Echo Instruction Manual User manual

X7503207801 X750022241
06/13
WARNING
Users of this equipment risk injury to themselves and others if the unit is used
improperly and/or safety precautions are not followed. ECHO provides an
operator’s manual and a safety manual. Both must be read and understood for
proper and safe operation. Failure to do so could result in serious injury.
Chain Saw
Instruction Manual
MODEL : CS-303T

2
Table OfCOnTenTs
PACKING LIST .................................................................................................................3
RULES FOR SAFE OPERATION.....................................................................................4
SYMBOLS AND SIGNS....................................................................................................8
DECALS ...........................................................................................................................9
EMISSION DATA..............................................................................................................9
NOMENCLATURE OF PARTS.......................................................................................10
PREPARATION FOR USE ............................................................................................. 11
FUEL AND LUBRICANT.................................................................................................12
OPERATION...................................................................................................................14
CUTTING INSTRUCTIONS............................................................................................17
CHAIN AND GUIDE BAR COMBINATIONS...................................................................20
MAINTENANCE AND CARE ..........................................................................................21
Carburetor Adjustment.................................................................................................22
High Altitude Operation............................................................................................... 22
TROUBLESHOOTING ...................................................................................................28
STORAGE AFTER USE .................................................................................................29
TECHNICAL DATA .........................................................................................................30
WARRANTY STATEMENTS ..........................................................................................31
SERVICING INFORMATION..........................................................................................36
Copyright© 2013 By Echo, Incorporated
All Rights Reserved.
This chain saw is designed for cutting wood or wood products. Do not cut solid metal, sheet metal, plastic
or any non-wood materials.
Specications, descriptions and illustrative material in this literature are as accurate as known at the time of
publication, but are subject to change without notice.
Illustrations may include optional equipment and accessories, and may not include all standard equipment.

3
*
X7503206101 X750009891
11/08
WARNING
Readrules for safe operation and instructions carefully. ECHO provides an Instruc-
tionManual and a Safety Manual.Both must be read and understood for proper and
safeoperation.
Chain Saw
Instruction Manual
MODEL : CS-341
PaCking lisT
The ECHO product you purchased has been factory pre-assembled for your convenience. Due to packaging restric-
tions, 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 - CS-303T 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 - Emission Control Warranty Statement
1 - Warranty Registration Card
1 - Assembly Tool (s)
1 - Echo Power BlendX TM 2-stroke oil sample
* The machine may be delivered with guide bar and
saw chain assembled.

4
Rules fOR safe OPeRaTiOn
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. Either 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 recommended for beginners, homeowners, or
chain saw novices. Most cutting operations can be ac-
complished 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 surprise. Sudden surprise
contributes to accidents.
2. Keep a good rm 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 rm
grip with thumbs and ngers encircling the chain saw
handles. A rm 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 cutting 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 maintenance
instructions for the saw chain.
7. Only use replacement bars and chains specied by
the manufacturer or the equivalent.
Rotational kickback
Chain moving downward at contact
Rotational kickback
Kickback Danger
Zone
Pinch
Kickback
Linear Kickback
Kickback Safety Precautions for Chain Saw Users

