Toro 51851 Operator's Manual

FormNo.3440-127RevB

Flex-ForcePowerSystem
(16in)60VMAXChainsaw

ModelNo.51851—SerialNo.320000001andUp

™

41cm

Registeratwww.T oro.com.
OriginalInstructions(EN)

*3440-127*

Forassistance,pleasesee
www.Toro.com/support
forinstructionalvideos
orcontact1-888-384-9939
beforereturningthis
product.

WARNING

CALIFORNIA

Proposition65Warning

Thepowercordonthisproductcontains

lead,achemicalknowntotheState

ofCaliforniatocausebirthdefects

orotherreproductiveharm.Wash

handsafterhandling.

Useofthisproductmaycauseexposure

tochemicalsknowntotheStateof

Californiatocausecancer,birthdefects,

orotherreproductiveharm.

Important:Withyourmobiledevice,youcan

scantheQRcode(ifequipped)ontheserial
numberplatetoaccesswarranty ,parts,andother
productinformation.

g315697

Figure1

1.Modelandserialnumberlocation.

Introduction

Thischainsawisdesignedforcuttingtreebranches,
logs,andwoodenbeamsofadiameternolongerthan
thecuttinglengthoftheguidebar.Itistobeused
onlybyadults.ItisdesignedtouseT oroFlex-Force
lithium-ionbatterypackModels88620(includedwith

51851),88625,88640,88660,or88675.These
batterypacksaredesignedtobechargedonlyby
batterychargerModels88602,88605,or88610
(providedwithModel51851).Usingtheseproducts
forpurposesotherthantheirintendedusecouldprove
dangeroustoyouandbystanders.

Readthisinformationcarefullytolearnhowtooperate
andmaintainyourproductproperlyandtoavoid
injuryandproductdamage.Youareresponsiblefor
operatingtheproductproperlyandsafely .

Visitwww.Toro.comformoreinformation,including
safetytips,trainingmaterials,accessoryinformation,
helpndingadealer,ortoregisteryourproduct.

ModelNo.

SerialNo.

Thismanualidentiespotentialhazardsandhas
safetymessagesidentiedbythesafety-alertsymbol
(Figure2),whichsignalsahazardthatmaycause
seriousinjuryordeathifyoudonotfollowthe
recommendedprecautions.

sa-black

Figure2

Safety-alertsymbol

Thismanualuses2wordstohighlightinformation.
Importantcallsattentiontospecialmechanical
informationandNoteemphasizesgeneralinformation
worthyofspecialattention.

Wheneveryouneedservice,genuineToroparts,or
additionalinformation,contactanAuthorizedService
DealerorToroCustomerServiceandhavethemodel
andserialnumbersofyourproductready.Figure1
identiesthelocationofthemodelandserialnumbers
ontheproduct.Writethenumbersinthespace
provided.

©2021—TheToro®Company
8111LyndaleAvenueSouth
Bloomington,MN55420

Contactusatwww.Toro.com.

2

PrintedinChina

AllRightsReserved

Contents

Safety.......................................................................3

PersonalProtectiveEquipment..........................6

SafetyandInstructionalDecals..........................7

Setup........................................................................9

FillingtheChainSawwithBarandChain

Oil...................................................................9

ProductOverview.....................................................9

Specications..................................................10

Attachments/Accessories.................................10

Operation................................................................10

BeforeUsingtheChainSaw.............................10

StartingtheChainSaw......................................11

ShuttingOfftheChainSaw................................11

CuttingwiththeChainSaw...............................12

PruningaTree..................................................13

FellingaTree....................................................13

LimbingaFallenTree.......................................15

BuckingaLog...................................................16

InstallingtheBatteryPack................................17

RemovingtheBatteryPack..............................17

ChargingtheBatteryPack................................18

Maintenance...........................................................19

RecommendedMaintenanceSchedule(s)...........19

CheckingtheOilLevelandAddingBarand

ChainOil.......................................................19

CheckingtheChainBrake................................20

CheckingtheFlowofBarandChain

Oil.................................................................20

AdjustingtheChainT ension.............................21

ServicingtheGuideBar,Chain,andDrive

Sprocket........................................................22

InstallingtheGuideBarandChain....................23

SharpeningtheChain.......................................23

Service.............................................................23

Storage...................................................................24

PreparingtheBatteryPackfor

Recycling......................................................24

Troubleshooting......................................................25

Safety

WARNING

Readallsafetywarningsandallinstructions.

