x7722271404 / x772000164
CS-303T
CHAIN SAW
Instruction Manual
Burn Hazard
The muffler or catalytic muffler and surrounding cover may become extremely hot.
Always keep clear of exhaust and muffler area, otherwise serious personal injury may
occur.
The engine exhaust from this product contains chemicals known to the State of California to cause
cancer, birth defects or other reproductive harm.
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.
Specifications, 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.
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TABLE OF CONTENTS
CS-303T
TABLE OF CONTENTS
Rules For Safe Operation............................................................................................................................................... 4
Correct Use Of Chain Brake........................................................................................................................................... 5
Personal Condition and Safety Equipment..................................................................................................................... 8
Symbols and Signs....................................................................................................................................................... 11
EPA 2010 and Later and/or C.A.R.B. TIER III.............................................................................................................. 12
Description........................................................................................................................................................................... 13
Operation............................................................................................................................................................................. 17
Cutting Instructions....................................................................................................................................................... 22
Chain And Guide Bar Combination............................................................................................................................... 25
Spark Plug.................................................................................................................................................................... 29
Exhaust Port Cleaning.................................................................................................................................................. 32
Setting The Saw Chain................................................................................................................................................. 33
Troubleshooting................................................................................................................................................................... 35
Storage After Use......................................................................................................................................................... 36
Technical Data..................................................................................................................................................................... 37
Warranty Statements........................................................................................................................................................... 38
Echo Consumer Product Support................................................................................................................................. 43
Warranty Registration................................................................................................................................................... 43
Additional or Replacement Manuals............................................................................................................................. 43
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CS-303T
PACKING LIST
PACKING LIST
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 packing list to check for missing parts.
*Some Echo units may be factory pre-assembled. Assembly tools are not supplied with these units.
____ - 1 - Power Head
____ - 1, Instruction manual
____ - 1, Safety Manual
____ - 1, Emission Control Warranty Statement
____ - 1, Warranty Registration Card
____ - 1, Echo Power Blend X™ 2-Stroke Oil Sample
*____ - Assembly Tool(s) (If necessary)
*____ - 1, Guide bar
*____ - 1, Saw chain
*____ - 1, Tip Guard Assembly
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SAFETY
CS-303T
SAFETY
Rules For Safe Operation
Kickback Safety Precautions for Chain Saw Users
For more information
scan this QR code.
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.
Rotational kickback
The tip guard device is not installed on the guide bar when you
purchase your ECHO chain saw. The tip 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 accomplished with the tip guard in place.
Rotational kickback
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.
Chain moving downward at impact
Kickback Danger Zone
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 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 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.
Linear kickback
Pinch
4. Cut at high engine speeds.
5. Do not overreach or cut above shoulder height.
Kickback
6. Follow manufacturer’s sharpening and maintenance
instructions for the saw chain.
7. Only use replacement bars and chains specified by the
manufacturer or the equivalent.
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CS-303T
SAFETY
Correct Use Of Chain Brake
CHAIN BRAKE OPERATION
Locked
• 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 possible damage to
the engine or clutch.
• Do not attempt to operate the engine with the brake locked.
TESTING THE BRAKE
Unlocked
• 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.
Do not allow the saw to tip forward in order to avoid damage to the chain.
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.
• Confirm that the brake works properly before each use.
• If the chain brake is clogged with wood chips, function of the brake may deteriorate. Always keep the
device clean.
• Do not increase engine RPM's while the chain brake is locked.
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 Safety Requirement for chain saws
ANSI Standard B175.1 stipulates that the brake shall stop the chain 0.12 seconds at an engine speed
of 13,500 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 here in order to ensure
that the brake performance is maintained in compliance with the Standard B175.1.
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SAFETY
CS-303T
AUTOMATIC CHAIN BRAKE
Kickback produced from the tip of the guide bar will trip the
automatic chain brake. To make sure that the automatic chain
brake operates properly, follow these steps:
1. Stop the engine.
55 cm
(22 in.)
2. Hold the saw with the guide bar approximately 55 cm (22
in.) above a wooden surface. Right hand should hold the
rear handle, and left hand should hold the front handle.
3. Release the front handle and drop the end of the guide bar
against the wooden surface.
4. The impact should lock the chain brake.
When checking the operation of the automatic chain brake, use
a soft surface substance like wood to absorb the impact so the
chain is not damaged.
Other Safety Precautions
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-fitting 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 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 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 fibers is released.
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CS-303T
SAFETY
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 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
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 Standard J335 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.
• 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.
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
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.
Using improper replacement components or removing safety devices may result in serious or fatal
injury.
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.
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SAFETY
CS-303T
Personal Condition and Safety Equipment
Users of this product risk injury to themselves and others if the unit is used improperly and/or safety
precautions are not followed. Proper clothing and safety gear must be worn when operating unit.
Physical Condition
Your judgment and physical dexterity may not be good:
• if you are tired or sick,
• if you are taking medication,
• if you have taken alcohol or drugs.
Operate unit only if you are physically and mentally well.
Eye Protection
Eye protection that meets ANSI Z87.1, CE, or CSA Z94.3 requirements must be worn whenever you operate
the unit.
Hand Protection
Wear no-slip, heavy duty work gloves to improve your grip on the handles. Gloves also reduce the
transmission of machine vibration to your hands.
Breathing Protection
Wear a face mask to protect against dust.
Hearing Protection
ECHO recommends wearing hearing protection whenever unit is used.
Proper Clothing
Wear snug fitting, durable clothing;
• Pants should have long legs, shirts with long sleeves.
• DO NOT WEAR SHORTS,
• DO NOT WEAR TIES, SCARVES, JEWELRY, or clothing with loose or hanging items that could become
entangled in moving parts or surrounding growth.
Wear sturdy work shoes with nonskid soles;
• DO NOT WEAR OPEN TOED SHOES,
• DO NOT OPERATE UNIT BAREFOOTED.
Wear no-slip, heavy duty work gloves.
Keep long hair away from engine and air intake. Retain hair with cap or net.
Hot Humid Weather
Heavy protective clothing can increase operator fatigue which may lead to heat stroke. Schedule heavy work
for early morning or late afternoon hours when temperatures are cooler.
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CS-303T
SAFETY
The ignition components of this machine generate an electromagnetic field 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.
Vibration and Cold
It is believed that a condition called Raynaud’s Phenomenon,
which affects the fingers of certain individuals, may be brought
about by exposure to vibration and cold. Exposure to vibration
and cold may cause tingling and burning sensations, followed
by loss of color and numbness in the fingers. The following
precautions are strongly recommended, because the minimum
exposure, which might trigger the ailment, is unknown.
