ICS 680GC User manual

F/N 525746 Jan 09 © 2009 ICS, Blount Inc.
680GC
OPERATOR’S MANUAL

F/N 525746 Jan 09 © 2009 ICS, Blount Inc.
TITLE680GC OPERATOR’S MANUAL
3
TABLE OF CONTENTS
SYMBOLS & LABELS 4
SAFETY 5
TECHNICAL SPECIFICATIONS 8
SET-UP 9
OPER ATION 12
MAINTENANCE 17
TROUBLESHOOTING 24
REFERENCE 25

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SYMBOLS & LABELS
THE FOLLOWING SYMBOLS & DEFINITIONS ARE FOUND THROUGHOUT THIS MANUAL AND
ARE DESIGNED TO MAKE YOU AWARE OF POTENTIAL HAZARDS OR UNSAFE PRACTICES.
A potentially hazardous situation exists which, if not avoided,
could result in death or serious injury.
A potentially hazardous situation exists which, if not avoided,
may result in minor or moderate injury or property damage.
A potential situation exists which, if not avoided, may result in
product or property damage.
THE FOLLOWING SYMBOLS & LABELS MAY BE FOUND IN THIS MANUAL OR ON THE SAW
Read the operator’s manual carefully and understand the
contents before you use this equipment.
Always use:
• Protective helmet
• Ear protection
• Protective glasses or full face protection
Wear hand protection
IMPORTANT
WARNING
CAUTION

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SAFETY
WARNING
THE FOLLOWING SYMBOL APPLIES TO ALL THE ITEMS LISTED ON THIS PAGE
A potentially hazardous situation exists which, if not avoided,
could result in death or serious injury.
Diamond chain breakage can result in high-speed ejection of parts, which can result in death
or serious personal injury to operators or bystanders. The items listed below are critical to
minimizing the risk of diamond chain breakage and injury.
• DO NOT operate a diamond chainsaw with a damaged, modified, broken, or missing side
cover, bottom guard, or guard flap. The side cover, bottom guard, and guard flap provides
protection against contact with moving parts, ejected debris, broken diamond chain,
thrown water and concrete slurry.
• DO NOT operate a saw with loose, missing, damaged or improperly repaired parts.
• DO NOT insert a chain-based cut-off saw into a slot narrower than the diamond
chain segments. Rapid pushback might occur. Reference: Most diamond segments
are .225 inches (5.72 mm) wide.
• DO NOT use damaged, modified or improperly repaired diamond chain.
• DO NOT run a chain-based cut-off saw upside-down. Concrete debris can fly back into
the operator’s face.
• DO NOT cut ductile iron pipe with a chain-based cut-off saw. Segment loss or diamond
chain breakage may occur.

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SAFETY
CAUTION
THE FOLLOWING SYMBOL APPLIES TO ALL ITEMS LISTED ON THIS PAGE
A potentially hazardous situation exists which, if not avoided,
may result in minor or moderate injury or property damage.
• Always turn a chain-based cut-off saw OFF when performing maintenance on the saw
including diamond chain tensioning.
• Never use equipment that is not functioning properly. Have the cut-off saw repaired by
qualified service personnel.
• Turn engine OFF before refueling. Keep away from open flame. Always provide adequate
ventilation when handling fuel. Move chain-based cut-off saw at least 10 feet (3 m) away
from refueling area before starting.
• SealPro®diamond chains require a minimum water pressure of 20 psi (1.5 bar).
Insufficient water supply may result in excessive wear to the diamond chain, which
can lead to loss of strength and diamond chain breakage.
• Never start a chain-based cut-off saw unless the guide bar,
diamond chain and side cover are properly installed.
GENERAL SAFETY PRECAUTIONS
• Alwayswearprotectiveclothing,includinghardhat,eyeprotection,hearingprotection,
andgloves.
• Avoidloosefittingclothing.
• Performsafetychecksbeforestartingeachday.
• Alwaysoperatetoolwithsolidfootingandwithbothhandsoncut-offsaw.
• Removeorcontrolslurrytopreventslipperyconditionswhilecutting.
• Besuretherearenoobstructions(plumbing,electricalconduit,airducts)andno
unnecessarypeoplepresent.
• Setupawell-markedsafetyzonewitharopedboundaryandclearsigns.
• Provideadequateventilationwhenworkinginanenclosedarea.Breathingexhaustgases
isdangerous.
• Toavoidelectrocution,checkforliveelectricalwiringnearcuttingarea.

