Echo CS-305 User manual

X7503205500 X750008780
12/05
Chain Saw
InstructionManual
MODELS : CS-305
CS-306
WARNING DANGER
Readrulesforsafeoperationandinstructionscarefully.ECHOprovidesanInstruction
ManualandaSafety Manual.Bothmustbereadandunderstoodforproperandsafe
operation.

2
RULES FOR SAFE OPERATION
A. Kickback Safety Precaution for Chain Saw Users
WARNING!
KICKBACKmayoccurwhen thenose ortip ofthe
guide bar touches an object, or when the wood
closesinand pinchesthe sawchainin thecut.
Tip contact in some cases may cause a lightning
fastreverse REACTION,Kicking theguidebarup
andbacktowards theoperator. Pinchingthesaw
chainalongthetopof theguide barmaypush the
guide bar rapidly back towards the operator. Ei-
therofthesereactionsmaycauseyoutolosecon-
trol of the saw which could result in serious per-
sonalinjury.
The Kick Guard ®device is not installed on the
guide bar when you purchase your ECHO chain
saw.TheKickGuard®canbeusedinamajorityof
cuttingoperations,andisespeciallyrecommended
forbeginners,homeowners,orchainsawnovices.
Mostcuttingoperationscanbeaccomplishedwith
theKickGuard®in place.
Donotrelyexclusivelyuponthesafetydevicesbuilt
intoyoursaw.Asachainsawuser,youshouldtake
several steps to keep your cutting jobs free from
accidentor injury.
1. With a basic understanding of kickback, you
canreduceoreliminatetheelementofsurprise.
Suddensurprisecontributestoaccidents.
2.Keep a good firm grip on the saw with both
hands, the right hand on the rear handle, and
theleft handonthefronthandle,whenthe en-
gineisrunning.Useafirmgripwiththumbsand
fingersencirclingthechain sawhandles.Afirm
grip will help you reduce kickback and main-
taincontrol ofthe saw.Don’t’let go.
3. Make sure that the area in which you are cut-
ting is free from obstructions. Do not let the
noseoftheguidebar contacta log,branch, or
anyotherobstruction whichcouldbe hitwhile
youareoperatingthesaw.
4. Cutathigh enginespeeds.
5. Donotoverreachorcutaboveshoulderheight.
6. Follow manufacturer’s sharpening and main-
tenanceinstructions forthe sawchain.
7. Onlyusereplacement barsandchains speci-
fiedby themanufacturerortheequivalent.
B. Other Safety Precautions
1. Donotoperateachainsawwithonehand!Se-
rious injury to the operator, helpers, bystand-
ers,oranycombinationof thesepersons may
resultfromone-handedoperation.Achainsaw
isintendedfortwo-handeduse.
2. Do not operate a chain saw when you are fa-
tigued.
3. Usesafetyfootwear; snug-fittingclothing; pro-
tectivegloves;andeye,hearing andheadpro-
tectiondevices.
4. Usecautionwhenhandlingfuel.Movethechain
sawatleast3m (10feet)fromthefuelingpoint
beforestartingtheengine.
5. Donotallowotherpersonstobenearthechain
sawwhenstartingorcuttingwiththechainsaw.
Keepbystandersand animals outofthe work
area.
6. Donotstartcuttinguntilyouhaveaclearwork
area,securefooting,andaplannedretreatpath
fromthe fallingtree.
Copyright©2005 ByEcho,Incorporated
All Rights Reserved.