• Keep your body warm, especially the head, neck, feet, ankles,
hands, and wrists.
• Maintain good blood circulation by performing vigorous arm exercises during frequent work breaks, and
also by not smoking.
• Limit the hours of operation. Try to fill each day with jobs where operating the unit or other hand-held
power equipment is not required.
• If you experience discomfort, redness, and swelling of the fingers followed by whitening and loss of feeling,
consult your physician before further exposing yourself to cold and vibration.
Repetitive Stress Injuries
It is believed that overusing the muscles and tendons of the
fingers, hands, arms, and shoulders may cause soreness,
swelling, numbness, weakness, and extreme pain in those
areas. Certain repetitive hand activities may put you at a high
risk for developing 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. Instead try to maintain a straight wrist
position. Also, when grasping, use your whole hand, not just the thumb and index finger.
• Take periodic breaks to minimize repetition and rest your hands.
• Reduce the speed and force with which you do the repetitive movement.
• Do exercise to strengthen the hand and arm muscles.
• Immediately stop using all power equipment and consult a doctor if you feel tingling, numbness, or pain in
the fingers, hands, wrists, or arms. The sooner RSI/CTS is diagnosed, the more likely permanent nerve
and muscle damage can be prevented.
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SAFETY
CS-303T
All over head electrical conductors and communications wires can have electricity flow with high
voltages. This unit is not insulated against electrical current. Never touch wires directly or indirectly,
otherwise serious injury or death may result.
Do not operate this product indoors or in inadequately ventilated areas. Engine exhaust contains
poisonous emissions and can cause serious injury or death.
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CS-303T
SAFETY
Symbols and Signs
Symbol form/shape
Symbol description/application
Symbol form/shape
Symbol description/application
WARNING!!
Read and follow all safety
precaution in the instruction
manual. Failure to follow
instructions could result in serious
personal injury.
Choke control “Cold Start” position
(choke closed)
Wear eyes, ears and head
protection
Oil and gasoline mixture
Tip contact may cause the guide
bar to move suddenly upward and
backward, which may cause
serious injury
Chain oil fill
Chain oiler adjustment
Purge pump
Contact of the guide bar tip with
any object should be avoided
Both of the operator’s hands must
be used to operate the chain saw
Hot Surface
Carburetor Adjustment - Low
speed mixture
Chain brake operation
Emergency stop
Carburetor Adjustment - High
speed mixture
Carburetor Adjustment - Idle
speed
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EMISSION CONTROL (EXHAUST / EVAPORATIVE)
Manual Safety Symbols and Important Information
CS-303T
Throughout this manual and on the product itself, you will find safety alerts and helpful, informational
messages preceded by symbols or key words. The following is an explanation of those symbols and key
words and what they mean to you.
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.
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.
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.
The enclosed message provides information necessary for the protection of the unit.
Note: This enclosed message provides tips for use, care and maintenance of the unit.
CIRCLE AND SLASH SYMBOL
This symbol means the specific action shown is prohibited. Ignoring these prohibitions can result
in serious or fatal injury.
EMISSION CONTROL (EXHAUST / EVAPORATIVE)
EPA 2010 and Later and/or C.A.R.B. TIER III
The emission control system for the engine is EM (engine modification)
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 (evaporative emissions). Evaporative
emissions for California models are only applicable to fuel tanks.
An Emission Control Label is located on the engine. (This is an
EXAMPLE ONLY, information on label varies by engine FAMILY).
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
maintenance procedures are followed as listed in the Maintenance Section of this manual.
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CS-303T
DESCRIPTION
DESCRIPTION
Locate the safety decal(s) on your unit. Make sure the decal(s) is legible and that you understand and follow
the instructions on it. If a decal cannot be read, a new one can be ordered from your ECHO dealer. See
PARTS ORDERING instructions for specific information.
13
1
12
3
2
4
11
5
6
14
7
15
8
9
10
16
22
21
20
19
18
17
United States
Canada
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DESCRIPTION
CS-303T
1. Chain Brake Lever/Front hand guard - Guard between the front handle and the saw chain for
protecting the hand from injuries and aiding in control of the chain saw if the hand slips off the handle.
2. Air cleaner cover - Covers air cleaner.
3. Guide bar - The part that supports and guides the saw chain.
4. Tip guard - Anti-kickback device attached to the bar nose.
5. Saw chain - Chain, serving as a cutting tool.
6. Chain tension adjuster - Device to adjust chain tension.
7. Chain catcher - A projection designed to reduce the risk of the operator’s right hand from being hit by a
chain which has broken or derailed from the guide bar during cutting.
8. Chain Brake/Sprocket Guard - Protective cover for the chain brake, guide bar, saw chain, clutch, and
sprocket when the chain saw is in use.
9. Muffler Cover - Cover the muffler to protect operator from hot surface of muffler.
10. Safety Lanyard - If working off the ground the operator must be trained in safe climbing techniques and
use of all recommended safety equipment.
11. Control lever (choke/ignition switch) - Device for connecting and disconnecting the ignition system
and allowing the engine to be started or stopped. Lever also activates choke.
12. Throttle trigger lockout - A safety lever which must be depressed before the throttle trigger can be
activated. Prevents accidental operation of the throttle trigger.
13. Throttle lock button - Device for temporality setting the throttle in a partially open position to aid
starting.
14. Front support handle (for the left hand) - Support handle located at the front of the engine housing.
15. Throttle trigger - Device activated by the operator’s finger, for controlling the engine speed. Also
releases fast idle throttle latch when squeezed and released immediately after starting engine.
16. Throttle control handle (for the right hand) - Handle located above the engine housing.
17. Spark plug - Provides spark to ignite fuel mixture.
18. Oil tank cap - For closing the oil tank.
19. Starter handle - Pull handle slowly until starter engages then quickly and firmly. When engine starts,
return handle slowly. DO NOT let handle snap back or damage to unit will occur.
20. Fuel tank cap - For closing the fuel tank.
21. Choke control knob - Device for enriching the fuel/air mixture in the carburetor to aid cold starting. Also
activates fast idle throttle latch.