Failuretofollowthewarningsandinstructions
mayresultinelectricshock,reand/orserious
injury.

Saveallwarningsandinstructionsforfuture
reference.

Theterm“powertool”inallthewarningsrefers
toyourmains-operated(corded)powertoolor
battery-operated(cordless)powertool.

IMPORTANTSAFETY
INSTRUCTIONS

I.Workareasafety

1.Keepworkareacleanandwelllit.Cluttered

ordarkareasinviteaccidents.

2.Donotoperatepowertoolsinexplosive
atmospheres,suchasinthepresenceof
ammableliquids,gasses,ordust.Power

toolscreatesparks,whichmayignitethedust
orfumes.

3.Keepchildrenandbystandersawaywhile
operatingapowertool.Distractionscancause

youtolosecontrol.

II.Personalsafety

1.Stayalert,watchwhatyouaredoing,and
usecommonsensewhenoperatingapower
tool.Donotuseapowertoolwhileyouare
tiredorundertheinuenceofdrugs,alcohol,
ormedication.Amomentofinattentionwhile

operatingpowertoolscouldresultinserious
personalinjury.

2.Usepersonalprotectiveequipment.Always
weareyeprotection.Protectiveequipment

suchasadustmask,non-skidsafetyshoes,
hardhat,orhearingprotectionusedfor
appropriateconditionsreducespersonalinjuries.

3.Preventunintentionalstarting.Ensure
theswitchisintheOFF-positionbefore
connectingtopowersourceand/orbattery
pack,pickinguporcarryingthetool.Carrying

powertoolswithyourngerontheswitchor
energizingpowertoolsthathavetheswitchon
invitesaccidents.

4.Removeanyadjustingkeyorwrenchbefore
turningthepowertoolon.Awrenchorakey

leftattachedtoarotatingpartofthepowertool
mayresultinpersonalinjury.

3

5.Donotoverreach.Keepproperfootingand

balanceatalltimes.Thisenablesbettercontrol
ofthepowertoolinunexpectedsituations.

6.Dressproperly.Donotwearlooseclothing
orjewelry .Keepyourhair,clothing,and
glovesawayfrommovingparts.Loose

clothes,jewelry,orlonghaircangetcaughtin
movingparts.

7.Ifdevicesareprovidedfortheconnection
ofdustextractionandcollectionfacilities,
ensurethattheseareconnectedand
properlyused.Useofdustcollectioncan

reducedust-relatedhazards.

III.Powertooluseandcare

1.Donotforcethepowertool.Usethecorrect
powertoolforyourapplication.Thecorrect

powertoolwilldothejobbetterandsaferatthe
rateforwhichitwasdesigned.

2.Donotusethepowertooliftheswitch
doesnotturnitonandoff.Anypowertool

thatcannotbecontrolledwiththeswitchis
dangerousandmustberepaired.

3.Disconnecttheplugfromthepowersource
and/orthebatterypackfromthepowertool
beforemakinganyadjustments,changing
accessories,orstoringpowertools.Such

preventivesafetymeasuresreducetheriskof
startingthepowertoolaccidentally.

4.Storeidlepowertoolsoutofthereachof
children,anddonotallowpersonsunfamiliar
withthepowertoolortheseinstructions
tooperatethepowertool.Powertoolsare

dangerousinthehandsofuntrainedusers.

5.Maintainpowertools.Checkfor
misalignmentorbindingofmovingparts,
breakageofparts,andanyothercondition
thatmayaffectthepowertool’soperation.
Ifdamaged,havethepowertoolrepaired
beforeuse.Manyaccidentsarecausedby

poorlymaintainedpowertools.

6.Keepcuttingtoolssharpandclean.Properly
maintainedcuttingtoolswithsharpcuttingedges
arelesslikelytobindandareeasiertocontrol.

7.Usethepowertool,accessories,andtoolbits
etc.inaccordancewiththeseinstructions,
takingintoaccounttheworkingconditions
andtheworktobeperformed.Useofthe

powertoolforoperationsdifferentfromthose
intendedcouldresultinahazardoussituation.

IV.Batterytooluseandcare

1.Rechargeonlywiththechargerspeciedby
themanufacturer.Achargerthatissuitablefor

onetypeofbatterypackmaycreateariskofre
whenusedwithanotherbatterypack.

2.Usepowertoolsonlywithspecically
designatedbatterypacks.Useofanyother

batterypacksmaycreateariskofinjuryandre.