3
7. Keepallpartsofyourbodyawayfromthesaw
chainwhen theengineisrunning.
8. Before you start the engine, make sure that
thesaw chainis notcontacting anything.
9. Carrythechainsaw withthe enginestopped,
the guide bar and saw chain to the rear, and
themufflerawayfromyourbody.
10.Donotoperate achainsaw that isdamaged,
improperly adjusted, or not completely and
securely assembled. Be sure that the saw
chain stops moving when the throttle control
trigger is released.
11. Shutofftheenginebeforesettingthechainsaw
down.
12.Useextremecaution when cuttingsmall size
brushandsaplingsbecauseslender material
may catch the saw chain and be whipped to-
wardyou orpull youoff balance.
13.When cutting a limb that is under tension, be
alert for spring back so that you will not be
struck when the tension in the wood fibers is
released.
14.Keep thehandles dry, clean,and freeofoil or
fuelmixture.
15.Operatethechain sawonlyin well-ventilated
areas.
16.Do not operate a chain saw in a tree unless
youhavebeen specificallytrainedto doso.
17.Allchainsawservice,otherthantheitemslisted
intheInstructionManualmaintenanceinstruc-
tions,shouldbeperformedbycompetentchain
saw service personnel. (For example, if im-
proper tools are used to remove the flywheel
or if an improper tool is used to hold the fly-
wheelin ordertoremovetheclutch,structural
damagetotheflywheelcould occurandcould
subsequentlycausetheflywheeltoburst.)
18.When transporting your chain saw, use the
appropriate guide bar scabbard.
19.SparkarrestormufflersapprovedtoSAEStan-
dard J335b are Standard on ECHO Chain
saws to reduce the possibility of forest fires.
Do not operate the chain saw with a loose or
defectivemuffler.Donotremovethesparkar-
restorscreen.
WARNING DANGER
•Duringoperation,themufflerorcatalyticmufflerandsurroundingcoverbecomehot.
•Neversuspendthesawonalanyardwiththeenginerunning.
•Alwaysuse thesaw fromthe right-handside ofyour body–NEVER fromtheleftside.
•Alwayswearpropersafetyclothingtoprotectyourlowerbodyfromsharpsawchainandhot
muffler.
•Alwayskeepexhaustareaclearofflammabledebrisduringtransportationorwhenstoring,
otherwiseseriouspropertydamageorpersonalinjurymayresult.
WARNING DANGER
Usingimproper replacement componentsor removing safetydevices mayresult in seriousor fatalinjury.

4
CONTENTS Page
RulesforSafe Operation..................................................................................................2
TechnicalData .................................................................................................................5
Emission Data .................................................................................................................6
Description ......................................................................................................................6
Nomenclatureof Parts......................................................................................................7
PreparationforUse..........................................................................................................8
Fueland Lubricant............................................................................................................9
Operation....................................................................................................................... 11
CuttingInstructions .........................................................................................................13
MaintenanceandCare...................................................................................................16
Chain and Guide Bar Combinations...............................................................................21
Troubleshooting..............................................................................................................23
Storage..........................................................................................................................24
Correct Use of Chain Brake ...........................................................................................26
ServicingInformation......................................................................................................28

5
TECHNICAL DATA
* Technical data subject to change without notice.
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12000 - 12500

6
EMISSION CONTROL
EMISSIONDATA
DESCRIPTION
TheECHOproductyoupurchasedhasbeenfactorypre-assembledforyourconvenience.Duetopackaging
restrictions, guide bar and saw chain installation and other assembly may be necessary.
Afteropeningthe carton,checkfor damage. Immediatelynotifyyour retailerorECHO Dealerofdamaged or
missing parts. Use the contents list to check for missing parts.
CONTENTS
1 - PowerHead
1 - GuideBar
1 - KickGuard
1 - Hex Head Bolt
1 - Hex Nut
1 - SawChain
1 - InstructionManual
1 - SafetyManual
1 - WarrantyRegistrationCard
1 - LimitedWarrantyStatement
1 - T-Wrench
PRODUCT EMISSION DURABILITY
The300 hour emission durability complianceperiod is the time spanselected by the manufacturer certifying
theengineemissionsoutputmeetsapplicableemissionsregulations,providedthatapprovedmaintenance
proceduresare followed as listed inthe Maintenance Section of thismanual.
EPA Phase 2/California Tier 2
The emission control system for these engines are EM (Engine Modification and Catalyst).
An Emission Control Label islocated on theengine. (These are EXAMPLESONLY, information onlabel
variesbyengineFAMILY).
IMPORTANTENGINEINFORMATION
ENGINEFAMILY: 6EHXS.0334RA DISPLACEMENT: 30.1CC
EMISSIONCOMPLIANCEPERIOD: 300 HOURS
THIS ENGINE MEETS U.S. EPA PH2 AND 2005 - 2006
CALIFORNIA EMISSION REGULATIONS FOR SOREs.
REFER TO OWNER'S MANUAL FOR MAINTENANCE
SPECIFICATIONS AND ADJUSTMENTS.