22. Purge pump - When starting engine, push purge pump 3 or 4 times.
CHAIN SAW TERMS
1. Fast Idle -Throttle setting that causes engine to operate at a faster speed for easier starting.
2. Throttle Latch - Device that sets idle speed to fast idle when choke control is operated.
3. Chain Brake - Stops the saw chain.
4. Drive Sprocket - Drives saw chain.
5. Clutch - Turns drive sprocket when engine rpm is fast enough to provide the power needed for cutting.
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CS-303T
DESCRIPTION
Preparation For Use
Saw chain is sharp! Always wear gloves when handling assembly, otherwise serious personal injury
may result.
Note: The machine may be delivered with guide bar, tip guard, and
For more information
saw chain separated. Install guide bar, tip guard, and saw
scan this QR code.
chain as follows.
Tip Guard to Bar Instructions
A
D
Tools Needed: Two 11 mm (7/16 in.) Wrenches. For saws with tip
guard P/N 2894901 and Symmetrical or Asymmetrical
Low-Kick type (Double Guard) guide bars.
1. Install bolt (A) in rear hole (B) of tip guard and through front
B
hole (C) in guide bar.
E
2. IMPORTANT: Dimple (D) in tip guard must engage recess (E)
C
in guide bar.
3. Securely tighten nut (F) and bolt (A).
F
Guide Bar and Saw Chain Installation/Removal
For more information
scan this QR code.
1. Release the cylinder cover latches, and remove the cylinder
cover.
2. Remove spark plug lead.
3. Remove sprocket guard nuts (A) and remove sprocket guard
(B).
4. Remove guide bar and saw chain if necessary.
Note: See “Maintenance and Care” section for guide bar/saw chain
maintenance procedures.
A
B
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DESCRIPTION
CS-303T
5. Unlock the chain brake, and mount guide bar on studs (C) and
slide toward sprocket (E) to make saw chain installation easier.
Install chain with cutters on top of guide bar facing forward.
C
E
F
D
A
B
6. Install the sprocket guard over the guide bar studs. Ensure
chain tension adjuster pin (F) fits into the guide bar adjuster
hole (D). Tighten sprocket guard nuts finger tight.
7. Adjust saw chain tension, as instructed in “Adjustment, Chain
Tension”.
Adjusting Chain Tension
For more information
scan this QR code.
Always loosen sprocket guard nuts before turning the chain tension
adjuster, otherwise the sprocket guard and tensioner will be
damaged.
1. Release the cylinder cover latches, and remove the cylinder
cover. Remove spark plug lead.
2. Loosen sprocket guard nuts.
3. Hold the bar nose up, and turn the adjuster screw (A) clockwise
until chain contacts underside of the bar.
4. Tighten nuts with the bar nose held up.
A
5. Pull the chain around the bar by hand. Loosen the adjustment if
you feel tight spots.
Tighten guide bar nuts to 20 to 23 N•m (175 to 200 in•lbf). DO
NOT over-tighten nuts. Damage to saw may result.
6. Assemble components in reverse order.
7. Keep chain properly tensioned at all times.
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CS-303T
OPERATION
Note: All chains require frequent adjustments.
OPERATION
Fuel
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.
Fuel Requirements
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. ECHO brand Power Fuel™ is 93 octane, ethanol-free fuel
premixed with ECHO Red Armor® engine oil at 50:1 ratio. Use of ECHO Power Fuel™ is recommended to
extend engine life in all air-cooled 2-stroke and 2/4-stroke hybrid engines.
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™ 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 certified oil, such as Echo premium Power Blend X™, will void the two-stroke engine warranty.
Echo premium Power Blend X™ 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.
Handling Fuel
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!
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OPERATION
CS-303T
• 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.
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.
For more information
scan this QR code.
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.
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.
Stored two-stroke fuel may separate. ALWAYS shake fuel container thoroughly before each use.
Chain Lubricant
Note: Cap indication - Fuel/oil tanks are indicated by the following illustrations
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CS-303T
OPERATION
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.
Fuel tank cap
Oil tank cap
• 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.
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 complete stop before removing obstructions, clearing debris, or servicing unit.
Engine exhaust IS HOT, and contains Carbon Monoxide (CO), a poison gas. Breathing CO can cause
unconsciousness, serious injury, or death. Exhaust can cause serious burns. ALWAYS position unit
so that exhaust is directed away from your face and body.
Operation of this equipment may create sparks that can start fires. This unit is equipped with a spark
arrestor to prevent discharge of hot particles from the engine. Metal cutters can also create sparks if
the cutter strikes rocks, metal, or other hard objects. Contact local fire authorities for laws or
regulations regarding fire prevention requirements.
Starting Cold Engine
For more information
scan this QR code.
Make sure the bar and chain are free from any obstruction
when starting the chain saw.
1. Move chain brake lever fully forward to lock chain brake
before starting.
2. Fill the fuel tank with fuel mixture. Do not over fill.
3. Fill the chain oil tank with lubricant. Do not over fill.
A
4. Lay unit on a flat, clear area and keep bar and chain clear of
all obstacles.
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OPERATION
CS-303T
5. Turn switch (A) to “RUN” position (I).
6. Pull choke (B) all the way out (close choke) position.
7. Push purge bulb (C) 10 times.
C
8. Pull starter handle several times until first starting sound is
heard. (Secure unit on ground with your knee or foot) (5-6
pulls maximum).
B
9. Push choke (B) all the way in (open choke) position.
10. Pull starter handle again.
Note: If engine does not start after 5 pulls, repeat instructions.
Note: Do not increase engine speed while chain brake is locked. Severe brake damage will result.
Starting Hard to Start Engine
Clutch engages and chain may rotate when engine is started
with throttle lock button engaged. Do not start engine before
chain brake is locked.
D
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.
A
3. Lay unit on a flat, clear area and keep bar and chain clear of
all obstacles.
4. Press throttle trigger 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. Move ignition switch (A) to “RUN” position.
7. Pull starter handle.
Note: Do not pull starter rope out to the maximum possible position.
Do not allow recoil handle to snap back against the casing.
• 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.
Note: Do not increase engine speed while chain brake is locked. Severe brake damage will result.
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CS-303T
OPERATION
Starting Warm Engine
Make sure the bar and chain are free from any obstruction
when starting the chain saw.
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 lock chain brake
before starting.
A
3. Lay unit on a flat, 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 first starting sound.
Note: If engine does not start after 5 pulls, use cold start procedure.
Note: Do not increase engine speed while chain brake is locked. Severe brake damage will result.
Running
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 and warm up
before using.
2. Move chain brake lever fully rearward to unlock chain brake.
3. Squeeze throttle control lockout then gradually squeeze throttle trigger to increase engine speed.
4. The chain starts moving when the engine reaches clutch engagement speed (see technical data page).
5. Confirm 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.
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OPERATION
Stopping
CS-303T
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 control knob 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
Checking Chain Tension
Chain tension should be checked frequently during work and
corrected as necessary.
