Echo CS-306 User manual

X7503206001
Chain Saw
Instruction Manual
MODEL CS-306
WARNING
Read rules for safe operation and instructions carefully. ECHO provides an Instruc-
tion Manual and a Safety Manual. Both must be read and understood for proper and
safe operation.
X750009871
02/09

2
RULES FOR SAFE OPERATION
A. Kickback Safety Precaution for Chain Saw Users
WARNING!
KICKBACK may occur when the nose or tip of the
guide bar touches an object, or when the wood
closes in and pinches the saw chain in the cut.
Tip contact in some cases may cause a lightning
fast reverse REACTION, Kicking the guide bar up
and back towards the operator. Pinching the saw
chain along the top of the guide bar may push the
guide bar rapidly back towards the operator. Ei-
ther of these reactions may cause you to lose
control of the saw which could result in serious
personal injury.
The Kick Guard ®device is not installed on the
guide bar when you purchase your ECHO chain
saw. The Kick Guard ® can be used in a majority
of cutting operations, and is especially recom-
mended for beginners, homeowners, or chain saw
novices. Most cutting operations can be accom-
plished with the Kick Guard®in place.
Do not rely exclusively upon the safety devices
built into your saw. As a chain saw user, you should
take several steps to keep your cutting jobs free
from accident or injury.
1. With a basic understanding of kickback, you
can reduce or eliminate the element of sur-
prise. Sudden surprise contributes to acci-
dents.
2.Keep a good firm grip on the saw with both
hands, the right hand on the rear handle, and
the left hand on the front handle, when the
engine is running. Use a firm grip with thumbs
and fingers encircling the chain saw handles.
A firm grip will help you reduce kickback and
maintain control of the 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
nose of the guide bar contact a log, branch, or
any other obstruction which could be hit while
you are operating the saw.
4. Cut at high engine speeds.
5. Do not overreach or cut above shoulder height.
6. Follow manufacturer’s sharpening and main-
tenance instructions for the saw chain.
7. Only use replacement bars and chains speci-
fied by the manufacturer or the equivalent.
B. Other Safety Precautions
1. Do not operate a chain saw with one hand!
Serious injury to the operator, helpers, by-
standers, or any combination of these per-
sons may result from one-handed operation.
A chain saw is intended for two-handed use.
2. Do not operate a chain saw when you are
fatigued.
3. Use safety footwear; snug-fitting clothing; pro-
tective gloves; and eye, hearing and head pro-
tection devices. Keep long hair away from
engine and air intake. Retain hair with cap or
net.
4. Use caution when handling fuel. Move the chain
saw at least 3 m (10 feet) from the fueling
point before starting the engine.
5. Do not allow other persons to be near the chain
saw when starting or cutting with the chain
saw. Keep bystanders and animals out of the
work area.
6. Do not start cutting until you have a clear work
area, secure footing, and a planned retreat
path from the falling tree.
Copyright© 2009 By Echo, Incorporated
All Rights Reserved.

3
7. Keep all parts of your body away from the
saw chain when the engine is running.
8. Before you start the engine, make sure that
the saw chain is not contacting anything.
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.
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.
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 the handles dry, clean, and free of oil or
fuel mixture.
15.Operate the chain saw only in well-ventilated
areas.
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
instructions, should be performed by compe-
tent chain saw service personnel. (For ex-
ample, if improper tools are used to remove
the flywheel or if an improper tool is used to
hold the flywheel in order to remove the clutch,
structural damage to the flywheel could occur
and could subsequently cause the flywheel to
burst.)
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
arrestor screen.
WARNING
•During operation, the muffler or catalytic muffler and surrounding cover become hot.
•Never suspend the saw on a lanyard with the engine running.
•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,
otherwise serious property damage or personal injury may result.
WARNING
Using improper replacement components or removing safety devices may result in serious or fatal injury.
WARNING
Check fuel system for leaks due to fuel tank damage, especially if the unit is dropped. If damage or leaks are
found, do not use unit, otherwise serious personal injury or property damage may occur. Have unit repaired by an
authorized servicing dealer before using.

