Chain Saw
InstructionManual
MODELS : CS-305
CS-306
WARNING
DANGER
Readrulesforsafeoperationandinstructionscarefully.ECHOprovidesanInstruction
ManualandaSafety Manual.Bothmustbereadandunderstoodforproperandsafe
operation.
X750008780
12/05
X7503205500
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7. Keep all parts of your body away from the saw
chain when the engine is running.
14.Keep the handles dry, clean, and free of oil or
fuel mixture.
8. Before you start the engine, make sure that
the saw chain is not contacting anything.
15.Operate the chain saw only in well-ventilated
areas.
9. Carry the chain saw with the engine stopped,
the guide bar and saw chain to the rear, and
the muffler away from your body.
16.Do not operate a chain saw in a tree unless
you have been specifically trained to do so.
17. All chain saw service, other than the items listed
in the Instruction Manual maintenance instruc-
tions, should be performed by competent chain
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-
wheel in order to remove the clutch, structural
damage to the flywheel could occur and could
subsequently cause the flywheel to burst.)
10.Do not operate a chain saw that is damaged,
improperly adjusted, or not completely and
securely assembled. Be sure that the saw
chain stops moving when the throttle control
trigger is released.
11. Shut off the engine before setting the chain saw
down.
12.Use extreme caution when cutting small size
brush and saplings because slender material
may catch the saw chain and be whipped to-
ward you or pull you off balance.
18.When transporting your chain saw, use the
appropriate guide bar scabbard.
19.Spark arrestor mufflers approved to SAE Stan-
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
defective muffler. Do not remove the spark ar-
restor screen.
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.
WARNING
DANGER
• Duringoperation,themufflerorcatalyticmufflerandsurroundingcoverbecomehot.
• Neversuspendthesawonalanyardwiththeenginerunning.
• Always use the saw from the right-hand side of your body – NEVER from the left side.
• Always wear proper safety clothing to protect your lower body from sharp saw chain and hot
muffler.
• Always keep exhaust area clear of flammable debris during transportation or when storing,
otherwiseseriouspropertydamageorpersonalinjurymayresult.
WARNING
DANGER
Using improper replacement components or removing safety devices may result in serious or fatal injury.
3
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CONTENTS
Page
Rules for Safe Operation .................................................................................................. 2
Technical Data ................................................................................................................. 5
Emission Data ................................................................................................................. 6
Description ...................................................................................................................... 6
Nomenclature of Parts...................................................................................................... 7
Preparation for Use.......................................................................................................... 8
Fuel and Lubricant............................................................................................................ 9
Operation....................................................................................................................... 11
Cutting Instructions ......................................................................................................... 13
Maintenance and Care ................................................................................................... 16
Chain and Guide Bar Combinations ............................................................................... 21
Troubleshooting.............................................................................................................. 23
Storage .......................................................................................................................... 24
Correct Use of Chain Brake ........................................................................................... 26
Servicing Information...................................................................................................... 28
4
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TECHNICAL DATA
CS-305
CS-306
Model
mm
inch
kg
380 x 235 x 220
14.9 x 9.2 x 8.7
3.4 (7.5 lb)
Dimension
Weight
L x W x H
Power head, dry
Without chain and guide bar
Engine
Type
Air-cooled, two-stroke, single cylinder
30.1 (1.83 cu.in.)
Displacement
Carburetor
ml
Diaphragm type
Magneto
Spark Plug
Starter
Flywheel magneto : CDI system
NGK BPM-8Y
Recoil starter
Power transmission
Automatic centrifugal clutch
Fuel
Oil
Mixture ratio
50:1 ratio with Echo Power Blend TM 2-stroke oil.
89 octane unleaded. Do not use fuel containing methyl alcohol, more
than 10% ethyl alcohol or 15% MTBE.
Tank Capacity
Bar and chain
Tank Capacity
Lubrication
ml
ml
270 (9.3 fl oz U.S.)
ECHO bar and chain oil (or motor oil)
150 (5 fl. oz. U.S.)
Adjustable automatic oil pump
14 in.
Guide bar
Saw chain
Standard
Optional
12 in.
Standard
features
Conventional handle
Rear hand guard
Front hand guard,
Anti-vibration device,
Throttle control lockout,
Chain catcher,
Spark arrestor catalytic muffler
Idle
Wide Open Throttle (WOT)
2700 - 3300
Engine RPM
12000 - 12500
Double Guard Low Kick Guide Bar
Low Kick Guard Link Saw Chain
Front Hand Guard/Chain Brake Lever
Chain Brake
Kickback
Safety
Features
Kick Guard
* Technical data subject to change without notice.
5
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EMISSION DATA
EMISSION CONTROL
EPA Phase 2/California Tier 2
The emission control system for these engines are EM (Engine Modification and Catalyst).
IMPORTANTENGINEINFORMATION
ENGINE FAMILY: 6EHXS.0334RA DISPLACEMENT: 30.1 CC
EMISSION COMPLIANCE PERIOD: 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.