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SAFETY
IMPORTANT
THE FOLLOWING SYMBOL APPLIES TO ALL ITEMS LISTED ON THIS PAGE
A potential situation exists which, if not avoided, may result
in product or property damage.
Note: The chain-based cut-off saw is equipped with a two-stroke engine and must always be
run using a mixture of gasoline and ICS®two-stroke engine oil. It is important to accurately
measure the amount of oil to be mixed to ensure that correct mixture is obtained. When
mixing small amounts of fuel, even small inaccuracies can drastically affect the ratio of
the mixture.
• This engine is designed to be operated on premium unleaded gasoline.
• Use high quality, unleaded gasoline with a minimum octane rating of 90. If lower octane
gasoline is used, engine temperature will increase which will result in a piston seizure
and damage to the engine.
• Fuel mixture: 25:1 gasoline/oil mixture. Incorrect fuel mixture is the number one cause
of piston seizure.
• Use ICS®brand two-stroke engine oil.
• Never use two-stroke oil formulated for water-cooled two-cycle engines, such as
outboard motor oil.
• Never use motor oil intended for four-stroke engines.
• Use of water is required to cool bar and chain during break-in period.
ENGINE BREAK-IN
• It is very important to break-in a new engine to “seat” all moving parts, especially the
piston rings.
• To break-in the engine, run one full tank of 25:1 fuel at idle, cycling the throttle every
5 to 10 minutes to prevent loading.
• Failure to break-in an engine may result in piston seizure.
• Failure to break-in an engine at altitude will result in 50% loss of power output for the first
hour of operation making the initial cutting experience unsatisfactory.
• Proper chain tension, especially for first cut, is extremely important. Over-tensioning of
bar and chain, especially at altitude, could result in severe loss of power output making
initial cutting experience unsatisfactory.

© 2009 ICS, Blount Inc. F/N 525746 Jan 09
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TECHNICAL SPECIFICATIONS
EngineType 2-strokeSingleCylinderAirCooled
Displacement 4.9cu-in(80cc)
Horsepower 5.7HP(4.2kw)@9,000RPM
Torque 37.2in-lbs(4.2Nm)
EngineSpeed 11,500+/-500rpm
2,800-3,200rpmidle
DiamondChainSpeed Incut=4,000sfm
Noload=5,300sfm
Weight 21lbs(9.5kg)withguidebarand
diamondchain
CutDepth Upto12inches(30.5cm)
10inchessquare(25.4cm)
Dimensions
18inches(46cm)length
11.5inches(29cm)height
10inches(25cm)width
AirFilter Drynylon
Carburetor WalbroWJ85B,throttleshaftsealed,
pressurecompensating
Starter Dustandwatershielded
Ignition Specialwaterresistantelectronic
ignition
Clutch Three-weight,singlespring
Fuelratio 25:1gasoline-to-oil
FuelCapacity 0.23gal(.88liter)
15-18minutesruntimepertank
WaterSupply Minimum20psi(1.5bar)
NoiseLevel 101dBat3ft(1m)
VibrationLevel 10.5m/s2(fronthandle)
EngineBreak-inPeriod Onetank,withoutcutting,cycling
throttle
SparkPlug NGKBPMR8Y

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SET- UP
STEP1
Loosensidecovernutsandremoveside
cover.
GUIDE BAR AND DIAMOND CHAIN INSTALLATION
STEP4
Mountthediamondchainontheguidebar
startingatthedrivesprocketandcontinue
overtheguidebarnose.
STEP2
Removeshippingspacer.
Installthediamondchaincorrectly.
Ifusingasinglebumperchain,the
bumpermustalwaysleadthesegment
intothecutasshownhere.
STEP5
Installthesidecover.
STEP3
Placebarontostudsandchainadjustment
pin.