5
Chain brake function
When the lever is pushed forward, chain brake
instantly stops the chain.
Chain brake unlock
When the lever is fully pulled, toward the
operator, brake is unlocked.
CHAIN BRAKE OPERATION
• Set the lever in the unlocked position before starting to
cut.
• If the brake is tripped by kickback reaction, the chain
will stop immediately. Release the throttle to avoid pos-
sible damage to the engine or clutch.
• Do not attempt to operate the engine with the brake
locked.
TESTING THE BRAKE
• Start the engine on a solid level surface and run at a
fast idle until warm.
• Hold the saw rmly by the handles and accelerate the
engine to a fast idle.
• Slowly operate the chain brake lever while holding the
saw rmly on the ground. When the brake lever trips,
the chain should stop. Immediately release the throttle
trigger.
IMPORTANT
Do not allow the saw to tip forward in order to avoid
damage to the chain.
WARNING
If the chain does not stop immediately, return the saw
to your authorized ECHO dealer for repair.
NOTE
• For practice, while cutting a small tree, push the
lever forward to lock the brake.
• Conrm that the brake works properly before each
use.
• If the chain brake is clogged with wood chips, func-
tion of the brake may deteriorate. Always keep the
device clean.
• Do not increase engine RPM's while the chain brake
is locked.
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 ofces, 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 fol-
lows.
USA : ANSI Standard B175.1
Safety Requirement for chain saws
Canada : CSA Standard Z 62.1 CHAIN SAWS
WARNING
ANSI Standard B175. 1 stipulates that the brake
shall stop the chain 0.12 seconds at an engine
speed of 13500 r/min. 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.

6
1. Do not operate a chain saw with one hand! Serious
injury to the operator, helpers, bystanders, or any
combination of these persons 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-tting clothing and
protective gloves. Wear eye, hearing, and head
protection devices.
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.
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
mufer 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.
Other Safety Precautions
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 toward 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 bers 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 specically trained to do so.
17. All chain saw service, other than items listed in the
Instruction manual maintenance instructions, should
be performed by competent service personnel.
(For example, if improper tools are used to remove
the ywheel or if an improper tool is used to hold
the ywheel in order to remove the clutch, structural
damage to the ywheel could occur and could
subsequently cause the ywheel to burst.)
18. When transporting your chain saw, use the
appropriate guide bar scabbard.
19. Spark arrestor mufers approved to SAE Standard
J335 are standard on ECHO chain saws to reduce
the possibility of forest res.
Do not operate the chain saw with a loose or
defective mufer. Do not remove the spark arrestor
screen.
WARNING
• During operation, the mufer or catalytic mufer 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 mufer.
• Always keep exhaust area clear of ammable 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
Moving parts can amputate ngers 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 complete stop
before removing obstructions, clearing debris, or servicing unit.
• DO NOT start or operate unit unless all guards and protective covers are properly assembled to unit.
• NEVER reach into any opening while the engine is running. Moving parts may not be visible through openings.