7
11
12
1. Fronthandle
2. Handguard
(Chainbrakeactuatinglever)
3. Sawchain
4. Guidebar
5. Chaincatcher
6. Sprocketguard
7. Muffler
8. Rearhandguard
9. Throttlecontrollockout
10. Throttlecontroltrigger
11. Aircleanercover
12. Chaintensionadjustmentscrew
13. Pull starter
14. Throttlecontrollatch
15. On / Off switch
16. Oil tank cap
17. Fuel tank cap
18. Purgebulb
19. Kick guard
20. Spark Plug
CS-305, 306 NOMENCLATURE OF PARTS
12
3
4
5
7
8
9
14
16
17
18
6
10
13
19
13
20
P/N 89016006361
TOAVOID KICKBACK
1. Hold the chain saw firmly with
both hands.
2. Don’t let the nose of the guide
bar contact any obstruction.
3. Tip contact may suddenly move
the guide bar upward and backward,
which may cause serious injury.
P/N89019130131
ADVERTENCIA PELIGRO
P/N89022839131
Esta unidad puede ser peligrosa y producir lesiones
personales graves si no se usa en forma adecuada.
Para reducir el riesgo de lesioarse, los operadores, los
ayudantes y los espectadores deben leer y comprender el Manual Del
Operador y los Manuales De Seguridad que se entregan escritos en
español.
REPLACEMENT BARANDCHAIN
Note:There may be other replacement
components for achieving
kickback protection. For details,
please refer to the chain and bar
combination sheetshownin the
instruction manual.
P/NX524000791
GUIDE BAR*CHAIN*
PARTNO. TYPE LINKS
12” 120374501 OREGON 91VG 45
14” 140375201 OREGON 91VG 52
* Ifa decal cannot beread,
anewonecanbeordered
fromyourECHOdealer.
15
WARNING!!
Read and follow all safety precautions in the
Instruction manual. Failure to follow instruc-
tions could result in serious personal injury.
CHAIN SAW 87G1
IN ACCORDANCE WITH
AMERICAN NATIONAL
STANDARDSAFETY
REQUIREMENTSFOR
GASOLINEPOWERED CHAIN SAWS
(ANSIB175.1-2000)

8
PREPARATION FOR USE
G
H
J
K
I
GUIDE BAR AND SAW CHAIN-INSTALL/
REMOVE
WARNING DANGER
SawChainissharp!Alwaysweargloveswhen
handlingassembly,otherwiseseriouspersonalinjury
may result.
1. Movechain brake lever fully rearward torelease
chainbrake.
IMPORTANT
Alwaysloosen guide bar nutsbefore turning chain
tensionadjuster,otherwise clutch coverand tensioner
willbe damaged.
2. Removetwo guide barnuts (I)and removesprocket
guard(J).
3. Removeguide bar andsaw chain if necessary.
NOTE:See“MAINTENANCEAND CARE”
instructions for guide bar, sprocket, and saw chain
maintenance.
4. Mount guide bar (G) on studs, and slide toward
sprocket to make saw chain installation easier.
5. Install saw chain (H) as shown, with cutters on top of
guidebarfacingforward.
IMPORTANT
Becertain tensioner fits into loweradjuster hole (K)
beforetighteningguidebarnuts.
NOTE
Movechainbrakeleverfullyrearwardtoinstall
sprocket guard to saw.
6. Installsprocket guard(J), and tightenguide bar nuts
(I)finger tight.
KICK GUARD® TO BAR INSTRUCTIONS
For saws with Kick Guard®P/N 2894901 and sym-
metrical or asymmetrical low-kick type guide bars.
1. Install bolt (A) in rear hole (B) of Kick Guard®and
throughfront hole(C) inguide bar.
2. IMPORTANT:Dimple in Kick Guard®(D) must
engagerecess in guidebar (E).
3. Tighten nut (F) and bolt (A) until snug. Make certain
Kick Guard®is flush against guide bar.
7. Turnsaw over and check brake bandfor correct
position around clutch drum. If brake band is not
inplace around drum,remove clutch cover,make
sure brake is released, and reinstall.
DANGER
Never operate saw if chain brake does not
function properly, otherwise saw damage
and serious personal injury could result.
See “Testing the Brake” instructions.
• Adjust saw chain tension, as instructed in “Adjust-
ment,ChainTension.”