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SET- UP
GUIDE BAR AND DIAMOND CHAIN INSTALLATION
STEP8
Allchainshaveatendencytostretch
whenused.Diamondchainsstretchmore
thanwoodcuttingchainsbecauseofthe
abrasivematerialstheyarecutting.When
achainstretchestoapointwherethedrive
linksarehangingapproximately1/2”
(12mm)to3/4”(18mm)**belowthebar,
it’stimetotensionthechain.SeeNote2.
STEP7
Ifthechainistooloose,itcouldcomeoff
thebar,oritwillallowthedrivesprocketto
spinwithoutturningthechain,whichcan
chewupthechaindrivelinks.Ifthechain
istootight,alotofthesaw’spowergoes
intoturningthechainratherthanintothe
cut.Inextremeover-tightenedcases,the
sawmaynotbeabletoturnthechainat
all.Inaddition,damagecanoccurtothe
barnoseandprematurestretchmayoccur.
SeeNote1.
STEP9
Beforecutting,checkforpropertensionby
pullingthechainaroundthebarbyhand.If
youcannoteasilypullbyhand,thechainis
tootightandneedstobeloosenedalittle.
SeeNote3.
STEP6
Makesureallthedrivelinksareinside
theguidebargroovethenliftthebarnose
andtensionthechainbyturningthescrew
clockwise.

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SET- UP
Note1:Beawarethattheguidebarrailsmaydevelopsharpedgesovertimesoalwayspullthe
diamondchainbythediamondsegments.
Note2:Donot“overtension”thediamondchain.Lossofpowerwillresult.Itisnormalforthe
drivelinkstohangunderneaththeguidebar.Thediamondchainshouldbetightbutbeabletobe
pulledaroundtheguidebarbyhand.
Note3:Topreventchaintensionerbreakage,besurethesidecovernutsaretightenedto
approximately20ft-lbs(27Nm).
GUIDE BAR AND DIAMOND CHAIN INSTALLATION
STEP10
Continuetoliftuponthenoseoftheguide
barandfirmlytightenthesidecovernuts.
NOTE:Topreventchaintensioner
breakage,besurethesidecovernuts
aretightenedtoapproximately20ft-lbs
(27Nm).
STEP11
Attachtowatersourcewithpressureofnot
lessthan20psi(1.5bar).

© 2009 ICS, Blount Inc. F/N 525746 Jan 09
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OPER ATION
CAUTION
FUEL HANDLING
FUEL MIXTURE: 25:1 gasoline/oil mixture.
GASOLINE OIL
US
Gallon
US
Floz
1 5.2
2 1/2 12.8
5 25.6
GASOLINE OIL
Liters ml
1 40
5 200
10 400
20 800
• Usepremiumunleadedgasolinewithaminimumoctaneratingof90.Ifloweroctanegasoline
isused,enginetemperaturewillincreasewhichcanresultinapistonseizureanddamageto
theengine.
• Alwaysprovideadequateventilationwhenhandlingfuel.
• Usecautionwhenhandlinggasoline.Avoiddirectcontactwithskinorinhalingfuelvapor.
FUEL MIXING
• Alwaysmixgasolineandoilinacleancontainerintendedforusewithfuel.
• Keepfuelcontainerclosedtightlytopreventmoisturefromgettingintothefuel.
• Alwaysbeginmixingfuelbyaddinghalftheamountofgasolinetobeused.Thenaddthe
correctamountoftwo-strokeoilfor25:1mixtureandfinishfillingthecontainerwithgasoline.
• Donotmixmorethanonemonth’ssupplyoffuel.Thishelpspreventtheseparationofthe
two-strokeoilfromthegasoline(varnishing).
• Ifthecut-offsawisnotusedforanextendedperiodoftime(3months)thefueltankshouldbe
emptiedandcleaned.
FUELING
• Alwaysshutoffthecut-offsawbeforefueling.
• Beforefueling,cleantheareaaroundfuelcaptopreventdirtfromcontaminatingthefuel.
Contaminationofthefueltankcanleadtocut-offsawmalfunction.
• Thoroughlymixthefuelinit’scontainerbeforefueling.
• Slowlyopenthefuelcaptoreleaseanypressurethatmayhavebuilt-upinthetank.
• Afteraddingfuel,tightenthefuelcapcarefullyandsecurewithawrench.