An Emission Control Label is located on the engine. (These are EXAMPLES ONLY, information on label
variesbyengineFAMILY).
PRODUCT EMISSION DURABILITY
The 300 hour emission durability compliance period is the time span selected by the manufacturer certifying
the engine emissions output meets applicable emissions regulations, provided that approved maintenance
procedures are followed as listed in the Maintenance Section of this manual.
DESCRIPTION
The ECHO product you purchased has been factory pre-assembled for your convenience. Due to packaging
restrictions, guide bar and saw chain installation and other assembly may be necessary.
After opening the carton, check for damage. Immediately notify your retailer or ECHO Dealer of damaged or
missing parts. Use the contents list to check for missing parts.
CONTENTS
1 - PowerHead
1 - GuideBar
1 - Kick Guard
1 - Hex Head Bolt
1 - Hex Nut
1 - SawChain
1 - InstructionManual
1 - SafetyManual
1 - WarrantyRegistrationCard
1 - Limited Warranty Statement
1 - T-Wrench
6
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NOMENCLATURE OF PARTS
CS-305, 306
1
2
13
3
10
9
4
11
6
5
7
8
20
12
18
13
Read and follow all safety precautions in the
Instruction manual. Failure to follow instruc-
14
tions could result in serious personal injury.
CHAIN SAW 87G1
IN ACCORDANCE WITH
AMERICAN NATIONAL
STANDARD SAFETY
REQUIREMENTS FOR
GASOLINE POWERED CHAIN SAWS
(ANSI B175.1-2000)
19
P/N 89016006361
P/N 89019130131
17
TO AVOID 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.
16
P/N X524000791
GUIDE BAR*
CHAIN*
REPLACEMENT BARANDCHAIN
Note:There may be other replacement
components for achieving
P/N 89022839131
ADVERTENCIA
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
PART NO.
12” 120374501
14” 140375201
TYPE
LINKS
45
OREGON 91VG
OREGON 91VG
52
kickback protection. For details,
please refer to the chain and bar
combination sheet shown in the
instruction manual.
PELIGRO
ayudantes y los espectadores deben leer y comprender el Manual Del
Operador y los Manuales De Seguridad que se entregan escritos en
español.
* If a decal cannot be read,
a new one can be ordered
fromyourECHOdealer.
1. Fronthandle
2. Handguard
14. Throttle control latch
15. On / Off switch
16. Oil tank cap
17. Fuel tank cap
18. Purgebulb
7. Muffler
8. Rearhandguard
9. Throttlecontrollockout
10. Throttlecontroltrigger
11. Aircleanercover
(Chainbrakeactuatinglever)
3. Saw chain
4. Guidebar
5. Chaincatcher
6. Sprocketguard
19. Kick guard
12. Chain tension adjustment screw
20. Spark Plug
13. Pull starter
7
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PREPARATION FOR USE
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
through front hole (C) in guide bar.
2. IMPORTANT: Dimple in Kick Guard® (D) must
engage recess in guide bar (E).
3. Tighten nut (F) and bolt (A) until snug. Make certain
Kick Guard® is flush against guide bar.
GUIDE BAR AND SAW CHAIN-INSTALL/
REMOVE
WARNING
DANGER
Saw Chain is sharp! Always wear gloves when
handling assembly, otherwise serious personal injury
may result.
G
1. Move chain brake lever fully rearward to release
chain brake.
IMPORTANT
K
H
Always loosen guide bar nuts before turning chain
tension adjuster, otherwise clutch cover and tensioner
will be damaged.
J
2. Remove two guide bar nuts (I) and remove sprocket
guard (J).
3. Remove guide bar and saw chain if necessary.
NOTE: See “MAINTENANCEAND CARE”
instructions for guide bar, sprocket, and saw chain
maintenance.
I
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
guide bar facing forward.
7. Turn saw over and check brake band for correct
position around clutch drum. If brake band is not
in place around drum, remove clutch cover, make
sure brake is released, and reinstall.
IMPORTANT
Be certain tensioner fits into lower adjuster hole (K)
beforetighteningguidebarnuts.
DANGER
Never operate saw if chain brake does not
NOTE
function properly, otherwise saw damage
and serious personal injury could result.
See “Testing the Brake” instructions.
Move chain brake lever fully rearward to install
sprocket guard to saw.
6. Install sprocket guard (J), and tighten guide bar nuts
(I) finger tight.
•
Adjust saw chain tension, as instructed in “Adjust-
ment, Chain Tension.”
8
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ADJUSTMENT, CHAIN TENSION
IMPORTANT
Always loosen guide bar nuts before turning chain
tension adjuster, otherwise clutch cover and tensioner
will be damaged.
1. Remove spark plug 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.
L
4. Tighten both guide bar nuts with bar nose held up.
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
All chains require frequent adjustments.