Do not operate with a loose chain.
Chain Lubrication Test
Hold the chain just above a dry surface and open the throttle to
half speed for 30 seconds.
A thin line of “thrown” oil should be seen on the dry surface.
Cutting Instructions
For more information on
scan this QR code.
General
• This chain saw is designed for cutting wood or wood
products. Do not cut solid metal, sheet metal, plastic or
any non-wood materials.
• Read the ECHO “CHAIN SAW SAFETY MANUAL”
included with your chain saw for additional cutting and
safety instructions.
• Wear suitable hearing protection such as earmuffs or
earplugs to protect against objectionable or
uncomfortable loud noises.
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CS-303T
OPERATION
• 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
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 responses 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.
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OPERATION
CS-303T
Felling the Tree
For more information on
scan this QR code.
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 first
decide where that is!
3 m (10 feet)
Direction of fall
Retreat
45°
45°
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 and at least 3 m (10 feet)
from the trunk to avoid the trunk kicking back over the stump.
Not this way
Retreat
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. 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 5 cm (2 in.) 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 5 cm (2 in.)
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.
Direction of fall
Hinge
5 cm (2 in.)
First cut
Felling cut
Notch
Second cut
5 cm (2 in.)
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.
3
2
1
Limbing
Limbing a fallen tree is much the same as bucking.
Never stand on the tree that you are limbing. When limbing,
caution is the word. Be careful of the tip touching other limbs.
Always use both hands.
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CS-303T
OPERATION
Don’t cut with the saw overhead or aligned vertically with your
body. If the saw should kickback, you may not have enough
control to prevent possible injury.
Bucking
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.
Uphill position
• 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.
Finish cut
First cut
Support
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.
When the bar nose hits another tree, etc.
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OPERATION
CS-303T
Chain And Guide Bar Combination
The following combinations are recommended for model CS-303T.
Low Kickback Guide Bar
Low Kickback Saw Chain
Kick Guard
Echo P/N
Length
Bar P/N
Chain P/N
Links
45
Type
Pitch
Gauge
0.050
(OEM P/N)
91PX45CQ
91VG45CQ
12”
14”
12A0CD3745
14A0CD3752
2894901
28949
91PX
91VG
3/8”
91PX52CQ
91VG52CQ
52
Use of replacement saw chain and/or guide bar other than that specified, 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 ANSI B175.1 or CSA Z62.1, .3 Standard when tested
on the representative sample of chain saws below 3.8 C.I.D., and Echo guide bar specified.
Chain and guide bar gauge size must be identical. Use Bar/Chain combinations shown in table above.
If your tip guard is damaged or lost, contact your Echo dealer for a replacement. For the name of the Echo
Refer to your Chain Saw Safety Manual for tip guard application information.
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.
Saw Chain
(Low-kickback)
Do not use replacement saw chain unless it has been designated as meeting ANSI B175.1 or CSA
Z62.1, .3 kickback performance requirements, when tested on the representative sample of chain
saws below 3.8 c.i.d. specified in ANSI B175.1 or CSA 62.1, .3.
Note: LOW KICKBACK SAW CHAIN meets the kickback performance requirements of ANSI B175.1 or CSA
62.1, .3 (safety requirements for gasoline-powered chain saws).
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CS-303T
MAINTENANCE
MAINTENANCE
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 complete 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
3
REQ’D DAILYOR
YEARLY
600
HOURS
MAINTENANCE
PROCEDURE
EVERY
REFUEL
MONTHS
OR 90
HOURS
COMPONENT/SYSTEM
SKILL
BEFORE
USE
LEVEL
Air Filter
Inspect/Clean
1
1
1
1
1
1
1
I / C *
R *
Automatic Oiler
Oil Filter
Inspect/Adjust
I
Inspect/Replace
Inspect/Replace
Inspect/Replace
Replace
I
I / C *
Fuel System
I (1) *
I (1) *
Fuel Filter
I *
I *
I / R *
R *
Fuel Cap Gasket
Guide Bar & Sprocket Nose
Saw Chain
Inspect/Clean/Lubricate
I / C *
I *
I
Inspect/Sharpen/Replace/
Tensioning
2
Sprocket
Inspect/Replace
2
1
2
2
2
1
1
I *
Spark Plug
Inspect/Clean
I / C / R *
Cooling System
Muffler Spark Arrestor
Cylinder Exhaust Port
Recoil Starter Rope
Screws/Nuts/Bolts
Inspect/Clean
I / C
Inspect/Clean/Replace
Inspect/Clean/Decarbon
Inspect/Clean
I / C / R *
I / C
I / C *
I *
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:
(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.
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MAINTENANCE
CS-303T
Carburetor Adjustment
Every unit is run at the factory and the carburetor is set in
compliance with Emission Regulations. In addition, the
carburetor is equipped with “H” (High Speed) and “L” (Low
Speed) needle adjustment limiters that prevent settings
outside acceptable limits.
H
L
Engine Break-In
New engines must be operated a minimum duration of two
tanks of fuel break-in before carburetor adjustments can be
made. During the break-in period your engine performance
T
will increase and exhaust emissions will stabilize. Idle speed can be adjusted as required.
High Altitude Operation
This engine has been factory adjusted to maintain satisfactory starting, emission, and durability
performance up to 1,100 feet above sea level (ASL) (96.0 kPa). To maintain proper engine operation and
emission compliance above 1,100 feet ASL the carburetor may need to be adjusted by an authorized ECHO
service dealer.
If the engine is adjusted for operation above 1,100 feet ASL, the carburetor must be re-adjusted when
operating the engine below 1,100 feet ASL, otherwise severe engine damage may result.
1. Before adjusting carburetor clean or replace air filter and muffler “Spark Arrestor Screen”.
2. Make sure the bar and chain are properly adjusted.
3. Start engine and run several minutes to bring to operating temperature. Flash choke twice during
warm-up to clear any air from the fuel system.
4. Stop engine. Turn “H” speed needle counterclockwise (CCW) to stop. Turn “L” speed needle midway
between full clockwise (CW) stop and CCW stop.
5. Idle Speed Adjustment:
• Start engine, turn “Idle” speed adjustment screw “T” CW until the saw chain begins to move, then turn
screw out CCW until the saw chain stops moving. Turn screw out, CCW, an additional 1/4 turn.