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COLD ENGINE STARTING PROCEDURE
1. Toggletheignitionswitchtothe"ON"positionandpullthe
chokeleverout.
2. Lockthethrottleinthestartpositionbydepressingthetrigger
(A)andtriggerinterlock(B)atthesametime.
3. Depressandholdthrottlelockbutton(C)whilereleasingthe
triggerandtriggerinterlockinsuccession.
4. Pressdecompressionvalve(D).
5. Openthewatervalve1/4turn.
6. Placethe680GCCut-OffSawonthegroundmakingsurethe
chainisfreeofanyobstructions.
7. Placerightfootonthebaseoftherearhandle.
8. Placelefthandonfronthandle.
9. Withrighthand,slowlypullstarterhandleuntilthestarter
pawlsengage.
10.Pullthestartercord(hard, fast, short pulls)untilenginefires
or"pops"-shouldbe1to7pulls.
11. Pushthechokeleverin.
12.Checkdecompressionvalve.Pressifnecessary.
13.Pullthestartercorduntilenginestarts-shouldbe1to2pulls.
14.Whentheenginestarts,allowtheenginetoidle.Pullonthe
throttletriggerseveraltimestohelpwarmuptheengine.
15.Openthewatervalvecompletely.
CAUTION
OPER ATION
STARTING AND STOPPING A CHAIN-BASED CUT-OFF SAW
Never start a chain-based cut-off saw without the guide bar,
diamond chain and side cover properly assembled. The clutch
may come loose and cause personal injury.
Always move a chain-based cut-off saw at least 10 feet (3 m)
away from the fueling area before starting.
Place the chain-based cut-off saw on clear ground. Ensure that
secure footing is established and diamond chain is not contacting
any objects.
IMPORTANT
WARNING
WARM ENGINE STARTING PROCEDURE
1. Usethesameprocedureasstartingcoldengine,butDO NOT pull choke lever out.Ifchokeisused,
thecarburetorwillfloodwithgas.
2. Iftheenginedoesnotstartin3hard,fastpullswiththethrottlelocked,unlockthethrottleandpullthe
startercord3moretimes.
Note:Toholdthetriggerfullyopenitmaybenecessarytoinsertrightfootintorearhandleopening
andtwist.
Figure1:a-Trigger,b-trigger
interlock,c-throttlelock
CB
A
Figure2:Decompressionvalve
D

© 2009 ICS, Blount Inc. F/N 525746 Jan 09
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OPER ATION
PRE-CUT CHECKLIST
• ProperDiamondChainInstallation:Thebumpershouldleadthesegmentintothecut.
• ProperDiamondChainTension:Thediamondchainshouldbetightbuteasilypulledaround
theguidebarbyhand.
• Ensureallsafetydevicesareproperlymountedandfunctionalandthatallcontrolsarein
properworkingorder.
• Besuretherearenoobstructions(plumbing,electricalconduit,airducts)andnounnecessary
peoplepresent.
• Alwayswearprotectiveclothing,includinghardhat,eyeprotection,hearingprotection,non-slip
safetyboots,andgloves.Avoidwearingloosefittingclothing.
• DiamondchainswithSealPro®requireaminimumwaterpressureof20psi(1.5bar).
PLANNING THE CUT
• Outlinethecutwithapermanentmarkerforavisualcuttingguide.
• Avoidpinchingtheguidebaranddiamondchain.Alwayscutthebottomofanopeningfirst,
thentop,andthenthesides.Savetheeasiestcutforlast.
• Forthestraightestcutsusethe“StepCut”method.Firstscoretheentirecutlineapproximatelya
half-inchdeepusingthenoseoftheguidebar.Next,deepenthecutbyabouttwoinches.Then
plungeallthewaythroughandcompletethecutusingtheWallwalker®.
• Besurecutconcretecannotfallandinjureoperatororbystanders.Concreteisveryheavy,
onecubicfoot=12”x12”x12”=150lbs.(30cmx30cmx30cm=68kg).
• Checkforliveelectricalwiringnearthecuttingareaorintheconcretetoavoidelectrocution.