3.Whenbatterypackisnotinuse,keepitaway
fromothermetalobjects,likepaperclips,
coins,keys,nails,screwsorothersmall
metalobjects,thatcanmakeaconnection
fromoneterminaltoanother.Shortingthe

batteryterminalstogethermaycauseburnsor
are.

4.Underabusiveconditions,liquidmaybe
ejectedfromthebattery;avoidcontact.If
contactaccidentallyoccurs,ushwithwater.
Ifliquidcontactseyes,additionallyseek
medicalhelp.Liquidejectedfromthebattery

maycauseirritationorburns.

5.Donotuseabatterypackortoolthatis
damagedormodied.Damagedormodied

batteriesmayexhibitunpredictablebehaviour
resultinginre,explosionorriskofinjury .

6.Donotexposeabatterypackortooltore
orexcessivetemperature.Exposuretoreor

temperatureabove130°C(265°F)maycause
explosion.

7.Donotexposeabatterypackortooltorain
orwetconditions.Waterenteringapowertool

willincreasetheriskofelectricshock.

8.Followallcharginginstructionsanddo
notchargethebatterypackortooloutside
thetemperaturerangespeciedinthe
instructions.Chargingimproperlyorat

temperaturesoutsidethespeciedrangemay
damagethebatteryandincreasetheriskofre.

V.Service

1.Haveyourpowertoolservicedbya
qualiedrepairpersonusingonlyidentical
replacementparts.Thisensuresthatthesafety

ofthepowertoolismaintained.

2.Neverservicedamagedbatterypacks.

Serviceofbatterypacksshouldonlybe
performedbythemanufacturerorauthorized
serviceproviders.

4

VI.Chainsawsafety

1.Keepallpartsofthebodyawayfromthe
sawchainwhenthechainsawisoperating.
Beforeyoustartthechainsaw,makesure
thesawchainisnotcontactinganything.

Amomentofinattentionwhileoperatingchain
sawsmaycauseentanglementofyourclothing
orbodywiththesawchain.

2.Alwaysholdthechainsawwithyourright
handontherearhandleandyourlefthand
onthefronthandle.Holdingthechainsawwith

areversedhandcongurationincreasestherisk
ofpersonalinjuryandshouldneverbedone.

11.Keephandlesdry,clean,andfreefromoil
andgrease.Greasy ,oilyhandlesareslippery

causinglossofcontrol.

12.Cutwoodonly .Donotusechainsawfor
purposesnotintended.Forexample:donot
usechainsawforcuttingplastic,masonry
ornon-woodbuildingmaterials.Useofthe

chainsawforoperationsdifferentthanintended
couldresultinahazardoussituation.

13.Avoidkickback.Kickbackmayoccurwhenthe
noseortipoftheguidebartouchesanobject,or
whenthewoodclosesinandpinchesthesaw
chaininthecut.

3.Holdthepowertoolbyinsulatedgripping
surfacesonly,becausethesawchainmay
contacthiddenwiring.Sawchainscontacting

a″live″wiremaymakeexposedmetalpartsof
thepowertool″live″andcouldgivetheoperator
anelectricshock.

4.Wearsafetyglassesandhearingprotection.
Furtherprotectiveequipmentforhead,
hands,legs,andfeetisrecommended.

Adequateprotectiveclothingwillreduce
personalinjurybyyingdebrisoraccidental
contactwiththesawchain.

5.Donotoperateachainsawinatree.

Operationofachainsawwhileupinatreemay
resultinpersonalinjury.

6.Alwayskeepproperfootingandoperate
thechainsawonlywhenstandingonxed,
secureandlevelsurface.Slipperyorunstable

surfacessuchasladdersmaycausealossof
balanceorcontrolofthechainsaw.

7.Whencuttingalimbthatisundertensionbe
alertforspringback.Whenthetensioninthe

woodbresisreleasedthespringloadedlimb
maystriketheoperatorand/orthrowthechain
sawoutofcontrol.

8.Useextremecautionwhencuttingbrushand
saplings.Theslendermaterialmaycatchthe

sawchainandbewhippedtowardyouorpull
youoffbalance.

Tipcontactinsomecasesmaycauseasudden
reversereaction,kickingtheguidebarupand
backtowardyou.

Pinchingthesawchainalongthetopofthe
guidebarmaypushtheguidebarrapidlyback
towardyou.