7
VIBRATION AND COLD
• It is believed that a condition called Raynaud’s Phe-
nomenon, which affects the ngers of certain individu-
als, may be brought about by exposure to vibration
and cold. Exposure to vibration and cold may cause
tingling and burning followed by loss of color and
numbness in the ngers. The following precautions
are strongly recommended because the minimum
exposure which might trigger the ailment is unknown.
• Keep your body warm, especially the head and neck,
feet and ankles and hands and wrists.
• Maintain good blood circulation by performing vigor-
ous arm exercises during frequent work breaks and
also by not smoking.
• Limit the number of hours of operation. Try to ll each
day with jobs where operating the chain saw, or other
hand-held power equipment is not required.
• If you experience discomfort redness and swelling of
the ngers, followed by whitening and loss of feeling,
consult your physician before further exposing yourself
to cold and vibration.
REPETITIVE STRESS INJURY
• It is believed that over-using the muscles and tendons
of the nger, hands, arms and shoulders may cause
soreness, swelling, numbness, weakness and extreme
pain to the areas just mentioned. Certain repetitive
hand activities may put you at a high risk for develop-
ing a repetitive stress injury (RSI).
• An extreme RSI condition is Carpal Tunnel Syndrome
(CTS) which could occur when your wrist swells and
squeezes a vital nerve that runs through the area.
Some believe that prolonged exposure to vibration
may contribute to CTS.
CTS can cause severe pain for months or even years.
To reduce the risk of RSI/CTS, do the following:
• Avoid using your wrist in a bent, extended or twisted
position.
• Take periodic breaks to minimize repetition and rest
your hands.
• Reduce the speed and force in which you do the re-
petitive movement.
• Do exercises to strengthen hand and arm muscles.
• See a doctor if you feel tingling, numbness or pain in
your ngers, hands, wrists or arms. The sooner RSI/
CTS is diagnosed, the more likely permanent nerve
and muscle damage can be prevented.
EYE AND HEARING PROTECTION
• Wear eye protection goggles that meet ANSI
Z 87.1 requirements.
Goggles meeting the requirements have the mark “Z
87” stamped on them.
• Wear hearing protection.
If this guideline is not followed, hearing loss can occur.
ECHO recommends wearing hearing protection at all
times.
WEAR PROPER CLOTHING
• Snug tting durable clothing should be worn. Pants
should have long legs.
• DO NOT WEAR SHORTS. Do not wear loose tting
clothing, scarves, neckties, jewelry or any item that
may become tangled in surrounding growth or the
chain saw itself.
• Wear shoes with non-skid soles. DO NOT wear open
toed shoes or operate unit barefooted.
• Wear no-slip, heavy duty work gloves to improve your
grip on the chain saw handles. The gloves also help
reduce the transmission of machine vibration to your
hands.
• Keep long hair away from engine and air intake. Re-
tain hair with cap or net.
HOT HUMID WEATHER
• Heavy protective clothing can increase operator fa-
tigue which may lead to heat stroke. Schedule heavy
work for early morning, or late afternoon hours when
temperatures are cooler.
AVOID HOT SURFACES
• During operation, the mufer or catalytic mufer 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 mufer.
• Always keep exhaust area clear of ammable debris
during transportation or when storing, otherwise seri-
ous property damage or personal injury may result.
OPERATOR SAFETY
WARNING
The ignition components of this machine generate an electromagnetic eld during operation which may interfere
with some pacemakers. To reduce the risk of serious or fatal injury, persons with pacemakers should consult
with their physician and the pacemaker manufacturer before operating this machine. In the absence of such
information, ECHO does not recommend the use of ECHO products by anyone who has a pacemaker.

8
Carburetor adjustment
- Idle speed
Carburetor adjustment
- High speed mixture
WARNING!!
Read and follow all safety
precaution in the instruction
manual. Failure to follow
instructions could result in
serious personal injury.
Wear eyes, ears and head
protection
Carburetor adjustment
- Low speed mixture
Oil and gasoline mixture
Symbol form/shape Symbol description/application Symbol form/shape Symbol description/application
Chain brake operation
Emergency stop
Choke control “Cold Start”
position (choke closed)
Contact of the guide bar tip
with any object should be
avoided
Tip contact may cause the
guide bar to move suddenly
upward and backward, which
may cause serious injury
Both of the operator’s hands
must be used to operate the
chain saw
Chain oiler adjustment
Purge pump
Hot surface
Chain oil ll
STOP
SYMBOLS AND SIGNS
WARNING
The safety alert symbol accompanied by
the word “WARNING” calls attention to an
act or condition which CAN lead to serious
personal injury or death if not avoided.
CAUTION
The safety alert symbol accompanied by
the word “CAUTION” calls attention to an
act or condition which may lead to minor or
moderate personal injury if not avoided.
NOTICE
This enclosed message provides tips for use,
care and maintenance of the unit.
IMPORTANT
The enclosed message provides information
necessary for the protection of the unit.
DANGER
The safety alert symbol accompanied by
the word “DANGER” calls attention to an
act or condition which WILL lead to serious
personal injury or death if not avoided.
CIRCLE AND SLASH SYMBOL
This symbol means the specic action
shown is prohibited. Ignoring these
prohibitions can result in serious or
fatal injury.

