adjusting,orrepair.

Avoidlacerationsandamputations…

Stayclearofallmovingpartswhenevertheengineisrunning.Treatallnormally

movingpartsasiftheyweremovingwhenevertheengineisrunningorhas

thepotentialtostart.

Avoidburns…

Donottouchtheengine,mufer,orothercomponents,whichmaybehotduring

operation,whiletheunitisrunningorshortlyafterithasbeenrunning.

Avoidresandexplosions…

Useextremecareinhandlingfuel.Itisammableanditsvaporsareexplosive.

Extinguishallcigarettes,cigars,pipes,andothersourcesofignition.Avoid

spillingfuelandneversmokewhileworkingwithanytypeoffuelorlubricant.

Wipeupanyspilledfueloroilimmediately.Neverremovethefuelcaporadd

fuelwhentheengineisrunning.Alwaysuseapproved,labeledcontainersfor

storingortransportingfuelandlubricants.Donotaddordrainfuelinanenclosed

space.Donotstorethemachineorfuelcontainerwherethereisanopename,

spark,orpilotlight,suchasonawaterheaterorotherappliance.

Avoidasphyxiation…

Donotoperateanengineinaconnedareawithoutproperventilation.

Avoidinjuryfrombatteries…

Safety:SafetyInstructionsPage1–2POWERCLEAR®721/821SnowthrowerServiceManual

3438-776RevA

ThinkSafetyFirst(continued)

Batteryacidispoisonousandcancauseburns.Avoidcontactwithskin,eyes

andclothing.Batterygasescanexplode.Keepcigarettes,sparksandames

awayfromthebattery.

Avoidinjuryduetoinferiorparts…

Useonlyoriginalequipmentpartstoensurethatimportantsafetycriteriaaremet.

Avoidinjurytobystanders…

Alwayscleartheareaofbystandersbeforestartingortestingpowered

equipment.

Avoidinjuryduetoprojectiles…

Alwayscleartheareaofsticks,rocksoranyotherdebristhatcouldbepickedup

andthrownbythepoweredequipment.

Avoidmodications…

Neveralterormodifyanypartunlessitisafactoryapprovedprocedure.

Avoidunsafeoperation…

Alwaystestthesafetyinterlocksystemaftermakingadjustmentsorrepairson

themachine.RefertotheElectricalsectioninthismanualformoreinformation.

Avoidelectricalshock…

Nevertouchelectricalwiresorcomponentswhiletheengineisrunning.They

canbesourcesofshock.De-energizethesystemifyouarehavingtodorepairs.

Iftestingelectricalcomponentsensureyouareworkinginadryenvironment.

HydraulicSystem...

Releaseallpressureinthehydraulicsystembeforeperforminganyworkon

thesystem.Keepyourbodyandhandsawayfrompin-holeleaksornozzles

thatejecthydraulicuidunderhighpressure.Donotuseyourhandstosearch

forleaks.Hydraulicuidescapingunderpressurecanhavesufcientforceto

penetrateundertheskinandcauseseriousinjury.Seekmedicalattentionright

awayifhydraulicuidgetsintheskin.

PersonalProtectiveEquipment…

Tiebacklonghair,anddonotwearlooseclothingorjewelry.Useappropriate

personalprotectiveequipment(PPE)forprotectingyourselffrompotential

hazardsintheenvironmentinwhichyouwillwork.Eachprocessoutlinedinthis

manualmayneeddifferentPPEtoprotecttheserviceperson.Usetheproper

PPEforthetaskathand.

Tools…

Alltoolsshouldbeinproperworkingorder.Donotusetoolsthatarebrokenorin

disrepair.Usethepropertoolfortheproperapplication.

Lifts,Hoists,andJacks…

Alllifts,hoists,andjacksshouldbeusedinaccordancewiththemanufacturer

information.Inspectlifts,hoists,andjackspriortouse.Donotoverloadlifts,

hoists,andjacks.Donotworkunderasuspendedload.Ensurechockblocks

areusedonequipmentthatcanmove.Useliftsorjacksandjackstandsthat

areratedtosupportthetotalweightofthemachineandanyattachments.Do

notrelyonjackstosupportthemachine.Ifyouareunsureoftheoperationof

anylifts,hoists,andjacksdonotuse.