FUEL AND LUBRICANT
NOTICE: Use of unmixed, improperly mixed, or fuel older
than 90 days, (stale fuel), may cause hard starting, poor
performance,orsevereenginedamageandvoidtheproduct
warranty. Read and follow instructions in the Storage section
of this manual.
Two Stroke Oil - A two-stroke engine oil
meetingISO-L-EGD(ISO/CD13738)and
J.A.S.O. FC Standards must be used. Echo
brand premium Power BlendTM Universal 2-
Stroke Oil meets these standards. Engine
problems due to inadequate lubrication caused
by failure to use an ISO-L-EGD and J.A.S.O. FC
certified oil, such as Echo premium Power
BlendTM, will void the two-stroke engine warranty.
(Emission related parts only are covered for two
years, regardless of two-stroke oil used, per the
statement listed in the Emission Defect Warranty
Explanation.)
FUEL STATEMENT
GASOLINE - Use 89 Octane [R+M/2] (mid grade or higher)
gasoline or gasohol known to be good quality. Gasohol may
contain up to 10% Ethyl (grain) alcohol or 15% MTBE (methyl
tertiary-butyl ether). Gasohol containing methyl (wood) alcohol
isNOTapproved.
9
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Fuel Mix Chart
50:1
IMPORTANT
Echo premium Power BlendTM Universal 2-Stroke Oil may be
mixed at 50:1 ratio for application in all Echo engines sold in
the past regardless of ratio specified in those manuals.
(U.S.)
(METRIC)
GAS
GAS
Gal.
OIL
OIL
cc.
Handling Fuel
Fl. oz.
Liter
1
2
5
2.6
5.1
12.8
4
8
20
80
160
400
WARNING
DANGER
Fuel is VERY flammable. Use extreme care when mixing,
storing or handling or serious personal injury may result.
• Useanapprovedfuelcontainer.
IMPORTANT
• DO NOT smoke near fuel.
Spilled fuel is a leading cause of hydrocar-
bon emissions. Some states may require
the use of automatic fuel shut-off containers
to reduce fuel spillage.
• DO NOT allow flames or sparks near fuel.
• Fuel tanks/cans may be under pressure. Always loosen fuel
caps slowly allowing pressure to equalize.
• NEVER refuel a unit when the engine is HOT or RUNNING!
• DO NOT fill fuel tanks indoors. ALWAYS fill fuel tanks
outdoorsoverbareground.
After use
• 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
or operate unit until leakage is repaired.
• DO NOT store a unit with fuel in its tank. Leaks
can occur. Return unused fuel to an approved
fuelstoragecontainer.
• Move at least 3m (10 ft.) from refueling location before
starting the engine.
Storage - Fuel storage laws vary by locality.
Contact your local government for the laws
affecting your area. As a precaution, store fuel in
an approved, airtight container. Store in a well-
ventilated, unoccupiedbuilding, awayfromsparks
and flames.
MixingInstructions
1. Fill an approved fuel container with half of the required amount
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
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
Stored two-stroke fuel may separate.
ALWAYS shake fuel container thoroughly
beforeeachuse.
CHAIN LUBRICANT
Proper lubrication of the chain while in operation reduces friction
between the chain and the guide bar to a minimum and assures
a longer service life.
TANK INDICATION
• use bar and chain oil of high quality for this purpose.
• Do not use used or reclaimed oil to avoid various oiler
problems.
• Use ECHO bar and chain oil.
• When ECHO bar and chain oil is not available:
Use motor oil, etc.
FUEL TANK
OILTANK
• Use bar and chain oil of the following grades:
SAE NO. 30 ..... in summer
SAE NO. 10 ..... in winter or when cutting resinous trees.
• When refueling, also refill chain oil.
10
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OPERATION
WHEN THE ENGINE IS COLD
WARNING
DANGER
Make sure bar and chain are not touching anything when
starting the saw.
1. Move chain brake lever fully forward to engage chain brake
before starting.
2. Fill the fuel tank with fuel. Do not over fill.
3. Fill the chain oil tank with lubricant. Do not over fill.
4. Turn switch (A) to “RUN” position (I).
A
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. Pull starter handle again.
C
NOTE
If engine does not start after 5 pulls, repeat instructions.
WHEN ENGINE IS HARD TO START
WARNING
DANGER
B
Clutchengagesandchainmayrotatewhenengineisstarted
with throttle control latch engaged. Never use the throttle
control latch for cutting. Use only when starting the engine.
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. Pull starter 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.
Securely hold the saw.
Do not allow recoil handle to snap back against the
casing.
11
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STARTING WARM ENGINE
1. Ensure that there is fuel and chain oil in the tanks. (If fuel
tank was emptied during previous operation, refill tank and
push purge bulb 10 times.)
2. Movechainbrakeleverfullyforwardtoengagechainbrake
beforestarting.
3. Turn switch (A) to “RUN” position (I).
4. Pull starter 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.
A
RUNNING
WARNING
DANGER
The saw chain should not move at idle, otherwise serious
personal injury may result.