When carburetor adjustment is completed, the saw chain should not move at idle, otherwise
serious personal injury may result.
6. Accelerate to full throttle for 2 - 3 seconds to clear any excess fuel in the engine, then return to idle.
Accelerate engine to full throttle to check for smooth transition from idle to high speed. If engine hesitates
turn “L” needle CCW 1/8 turn and repeat acceleration. Continue adjustment until smooth acceleration
results.
7. Check idle speed and reset if necessary as described in item 5. If a tachometer is available idle speed
should be set to value listed on technical data page.
When starting, idling adjustment speed should be adjusted to prevent the saw chain from moving.
When you experience trouble with the carburetor, contact your dealer.
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CS-303T
Air Filter
MAINTENANCE
1. Check periodically.
2. Close choke (Cold start position
). This prevents
dirt from entering the carburetor throat when the air
filter is removed. Brush accumulated dirt from air
cleaner area.
3. Remove air cleaner cover. Brush dirt from inside
cover.
4. Remove air filter and lightly brush debris from filter.
Replace filter if it is damaged, fuel soaked, very dirty,
or the rubber sealing edges are deformed.
5. Install air filter cover.
Spark Plug
• Check periodically.
• The standard spark gap is 0.65 mm (0.026 in.).
• Fastening torque:13 to 17 N•m (112 to 150 in•lbf).
0.65 mm (0.026 in.)
1. Remove air cleaner cover and remove spark plug.
2. Correct the spark gap if it is wider or narrower than the standard gap.
Check Fuel System
• Check before every use.
• After refueling, make sure fuel does not leak from around fuel pipe, fuel grommet or fuel tank cap.
• In case of fuel leakage there is a danger of fire. Stop using the machine immediately and request your
dealer to inspect or replace.
Fuel Filter
• Check periodically.
• Do not allow dust to enter fuel tank.
• A clogged filter will cause difficulty in starting engine or
abnormalities in engine performance.
1. Using a wire bent into the shape of a hook, pull
strainer out through gas port, and inspect strainer.
2. If the strainer is dirty, clean with suitable cleaning fluid.
3. When the inside of the fuel tank is dirty, rinsing the tank out with gasoline can clean it.
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MAINTENANCE
CS-303T
Note: Federal EPA regulations require all model year 2012 and later gasoline powered engines produced for
sale in the United States to be equipped with a special low permeation fuel supply hose between the
carburetor and fuel tank. When servicing model year 2012 and later equipment, only fuel supply
hoses certified by EPA can be used to replace the original equipment supply hose. Fines up to
$37,500 may be enforced for using an un-certified replacement part.
Automatic Oiler
• The discharge volume of the automatic oiler is adjusted
D
to approximately 4 mL/min at 7000 r/min, prior to
shipment from factory.
• Always check oil discharge when in use.
• Turn adjusting screw (D) counter-clockwise to increase
oil volume, clockwise to decrease oil volume.
• Do not turn the adjusting screw beyond the maximum or
minimum limit of volume adjustment.
Oil Filter
• Check periodically.
• Do not allow dust to enter into oil tank.
• Clogged oil strainer will affect the normal lubricating
system.
1. Using a wire bent into the shape of a hook, pull
strainer out through oil port and inspect strainer.
2. If the strainer is dirty, clean with suitable cleaning fluid.
3. If the inside of the oil tank is dirty, rinse with suitable cleaning fluid.
4. Install strainer into lower front of oil tank to ensure proper chain lubrication.
Guide Bar
1. Clean before using.
A
2. Clean the groove (A) of the guide bar with a small
screwdriver.
3. Clean oil holes (B) with a wire.
B
4. Invert guide bar periodically.
5. Clean the bar mount area before installing of the bar.
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CS-303T
Sprocket
MAINTENANCE
Worn: 0.5 mm (0.020 in.)
• A damaged sprocket will cause premature damage or
wear of saw chain.
• When the sprocket has worn out 0.5 mm (0.020 in.) or
more, replace it.
• Check sprocket when you install new chain. Replace it if
worn.
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.
Cooling System Cleaning
• Check periodically.
• Clogged fins will result in poor engine cooling.
1. Remove muffler and starter.
2. Use compressed air or wooden tool to remove dirt and dust
from between fins to let cooling air pass easily.
Spark Arrestor Muffler
• The spark arrestor muffler controls the exhaust noise and prevents hot, glowing particles of carbon from
leaving the muffler.
• Make sure the spark arrestor screen is in good repair and properly seated in the muffler.
• Certain internal combustion engines operated on forest, brush, and/or grass-covered areas in the states of
Washington, Oregon, Idaho, California, Minnesota, New Jersey and Maine, are required to be equipped
with a spark arrestor.
This requirement also applies to all U.S. Forest Service lands. In some of these areas, the spark arrestor
system must be certified per USDA Forest Service Regulation SAE J335.
Check with your local or state authorities for specific regulations in your area. Failure to follow these
requirements is a violation of the law.
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MAINTENANCE
CS-303T
Spark Arrestor Screen
Carbon deposits in muffler will cause a drop in engine output
and overheating. Spark arrestor screen must be checked
periodically.
1. 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.
Exhaust Port Cleaning
Level 2.
Parts Required: As needed: Muffler gasket
1. Remove spark plug lead.
2. Remove muffler cover.
3. Place piston at top dead center.
4. Remove muffler. Check parts for wear or damage, and replace
if necessary.
5. Use a wood or plastic scraping tool to clean deposits from cylinder exhaust port.
Never use a metal tool to scrape carbon from the exhaust port. Do not scratch the cylinder or piston when
cleaning the exhaust port. Do not allow carbon particles to enter the cylinder.
6. Install muffler. Tighten bolts to 9-11 N•m (80-95 in•lbf).
7. Connect spark plug lead.
8. Start engine, and allow unit to warm up at idle for several minutes.
9. Stop engine, and re-tighten mounting nuts to 9-11 N•m (80-95 in•lbf).
10. Install muffler cover.
11. Start engine and check for exhaust leaks between muffler and cylinder head. Stop engine if leak is
found and correct problem before operating chain saw.
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CS-303T
MAINTENANCE
Setting The Saw Chain
Preset tie strap
Left hand cutter
Top plate
Side plate
Depth gauge
Drive link
Tie strap
Guard link
Right hand cutter
For more information
scan this QR code.
Important points for proper maintenance of saw chain:
• Keep the cutters sharp at all times.
• Keep the left and the right cutters properly aligned.