FireExtinguishers…

POWERCLEAR®721/821SnowthrowerServiceManualPage1–3Safety:SafetyInstructions

3438-776RevA

ThinkSafetyFirst(continued)

Theproperclassofreextinguishershouldbeusedincaseofre.

ClassAextinguishersareforordinarycombustiblematerialssuchaspaper,

wood,cardboard,andmostplastics.Thenumericalratingonthesetypesof

extinguishersindicatestheamountofwateritholdsandtheamountofreitcan

extinguish.Geometricsymbol(greentriangle).

ClassBresinvolveammableorcombustibleliquidssuchasgasoline,

kerosene,greaseandoil.ThenumericalratingforclassBextinguishers

indicatestheapproximatenumberofsquarefeetofreitcanextinguish.

Geometricsymbol(redsquare).

ClassCresinvolveelectricalequipment,suchasappliances,wiring,circuit

breakersandoutlets.NeverusewatertoextinguishclassCres-theriskof

electricalshockisfartoogreat!ClassCextinguishersdonothaveanumerical

rating.TheCclassicationmeanstheextinguishingagentisnon-conductive.

Geometricsymbol(bluecircle).

ABCreextinguishersareadrychemicaltypeusedformultiplepurposes.See

aboveinformationfordescription.Ensurereextinguishersareserviceableand

replaceanythataredischargedoroutofinspectiondates

Safety:SafetyInstructionsPage1–4POWERCLEAR®721/821SnowthrowerServiceManual

3438-776RevA

Chapter2

SpecicationsandMaintenance

TableofContents

Specications.......................................................................................................................................2–2

TorqueSpecications...........................................................................................................................2–3

EquivalentsandConversions.............................................................................................................2–8

U.S.toMetricConversions................................................................................................................2–9

POWERCLEAR®721/821SnowthrowerServiceManualPage2–1SpecicationsandMaintenance

3438-776RevA

Specications

POWERCLEAR®721/825

ModelNamePowerClear

721R/E

Commercial

PowerClear721

CommercialPower

Clear821

PowerClear721

QZE

PowerClear

821QZE

Model38752/3875338754387553875638757

ClearingWidth8.27cm(21

inches)

8.27cm(21inches)withExtended

LifePaddles8.27cm(21inches)

SnowCutDepth4.92cm(12.5inches)

Engine212ccT oroPremiumOHV252ccT oro

PremiumOHV

212ccToro

PremiumOHV

252ccT oro

PremiumOHV

EngineModelG210FS-4/

G210FDS-4G210FS-4G250FS-4G210FDS-4G250FS-4

OilType&

Capacity

0.5L(17oz)

10W30/5W30

Synthetic

0.5L(17oz)

10W30/5W30

Synthetic

0.7L(23.7oz)10W

30/5W30Synthetic

0.5L(17oz)

10W30/5W30

Synthetic

0.7L(23.7oz)

10W30/5W30

Synthetic

HighIdleRPM3700±100

IgnitionCoilAir

Gap0.3–0.5mm(0.011-0.019inches)

SparkPlugNGKBPR6ES

SparkPlugGap0.7-0.8mm(0.028-0.032inches)

FuelCapacity2.16L(2.3quarts)2.93L(3.1quarts)2.16L(2.3quarts)2.93L(3.1quarts)

StartingRecoil/

Recoil-ElectricRecoilRecoil-Electric

Throwing

DistanceUpto10.7m(35ft)

Capcity/Min.Upto816kg(1800lb)Upto861.8kg

(1900lb)

Upto816kg

(1800lb)

Upto861.8kg

(1900lb)

AugerSystemPowerCurve

HandleErgonomicErgonomic&ReinforcedHandleErgonomic

Deector

ControlZipDeector

ChuteControlChuteMountedQuickShoot

ChuteRotation210º

DriveSystemPowerPropelSelf-Propel

ScraperPivoting

Weight36kg/38kg(80

lb/84lb)37kg(82lb)41kg(91lb)39kg(87lb)44kg(96lb)