4
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 ........................................................................................................ 14
Maintenance and Care ................................................................................................... 17
Chain and Guide Bar Combinations ............................................................................... 22
Troubleshooting ............................................................................................................. 24
Storage .......................................................................................................................... 26
Correct Use of Chain Brake ........................................................................................... 26
Servicing Information ..................................................................................................... 28
INTERNATIONAL S YMBOLS
Carburetor adjustment
- Idle speed
Carburetor adjustment
- High speed mixture
Wear eyes, ears and head
protection
Carburetor adjustment
- Low speed mixture
Gasoline and oil mixture
Symbol form/shape Symbol description/application Symbol form/shape Symbol description/application
Chain oiler adjustmentChain brake operation
Chain oil pump
Chain oil fill
Emergency stop
Choke control “Cold Start”
position (choke closed)
STOP
Read and understand
Operator's Manual.

5
TECHNICAL D ATA
* Technical data subject to change without notice.
Model ............................................................................................ CS-306
Dimension L x W x H..................................................................... 380 x 235 x 220 mm (14.9 x 9.2 x 8.7 inch)
Weight ................................................... Power head, dry ........... 3.4 kg (7.5 lb) Without chain and guide bar
Engine ................................................... Type ............................. Air-cooled, two-stroke, single cylinder
.............................................................. Displacement ................ 30.1 (1.83 cu.in.)
.............................................................. Carburetor .................... Diaphragm type
.............................................................. Magneto ........................ Flywheel magneto : CDI system
.............................................................. Spark Plug .................... NGK BPMR-8Y
.............................................................. Starter ........................... Recoil starter
.............................................................. Power transmission ...... Automatic centrifugal clutch
Fuel ....................................................... Mixture ratio .................. 50:1 ratio with Echo Power Blend TM 2-stroke oil.
--------------------------------------------------------------- 50 : 1 Power Blend X™ ISO-L-EGD (ISO/CD 13738)
and J.A.S.O. M345- FC/FD, two-stroke, air-cooled
engine oil.
.............................................................. Tank Capacity ............... 265 L (9.3 fl oz U.S.)
Oil .......................................................... Bar and chain ............... ECHO bar and chain oil (or motor oil)
.............................................................. Tank Capacity ............... 155 L (5.4 fl. oz. U.S.)
.............................................................. Lubrication ................... Adjustable automatic oil pump
Guide bar / Saw chain ........................... Standard ....................... 12 in., 14 in.
.............................................................. Optional ........................ 12 in., 14 in., 16 in.
Standard features ......................................................................... Conventional handle
..................................................................................................... Rear hand guard
..................................................................................................... Front hand guard,
..................................................................................................... Anti-vibration device,
..................................................................................................... Throttle control lockout, Chain brake,
..................................................................................................... Chain catcher, Spark arrestor muffler
Idle Speed ..................................................................................... 2,700 - 3,300
Clutch Engagement ....................................................................... 4,200
Wide Open Throttle (WOT) ........................................................... 10,000 - 12,000
Kickback Safety Features ............................................................ Double Guard Low Kick Guide Bar
..................................................................................................... Low Kick Guard Link Saw Chain
..................................................................................................... Front Hand Guard/Chain Brake Lever
..................................................................................................... Chain Brake
..................................................................................................... Kick Guard
IMPORTANT
This spark ignition system complies with Canadian ICES-002.