9
L
ADJUSTMENT, CHAIN TENSION
IMPORTANT
Alwaysloosen guide bar nutsbefore turning chain
tensionadjuster,otherwise clutch coverand tensioner
willbe damaged.
1. Removesparkplug lead.
2. Loosen two guide bar nuts (I), if necessary.
3. Hold the bar nose up, and turn the adjuster screw (L)
clockwise until the chain touches the bottom of the
bar.
4. Tightenboth guidebar nuts withbar nose heldup.
IMPORTANT!
Tighten guide bar nuts to 90 – 110 kgf/cm (80 – 95
in. lbs.) DO NOT over-tighten nuts. Damage to saw
may result.
5. Pull the saw chain around the guide bar by hand.
Reduce chain tension, if you feel tight spots.
6. Keep chain properly tensioned at all times.
NOTE
Allchainsrequirefrequentadjustments.
FUEL AND LUBRICANT
NOTICE:Useofunmixed,improperlymixed,orfuelolder
than 90 days, (stale fuel), may cause hard starting, poor
performance,orsevereenginedamageandvoidtheproduct
warranty.Read andfollow instructionsin theStorage section
of this manual.
FUEL STATEMENT
GASOLINE - Use89 Octane [R+M/2](mid grade orhigher)
gasoline or gasohol known to be good quality. Gasohol may
contain up to 10% Ethyl (grain) alcohol or 15% MTBE (methyl
tertiary-butylether).Gasoholcontainingmethyl(wood)alcohol
isNOTapproved.
Two Stroke Oil - A two-stroke engine oil
meetingISO-L-EGD(ISO/CD13738)and
J.A.S.O. FC Standards must be used. Echo
brandpremiumPowerBlendTM Universal2-
Stroke Oil meets these standards. Engine
problemsduetoinadequatelubricationcaused
by failure to use an ISO-L-EGD and J.A.S.O. FC
certified oil, such as Echo premium Power
BlendTM,willvoidthe two-strokeenginewarranty.
(Emissionrelatedpartsonly are coveredfortwo
years, regardless of two-stroke oil used, per the
statement listed in the Emission Defect Warranty
Explanation.)

10
).S.U()CIRTEM(
SAGLIOSAGLIO
.laG.zo.lFretiL.cc
1
2
5
6.2
1.5
8.21
4
8
02
08
061
004
Fuel Mix Chart
50:1
Handling Fuel
WARNING DANGER
Fuel is VERY flammable. Use extreme care when mixing,
storing or handling or serious personal injury may result.
• Useanapprovedfuelcontainer.
• DONOTsmokenearfuel.
• DONOT allowflames orsparks nearfuel.
• Fuel tanks/cans may be under pressure. Always loosen fuel
caps slowly allowing pressure to equalize.
• NEVERrefuelaunitwhentheengineisHOTorRUNNING!
• DO NOT fill fuel tanks indoors. ALWAYS fill fuel tanks
outdoorsoverbareground.
• DO NOT overfill fuel tank. Wipe up spills immediately.
• Securely tighten fuel tank cap and close fuel container after
refueling.
• Inspect for fuel leakage. If fuel leakage is found, do not start
oroperate unit until leakageis repaired.
• Moveatleast3m(10ft.)fromrefuelinglocationbefore
starting the engine.
MixingInstructions
1. Fillanapprovedfuelcontainerwithhalfoftherequiredamount
ofgasoline.
2. Add the proper amount of 2-stroke oil to gasoline.
3. Close container and shake to mix oil with gasoline.
4. Add remaining gasoline, close fuel container, and remix.
IMPORTANT
Spilled fuel is a leading cause of hydrocar-
bon emissions. Some states may require
theuseof automaticfuelshut-off containers
toreducefuelspillage.
Afteruse
• DO NOT store a unit with fuel in its tank. Leaks
canoccur.Returnunusedfueltoanapproved
fuelstoragecontainer.
Storage - Fuel storage laws vary by locality.
Contactyourlocalgovernmentforthelaws
affecting your area. As a precaution, store fuel in
anapproved,airtight container.Storeinawell-
ventilated,unoccupiedbuilding,awayfromsparks
andflames.
IMPORTANT
Stored fuel ages. Do not mix more fuel than
you expect to use in thirty (30) days, ninety
(90) days when a fuel stabilizer is added.
IMPORTANT
Storedtwo-strokefuelmayseparate.
ALWAYSshakefuelcontainerthoroughly
beforeeachuse.
IMPORTANT
Echopremium PowerBlendTM Universal 2-StrokeOil maybe
mixed at 50:1 ratio for application in all Echo engines sold in
the past regardless of ratio specified in those manuals.
CHAIN LUBRICANT
Properlubrication ofthe chain whilein operationreduces friction
between the chain and the guide bar to a minimum and assures
alonger service life.
• use bar and chain oil of high quality for this purpose.
• Donot use usedor reclaimedoil to avoidvarious oiler
problems.
• Use ECHO bar and chain oil.
• When ECHO bar and chain oil is not available:
Use motor oil, etc.
• Usebar and chainoil ofthe following grades:
SAE NO. 30 ..... in summer
SAE NO. 10 ..... in winter or when cutting resinous trees.
• Whenrefueling, also refillchain oil.
FUELTANK OILTANK
TANKINDICATION