Overall

Dimensions48inchLx21inchWx42inchH

Storage

Dimensions33inchLx21inchWx34inchH

SpecicationsandMaintenance:SpecicationsPage2–2POWERCLEAR®721/821SnowthrowerServiceManual

3438-776RevA

TorqueSpecications

Therecommendedfastenertorquevaluesarelistedinthefollowingtables.For

criticalapplications,asdeterminedbyToro,eithertherecommendedtorqueora

torquethatisuniquetotheapplicationisclearlyidentiedandspeciedinthe

servicemanual.

Thesetorquespecicationsfortheinstallationandtighteningoffastenersshall

applyforallfastenerswhichdonothaveaspecicrequirementidentiedin

theservicemanual.Thefollowingfactorsshallbeconsideredwhenapplying

torque:cleanlinessofthefastener,useofathreadsealant(Loctite),degreeof

lubricationonthefastener,presenceofaprevailingtorquefeature,hardness

ofthesurfaceunderneathofthefastener’shead,orsimilarconditionwhich

affectstheinstallation.

Asnotedinthefollowingtables,torquevaluesshouldbereducedby25%for

lubricatedfastenerstoachievethesimilarstressasadryfastener.Torquevalues

mayalsohavetobereducedwhenthefasteneristhreadedintoaluminumor

brass.Thespecictorquevalueshouldbedeterminedbasedonthealuminum

orbrassmaterialstrength,fastenersize,lengthofthreadengagement,etc.

Thestandardmethodofverifyingtorqueshallbeperformedbymarkingalineon

thefastener(headornut)andmatingpart,thenbackofffastener1/4ofaturn.

Measurethetorquerequiredtotightenthefasteneruntilthelinesmatchup.

FastenerIdentication

InchSeriesBoltsandScrews

g272208

Figure1

1.Grade13.Grade8

2.Grade5

POWERCLEAR®721/821SnowthrowerServiceManualPage2–3SpecicationsandMaintenance:TorqueSpecications

3438-776RevA

MetricBoltsandScrews

g272209

Figure2

1.Class8.82.Class10.9

SpecicationsandMaintenance:TorqueSpecicationsPage2–4POWERCLEAR®721/821SnowthrowerServiceManual

3438-776RevA

StandardTorqueforDry,ZincPlated,andSteelFasteners(InchSeries)

ThreadSizeGrade1,

5,&8

Fasteners

withThin

HeightNuts

SAEGrade1Bolts,Screws,

Studes&Semswith

RegularHeightNuts(SAE

Grade2orBetterNut)

SAEGrade5Bolts,Screws,

Studs&SemswithRegular

HeightNuts(SAEGrade

5orBetterNut)

SAEGrade8Bolts,Screws,

Studs&SemswithRegular

HeightNuts(SAEGrade

8orBetterNut)

in-lbin-lbN•cmin-lbN•cmin-lbN•cm

#6-32UNC15±2169±2323±3260±34

#6-40UNF10±213±2147±2317±2192±2325±3282±34

#8-32UNC29±3328±3441±5463±56

#8-36UNF13±225±5282±3031±4350±4543±5486±56

#10-24UNC42±5475±5660±6678±68

#10-32UNF18±230±5339±5648±5542±5668±7768±79

1/4-20UNC48±753±7599±79100±101130±113140±151582±169

1/4-28UNF53±765±10734±113115±121299±136160±171808±192

5/16-18UNC115±15105±151186±169200±252260±282300±303390±339

5/16-24UNF138±17128±171446±192225±252542±282325±333672±373

ft-lbft-lbN•mft-lbN•mft-lbN•m

3/8-16UNC16±216±222±330±341±443±558±7

3/8-24UNF17±218±224±335±447±550±668±8

7/16-14UNC27±327±337±450±568±770±795±9

7/16-20UNF29±329±339±455±675±877±8104±11

1/2-13UNC30±348±765±975±8102±11105±11142±15

1/2-20UNF32±453±772±985±9115±12120±12163±16

5/8-11UNC65±1088±12119±16150±15203±20210±21285±28

5/8-18UNF75±1095±15129±20170±18230±24240±24325±33

3/4-10UNC93±12140±20190±27265±27359±37375±38508±52

3/4-16UNF115±15165±25224±34300±30407±41420±43569±58

7/8-9UNC140±20225±25305±34430±45583±61600±60813±81

7/8-14UNF155±25260±30353±41475±48644±65667±66904±89

Note:Reducetorquevalueslistedinthetableaboveby25%forlubricatedfasteners.Lubricated