6
CS-306
EMISSION D ATA
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 - Power Head
1 - Guide Bar
1 - Kick Guard
1 - Hex Head Bolt
1 - Hex Nut
1 - Saw Chain
1 - Instruction Manual
1 - Safety Manual
1 - Warranty Registration Card
1 - Limited Warranty Statement
1 - T-Wrench
1 - Echo Power BlendX TM 2-stroke oil sample
An Emission Control Label is located on the engine.
(These are EXAMPLES ONLY, information on label varies
by engine FAMILY).
IMPORTANT ENGINE INFORMATION
ENGINE FAMILY: 9EXHS.0334CA DISPLACEMENT: 30.1 CC
EMISSION COMPLIANCE PERIOD: 300 HOURS
THIS ENGINE MEETS U.S. EPA PH2 EXH AND 2007 AND
LATER CALIFORNIA EXH AND EVAP EMISSION
REGULATIONS FOR S.O.R.E. REFER TO OWNER'S
MANUAL FOR MAINTENANCE SPECIFICATIONS AND
ADJUSTMENTS.
PRODUCT EMISSION DURABILITY (EMISSION COMPLIANCE PERIOD)
The 300 hour emission 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.
EMISSION CONTROL (EXHAUST &
EVAPORATIVE)
EPA Phase 2 / C.A.R.B. TIER III
The emission control system for the engine is EM/
TWC (Engine Modification and 3-way Catalyst) and
for the fuel tank the Control System is EVAP (Evapora-
tive Emissions) or N (for nylon tank). Evaporative
emission may be applicable to California models only.
IMPORTANT ENGINE INFORMATION
ENGINE FAMILY: 9EXHS.0334CA DISPLACEMENT: 30.1 CC
EMISSION COMPLIANCE PERIOD : 300 HRS.
THIS ENGINE MEETS U.S. EPA PHASE 2 EMISSION
REGULATIONS FOR SMALL NONROAD ENGINES. REFER TO
OWNER'S MANUAL FOR MAINTENANCE SPECIFICATIONS
AND ADJUSTMENTS.

7
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
STANDARD SAFETY
REQUIREMENTS FOR
GASOLINE POWERED
CHAIN SAWS
(ANSI B175.1-2000)
NOMENCLATURE OF PARTS
11
12
1. Front handle
2. Hand guard
(Chain brake actuating lever)
3. Saw chain
4. Guide bar
5. Chain catcher
6. Sprocket guard
7. Muffler
8. Rear hand guard
9. Throttle control lockout
10. Throttle control trigger
11. Air cleaner cover
12. Chain tension adjustment screw
13. Pull starter
14. Throttle control latch
15. On / Off switch
16. Oil tank cap
17. Fuel tank cap
18. Purge bulb
19. Kick guard
20. Spark Plug
21. Guide Bar Nuts
22. Rear Handle
23. Choke
CS-306
14
16
17
18
13
19
P/N X505002310 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.
P/N 89019130131
ADVERTENCIA PELIGRO
P/N 89022839131
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 BAR AND CHAIN
Note:There may be other replace-
ment components for achieving
kickback protection. For details,
please refer to the chain and bar
combination sheet shown in the
instruction manual.
P/N X524001691
GUIDE BAR*CHAIN*
PART NO. TYPE LINKS
12” 12A4CD3745 OREGON 90SG
45
14” 14A4CD3752 OREGON 90SG
52
* If a decal cannot be read, a new one can be
ordered from your ECHO dealer.
P/N X505002060
P/N 89011439434
CS-
306
12
3
4
5
7
8
9
6
10
13
20
21
22
23

8
PREPARATION FOR USE
G
H
K
GUIDE BAR AND SAW CHAIN-INSTALL/
REMOVE
WARNING
Saw Chain is sharp! Always wear gloves when
handling assembly, otherwise serious personal injury
may result.
1. Move chain brake lever fully rearward to release
chain brake.
IMPORTANT
Always loosen guide bar nuts before turning chain
tension adjuster, otherwise clutch cover and
tensioner will be damaged.
2. Remove two guide bar nuts (I) and remove sprocket
guard (J).
3. Remove guide bar and saw chain if necessary.
NOTE: See “MAINTENANCE AND 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
guide bar facing forward.
IMPORTANT
Be certain tensioner fits into lower adjuster hole (K)
before tightening guide bar nuts.
NOTE
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.
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.
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.
WARNING
IMPROPER CLUTCH COVER ASSEMBLY CAN
RESULT IN SERIOUS INJURY, AND WILL CAUSE
SEVERE SAW DAMAGE IF UNIT IS STARTED.
NEVER START OR OPERATE SAW IF BRAKE BAND
IS NOT IN PLACE ON CLUTCH DRUM. ALWAYS
CHECK CHAIN BRAKE OPERATION AFTER RE-
PLACING COVER. DO NOT USE SAW IF CHAIN
BRAKE DOES NOT FUNCTION PROPERLY.
• Adjust saw chain tension, as instructed in “Adjust-
ment, Chain Tension.”
J
I
CS-306