11
Securely hold the saw.
OPERATION
B
C
A
WHEN THE ENGINE IS COLD
WARNING DANGER
Make sure bar and chain are not touching anything when
starting the saw.
1. Movechain brake leverfully forwardto engage chainbrake
beforestarting.
2. Fill the fuel tank with fuel. Do not over fill.
3. Fill the chain oil tank with lubricant. Do not over fill.
4. Turnswitch (A)to “RUN” position(I).
5. Pull choke (B) all the way out (closed position).
6. Push purge bulb (C) 10 times.
7. Pull starter handle several times until first firing sound is
heard. (Secure unit on ground with your knee or foot.) (5 -
6 pulls maximum.)
8. Push choke (B) all the way in (open position)
9. Pullstarter handleagain.
NOTE
If engine does not start after 5 pulls, repeat instructions.
WHEN ENGINE IS HARD TO START
WARNING DANGER
Clutchengagesandchainmayrotatewhenengineisstarted
with throttle control latch engaged. Never use the throttle
controllatchforcutting.Use only whenstartingtheengine.
1. Ensure that there is fuel and chain oil in the tanks.
2. Movechainbrakeleverfullyforwardtoengagechainbrake
beforestarting.
3. Press throttle control lockout down, squeeze throttle
trigger, and push in throttle control latch.
4. Pullstarter handle.
5. When engine starts, immediately squeeze throttle trigger
to release the latch otherwise damage to clutch may
result.
NOTE
Do not pull starter rope out to the maximum possible
position.
Do not allow recoil handle to snap back against the
casing.

12
A
A
STARTING WARM ENGINE
1. Ensure that there is fuel and chain oil in the tanks. (If fuel
tankwas emptiedduring previousoperation, refilltank and
pushpurge bulb 10times.)
2. Movechainbrakeleverfullyforwardtoengagechainbrake
beforestarting.
3. Turnswitch (A)to “RUN” position(I).
4. Pullstarter handle.
5. Choke may be used if necessary, but be sure to push it
back on first firing sound.
NOTE
If engine does not start after 5 pulls, use cold start proce-
dure.
RUNNING
WARNING DANGER
The saw chain should not move at idle, otherwise serious
personalinjury may result.
NOTE
Ifsaw chainmovesadjust carburetoraccording to“Carbure-
torAdjustment” instructions in this manual, or see your
dealer.
• After engine starts, allow it to return to idle.
• Movechain brakelever fully rearwardto releasechain brake.
• Press throttle control lockout then gradually squeeze
throttletrigger to increase engine speed.
• Sawchain startsmoving whenthe engine reaches approxi-
mately4200 rpm.
• Ensureproper accelerationand lubricationof chainand bar.
• Do not run the engine at high speed unnecessarily.
• Be sure that saw chain stops moving when throttle trigger is
released.
STOPPING
1. Release throttle trigger and turn switch (A) to STOP (O)
position.
2. Movechainbrakeleverfullyforwardtoengagechain.
NOTE
If engine does not stop, pull choke out fully to stop engine.
Return the unit to your authorized ECHO dealer to check
andrepair stop switch before startingthe engine again.