• Note that blunt or irregular cutters will result in poor cutting
performance, increased vibration of chains and premature
breakage of the saw chain.
Sharpen lower edge
• Drive link serves to remove sawdust from the groove of the
guide bar. Keep the lower edge of the drive link sharp where
indicated.
Setting Saw Chain
• For setting saw chain, round file (4.0 mm dia. 5/32 in.) and flat
file are used.
30°
• Push file as shown.
Keep this angle
• To keep correct position and correct angle, use a file holder.
• Hold the file horizontally.
90°
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MAINTENANCE
CS-303T
• Place the depth gauge tool firmly on guidebar so that depth
gauge protrudes. Then file top of depth gauge with the flat file
until flat with top of the depth gauge tool.
1/5
• One fifth of the file diameter remains above cutter edge.
• Be sure to round off the front edge of the depth gauge.
Depth gauge tool
• Properly filed cutters are shown in illustration.
• When setting of the chain is finished, soak it in oil and wash
away filings completely before using.
80°
• When chain has been filed on the bar, supply sufficient oil to it,
move 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.
30°
Top plate filing angle
Side plate angle
• If the saw chain becomes soiled with resin, for instance, clean
it with kerosene and soak in it oil.
0.64 mm (0.025 in.)
To sharpen other chains, follow chain manufacturer’s
instructions.
Parallel
Depth gauge
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CS-303T
TROUBLESHOOTING
TROUBLESHOOTING
ENGINE PROBLEM TROUBLESHOOTING CHART
Problem
Check
Status
Cause
Remedy
Fuel strainer clogged
Fuel line clogged
Carburetor
Clean or replace
Clean or replace
See your Echo dealer
Fuel at carburetor No fuel at carburetor
No fuel at cylinder
Carburetor
See your Echo dealer
Open choke
Fuel at cylinder
Clean/replace air filter
Adjust carburetor
See your Echo dealer
Muffler wet with fuel
Fuel Mixture too rich
Enginecranks-
starts hard/
doesn’t start
Stop switch off
Electrical problem
Interlock switch
Turn switch to ON
See your Echo dealer
See your Echo dealer
Spark at end of
No spark
plug wire
Spark gap incorrect
Covered with carbon
Fouled with fuel
Plug defective
Adjust to .65mm (0.026 in.)
Clean or replace
Clean or replace
Replace plug
Spark at plug
No spark
Air filter
Air filter dirty
Normal wear
Clean or replace
Contaminants/residues
in fuel
Fuel filter
Fuel filter dirty
Replace
Contaminants/residues
in fuel
Engine runs,
but dies or
does not
accelerate
properly
Fuel vent
Fuel vent plugged
Clean or replace
Spark Plug
Carburetor
Plug dirty/worn
Normal wear
Vibration
Clean and adjust or replace
Adjust
Improper adjustment
Cooling system
dirty/plugged
Extended operation in
dirty/dusty locations
Cooling System
Clean
Spark Arrestor
Screen
Spark arrestor screen
plugged
Normal wear
Replace
Engine does
not crank
N/A
N/A
Internal engine problem See your Echo dealer
Fuel vapors are extremely flammable and may cause fire and/or explosion. Never test for ignition
spark by grounding spark plug near cylinder plug hole, otherwise serious personal injury may
result.
X7503207802
35
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STORAGE
CS-303T
STORAGE
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 completely. Press purge bulb 6 - 7 times to remove remaining fuel from carburetor then
drain the tank again. Close choke, start and run the engine until it stops due to lack of fuel.
• Allow engine to cool then remove the spark plug and pour 7 cc (1/4 oz.) of fresh, clean, two-stroke engine
oil into the cylinder through the spark plug hole.
• Store in a dry area, free from dust.
Do not store in an enclosure where fuel fumes may accumulate or reach an open flame or spark.
Do not lend or rent your chain saw without the Instruction manual and Safety manual.
Note:
• For future reference, you should keep this Instruction manual and the Safety manual.
• If this Instruction manual or the Safety manual has become illegible or is lost, please contact your ECHO
36
X7503207802
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CS-303T
TECHNICAL DATA
TECHNICAL DATA
Model
CS-303T
Length
260 mm (10.2 in.)
Width
235 mm (9.3 in.)
Height
220 mm (8.7 in.)
Dry weight
Engine
3.5 kg (7.7 lb.) Without chain and guide bar
Air-cooled two-stroke single cylinder
3
Displacement
Bore
30.1 cm (1.84 cu. in.)
37.0 mm (1.46 in.)
28.0 mm (1.10 in.)
7.58 : 1
Stroke
Compressions ratio
Carburetor
Spark plug
Fuel tank capacity
Diaphragm type
NGK BPM8Y
250mL (8.5 US. fl. oz.)
50 : 1 ratio with ECHO Power Blend X™, ISO-L-EGD (ISO/CD 13738) and JASO
M345-FD two-stroke, air-cooled engine oil.
Fuel
Use 89 octane unleaded. Do not use fuel containing methyl alcohol, more than 10 %
ethyl alcohol or 15 % MTBE. Do not use alternative fuels such as E-15 or E-85.
Gasoline
Oiling system
Chain oil capacity
Starter system
Clutch
Adjustable automatic oiler
150 mL (5.1 US. fl. oz.)
Automatic rewind starter
Centrifugal type
Sprocket type
Chain brake
Spur type, 6-tooth, 3/8 in. pitch
Manual and non-manual band brake type
3,000 RPM
Idle speed
Clutch engagement speed
4,400 RPM
Wide open throttle speed
(W.O.T.)
11,500 RPM
Chain tensioner
Guide bar
Side access system
12, 14 in
Saw chain
91PX/91VG
Top handle, Front hand guard, Anti-vibration device, Throttle control lockout, Chain
catcher, Spark arrestor muffler
Standard features
Kickback safety features
Double Guard Low Kick Guide Bar, Low Kick Guard Link Saw Chain, Front Hand
Guard/Chain Brake Lever, Kick Guard
* Technical data subject to change without notice.
X7503207802
37
© 08/2013 ECHO Inc.
Download from Www.Somanuals.com. All Manuals Search And Download.
WARRANTY STATEMENTS
CS-303T
WARRANTY STATEMENTS
ECHO LIMITED WARRANTY STATEMENT FOR
PRODUCT SOLD IN USA AND CANADA BEGINNING 01/01/2010
ECHO'S RESPONSIBILITY
ECHO Incorporated’s Limited Warranty, provides to the original purchaser that this ECHO product is free from defects in material and workmanship.