NOTE
If saw chain moves adjust carburetor according to “Carbure-
tor Adjustment” instructions in this manual, or see your
dealer.
•
•
•
After engine starts, allow it to return to idle.
Move chain brake lever fully rearward to release chain brake.
Press throttle control lockout then gradually squeeze
throttle trigger to increase engine speed.
•
Saw chain starts moving when the engine reaches approxi-
mately 4200 rpm.
•
•
•
Ensure proper acceleration and lubrication of chain and 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
and repair stop switch before starting the engine again.
A
12
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CUTTING INSTRUCTIONS
WARNING
GENERAL
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
fatal injuries.
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
you have learned the basic techniques of using the 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
saw with your left hand on the front handlebar and your right
hand on the rear handle so you can operate the throttle trigger
with your right index finger.
Before attempting to fell a tree, cut some small logs or limbs.
Become thoroughly familiar with the controls and the 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
chain is properly sharpened, the cutting should 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
Some material may adversely affect the housings of your
ECHO chain saw.
Kickback
(Example: Palm TreeAcid, fertilizer, etc.) To avoid housing
deterioration, carefully remove all packed saw dust around
clutch and guide bar area and wash with water.
WARNING
DANGER
Do not let the tip of the bar touch anything while the engine is
running.At cutting speed the chain is moving at a high rate of
speed. Should the tip contact a limb or log while the chain is
moving, the tip will be pushed upward with considerable force.
This is known as kickback. Avoid it!
13
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FELLING A TREE
WARNING
DANGER
DIRECTION
OFFALL
A falling tree can cause serious injury or damage any-
thing it may hit - a car, a house, a fence, a power line, or
another tree. There are ways to make a tree fall where
you want it, so first decide where that is!
Before cutting, clear the area around the tree. You will need
good footing while working and you should be able to work
the saw without hitting any obstacles. Next, select a path
of retreat. When the tree begins to fall you should retreat
away from the direction of fall at a 45 degree angle to avoid
the trunk kicking back over the stump.
45°
Direction of fall
First cut
Hinge
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
opposite the notch and at a level about 2” above the bottom
of the notch. Do not try to cut through to the notch with the
felling cut. The remaining wood between the notch cut 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 the saw on the ground and make
your retreat quickly.
2”
Felling cut
2”
Notch
Second cut
One-third tree
diameter
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
cut on one side of the tree, pivoting the saw through to form
the desired hinge on that side.
Then remove the saw for the second cut. Insert the saw in
the first cut, very carefully so as not to cause kickback.
The final cut is made by drawing the saw forward in the cut
to reach the hinge.
LIMBING
Limbing a fallen tree is much the same as bucking. Never
limb on the tree that you are standing. When limbing, cau-
tion is the word. Be careful of the tip touching other limbs.
Always use both hands.
14
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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
enough control to prevent possible injury.
Bucking is the sawing of a log or fallen tree into smaller
pieces. There are a few basic rules which apply to all
bucking operations.
Keep both hands on the handles at all times.
Support logs if possible.
Uphill position
When cutting on a slope or hillside, always stand uphill.
BUCKING
Keep in mind that the wood is heavy and that it will bend and
pinch the 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
as shown.
FINISH CUT
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
cut the trunk, use the bucking and two-cut sequence shown.
The first cut should be no deeper than one-third the trunk
diameter.
FIRST CUT
Board or flat stones
KICKBACK
WARNING
DANGER
KICKBACK IS DANGEROUS
Kickback is generated when the rotation of the chain is
arrested for some reason. The most dangerous effect of
this action occurs when the nose of the bar contacts
another object, the chain is momentarily stopped and all
the energy of the engine throws the bar upwards and back-
wards towards the operator.
•
Improper thrust cutting.
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.
•
When the bar nose hits another tree, etc.
15
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MAINTENANCE AND CARE
Your ECHO trimmer is designed to provide many hours of trouble free service. Regular scheduled maintenance will help
your trimmer achieve that goal. If you are unsure or are not equipped with the necessary tools, you may want to take
your unit to an ECHO Service Dealer for maintenance. To help you decide whether you want to DO-IT-YOURSELF or
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 = Moderate difficulty. Some specialized tools may be required.
Level 3 = Experiencerequired. Specializedtoolsarerequired. ECHOrecommends
that the unit be returned to your ECHO dealer for servicing.
ECHO offers REPOWERTM Maintenance Kits and Parts to make your maintenance job easier. Just below each task
heading are listed the various part numbers required for that task. See your ECHO dealer for these parts.