13
WARNING DANGER
Read the ECHO “CHAIN SAW SAFETY MANUAL” included
with your chain saw for additional cutting and safety instruc-
tions. Failure to obey all instructions may result in serious or
fatalinjuries.
In all circumstances the operation of the chain saw is a one-
man job. It is difficult at times to take care for your own safety,
so don’t assume the responsibility for a helper as well.After
youhave learned the basic techniques of usingthe saw, your
best aid will be your own good common sense...
The accepted way to hold the saw is to stand to the left of the
sawwith your lefthand on the front handlebarand your right
handon the rear handleso you can operatethe throttle trigger
withyour rightindex finger.
Before attempting to fell a tree, cut some small logs or limbs.
Becomethoroughly familiar withthe controls andthe re-
sponses of the saw.
Start the engine, see that it is running properly. Squeeze the
trigger to open the throttle wide open and start the cut. If the
chainis properly sharpened, the cuttingshould be relatively
effortless. It is not necessary to press down hard to make the
saw cut. Pushing the saw too hard will slow the engine and
cutting will actually be more difficult.
NOTE
Somematerial may adversely affect thehousings of your
ECHOchain saw.
(Example:PalmTreeAcid,fertilizer, etc.)Toavoid housing
deterioration,carefully removeall packedsaw dust around
clutchand guide bararea and wash with water.
WARNING DANGER
Donot let thetip ofthe bar touchanything while theengine is
running.At cuttingspeed the chain is movingat ahigh rate of
speed. Should the tip contact a limb or log while the chain is
moving,thetipwill bepushedupwardwith considerableforce.
This is known as kickback.Avoid it!
Kickback
CUTTING INSTRUCTIONS
GENERAL

14
2”
45°
2”
FELLING A TREE
DIRECTION
OFFALL
Direction of fall Hinge
Fellingcut
First cut
Notch
Second cut
One-third tree
diameter
LIMBING
WARNING DANGER
A falling tree can cause serious injury or damage any-
thingitmay hit- acar, ahouse,a fence,a powerline,or
anothertree. There are waysto make a treefall where
you want it, so first decide where that is!
Beforecutting,clearthe areaaroundthe tree.You will need
goodfooting whileworking andyou should be able towork
the saw without hitting any obstacles. Next, select a path
of retreat. When the tree begins to fall you should retreat
awayfromthe directionof fallata 45degreeangle toavoid
the trunk kicking back over the stump.
Begin the cut on the side to which the tree is to fall. Cut a
notch about 1/3 of the way into the tree as shown. The
position of this notch is important since the tree will try to
fall “into” the notch. The felling cut is made on the side
oppositethenotchand atalevelabout 2”abovethe bottom
ofthe notch. Do not try to cut through to the notch with the
fellingcut. Theremaining wood between the notchcut and
felling cut (about 2”) will act as a hinge when the tree falls,
guiding it in the desired direction. When the tree starts to
fall,kill the engine,place thesaw on theground and make
your retreat quickly.
To fell big trees with a diameter exceeding twice the bar
length, start the notching cuts from one side and draw the
saw through to the other side of the notch. Start the back
cutonone sideofthe tree,pivotingthe saw throughtoform
the desired hinge on that side.
Thenremove the sawfor the secondcut. Insert thesaw in
the first cut, very carefully so as not to cause kickback.
Thefinal cutis madeby drawingthe sawforward inthe cut
to reach the hinge.
Limbing a fallen tree is much the same as bucking. Never
limbon the treethat you arestanding. When limbing,cau-
tion is the word. Be careful of the tip touching other limbs.
Always use both hands.

15
BUCKING
Uphillposition
FINISHCUT
FIRSTCUT Board or flat stones
KICKBACK
• Improper thrust cutting.
• When the bar nose hits another tree, etc.
Don’t cut with the saw overhead or the bar in a vertical posi-
tion. If the saw should kick back you may not have good
enoughcontrol toprevent possibleinjury.
Bucking is the sawing of a log or fallen tree into smaller
pieces. There are a few basic rules which apply to all
buckingoperations.
Keep both hands on the handles at all times.
Support logs if possible.
When cutting on a slope or hillside, always stand uphill.
Keepin mindthat the wood is heavyand thatit willbend and
pinchthe saw if improperly supported.
The trunk will weaken at the point where you make the cut
unless the tree is lying on perfectly flat ground or supported
asshown.
If you make the cut with the tree on the ground, don’t let the
saw’s chain dig into the earth; it is harmful for the saw, and
you stand a good chance of being struck by flying debris.To
cutthe trunk,use thebucking and two-cutsequence shown.
The first cut should be no deeper than one-third the trunk
diameter.
WARNING DANGER
KICKBACK IS DANGEROUS
Kickback is generated when the rotation of the chain is
arrestedfor somereason. The mostdangerous effect of
this action occurs when the nose of the bar contacts
anotherobject, the chain is momentarilystopped and all
theenergyoftheenginethrowsthebarupwardsandback-
wardstowardsthe operator.
The chain saw industry and government agencies have
attempted to prescribe various safety devices, but the
best protection is to avoid kickback.
Comply with the Safety Precautions as listed on page 2
of this manual.