9
Locate these safety decals on your
unit. Make sure the decals are legible
and that you understand and follow the
instructions on them. If a decal cannot
be read, a new one can be ordered
from your ECHO dealer.
Decals
emissiOn DaTa
An Emission Control Label is located on the engine. (is is
an EXAMPLE ONLY, information on label varies by engine
FAMILY).
emissiOn COnTROl (exHausT &evaPORaTive)
EPA 2010 and Later and/or C.A.R.B. TIER III
PRODUCT EMISSION DURABILITY (EMISSION COMPLIANCE PERIOD)
The 50 or 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 mainte-
nance procedures are followed as listed in the Maintenance Section of this manual.
The emission control system for the engine is EM (en-
gine modication) and, if the second to last character of
the Engine Family on the Emission Control Information
label (sample below) is “C”, “K”, or “T”, the emission
control system is EM and TWC (3-way catalyst). The fuel
tank/fuel line emission control system is EVAP (evapo-
rative emissions). Evaporative emissions for California
models are only applicable to fuel tanks.
GUIDE BAR CHAIN
PART NO. PART NO.
12” 12A0CD3745 91PX45CQ
14” 14A0CD3752 91PX52CQ
Note:There may be other replacement
components for achieving kickback
protection. For details, please
refer to the chain and bar combi-
nation sheet shown in the instruction
manual.
REPLACEMENT BAR AND CHAIN

10
1. Chain brake locking lever/
Hand guard
2. Throttle control lockout
3. Throttle trigger
4. Sprocket guard
5. Chain catcher
6. Air cleaner cover
7. Purge bulb
8. Guide bar
9. Saw chain
10. Choke Knob
nOmenClaTuRe Of PaRTs
1
2
4
5
68
9
11
15
17
18
3
7
10
12
13
14
16
19
20
21
11. On / Off switch
12. Fuel tank cap
13. Pull starter
14. Oil tank cap
15. Throttle lock button
16. Kick Guard
17. Catalytic mufer
18. Lanyard ring
19. Spark Plug
20. Rear Handle
21. Front Handle

11
kiCk guaRD® TO baR insTRuCTiOns
For saws with Kick Guard®P/N 2894901 and symmetri-
cal 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 ush against guide bar.
NOTE
The machine may be delivered with guide bar, tip
guard, and saw chain separated. Install guide bar, tip
guard, and saw chain as follows.
guiDe baR anD saw CHain-insTall/
RemOve
NOTE
Move chain brake lever fully rearward to remove or
install clutch cover to saw.
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. Remove two guide bar nuts and remove guide bar cover.
Turn tension adjustment screw counterclockwise 2 to 3
turns if bar and chain are installed.
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.
6. Align holes of clutch cover (J) with guide bar studs,
and tensioner pin (I) with lower guide bar adjuster hole.
Install cover. Tighten guide bar nuts nger tight.
WARNING
IMPROPER CLUTCH COVER ASSEMBLY CAN RE-
SULT IN SERIOUS INJURY, AND WILL CAUSE SE-
VERE 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 REPLACING
COVER. DO NOT USE SAW IF CHAIN BRAKE DOES
NOT FUNCTION PROPERLY.
PRePaRaTiOn fOR use
H
I
J
7. Turn saw over and check brake band for correct posi-
tion around clutch drum. If brake band is not in place
around drum, remove clutch cover, make sure brake is
released, and reinstall.
G
WARNING
Saw Chain is sharp! Always wear gloves when
handling assembly, otherwise serious personal
injury may result.