9
L
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.
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 L UBRICANT
NOTICE: Use of unmixed, improperly mixed, or fuel older than 90 days, (stale fuel), may cause hard starting, poor
performance, or severe engine damage and void the product warranty. Read and follow instructions in the Storage
section of this manual.
FUEL STATEMENT
WARNING
Alternative fuels, such as E-20 (20% ethanol), E-85 (85% ethanol) or any fuels not meeting ECHO requirements are
NOT approved for use in ECHO 2-stroke gasoline engines. Use of alternative fuels may cause performance
problems, loss of power, overheating, fuel vapor lock, and unintended machine operation, including, but not limited
to, improper clutch engagement. Alternative fuels may also cause premature deterioration of fuel lines, gaskets,
carburetors and other engine components.
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 is NOT approved.
Two Stroke Oil - A two-stroke engine oil meeting ISO-L-EGD (ISO/CD 13738) and J.A.S.O. FC Standards must be
used. Echo brand premium Power Blend TM 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.

10
).S.U()CIRTEM(
SAGLIOSAGLIO
.laG.zo.lFretiL.cc
1
2
5
6.2
2.5
8.21
4
8
02
08
061
004
Fuel Mix Chart
50:1
Handling Fuel
DANGER
Fuel is VERY flammable. Use extreme care when mixing,
storing or handling or serious personal injury may result.
• Use an approved fuel container.
• DO NOT smoke near fuel.
• 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
outdoors over bare ground.
• 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.
• Move at least 3m (10 ft.) from refueling location before
starting the engine.
Mixing Instructions
1. Fill an approved fuel container with half of the required
amount of gasoline.
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
the use of automatic fuel shut-off contain-
ers to reduce fuel spillage.
After use
• DO NOT store a unit with fuel in its tank. Leaks
can occur. Return unused fuel to an approved
fuel storage container.
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, unoccupied building, away from
sparks and flames.
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
before each use.
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.
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.
• 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.
• 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.
FUEL TANK OIL TANK
TANK INDICATION

11
OPERATION
WHEN THE ENGINE IS COLD
WARNING
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).
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.
NOTE
If engine does not start after 5 pulls, repeat instructions.
WARNING
Moving parts can amputate fingers or cause severe injuries. Keep hands, clothing and loose objects away from
all openings. Always stop engine, disconnect spark plug, and make sure all moving parts have come to a com-
plete stop before removing obstructions, clearing debris, or servicing unit.
WARNING
Engine exhaust IS HOT, and contains Carbon Monoxide (CO), a poison gas. Breathing CO can cause uncon-
sciousness, serious injury, or death. Exhaust can cause serious burns. ALWAYS position unit so that exhaust is
directed away from your face and body.
Securely hold the saw.
B
C
A
WARNING
Operation of this equipment may create sparks that can start fires around dry vegetation. This unit is equipped
with a spark arrestor and a spark arrestor may be required. The operator should contact local fire agencies for
laws or regulations relating to fire prevention requirements.

12
WHEN ENGINE IS HARD TO START
WARNING
Clutch engages and chain may rotate when engine is started
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. Move chain brake lever fully forward to engage chain brake
before starting.
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 posi-
tion.
Do not allow recoil handle to snap back against the casing.
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. Move chain brake lever fully forward to engage chain brake
before starting.
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

13
A
RUNNING
WARNING
The saw chain should not move at idle, otherwise serious
personal injury may result.
NOTE
If saw chain moves adjust carburetor according to “Carbu-
retor 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. Move chain brake lever fully forward to engage chain.
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.

14
WARNING
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.
(Example: Palm Tree Acid, fertilizer, etc.) To avoid housing
deterioration, carefully remove all packed saw dust around
clutch and guide bar area and wash with water. Coat metal
parts with light oil.
WARNING
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!
Kickback
CUTTING I NSTRUCTIONS
GENERAL

15
2”
45°
2”
FELLING A TREE
DIRECTION
OF FALL
Direction of fall
Hinge
Felling cut
First cut
Notch
Second cut
One-third tree
diameter
LIMBING
WARNING
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.
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.
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 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.