MAINTENANCE INTERVALS
3
6
REQ'D
SKILL
LEVEL
DAILY OR
BEFORE
USE
YEARLY
600
HOURS
COMPONENT/
SYSTEM
MAINTENANCE
PROCEDURE
EVERY
REFUEL
MONTHS
OR 90
HOURS
MONTHS
OR 270
HOURS
Recommended Echo Dealer Maintenance Procedures
Inspect/Clean/Decarbon
Do-It-Yourself Maintenance Procedures
Cylinder Exhaust Port
3
I / C
R *
Air Filter
Inspect/Clean/Replace
Inspect/Adjust
1
1
1
1
1
2
2
2
2
1
1
I / C
I
Automatic Oiler
Oil Strainer
Inspect/Replace
I / R *
Fuel Strainer
Inspect/Replace
I
R *
Guide Bar & Oil Holes
Sprocket
Inspect/Clean
I / C
Inspect/Replace
I / R *
Spark Plug
Inspect/Clean/Replace
Inspect/Clean
I / C
R *
Cooling System
Muffler Spark Arrestor
Recoil Starter Rope
Screws/Nuts/Bolts
I / C
Inspect/Clean/Replace
Inspect/Replace
I / R *
I / R *
I / R *
Inspect/Tighten/Replace
MAINTENANCE PROCEDURE LETTER CODES: I = INSPECT, R = REPLACE, C = CLEAN
IMPORTANT NOTE - Time intervals shown are maximum. Actual use and your experience will determine the frequency of required
maintenance.
MAINTENANCE PROCEDURE NOTES:
* All recommendations to replace are based on the finding of damage or wear during inspection..
16
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AIR FILTER
1. Close choke (A) (Cold Start Position [
]). This prevents
dirt from entering the carburetor throat when the air filter is
removed. Brush accumulated dirt from air cleaner area.
2. Remove air filter cover (B). Brush dirt from inside cover.
3. Remove air filter (C) and lightly brush debris from filter.
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. Install air filter cover.
AUTOMATIC OILER
•
The discharge volume of the automatic oiler is adjusted to 3
to4cc/mm(@7000rpm)priortoshipmentfromthefactory.
Always check oil discharge when in use.
Turn adjusting screw (D) counter-clockwise to increase oil
volume, clockwise to decrease oil volume.
•
•
D
E
OIL STRAINER
• Check periodically.
1. Do not allow dust to enter into oil tank.
2. Clogged oil strainer will affect the normal lubricating
system.
3. Pick it up through oil port.
4. If the strainer (F) is dirty, remove cover (E), pull strainer
out of oil tank, and wash it in suitable cleaning fluid.
5. Whentheinsideofthetankgetsdirty,rinsingthetankoutwith
gasoline will clean it.
F
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.
G
5. When the inside of the fuel tank is dirty, rinsing the tank out
with suitable cleaning fluid will clean it.
17
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GUIDE BAR AND OIL HOLES
• Follow instructions for “Guide Bar and Saw Chain –
Install/Remove
H
•
Clean after each use
-
Clean the grooves (H) of the guide bar with a small
screwdriver.
-
Clean oil holes (I) with a wire.
•
Reverseguidebarperiodically.
I
SPROCKET
•
A damaged sprocket (J) will cause premature damage
or wear of saw chain.
-
When the sprocket has worn out 0.5mm (.020”) or
more, replace it.
Worn : 0.5 mm
•
•
Check sprocket when you install new chain. Replace it
ifworn.
Clean sprocket, clutch, and bar mount area before
installation of bar.
J
IMPORTANT
Some tree sap and resins are corrosive. Thoroughly
wash the guide bar and sprocket areas after each use,
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.
18
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COOLING SYSTEM CLEANING
•
•
Removesparkpluglead.
Removetwo(2)mufflercoverscrewsandmuffler
cover(A).
A
•
•
Remove four (4) recoil starter housing screws and
starter housing (B).
Use a stiff bristle cleaning brush (do not us a metal
brush) to remove dirt from cylinder fins in muffler and
ignition coil areas.
B
MUFFLER SPARK ARRESTOR
IMPORTANT
Carbon deposits in muffler will cause a drop in
engineoutputandoverheating. Sparkarrestor
screen must be checked periodically.
CS-305
1. Removemufflercoverscrewsandremovemuffler
cover.
2. Remove spark arrestor screen cover, gaskets, and
screenfrommufflerbody.
3. Cleancarbondepositsfrommufflercomponents
NOTE
When cleaning carbon deposit, be careful not to
damage the catalytic element inside muffler.
4. Replace screen if it is cracked, plugged, or has
holesburnedthrough.
5. Assemblecomponentsinreverseorder.
CS-306
Cylinder Exhaust Port
IMPORTANT
The cylinder exhaust port must be inspected and
cleaned of excess carbon every 3 months or 90 hours
of operation in order to maintain this engine within the
emissions durability period. ECHO strongly recom-
mends that you return your unit to your ECHO dealer
forthisimportantmaintenanceservice.
19
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CARBURETOR ADJUSTMENT
Engine Break-In
1. Start engine and run for several minutes to reach operat-
ingtemperature.
New engines must be operated a minimum duration
of two tanks of fuel break-in before carburetor adjust-
ments can be made. During the break-in period your
engineperformancewillincreaseandexhaust
emissions will stabilize. Idle speed can be adjusted
asrequired.