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OPER ATION
CUTTING WITH THE 680GC CUT-OFF SAW
Tostartacut,holdtriggeronfullthrottleandslowlyplungethenoseoftheguidebarstraightintothe
wall.LengthenthecutandengagethepointofthefixedWallwalker®.UsethefixedWallwalker®asa
pivotpointandpullupontherearhandletorotatetheguidebarintothecut.
CUTTING TIPS
• Alwaysoperatethechain-basedcut-offsawatfullthrottle.Applyenoughfeedforcesothatthe
freerunningRPMdrops20to30%.Iftoomuchforceisapplied,thecut-offsawwilllugorstall.
Thediamondchainwillnothaveenoughspeedtocuteffectively.Iftoolittlefeedforceisapplied,
thediamondswillskidandglazeover.
• Forstraightercutsusethe“stepcut”method.Firstscoretheentirecutlinewiththenoseofthe
guidebarapproximately1/2inch(12mm)to1inch(25mm)deep.Next,deepenthecutbyabout
2inches(50mm).Thisgroovewillhelpguidetheguidebarforastraightcut.Thenplungeallthe
waythroughandcompletethecutusingthefixedWallwalker®.
• Plungecutinsteadofstartingatthetopofthewall.Thiswillreducechatter,extenddiamondlife,
createastraightercutandmorequicklyenabletheuseoftheWallwalker®.
• UsethefixedWallwalker®tohelpcutmoreefficiently
andreduceoperatorfatigue.ThefixedWallwalker®is
afulcrumthatcanbeusedtoapplyadditionalforce
whencutting.Tousecorrectly,plungeintothewall
andsimplyengagethepointofthefixedWallwalker®
intothecutandpryupwardwiththerearhandle.
• Asthecut-offsawbeginstorotateup,feedforceis
developeddownthelineoftheintendedcut.Once
thecut-offsawisfullyrotatedupwards,pullthe
cut-offsawoutofthecutafewinchesandre-engage
thepickintothecutandrepeat.
• Whencuttingheavyrebar,slowly”rock”thecut-offsawsothatyou’realwayscuttingconcrete
aswellassteel.Thiswillhelpkeepthediamondsexposed.Also,expectlessdiamondchainlife
whencuttingheavyrebar.
• Expectmorediamondchainstretchwhenmakingnoseburiedcutsforextendedperiodsoftime,
asthediamondchaindoesnothaveachanceto“throw”theslurryawayfromthenoseofthe
guidebar.
• Ifthecut-offsawbeginstocutconsistentlycrooked,turntheguidebaroverandusetheother
side.Dresswornrailswithbeltsander.Note:Thenormallifeofaguidebaris2to3diamond
chains.Heavyrebarcanshortenguidebarlife.
• Whenusinganewdiamondchain,youcanincreasethecuttingspeedby“openingupthe
diamonds”.Makeafewcutsinanabrasivematerialsuchasacinderblock.
WallWalker®point

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OPER ATION
SYSTEM CLEAN-UP
• Aftercutting,runthesawforatleast15secondswiththewaterontoflushslurryanddebrisfrom
diamondchain,guidebaranddrivesprocket.
• Washconcreteslurryfromcut-offsawassembly.
• Avoidgettinganywaterinthecarburetororexhaustsystem.Ifwaterentersexhaustport,point
theguidebartipdownandpullthestarterhandleseveraltimestoexpelwaterfrommuffler.
• Removeguidebaranddiamondchain.Flushoutthechaintensionerwithhighwaterpressure
andlubricatewithgrease.
• Aftercleaningthecut-offsaw,spraytheentiresawbody,diamondchain,guidebar,anddrive
sprocketwithlightweightoil.Usinglightweightoilonthecut-offsawwillminimizerustandhelp
reduceslurrybuildup.

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MAINTENANCE
Follow these simple maintenance guidelines
and the 680GC Cut-Off Saw will keep running at its very best.
AFTER EACH USE
1. Rinsethesaw,guidebaranddiamondchainwithwater.
2. FollowinstructionsontheDailyMaintenanceLabel,locatedontheairfiltercover.
3. Inspectandtightenallfastenersasnecessary.
4. Inspectdrivesprocketfortoothwearandreplaceiftoothtipsarepointed.
5. Inspectthestartercord.Replaceiffrayed.
6. Cleanairfilter.Inspecttheairfilterforholes.Replaceasnecessary.
7. Spraysaw,guidebar,andchainwithlightweightoil.
8. Greasethechaintensioner.
AFTER 10 HOURS OF USE
1. Removethestartercoverandlubricatethestarterrecoilspring.Cleantheflywheelfins
andthestarterpawlswithawirebrush,thengreasethestarterpawls.
2. Removethesparkplugandcleanwithawirebrush.Checktheelectrodegap.
Thecorrectgapis0.020inches(0.5mm).
AFTER 40 HOURS OF USE
1. Changethesparkplug.Adjusttheelectrodeto0.020inches(0.5mm).
2. Checkthefuelfilterlocatedinsidethefueltank.Cleanorreplaceifclogged.