12
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, if necessary.
3. Hold the bar nose up, and turn the adjuster screw (L)
clockwise until chain ts snugly against underside of
bar.
4. Tighten both guide bar nuts with bar nose held up.
5. Pull the saw chain around the guide bar by hand.
Reduce chain tension, if you feel tight spots.
6. When chain is properly tensioned, tighten guide bar
nuts securely - 90 – 110 kgf • cm (80 – 95 in • lbf.).
7. Keep chain properly tensioned at all times.
NOTE
All chains require frequent adjustments.
L
fuel anD lubRiCanT
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-15 (15% 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 known to be good quality. Gasoline may contain
up to 10% Ethanol (grain alcohol) or 15% MTBE (methyl tertiary-butyl ether). Gasoline containing methanol (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. FD Standards must be
used. Echo brand premium Power Blend X TM Universal 2-Stroke Oil meets these standards. Engine problems due to
inadequate lubrication caused by failure to use an ISO-L-EGD (ISO/CD 13738) and J.A.S.O. FD certied oil, such as
Echo premium Power Blend X TM, will void the two-stroke engine warranty.
IMPORTANT
Echo premium Power Blend X TM Universal 2-Stroke Oil may be mixed at 50:1 ratio for application in all Echo en-
gines sold in the past regardless of ratio specied in those manuals.

13
Handling Fuel
DANGER
Fuel is VERY ammable. 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 ames 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 RUN-
NING!
• DO NOT ll fuel tanks indoors. ALWAYS ll fuel tanks
outdoors over bare ground.
• DO NOT overll 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 hydrocarbon emissions.
Some states may require the use of automatic fuel shut-
off containers 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 ames.
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.
CHain lubRiCanT
Proper lubrication of the chain while in operation reduces fric-
tion 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 rell chain oil.
FUEL TANK OIL TANK
TANK INDICATION
Fuel Mix Chart
50:1

14
OPeRaTiOn
WARNING
Moving parts can amputate ngers 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.
WARNING
Operation of this equipment may create sparks that can start res. This unit is equipped with a spark arrestor to
prevent discharge of hot particles from the engine. Metal blade use also can create sparks if the blade strikes
rocks, metal, or other hard objects. Contact local re authorities for laws or regulations regarding re prevention
requirements.
11
A
B
C
O PERATION
STARTING
COLD ENGINE
WARNING
Make sure bar and chain are not touching anything when starting
the saw.
1. Move chain brake lever fully forward to lock 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. Lay unit on a flat, clear area and keep bar and chain clear of all
obstacles.
5. Turn switch (A) to “RUN” position (I).
6. Pull choke (B) all the way out (closed position).
7. Push purge bulb (C) 10 times.
8. Pull starter handle several times until first firing sound is heard.
(Secure unit on ground with your knee or foot.) (5 - 6 pulls
maximum.)
9. Push choke (B) all the way in. (open position)
10. 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 blow exhaust away from your
face and body.
C
B
NOTICE
Do not increase engine speed while chain brake is locked.
Severe brake damage will result.
A
WARNING
The ignition components of this machine generate an electromagnetic eld during operation which may interfere
with some pacemakers. To reduce the risk of serious or fatal injury, persons with pacemakers should consult
with their physician and the pacemaker manufacturer before operating this machine. In the absence of such
information, ECHO does not recommend the use of ECHO products by anyone who has a pacemaker.

15
wHen engine is HaRD TO sTaRT
WARNING
Clutch engages and chain may rotate when engine is started
with throttle lock button engaged. Do not start engine before
chain brake is locked.
1. Ensure that there is fuel and chain oil in the tanks.
2. Move chain brake lever fully forward to lock chain brake
before starting.
3. Lay unit on a at, clear area and keep bar and chain clear of
all obstacles.
4. Press throttle control lockout down, squeeze throttle trigger,
and push in throttle lock button (D).
5. While depressing the throttle lock button, release the throttle
trigger and then release the lock button.
6. Turn switch (A) to “RUN” position (I).
7. Pull starter handle.
A
D
NOTE
Do not pull starter rope out to the maximum possible position.
Do not allow recoil handle to snap back against the casing.
CAUTION
• After starting the engine, immediately squeeze and then
release throttle trigger to release throttle lock button,
otherwise severe brake damage may occur.
• Never use throttle lock button for cutting.
• Use the throttle lock button only in starting.
NOTICE
Do not increase engine speed while chain brake is locked.
Severe brake damage will result.