2. Stopengine.Removegrommetcover(A)over“H”and“L”
limiterneedles.
3. Start engine and turn the high-speed needle rich (CCW)
until the engine runs between 12,000 and 12,500 RPM.
Then turn the low-speed needle rich (CCW) until the
engine does not hesitate when accelerated.
BEFOREMAKINGADJUSTMENTS:
•
•
•
•
The correct spark plug must be clean and properly
gapped.
The air filter element must be clean and properly
installed.
The muffler spark arrestor screen and exhaust port
must be clear of carbon.
The standard bar and chain combination (see
page 4) must be installed to the power head, and
properlytensioned.
DO NOT REMOVE LIMITER CAPS!
4. Idle Speed Adjustment.
• Start engine and turn “idle” speed adjustment screw (B)
CW until the saw chain begins to move, then turn the
screw CCW until saw chain stops moving. Turn screw
CCW an additional 1/4 turn.
5. Accelerate to full throttle for 2-3 seconds to clear excess
fuel from engine then return to idle. Accelerate to full
throttle to check for smooth transition from idle to full
throttle. If engine stops or stalls after full warm up return
the unit to your authorized ECHO dealer for adjustment.
LOWALTITUDEADJUSTMENT
Engines that have been adjusted to operate at high
altitudes must be readjusted to operate properly at
altitudes below 2000 feet.
6. Install grommet cover (A) over “H” and “L” limiter needles.
HIGHALTITUDEADJUSTMENT
Highaltitudeadjustmentmayberequiredforproperoperation
of this engine above 2000 feet.
A
1. Start engine and run for several minutes to reach operat-
ingtemperature.
2. Stopengine.Removegrommetcover(A)over“H”and“L”
limiterneedles.
B
3. Start engine and turn the HI speed needle lean (CW) until
the engine runs between 12,000 and 12,500 RPM. Then
turn the LO speed needle lean (CW) until the engine does
not hesitate when accelerated.
DO NOT REMOVE LIMITER CAPS!
4. Idle Speed Adjustment.
• Start engine and turn “idle” speed adjustment screw (B)
CW until the saw chain begins to move, then turn the
screw CCW until saw chain stops moving. Turn screw
CCW an additional 1/4 turn.
5. Accelerate to full throttle for 2-3 seconds to clear excess
fuel from engine then return to idle. Accelerate to full
throttle to check for smooth transition from idle to full
throttle. If engine stops or stalls after full warm up return
the unit to your authorized ECHO dealer for adjustment.
6. Install grommet cover (A) over “H” and “L” limiter needles.
20
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CHAIN AND GUIDE BAR COMBINATIONS
The following combinations may be used on CS-305 and CS-306.
DOUBLE
SAW CHAIN
GUARD BAR
KICK
GUARD
BAR
MODEL
LENGTH
ECHO P/N
(OEM P/N)
ECHO
PART NO.
ECHO
PART NO.
LINKS
45
TYPE
PITCH
3/8"
GAUGE
.043
90SG-45
1907045
12"
14"
12A4CD3745
14A4CD3752
CS-305
CS-306
2894901
28949
90SG
90SG-52
1907052
52
*Reduced nose radius symmetrical bars (OREGON name — Double Guard)
WARNING
DANGER
Useofreplacementsawchainand/orguidebarotherthanthatspecified,oroperationwithoutthe“tipguard”inplace,may
cause severe kickback resulting in serious injury.
Onlyusesawchaindesignatedas,“LOW-KICKBACK,”thatmeetstheANSIB175.1-2000Standard,andtheEchoguide
barspecified.
IMPORTANT
Chain and guide bar gauge size must be identical. Use Bar/Chain combinations shown in table
above.
IMPORTANT
If your kick guard is damaged or lost, contact your Echo dealer for a replacement. For the
usa.com.
Refer to your Chain Saw Safety Manual for kick guard application information.
21
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SETTING THE SAW CHAIN
For setting saw chains, round file 4.5 mm (11/64”) and flat file are used.
•
To keep correct position and correct angle, use the file holder.
- Round file and flat file are available from your Echo Dealer.
•
File cutters as below.
To sharpen other type chain, follow chain manufacturer’s instructions
Type : 90SG
Depth
gauge
1/5
30°
Keep this angle
90°
ONEFIFTHOFFILEDIAMETER
REMAINS ABOVE CUTTER EDGE
HOLDFILEHOLDER
LEVEL
PUSH FILE AS SHOWN
•
Place the depth gauge tool firmly on guide bar so that depth gauge protrudes. Then file top of depth gauge with flat file
until flat with top of the gauge tool.
- Be sure to round off the front edge of the depth gauge.
Depth gauge
tool
Round
off the
edge
Remove
until flat
with tool
•
Properly filed cutters are shown below.
(Top plate angle)
(Side plate angle)
(Top plate cutting angle)
(Depth gauge)
0.64 mm (0.025 in.)