16
BUCKING
Uphill position
FINISH CUT
FIRST CUT
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
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.
When cutting on a slope or hillside, always stand uphill.
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.
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.
WARNING
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
backwards towards the 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.

17
MAINTENANCE AND CARE
WARNING
Moving parts can amputate fingers or cause severe injuries. Keep hands, clothing and loose objects away from
all openings. Always stop engine, disconnect spark plug, and make sure all moving parts have come to a com-
plete stop before removing obstructions, clearing debris, or servicing unit. Allow unit to cool before performing
service. Wear gloves to protect hands from sharp edges and hot surfaces.
Your ECHO unit is designed to provide many hours of trouble free service. Regular scheduled maintenance will help your
unit 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. Common tools may be required.
Level 2= Moderate difficulty. Some specialized tools may be required.
ECHO offers REPOWERTM Maintenance Kits and Parts to make your maintenance job easier.
MAINTENANCE INTERVALS
COMPONENT/
SYSTEM
MAINTENANCE
PROCEDURE
REQ'D
SKILL
LEVEL
DAILY OR
BEFORE
USE
EVERY
REFUEL
3 MONTHS
OR 90
HOURS
YEARLY 600
HOURS
Air Filter Inspect/Clean 1I / C * R *
Automatic Oiler Inspect/Adjust 1I
Oil Filter Inspect/Replace 1I I/C *
Fuel System Inspect/Replace 1I (1) * I (1) *
Fuel Filter Inspect/Replace 1I * I / R *
Fuel Cap Gasket Replace 1I * R
Guide Bar & Sprocket
Nose Inspect/Clean/Lubricate 1I / C * I
Saw Chain Inspect/Sharpen/Replace/
Tensioning 2I *
Sprocket Inspect/Replace 2I *
Spark Plug Inspect/Clean 1I / C / R *
Cooling System Inspect/Clean 2I / C
Muffler Spark Arrestor Inspect/Clean/Replace 2I / C / R *
Cylinder Exhaust Port Inspect/Clean/Decarbon 2I / C
Recoil Starter Rope Inspect/Clean 1I / C *
Screws/Nuts/Bolts Inspect/Tighten/Replace 1I *
(1) Low evaporative fuel tanks DO NOT require regular maintenance to maintain emission integrity.
* Replacement is recommended based on the finding of damage or wear during inspection.
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:

18
D
E
G
F
AUTOMATIC OILER
• The discharge volume of the automatic oiler is adjusted to 3
to 4 cc/mm (@ 7000 rpm) prior to shipment from the factory.
• Always check oil discharge when in use.
• Turn adjusting screw (D) counter-clockwise to increase oil
volume, clockwise to decrease oil volume.
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. When the inside of the tank gets dirty, rinsing the tank out with
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
abnormalities in engine performance.
3. Pick up the fuel strainer (G) through fuel inlet port with a piece
of steel wire, or the like.
4. When the strainer is dirty, replace, or wash it in suitable
cleaning fluid.
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
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
the rubber sealing edges are deformed.
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.

19
Worn : 0.5 mm
J
I
H
GUIDE BAR AND OIL HOLES
• Follow instructions for “Guide Bar and Saw Chain –
Install/Remove
• Clean after each use
- Clean the grooves (H) of the guide bar with a small
screwdriver.
- Clean oil holes (I) with a wire.
• Reverse guide bar periodically.
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.
• Check sprocket when you install new chain. Replace it
if worn.
• Clean sprocket, clutch, and bar mount area before
installation of bar.
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
• Check periodically
• 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 kgf • cm (130 – 150 in • lbf)
IMPORTANT
Do not over-torque.

20
COOLING SYSTEM CLEANING
• Remove spark plug lead.
• Remove two (2) muffler cover screws and muffler
cover (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
engine output and overheating. Spark arrestor
screen must be checked periodically.
1. Remove muffler cover screws and remove muffler
cover.
2. Remove spark arrestor screen cover, gaskets, and
screen from muffler body.
3. Clean carbon deposits from muffler components
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
holes burned through.
5. Assemble components in reverse order.
A
CS-306