16
/TNENOPMOC
METSYS
ECNANETNIAM
ERUDECORP
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MAINTENANCE AND CARE
YourECHOtrimmerisdesignedtoprovidemanyhoursoftroublefreeservice.Regularscheduledmaintenancewillhelp
your trimmer achieve that goal. If you are unsure or are not equipped with the necessary tools, you may want to take
yourunittoanECHOServiceDealerfor maintenance. To helpyoudecidewhetheryouwanttoDO-IT-YOURSELFor
have the ECHO Dealer do it, each maintenance task has been graded. If the task is not listed see your Echo dealer for
repairs.
SKILL LEVELS
Level 1= Easy to do. Most required tools come with unit.
Level 2= Moderatedifficulty. Some specialized tools maybe required.
Level 3= Experiencerequired.Specializedtoolsarerequired.ECHOrecommends
thattheunit bereturned to yourECHO dealerforservicing.
ECHO offers REPOWERTM Maintenance Kits and Parts to make your maintenance job easier. Just below each task
headingare listedthe variouspart numbersrequired forthat task. See your ECHOdealer forthese parts.
MAINTENANCE INTERVALS

17
D
E
G
F
AUTOMATIC OILER
• Thedischargevolumeoftheautomaticoilerisadjustedto3
to4cc/mm(@7000rpm)priortoshipmentfromthefactory.
• Always check oil discharge when in use.
• Turn adjusting screw (D) counter-clockwise to increase oil
volume,clockwisetodecreaseoilvolume.
OIL STRAINER
• Check periodically.
1. Do not allow dust to enter into oil tank.
2. Cloggedoilstrainerwillaffectthenormallubricating
system.
3. Pick it up through oil port.
4. Ifthestrainer (F)is dirty,remove cover(E), pullstrainer
out of oil tank, and wash it in suitable cleaning fluid.
5. Whentheinsideofthetankgetsdirty,rinsingthetankoutwith
gasoline will clean it.
FUEL STRAINER
• Check periodically.
1. Do not allow dust to enter into oil tank.
2. Clogged strainer will cause difficulty in starting engine or
abnormalitiesinengineperformance.
3. Pickupthefuelstrainer(G)throughfuelinletportwithapiece
of steel wire, or the like.
4. When the strainer is dirty, replace, or wash it in suitable
cleaningfluid.
5. When the inside of the fuel tank is dirty, rinsing the tank out
with suitable cleaning fluid will clean it.
AIR FILTER
1. Close choke (A) (Cold Start Position [ ]). This prevents
dirtfrom enteringthe carburetor throat when theair filteris
removed.Brushaccumulateddirtfromaircleanerarea.
2.Removeairfiltercover(B).Brushdirtfrominsidecover.
3.Removeairfilter (C)andlightlybrush debris fromfilter.
Replace filter if it is damaged, fuel soaked, very dirty, or
therubbersealingedgesaredeformed.
4. If filter can be reused, be certain it:
• Fits tightly in the air filter cavity.
• Is installed with the original side out.
5.Installair filtercover.

18
Worn : 0.5 mm
J
I
H
GUIDE BAR AND OIL HOLES
• Followinstructions for “GuideBar andSaw Chain–
Install/Remove
• Cleanaftereachuse
- Cleanthegrooves(H)oftheguidebarwithasmall
screwdriver.
- Clean oil holes (I) with a wire.
• Reverseguidebarperiodically.
SPROCKET
• Adamagedsprocket(J)willcauseprematuredamage
orwear ofsaw chain.
- Whenthe sprockethas wornout 0.5mm(.020”) or
more, replace it.
• Checksprocketwhenyouinstallnewchain.Replaceit
ifworn.
• Clean sprocket, clutch, and bar mount area before
installationofbar.
IMPORTANT
Some tree sap and resins are corrosive. Thoroughly
washtheguidebarandsprocketareasaftereachuse,
then coat metal parts with light oil.
SPARK PLUG
• Checkperiodically
• Gap = 0.65mm (.026 in.)
• Replace if either electrode is worn, or if the insulator
is fouled by oil or other deposits.
• Torque = 150 – 170 kg*cm (130 – 150 in. lb.)
IMPORTANT
Donotover-torque.