fastenersaredenedasthreadscoatedwithalubricantsuchasoil,graphite,orthreadsealantsuch

asLoctite.

Torquevaluesmyhavetobereducedwheninstallingfastenersintothreadedaluminumorbrass.The

specictorquevalueshouldbedeterminedbasedonthefastenersize,thealuminumorbasematerial

strength,lengthofthreadengagement,etc.

ThenominaltorquevalueslistedaboveforGrade5and8fastenersarebasedon75%oftheminimum

proofloadspeciedinSAEJ429.Thetoleranceisapproximately±10%ofthenominaltorquevalue.

Thinnutsincludejamnuts.

POWERCLEAR®721/821SnowthrowerServiceManualPage2–5SpecicationsandMaintenance:TorqueSpecications

3438-776RevA

StandardTorqueforDry,ZincPlated,andSteelFasteners(MetricSeries)

Class8.8Bolts,Screws,StudswithRegular

HeightNuts(Class8orStrongerNuts)

Class10.9Bolts,Screws,StudswithRegular

HeightNuts(Class10orstrongerNuts)

ThreadSize

in-lbN•cmin-lbN•cm

M5X0.857±6644±6878±8881±90

M6X1.096±101085±113133±141503±158

ft-lbN•mft-lbN•m

M8X1.2519±226±328±338±4

M10X1.538±452±554±673±8

M12X1.7566±790±1093±10126±14

M16X2.0166±17255±23229±23310±31

M20X2.5325±33440±45450±46610±62

Note:Reducetorquevalueslistedinthetableaboveby25%forlubricatedfasteners.Lubricated

fastenersaredenedasthreadscoatedwithalubricantsuchasoil,graphite,orthreadsealantsuch

asLoctite.

Torquevaluesmayhavetobereducedwheninstallingfastenersintothreadedaluminumorbrass.The

specictorquevalueshouldbedeterminedbasedonthefastenersize,thealuminumorbasematerial

strength,lengthofthreadengagement,etc.

Thenominaltorquevalueslistedabovearebasedon75%oftheminimumproofloadspeciedinSAE

J1199.Thetoleranceisapproximately±10%ofthenominaltorquevalue.Thinheightnutsincludejam

nuts.

SpecicationsandMaintenance:TorqueSpecicationsPage2–6POWERCLEAR®721/821SnowthrowerServiceManual

3438-776RevA

SAEGrade8SteelSetScrews

RecommendedTorque

ThreadSize

SquareHeadHexSocket

1/4-20UNC140±20in-lb73±12in-lb

5/16-18UNC215±35in-lb145±20in-lb

1/2-13UNC75±15ft-lb50±10ft-lb

3/8-16UNC35±10ft-lb18±3ft-lb

WheelBoltsandLugNuts

ThreadSizeRecommendedTorque**

7/16-20UNFGrade565±10ft-lb88±14N•m

1/2-20UNFGrade580±10ft-lb108±14N•m

M12X1.25Class8.880±10ft-lb108±14N•m

M12X1.5Class8.880±10ft-lb108±14N•m

**Forsteelwheelsandnon-lubricatedfasteners.

ThreadCuttingScrews(ZincPlatedSteel)

Type1,Type23,orTypeF

ThreadSizeBaselineTorque*

No.6-32UNC20±5in-lb

No.8-32UNC30±5in-lb

No.10-24UNC38±7in-lb

1/4-20UNC85±15in-lb

5/16-18UNC110±20in-lb

3/8-16UNC200±100in-lb

*Holesize,materialstrength,materialthicknessandnishmustbeconsideredwhendetermining

specictorquevalues.Alltorquevaluesarebasedonnon-lubricatedfasteners.