Under normal use and maintenance from date of purchase, ECHO agrees to repair or replace at ECHO’s discretion, any defective product
free of charge at any authorized ECHO servicing dealer within listed below application time periods, limitations and exclusions. THIS LIMITED
WARRANTY IS ONLYAPPLICABLE TO ECHO PRODUCTS SOLD BYAUTHORIZED ECHO DEALERS. IT IS EXTENDED TO THE ORIGINAL
PURCHASER ONLY, AND IS NOT TRANSFERABLE TO SUBSEQUENT OWNERS EXCEPT FOR EMISSION RELATED PARTS. Repair
parts and accessories replaced under this warranty are warranted only for the balance of the original unit or accessory warranty period. Any
damage caused by improper installation or improper maintenance is not covered by this warranty. All parts or products replaced under warranty
become the property of ECHO, Inc. This warranty is separate from the Emission control warranty statement supplied with your new product.
Please consult the Emission Control Warranty Statement for details regarding emission related parts. For a list of Authorized ECHO Dealers
refer to WWW.ECHO-USA.COM or call 1-800-432-ECHO.
OWNER’S RESPONSIBILITY
To ensure trouble free warranty coverage it is important that you register your ECHO equipment on-line at WWW.ECHO-USA.COMꢀRUꢀE\ꢀ¿OO-
LQJꢀRXWꢀWKHꢀZDUUDQW\ꢀUHJLVWUDWLRQꢀFDUGꢀVXSSOLHGꢀZLWKꢀ\RXUꢀXQLWꢁꢀ5HJLVWHULQJꢀ\RXUꢀSURGXFWꢀFRQ¿UPVꢀ\RXUꢀZDUUDQW\ꢀFRYHUDJHꢀDQGꢀSURYLGHVꢀDꢀGLUHFWꢀ
OLQNꢀLIꢀZHꢀ¿QGꢀLWꢀQHFHVVDU\ꢀWRꢀFRQWDFWꢀ\RXꢁ
The owner shall demonstrate reasonable care and use, and follow preventative maintenance, storage, fuel and oil usage as prescribed in the
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dealer for warranty repairs (within the applicable warranty period), and arrange for pick-up or return of your unit after the repairs have been
made. For your nearest authorized ECHO servicing dealer, call ECHO’s Dealer Referral Center, at 1-800-432-ECHO or you can locate an ECHO
servicing dealer at WWW.ECHO-USA.COM. Should you require assistance or have questions concerning ECHO’s Warranty Statement, you
can contact our Consumer Product Support Department at 1-800-673-1558 or contact us through the web at WWW.ECHO-USA.COM.
PRODUCT WARRANTY PERIOD
RESIDENTIAL APPLICATION
ꢀꢀ 5 YEAR WARRANTY - All units for residential, or non-income producing use will be covered by this limited warranty for ¿YH ꢀꢁꢂꢃ\HDUV from
date of purchase.
EXCEPTIONS:
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are warranted for the OLIHꢄ of the product on parts only.
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producing use will be covered for failures due to defects in material or workmanship for a period of ꢅꢆꢃGD\V from original product
purchase date. Any misuse from contact with concrete, rocks, or other structures is not covered by this warranty.
ꢀꢀ (&+2¶Vꢀ5DSLGꢀ/RDGHUꢀ6WULQJꢀ+HDGꢀFDUULHVꢀDꢀOLIHWLPHꢀZDUUDQW\ꢀRQꢀWKHꢀOLQHꢀORFNLQJꢀV\VWHPꢂꢀSDUWVꢀRQO\ꢄꢀQRꢀODERUꢁꢀ5HIHUꢀWRꢀ\RXUꢀRSHUDWRU¶Vꢀ
manual for string head installation and maintenance instructions.
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COMMERCIAL APPLICATION
ꢀꢀ 1 YEAR WARRANTY - All Chain Saws, QuikVent Saws, and Cut-Off Saws for commercial, institutional, agricultural, industrial, or income
producing use will be covered by this limited warranty for one ꢀꢇꢂꢃ\HDU from the date of purchase.
ꢀꢀ 2 YEAR WARRANTY - All other units for commercial, institutional, agricultural, industrial, or income producing use will be covered by this
limited warranty for two ꢀꢈꢂꢃ\HDUV from the date of purchase.
EXCEPTIONS:
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are warranted for the OLIHꢄ of the product on parts only.
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agricultural, industrial, rental, or income producing will be covered for failures due to defects in material or workmanship for a period
of ꢉꢆꢃGD\V from original product purchase date. Any misuse from contact with concrete, rocks, or other structures is not covered by
this warranty.
ꢀꢀ (&+2¶Vꢀ5DSLGꢀ/RDGHUꢀ6WULQJꢀ+HDGꢀFDUULHVꢀDꢀOLIHWLPHꢀZDUUDQW\ꢀRQꢀWKHꢀOLQHꢀORFNLQJꢀV\VWHPꢂꢀSDUWVꢀRQO\ꢄꢀQRꢀODERUꢁꢀ5HIHUꢀWRꢀ\RXUꢀRSHUDWRU¶Vꢀ
manual for string head installation and maintenance instructions.
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GHVLJQHGꢀWRꢀ¿Wꢁ
RENTAL APPLICATION - 90 DAYS WARRANTY
ꢀꢀ8QLWVꢀIRUꢀUHQWDOꢀXVHꢀZLOOꢀEHꢀFRYHUHGꢀDJDLQVWꢀGHIHFWVꢀLQꢀPDWHULDOꢀDQGꢀZRUNPDQVKLSꢀIRUꢀDꢀSHULRGꢀRIꢀꢅꢆꢀGD\VꢀIURPꢀWKHꢀGDWHꢀRIꢀSXUFKDVHꢁꢀ
ꢄꢀꢀ (&+2¶VꢀOLDELOLW\ꢀXQGHUꢀWKHꢀ³/LIHWLPH´ꢀFRYHUDJHꢀLVꢀOLPLWHGꢀWRꢀIXUQLVKLQJꢀSDUWVꢀVSHFL¿HGꢀXQGHUꢀWKHꢀ352'8&7ꢀ:$55$17<ꢀ3(5,2' section of
this warranty statement for ³/LIH´ꢀIUHHꢀRIꢀFKDUJHꢀIRUꢀDꢀSHULRGꢀRIꢀWHQꢀꢇꢈꢆꢉꢀ\HDUVꢀDIWHUꢀWKHꢀGDWHꢀRIꢀWKHꢀFRPSOHWHꢀXQLW¶Vꢀ¿QDOꢀSURGXFWLRQꢁꢀ
38
X7503207802
© 08/2013 ECHO Inc.