16
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 “Carburetor
Adjustment” instructions in this manual, or see your dealer.
1. After engine starts, allow it to return to idle.
2. Move chain brake lever fully rearward to unlock chain brake.
3. Press throttle control lockout then gradually squeeze throttle
trigger to increase engine speed.
4. Saw chain starts moving when the engine reaches approx-
imately 4,400 rpm.
5. Ensure proper acceleration and lubrication of chain and bar.
6. Do not run the engine at high speed unnecessarily.
7. 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 lock chain brake.
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
sTaRTing waRm engine
1. Ensure that there is fuel and chain oil in the tanks. (If fuel tank
was emptied during previous operation, rell tank and push
purge bulb 10 times.)
2. Move chain brake lever fully forward to lock chain brake be-
fore starting.
3. Lay unit on a at, clear area and keep bar and chain clear of
all obstacles.
4. Turn switch (A) to “RUN” position (I).
5. Pull starter handle.
6. Choke may be used if necessary, but be sure to push it back
on rst ring sound.
NOTE
If engine does not start after 5 pulls, use cold start procedure.
NOTICE
Do not increase engine speed while chain brake is locked.
Severe brake damage will result.
A

17
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 difcult 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 nger.
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 difcult.
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 insTRuCTiOns

18
WARNING
A falling tree can seriously damage anything 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 rst 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 op-
posite 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 rst cut, very carefully so as not to cause kickback.
The nal 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
stand on the tree that you are limbing. When limbing, cau-
tion is the word. Be careful of the tip touching other limbs.
Always use both hands.
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

19
BUCKING
Uphill position
FINISH CUT
FIRST CUT
Board or at stones
Don’t cut with the saw overhead or the bar in a vertical po-
sition. 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 at 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 ying debris.
To cut the trunk, use the bucking and two-cut sequence
shown. The rst cut should be no deeper than one-third the
trunk diameter.

20
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 name
of the Echo dealer nearest you, Call: 1-800-432-ECHO (3246) or on the web at www.echo-usa.
com.
Refer to your Chain Saw Safety Manual for kick guard application information.
CHain anD guiDe baR COmbinaTiOns
The following combinations may be used on CS-303T.
WARNING
Use of replacement saw chain and/or guide bar other than that specied, or operation without the “tip guard” in place,
may cause severe kickback resulting in serious injury.
Only use saw chain designated as, “LOW-KICKBACK,” that meets the ANSI B175.1 Standard and/or CSA Z62.3
requirements when tested on the representative sample of chain saws below 3.8 C.I.D., and the Echo guide bar
specied.
*Reduced nose radius symmetrical bars (OREGON name — Double Guard)
SAW CHAIN
(Low-kickback)
CAUTION
Do not use replacement saw chain unless it
has been designated as meeting the ANSI
B175.1 and/or CSA Z62.3 kickback performance
requirements, when tested on the representative
sample of chain saws below 3.8 c.i.d. specied
in ANSI B175.1 and/or CSA Z62.3.
NOTE
LOW KICKBACK SAW CHAIN meets the
kickback performance requirements of ANSI
B175.1 and/or CSA Z62.3 (safety requirements
for gasoline-powered chain saws).
GUIDE BAR
(Low-kickback)
Replacement guide bars.
The following guide bars may be considered to
have equivalent kickback energy.
• Sprocket nose guide bars of the same length and nose
radius, same pitch and having the same number of
teeth.
• Hard nose guide bars of the same length and nose
radius as a sprocket nose bar.
LOW KICKBACK
GUIDE BAR LOW KICKBACK SAW CHAIN KICK GUARD
LENGTH BAR P/N CHAIN P/N LINKS TYPE PITCH GAUGE ECHO P/N (OEM
P/N)
12 in 12A0CD3745 91PX45CQ
91VG45CQ 45 91PX
91VG 3/8” 0.050 2894901 28949
14 in 14A0CD3752 91PX52CQ
91VG52CQ 52