ConversionFactors

in-lbX11.2985=N•cm

ft-lbX1.3558=N•m

N•cmX0.08851=in-lb

N•cmX0.73776=ft-lb

ThreadCuttingScrews(ZincPlatedSteel)

ThreadsperInch

ThreadsSize

TypeATypeBBaselineTorque*

No.6182020±5in-lb

No.8151830±5in-lb

No.10121638±7in-lb

No.12111485±15in-lb

*Holesize,materialstrength,materialthicknessandnishmustbeconsideredwhendetermining

specictorquevalues.Alltorquevaluesarebasedonnon-lubricatedfasteners.

POWERCLEAR®721/821SnowthrowerServiceManualPage2–7SpecicationsandMaintenance:TorqueSpecications

3438-776RevA

EquivalentsandConversions

DecimalandMillimeterEquivalents

FractionsDecimalsmmFractionsDecimalsmm

1/640.0156250.39733/640.51562513.097

1/320.031250.79416/320.5312513.484

3/640.0468751.19135/640.54687513.891

1/160.06251.5889/160.562514.288

5/640.0781251.98437/640.57812514.684

3/320.93752.38119/320.5937515.081

1/80.12503.1755/80.625015.875

9/640.1406253.57241/640.64062516.272

5/320.156253.96921/320.6562516.669

11/640.1718754.36643/640.67187517.066

3/160.18754.76211/640.687517.462

13/640.2031255.15945/640.70312517.859

7/320.218755.55623/320.7187518.256

15/640.2343755.95347/640.73437518.653

1/40.25006.3503/40.750019.050

17/640.2656256.74749/640.76562519.447

9/320.281257.14425/320.7812519.844

19/640.2968757.54151/640.79687520.241

5/160.31257.54113/160.812520.638

21/640.3281258.33453/640.82812521.034

11/320.343758.73127/320.8437521.431

23/640.3593759.12855/640.85937521.828

3/80.37509.5257/80.875022.225

25/640.3906259.92257/640.89062522.622

13/320.4062510.31929/320.9062523.019

27/640.42187510.71659/640.92187523.416

7/160.437511.11215/160.937523.812

29/640.45312511.50961/640.95312524.209

15/320.4687511.90631/320.9687524.606

31/640.48437512.30363/640.98437525.003

1/20.500012.70011.00025.400

1mm=0.03937in.0.001in.=0.0254mm

SpecicationsandMaintenance:TorqueSpecicationsPage2–8POWERCLEAR®721/821SnowthrowerServiceManual

3438-776RevA

U.S.toMetricConversions

ToConvertIntoMultiplyBy

MilesKilometers1.609

YardsMeters0.9144

FeetMeters0.3048

FeetCentimeters30.48

InchesMeters0.0254

InchesCentimeters2.54

LinearMeasurement

InchesMillimeters25.4

SquareMilesSquareKilometers2.59

SquareFeetSquareMeters0.0929

SquareInchesSquareCentimeters6.452

Area

AcreHectare0.4047

CubicYardsCubicMeters0.7646

CubicFeetCubicMeters0.02832

Volume

CubicInchesCubicCentimeters16.39

Tons(Short)MetricTons0.9078

PoundsKilograms0.4536 Weight

OuncesGrams28.3495

PressurePounds/SquareInchKilopascal6.895

Foot-PoundsNewton-Meters1.356

Foot-PoundsKilogram-Meters0.1383

Work

Inch-PoundsKilogram-Centimeters1.152144

QuartsLiters0.9463

LiquidVolumeGallonsLiters3.785

LiquidFlowsGallons/MinuteLiters/Minute3.785

1.Subtractby32°

TemperatureFahrenheitCelsius2.Multiplyby5/9

POWERCLEAR®721/821SnowthrowerServiceManualPage2–9SpecicationsandMaintenance:TorqueSpecications

3438-776RevA

SpecicationsandMaintenance:TorqueSpecicationsPage2–10POWERCLEAR®721/821SnowthrowerServiceManual

3438-776RevA

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