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MAINTENANCE
AIR FILTER
IMPORTANT
STARTER HOUSING ASSEMBLY
It is common for concrete slurry to get inside the starter housing
assembly during cutting. This can cause the starter pawls to stick
and not engage when the rope is pulled.
IMPORTANT
• Aftereachusage,thoroughlyflushthestarterhousing
assemblywithwater.(Figure3)
• Lubricatethestarterpawlsbysprayinglightweightoilintothe
starterhousingthroughthevents.(Figure3)
• Checkthestartercordforfraying,replaceifnecessary.
Figure3
The air filter is made from a nylon micro mesh air filter and an
internal spit-back screen. Both must be kept clean for the engine
to operate properly. If the saw is not reaching full RPM, most
likely one or both of the air filters are dirty.
• Theairfilter(Figure1)shouldbefreeofholesandwhite
incolor.
• Replaceairfilterwhendirty.
• Thespit-backscreen(Figure2)shouldbefreeofholes
andbewhiteincolor.Cleanwithmildsolventorgasoline
anddrywithhighpressureair.Ifspit-backscreenisdirty
thesawwillnotreachfullRPM.
• Duringre-assembly,tightenairfilterwing-nut"fingertight"
plusan1/8"ofaturnwithwrench.
Figure1
Figure2

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MAINTENANCE
TENSIONING THE RECOIL SPRING
• Liftthestartercordupintothenotchonthestarterpulley
(Figure3)andwindthepulleyclockwise5fullturns.
Removethecordfromthepulleynotchwhilepinchingthe
pulley.Releasethepulleyslowlyallowingittowindtherope
counterclockwiseontothepulley.
• Whencompleted,thestarterhandleshouldbepulledbackin
thestarterhousingunderit’sowntension.
• Tocheckthatthestarterpulleywasassembledcorrectly,pull
thecordcompletelyoutofthehousing,gripthepulleyandturn
clockwiseanother1/2turn.Ifthepulleyturnsanother1/2turnit
iscorrectlyassembled.
Figure2
STARTER HOUSING ASSEMBLY
• Toreattachthestarterhousing,firstpullthestartercordout,
thenholdthestarterhousingagainstthecrankcase(Figure3).
Slowlyreleasethestartercordtoenablethepulleytofit
betweenthepawls.
• Insertandtightenthescrews.UseblueLoctite®#242.
Figure3
STARTER CORD REPLACEMENT
• Removethe4screwsthatattachthestarterassemblytothe
crankcase.
• Pullthecordoutapproximately8”andliftthecordupintothe
notchinthepulley(Figure1).Relaxtherecoilspringbyplacing
thumbonpulleyandgentlyallowthepulleytounwindentirely.
Undothescrewinthecenterofthepulleyandremovethe
pulley.
• Threadthenewcordthroughthestartercoverandfastenit
tothepulley.Wind4turnsofthestartercordontothepulley.
Assemblethestarterpulleyagainsttherecoilspringsotheend
ofthespringengagesintothebacksideofthepulley.Installthe
retainingscrewinthecenterofthepulley. Figure1

© 2009 ICS, Blount Inc. F/N 525746 Jan 09
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MAINTENANCE
DRIVE SPROCKET
The drive sprocket (rim sprocket) is a wear item and should be
replaced every 2-3 diamond chains.
IMPORTANT
The needle bearing inside the splined adapter should be greased
regularly and should be replaced with each new clutch cup.
IMPORTANT
Arimsprocketsystem(Figure2)consistsofaclutchcup
w/splinedadapterandarimsprocket.Whentherimsprocket
wearsout,itistheonlypartthatneedstobereplaced.Theclutch
cupwithsplinedadapterisawearitemthatneedsreplacement
after3to5rimsprocketshavebeenused.
• Inspecttherimsprocketforwear.Replacetherimsprocketif
thedriveteethbecomepointed.
• Checkthedrivesprocketbearingbyspinningclutchcup.
Replacethebearingifitiswornout.
• Theneedlebearingonthedriveshaftmustbegreased
regularly,usehighqualitywater-resistantbearinggrease. Figure2
Clutch
Cup
Splined
Adapter
Rim
Sprocket
CHAIN TENSIONER
The chain tensioner (Figure 1) can become clogged with concrete
slurry during cutting. After each use thoroughly flush the chain
tensioner with water and apply a liberal amount of grease.
IMPORTANT
Most Common Causes of Tensioner Damage:
• Sidecovernutsarenottightenough.Sidecovernuts
shouldbetorquedto20ft-lbs(27Nm).
• Chaintensioningisattemptedwithoutloosening
thesidecovernuts.
• Concretedebrisintensionerpocket.
Figure1
Chain
Tensioner