50°
75°
Parallel
30°
•
•
When setting of the chain is finished, soak it in oil and wash away filings completely before using.
When chain has been filed on the bar, supply sufficient oil to it, rotate the chain slowly to wash away the filings before
using again.
•
•
If the chain saw is operated with filings clogged in the groove, the saw chain and the guide bar will be damaged
prematurely
If the saw chain becomes soiled with resin, for instance, clean it with kerosene and soak it in oil.
(SPROCKET)
CHAIN TYPE AND SPROCKET PITCH
Saw chain should be used with corresponding pitched
sprocket. To identify chain type and pitch of sprocket,
check as follows.
(DRIVE LINK)
90S
Number
indicates
Number
indicates Chain
type
•
•
Chain type number (A) is stamped on drive link.
Sprocket pitch (B) is stamped on clutch drum.
Chain type
90
A
B
22
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TROUBLESHOOTING
Poor performance of the engine and/or cutting mechanism can normally be prevented by carefully following these
instructions.
Poor performance can easily be corrected even by a beginner.
When the engine does not function properly check the following three (3) points first.
•
•
•
Is the engine compression adequate?
Is fuel system in good condition and is enough fuel being supplied?
Is electrical system in good condition and is spark plug operating normally?
When there is serious trouble with the unit, do not try to repair it yourself but have your distributor or dealer do it for you.
For detailed TROUBLESHOOTING refer to tables 1 and 2. Locate the problem on the following charts and repair as
necessary.
Fuel is not
Fuel strainer clogged ................................... Clean.
reaching carburetor
Table 1
Fuel pipe clogged ........................................ Clean.
Suction insufficient ....................................... Make sufficient.
Fuel is not reaching
cylinder
Strainer clogged .......................................... Clean.
Carburetor out of order ................................. Disassemble and check.
C.D.I. module defective ................................. Remove and replace.
Ignition coil defective .................................... Remove and replace.
Wire connection defective ............................. Reconnect.
No spark at high tension
cord end.
High-tension cord connection defective ......... Repair as necessary.
Switch is grounded ....................................... Switch on.
Insulator cracked .......................................... Replace plug.
Spark gap incorrect ...................................... Adjust.
No spark at plug
Covered with carbon ..................................... Clean or replace.
Fouled with fuel ............................................ Clean or replace.
Starting procedures incorrect ....................... Start correctly.
Low and high speed needle ........................... Readjust.
setting too lean
Metering lever spring too strong .................. Readjust.
Fuel does not
keep running
Fuel pump diaphragm defective ..................... Replace.
Fuel passage clogged with dust ................... Disassemble and clean.
Fuel leaking from fixing surfaces .................. Retighten all screws.
of carburetor
Acceleration
and low speed
function
Air valve, fuel tank cap does not
work normally ............................................... Replace or Clean.
defective
Fuel pump does not operate .......................... Check impulse drilling.
Carburetor
overflow
Fuel inlet needle valve clogged with dust ....... Clean.
Metering lever spring not placed
in dent of lever .............................................. Correct.
Muffler sticky with fuel ................................... Fuel mixture is too rich
Start the engine several times
with choke rod fully open and
run at fast idle until engine
does not smoke.
Bearing damaged ......................................... Disassemble and replace.
Piston and/or cylinder seized ........................ Disassemble and replace.
Crankshaft worn ........................................... Disassemble and replace.
Crankshaft contacting crankcase .................. Disassemble and replace.
Engine does
not crank
23
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Improper fuel used ........................................ Use fuel with correct mixing ratio. Never use
gasoline of poor quality.
Table 2
Spark plug defective (worn) ........................... Replace.
Engine
overheated
As cooling fins clogged, air
does not pass well ........................................ Clean fins.
Excessive deposits in
combustion chamber ..................................... Disassemble and remove carbon.
Firing function
defective
Plug damaged or fouled ................................ Replace or clean.
Comubstion poor due to
defective wiring ............................................ Check wiring.
High-speed needle setting incorrect ............. Readjust.
Carburetor
defective
Carburetor overflow ...................................... Refer to Table 1.
Air cleaner clogged ..................................... Clean as necessary.
Compression insufficient
(piston ring stuck or worn out) ...................... Disassemble, check and replace if necessary.
Cylinder chromium plating peeled ................. Replace cylinder
or worn out
Other
troubles
Exhaust port clogged with carbon ................. Clean as necessary.
Throttle is not fully open ................................ Readjust.
Chain tension incorrect ................................ Adjust.
Chain wrongly set ......................................... Set correctly.
Depth incorrect ............................................ Readjust.
Chain does not cut
clean
Chain saw pressed against
tree to firmly ................................................. Press lightly.
Chain stops
(Clutch slips)
Clutch shoe worn out .................................... Replace.
No oil in tank ................................................ Refill.
Oil delivery incorrect ..................................... Adjust.
Chain poorly
lubricated
Oil contaminated with dust ............................ Rinse tank and fill with new oil..