Download from Www.Somanuals.com. All Manuals Search And Download.
CS-303T
WARRANTY STATEMENTS
PURCHASED REPAIR PARTS, SHORT BLOCKS AND ACCESSORIES
ꢀꢀꢅꢆꢃGD\ꢀUHVLGHQWLDOꢂꢀRUꢀQRQꢃLQFRPHꢀSURGXFLQJꢀZDUUDQW\
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ATTENTION TWO-STROKE ENGINE POWER PRODUCT OWNERS
This ECHO two-stroke engine power product is a quality-engineered unit which has been manufactured to exact tolerances to provide superior
performance. To help ensure the performance of the unit, it is required to use two-stroke oil which meets the ISO-L-EGD Standard per ISO/CD
13738 and JASO M345FD Standards. (&+2ꢃ3RZHUꢃ%OHQGꢃ7ZRꢊ6WURNHꢃ2LO LVꢀDꢀSUHPLXPꢀWZRꢃVWURNHꢀRLOꢀVSHFL¿FDOO\ꢀIRUPXODWHGꢀWRꢀPHHWꢀ,62ꢃ
L-EGD (ISO/CD 13738) and JASO M345FD Standards. The use of two-stroke oils designed for other applications, such as for outboard motors
or lawnmowers can result in severe engine damage, and will void your two-stroke engine limited warranty.
THIS WARRANTY DOES NOT COVER DAMAGE CAUSED BY:
ꢀ
/DFNꢀRIꢀOXEULFDWLRQꢀRUꢀHQJLQHꢀIDLOXUHꢂꢀGXHꢀWRꢀWKHꢀXVHꢀRIꢀWZRꢃVWURNHꢀRLOVꢀthat do not meet the ISO-L-EGD (ISO/CD 13738) and JASO M345FD
Standards. Engine problems due to inadequate lubrication caused by failure to use an ISO-L-EGD compliant and JASO M345FD registered
oil, will void the two-stroke engine limited warranty. (&+2ꢀ3RZHUꢀ%OHQGꢀ7ZRꢃ6WURNHꢀ2LO meets the ISO-L-EGD and JASO M345FD
Standard. Emission related parts are covered for 5 years residential use or 2 years commercial use regardless of two-stroke oil used, per
the statement listed in the EPA or California Emission Defect Warranty Explanation.
'DPDJHꢀFDXVHGꢀE\ꢀXVHꢀRIꢀJDVRKROꢂꢀFRQWDLQLQJꢀPHWKDQROꢀꢇZRRGꢀDOFRKROꢉꢂꢀRUꢀJDVROLQHꢀFRQWDLQLQJꢀOHVVꢀWKDQꢀꢋꢅꢀRFWDQH. Only use gasoline which
contains ꢋꢅꢀRFWDQHꢀRUꢀKLJKHU. Gasohol which contains a PD[LPXPꢀꢈꢆꢌꢀHWKDQROꢀꢇJUDLQꢀDOFRKROꢉꢀRUꢀꢈꢍꢌꢀ07%(ꢀꢇPHWK\OꢎWHUWLDU\ꢎEXW\OꢎHWKHUꢉꢀ
is also approved. The prescribed mixing ratio of gasoline to oil is listed on the ECHO oil label and covered in your operator’s manual.
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engine speeds as listed in your operator’s manual.
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of unauthorized attachments.
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manual. Preventative maintenance as outlined in the operators manual is the customer’s responsibility.
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warranty period.
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Manuals.
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screen.
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with recommended grease or oil change intervals.
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failure occur, the product should not be used, but delivered as is to an authorized ECHO servicing dealer.
It is a dealer’s and/or customer’s responsibility to complete and return the warranty registration card supplied with your ECHO product or by visiting
WWW.ECHO-USA.COMꢁꢀ<RXUꢀUHFHLSWꢀRIꢀSXUFKDVHꢀLQFOXGLQJꢀGDWHꢂꢀPRGHOꢀDQGꢀVHULDOꢀQXPEHUꢀPXVWꢀEHꢀPDLQWDLQHGꢀDQGꢀSUHVHQWHGꢀWRꢀDQꢀDXWKRUL]HGꢀ
ECHO servicing dealer for warranty service. Proof of purchase rests solely with the customer. Some states do not allow limitations on how long
an implied warranty lasts, so the above limitations may not apply to you. Some states do not allow the exclusion or limitation of incidental or
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Incorporated, 400 Oakwood Rd., Lake Zurich, IL 60047.
DISCLAIMER OF IMPLIED WARRANTIES
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11/18/2011
X7503207802
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© 08/2013 ECHO Inc.
Download from Www.Somanuals.com. All Manuals Search And Download.
CS-303T
NOTES
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© 08/2013 ECHO Inc.
Download from Www.Somanuals.com. All Manuals Search And Download.
NOTES
CS-303T
42
X7503207802
© 08/2013 ECHO Inc.
Download from Www.Somanuals.com. All Manuals Search And Download.
CS-303T
SERVICING INFORMATION
SERVICING INFORMATION
Parts/Serial Number
Genuine ECHO Parts and ECHO REPOWER™ Parts and
Assemblies for 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 (3246). Dealer information is also available on our Web Site. When presenting your
unit for Warranty service/repairs, proof of purchase is required.
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 Consumer Product Support Department at 1-800-673-1558 from 8:30 am to
4:30 pm (Central Standard Time) Monday through Friday. Before calling, please know the model and serial
number of your unit.
Warranty Registration
To ensure trouble free warranty coverage it is important that you register your ECHO equipment on-line at
product confirms your warranty coverage and provides a direct link between you and ECHO if we find it
necessary to contact you.
Additional or Replacement Manuals
For more information
Replacement Operator, Safety Manuals, and Parts Catalogs
or by contacting ECHO Inc., 400 Oakwood Road, Lake Zurich,
IL 60047 (800-673-1558). Always check the ECHO Web Site for
updated information.
scan this QR code.
Safety Videos are available from your Echo dealer. A $5.00 shipping charge will be required for each video.
X7503207802
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© 08/2013 ECHO Inc.
Download from Www.Somanuals.com. All Manuals Search And Download.
C26111001001/C26111999999
C26012001001/C26012999999
ECHO, INCORPORATED
400 Oakwood Road
Lake Zurich, IL 60047
44
Download from Www.Somanuals.com. All Manuals Search And Download.
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