Eitherofthesereactionsmaycauseyoutolose
controlofthesaw,whichcouldresultinserious
personalinjury.Donotrelyexclusivelyuponthe
safetydevicesbuiltintoyoursaw.Asachain
sawuser,youshouldtakeseveralstepstokeep
yourcuttingjobsfreefromaccidentorinjury.

Kickbackistheresultoftoolmisuseand/or
incorrectoperatingproceduresorconditionsand
canbeavoidedbytakingproperprecautionsas
givenbelow:

•Maintainarmgrip,withthumbsand

ngersencirclingthechainsawhandles,
withbothhandsonthesawandposition
yourbodyandarmtoallowyoutoresist
kickbackforces.Kickbackforcescan

becontrolledbytheoperator,ifproper
precautionsaretaken.Donotletgoofthe
chainsaw.

•Donotoverreachanddonotcutabove

shoulderheight.Thishelpsprevent
unintendedtipcontactandenablesbetter
controlofthechainsawinunexpected
situations.

9.Carrythechainsawbythefronthandlewith
thechainsawswitchedoffandawayfrom
yourbody.Whentransportingorstoringthe
chainsawalwaysttheguidebarcoverand
removethebattery.Properhandlingofthe

chainsawwillreducethelikelihoodofaccidental
contactwiththemovingsawchain.

10.Followinstructionsforlubricating,chain
tensioning,andchangingaccessories.

Improperlytensionedorlubricatedchainmay
eitherbreakorincreasethechanceforkickback.

•Onlyusereplacementbarsandchains

speciedbythemanufacturer.Incorrect
replacementbarsandchainsmaycause
chainbreakageand/orkickback.

•Followthemanufacturer’ssharpening

andmaintenanceinstructionsforthesaw
chain.Decreasingthedepthgaugeheight

canleadtoincreasedkickback..

SAVETHESE
INSTRUCTIONS

5

PersonalProtective
Equipment

Figure3

1.Wearahardhatin
situationswheredebris
maycontactthehead.

2.Wearhearingprotection5.Wearprotectivepantsor

3.Wearsafetyglasses
and/orafaceshield

4.Weargloves

chaps

6.Wearsubstantial,
slip-resistantfootwear

g316566

6

SafetyandInstructionalDecals

Safetydecalsandinstructionsareeasilyvisibletotheoperatorandarelocatednearanyarea
ofpotentialdanger.Replaceanydecalthatisdamagedormissing.

1.Thebatterypackis
charging.

2.Thebatterypackisfully
charged.

144-3094

3.Thebatterypackisover
orundertheappropriate
temperaturerange.

4.Batterypackchargingfault

decal144-3094

144-3098

decal144-3098

decal144-3096

144-3096

decal144-3090

144-3090

decal144-3091

144-3091

7

decal137-9461

137-9461

1.Batterychargestatus

decal140-8475

140-8475

1.ReadtheOperator’s
Manual.

2.Call2Recycle®battery

3.Keepawayfromopenre
orames.

4.Donotexposetorain.

recyclingprogram

140-2162

1.ReadtheOperator’sManual.6.Stayawayfrommovingparts.

2.Wearhearingprotection.7.Keepallguardsandshieldsinplace.

3.Weareyeprotection.8.Donotcontactobjectswiththeguidebartip;tipcontactcan

4.Donotexposetorain.9.Alwaysuse2handswhenoperatingthechainsaw.

5.Cuttinghazardofhand.

causeseriouspersonalinjury.

decal140-2162

8

Setup

Important:Thebatterypackisnotfullycharged

whenitispurchased.Beforeusingthemachine
forthersttime,refertoChargingtheBattery

Pack(page18).

FillingtheChainSawwith
BarandChainOil

Important:Useonlybarandchainoil(sold

separately).

Fillthechainsawwithbarandchainoil;referto

CheckingtheOilLevelandAddingBarandChain
Oil(page19).

ProductOverview

Figure4

Leftsideshown

1.Chain

2.Guidebar

3.Oilwindow

4.Oilcap

5.Fronthandle10.Buckingteeth

6.Batterypack

7.Buttonlatch

8.Triggerlock

9.Trigger

g315699

Figure5

Rightsideshown

1.Chainbrake4.Multitool(locatedbeneath

2.Sidecover5.Chaintensioningscrew

3.Captivecovernut6.Guidebarcover

Figure6

1.BatterychargerModel
88610(includedwith
Model51851)

rearhandle)

2.BatterypackModel88620
(includedwithModel

51851)

g315700

g330065

9