Oil viscosity inappropriate ............................. Use oil with correct viscosity for summer or winter.
WARNING
DANGER
Fuel vapors are extremely flammable and may cause fire and/or explosion. Never test for ignition spark by ground-
ing spark plug near cylinder plug hole, otherwise serious personal injury may result.
STORAGE AFTER USE
Inspect and adjust every part of the chain saw.
•
- Completely clean every part, and repair, if necessary.
- Apply thin coating of oil on metal parts to prevent rust.
- Remove chain and guide bar.
•
•
Drain fuel tank, pull starter slowly a few times to drain fuel from carburetor.
Pour a small amount of clean two-stroke oil into spark plug hole, pull starter and crank engine until the piston is at TOP
DEAD CENTER.
•
Store in a dry area, free from dust.
24
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CORRECT USE OF CHAIN BRAKE
The installation of a chain brake may be mandatory by law or as stipulated by insurance regulations in your area of
operation. You should inquire through local government offices, your employer or your local dealer to ensure that your
chain saw conforms to the required safety standard. Echo chain brakes have been designed and tested to comply with
international safety standards as follows.
USA:
ANSI Standard B175.1-2000 Safety Requirement for chain saws
CSA Standard Z 62.1 CHAIN SAWS
Canada:
WARNING
DANGER
ANSI Standard B175.1-2000 stipulates that the brake shall stop the chain in 0.15 seconds maximum (.12 sec avg)
at full throttle. It is the responsibility of the Owner/Operator to ensure that the brake is serviced, adjusted and tested
strictly in accordance with the instructions as detailed herein in order to ensure that the brake performance is
maintained in compliance with the Standard B175.1-2000.
Kickback Motion:
Function:
•
When the bar nose hits another tree, etc.
•
When the lever is pushed forward, chain brake instantly
works to stop the chain.
Release:
•
When the lever is fully pulled toward the operator, brake is
released.
•
Improper thrust cutting.
INSTALLATION
TESTING THE BRAKE
•
Echo recommends that the chain brake should be
serviced by an authorized Echo servicing dealer.
•
•
•
Start the engine on a solid level surface and run at a fast
idle until warm.
Hold the saw firmly by the handles and accelerate the
engine to a fast idle.
Slowly operate the chain brake lever while holding the
saw firmly on the ground. When the brake lever trips, the
chain should stop. Immediately release the throttle
trigger.
OPERATION
•
Set the lever in the released position before starting to
cut.
•
If the brake is tripped by kick back reaction, the chain will
stop. Immediately release the throttle to avoid possible
damage to the engine or clutch.
IMPORTANT
Do not allow the saw to tip forward in order to avoid
damage to the chain.
•
Do not attempt to operate the engine with the brake
engaged.
If the chain does not stop, immediately return the saw to your
authorized Echo dealer for repair.
26
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NOTES
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SERVICING INFORMATION
PARTS/SERIAL NUMBER
GenuineECHOPartsandECHOREPOWERTM PartsandAssembliesfor
your ECHO products are available only from an Authorized ECHO
Dealer. When you do need to buy parts always have the Model
Number and Serial Number of the unit with you. You can find these
numbers on the engine housing. For future reference, write them in the
space provided below.
Model No. _____________ SN. __________
SERVICE
Service of this product during the warranty period must be performed
by an Authorized ECHO Service Dealer. For the name and address of
the Authorized ECHO Service Dealer nearest you, ask your retailer or
call: 1-800-432-ECHO. When presenting your unit for Warranty
service/repairs, proof of purchase is required.
DEALER?
Call
1-800-432-ECHO
or
ECHO CONSUMER PRODUCT SUPPORT
If you require assistance or have questions concerning the application,
operation or maintenance of this product you may call the ECHO
ConsumerProductSupportDepartmentat1-800-673-1558from8:30am
to 4:30 pm (Central Standard Time) Monday through Friday. Before
calling, please know the model and serial number of your unit to help
your Consumer Product Support Representative.
CONSUMER PRODUCT
SUPPORT
1-800-673-1558
8:30 - 4:30 Mon - Fri C.S.T.
WARRANTY CARD
This card is our means of registering all original owners of ECHO
equipment. The card plus proof of purchase provides you the assur-
ance that authorized warranty work will be done. It also provides a
direct link between you and ECHO if we find it necessary to contact
you.
ADDITIONAL OR REPLACEMENT MANUALS
Safety Manuals in English/Spanish or English/French are available, free of charge, from your ECHO dealer or at
Operator'sandPartsManualsareavailableby:
• Downloadingfreefromwww.echo-usa.com
• Purchasing from your Echo Dealer.
• Manuals are available by sending a written request stating the model number and serial number of your Echo unit,
part number of the manual, your name and address, and mail to the address below.
Safety Videos are available from your Echo dealer. A $5.00 shipping charge will be required for each video.
ECHO, INCORPORATED
400OAKWOOD ROAD
LAKE ZURICH,IL 60047
03001001/03999999
02001001/02999999
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