19
COOLING SYSTEM CLEANING
• Removesparkpluglead.
• Removetwo(2)mufflercoverscrewsandmuffler
cover(A).
• Removefour(4)recoilstarterhousingscrewsand
starterhousing(B).
• Use a stiff bristle cleaning brush (do not us a metal
brush)toremovedirtfromcylinderfinsinmufflerand
ignition coil areas.
B
A
MUFFLER SPARK ARRESTOR
IMPORTANT
Carbondeposits in muffler will cause a drop in
engineoutputandoverheating. Sparkarrestor
screen must be checked periodically.
1. Removemufflercoverscrewsandremovemuffler
cover.
2. Removesparkarrestorscreencover,gaskets,and
screenfrommufflerbody.
3. Cleancarbondepositsfrommufflercomponents
NOTE
Whencleaning carbon deposit, becareful not to
damagethe catalytic elementinside muffler.
4. Replace screen if it is cracked, plugged, or has
holesburnedthrough.
5. Assemblecomponentsinreverseorder.
CylinderExhaustPort
IMPORTANT
The cylinder exhaust port must be inspected and
cleanedof excess carbon every 3 months or 90 hours
of operation in order to maintain this engine within the
emissionsdurabilityperiod. ECHO stronglyrecom-
mends that you return your unit to your ECHO dealer
forthisimportantmaintenanceservice.
CS-305
CS-306

20
B
A
CARBURETORADJUSTMENT
Engine Break-In
Newenginesmustbeoperatedaminimumduration
oftwotanksoffuelbreak-inbeforecarburetoradjust-
mentscanbe made.During thebreak-inperiod your
engineperformancewillincreaseandexhaust
emissions will stabilize. Idle speed can be adjusted
asrequired.
BEFOREMAKINGADJUSTMENTS:
• Thecorrect spark plug mustbe clean and properly
gapped.
• Theair filterelement must be clean andproperly
installed.
• Themufflersparkarrestorscreenandexhaustport
must be clear of carbon.
• Thestandardbarandchaincombination(see
page 4) must be installed to the power head, and
properlytensioned.
LOWALTITUDEADJUSTMENT
Enginesthathave been adjustedtooperate athigh
altitudesmust be readjusted tooperate properly at
altitudesbelow2000feet.
1. Startengineandrunforseveralminutestoreachoperat-
ingtemperature.
2. Stopengine.Removegrommetcover(A)over“H”and“L”
limiterneedles.
3. Startengineandturnthehigh-speedneedle rich(CCW)
untiltheengineruns between 12,000and12,500RPM.
Thenturnthelow-speedneedlerich(CCW)untilthe
enginedoesnothesitate whenaccelerated.
DONOTREMOVELIMITERCAPS!
4. IdleSpeedAdjustment.
• Start engine and turn “idle” speed adjustment screw (B)
CW until the saw chain begins to move, then turn the
screwCCW until saw chain stopsmoving. Turn screw
CCWan additional 1/4turn.
5. Accelerate to full throttle for 2-3 seconds to clear excess
fuelfrom engine then returnto idle. Accelerate tofull
throttle to check for smooth transition from idle to full
throttle. If engine stops or stalls after full warm up return
theunit to yourauthorized ECHOdealer foradjustment.
6.Installgrommetcover(A)over“H”and“L”limiter needles.
HIGHALTITUDEADJUSTMENT
Highaltitudeadjustmentmayberequiredforproperoperation
ofthisengineabove2000feet.
1. Startengineandrunforseveralminutestoreachoperat-
ingtemperature.
2. Stopengine.Removegrommetcover(A)over“H”and“L”
limiterneedles.
3. Start engine and turn theHI speed needle lean(CW) until
theenginerunsbetween12,000and12,500RPM.Then
turn the LO speed needle lean (CW) until the engine does
nothesitatewhenaccelerated.
DONOTREMOVELIMITERCAPS!
4. IdleSpeedAdjustment.
• Start engine and turn “idle” speed adjustment screw (B)
CW until the saw chain begins to move, then turn the
screwCCW until saw chain stopsmoving. Turn screw
CCWan additional 1/4turn.
5. Accelerate to full throttle for 2-3 seconds to clear excess
fuelfrom engine then returnto idle. Accelerate tofull
throttle to check for smooth transition from idle to full
throttle. If engine stops or stalls after full warm up return
theunit to yourauthorized ECHOdealer foradjustment.
6.Installgrommetcover(A)over“H”and“L”limiter needles.