Echo CS-355T User manual

Chain Saw
Instruction Manual
MODEL : CS-355T
WARNING
X7503320104
06/13
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.
The engine exhaust from this
product contains chemicals known
to the State of California to cause
cancer, birth defects or other
reproductive harm.
WARNING

2
CS-355T
Copyright© 2013 By Echo, Incorporated
All Rights Reserved.
CONTENTS
CONTENTS.............................................................................................................. 2
PACKING LIST......................................................................................................... 3
RULES FOR SAFE OPERATION ............................................................................ 4
KICKBACK SAFETY PRECAUTIONS FOR CHAIN SAW USERS.......................... 4
CORRECT USE OF CHAIN BRAKE........................................................................ 5
AUTOMATIC CHAIN BRAKE................................................................................... 6
Other Safety Precautions ......................................................................................... 6
OPERATOR SAFETY .............................................................................................. 8
SYMBOLS AND SIGNS ........................................................................................... 9
DECALS ................................................................................................................... 10
EMISSION DATA ..................................................................................................... 10
DESCRIPTION OF PARTS...................................................................................... 11
PREPARATION FOR USE....................................................................................... 13
FUEL AND LUBRICANT .......................................................................................... 15
OPERATION ............................................................................................................ 17
CUTTING INSTRUCTION........................................................................................ 20
CHAIN AND GUIDE BAR COMBINATION............................................................... 23
MAINTENANCE AND CARE.................................................................................... 24
Carburetor Adjustment......................................................................................... 25
High Altitude Operation........................................................................................ 25
SETTING THE SAW CHAIN .................................................................................... 29
TROUBLESHOOTING ............................................................................................. 31
STORAGE AFTER USE........................................................................................... 32
TECHNICAL DATA................................................................................................... 33
WARRANTY STATEMENTS.................................................................................... 34
SERVICING INFORMATION.................................................................................... 36
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.

3CS-355T
PACKING LIST
The ECHO product you purchased has been fac-
tory 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. Im-
mediately notify your retailer or ECHO dealer of
damaged or missing parts. Use the packing list to
check for missing parts.
Warranty registration card
Assembly Tool (s)
Instruction manual Safety manual
ECHO chain saw
Saw chain
Guide bar
Kick Guard®
Handle adaptor
(Select the handle adaptor that ts you the best)
Emission Control Warranty Statement

4
CS-355T
RULES FOR SAFE OPERATION
Kickback Safety Precautions for Chain Saw Users
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.
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, home-
owners, or chain saw novices. Most cutting operations
can be accomplished 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.
Linear kickback
Rotational kickback
Chain moving downward at impact
Rotational kickback
Reduced radius
belongs on top
Pinch
Kickback

5CS-355T
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 follows.
This model needs to use low-kickback chain and bar.
USA : ANSI Standard B175.1
Safety Requirement for 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.
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 start-
ing 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
• 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,
function of the brake may deteriorate. Always
keep the device clean.
• Do not increase engine speed while the chain
brake is locked.

6
CS-355T
End of the guide bar may be placed at the
height of about 55 cm (22 in.).
55 cm
(22 in.)
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.
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.
IMPORTANT
When checking the operation of the automatic
chain brake, use a soft surface substance like
wood to provide the impact so the chain is not
damaged.
Rear handle should be gripped lightly with the
right hand.
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.
Other Safety Precautions
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. When carrying a chain saw
with the engine running, push the front hand guard
forward to engage the chain brake.
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.

7CS-355T
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
Using improper replacement components or removing safety devices may result in serious or fatal injury.
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
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.
• 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.
WARNING
Check fuel system for leaks due to fuel tank damage, especially if the unit is dropped. If damage or
leaks are found, do not use unit, otherwise serious personal injury or property damage may occur. Have
unit repaired by an authorized servicing dealer before using.

8
CS-355T
OPERATOR SAFETY
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 your-
self to cold and vibration.
REPETITIVE STRESS INJURY
• It is believed that over-using the muscles and ten-
dons 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
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.
• Take periodic breaks to minimize repetition and rest
your hands.
• Reduce the speed and force in which you do the
repetitive 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 fol-
lowed, 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.
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.

9CS-355T
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
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.
NOTE
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.
SYMBOLS AND SIGNS
CIRCLE AND SLASH SYMBOL
This symbol means the specic action
shown is prohibited. Ignoring these
prohibitions can result in serious or
fatal injury.

10
CS-355T
DECALS
Locate this safety decal on your unit. The complete
unit illustration found in the “NOMENCLATURE OF
PARTS” section will help you locate them.
Make sure the decal is legible and that you under-
stand and follow the instructions on it. If a decal
cannot be read, a new one can be ordered from
your ECHO dealer.
REPLACEMENT BAR AND CHAIN
GUIDE BAR CHAIN
PART NO. PART NO.
12" 12A0ED3745 91PX45CQ
14" 14A0ED3752 91PX52CQ
16" 16A0ED3757 91PX57CQ
Note:
There may be other replacement
components for achieving kickback
protection. For details, please refer
to the chain and bar combination
sheet shown in the instruction
manual.
EMISSION DATA
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 en-
gine emissions output meets applicable emissions regulations, provided that approved maintenance 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 Informa-
tion label (sample below) is “C”, “K”, or “T”, the emis-
sion 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.

11 CS-355T
DESCRIPTION OF PARTS
19
14
15
17
16
2
1
21
22
20
23
18
13
5
4
7
11
12
3
10
6
89

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1. Instruction manual - Included with unit. Read be-
fore operation and keep for future reference to learn
proper, safe operating techniques.
2. Safety manual - Describe operating and safety
instructions for this chain saw.
3. Chain Brake lever/Front hand guard - Guard
between the front handle and the saw chain for pro-
tecting the hand from injuries and aiding in control
of the chain saw if the hand slips off the handle.
4. Rear handle (for the right hand) - Support handle
located on the top of the engine housing.
5. Mufer cover - Cover the mufer to protect opera-
tor from hot surface of mufer.
6. Chain Brake/Clutch cover - Protective cover for
the chain brake, guide bar, saw chain, clutch, and
sprocket when the chain saw is in use.
7. Chain tension adjuster - Device to adjust chain
tension.
8. 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.
9. Spiked bumper - Device, tted in front of the guide
bar mounting point, acting as a pivot when in con-
tact with a tree or log.
10. Guide bar - The part that supports and guides the
saw chain.
11. Saw chain - Chain, serving as a cutting tool.
12. Bar tip guard - Anti-kickback device attached on
the bar nose.
13. Fuel tank cap - For closing the fuel tank.
14. Oil tank cap - For closing the oil tank.
15. Starter handle - Pull handle slowly until starter en-
gages then quickly and rmly. When engine starts,
return handle slowly. Do not let handle snap back or
damage to unit will occur.
DESCRIPTION OF PARTS
16. Cleaner cover knob - Device for installing the air
cleaner cover.
17. Air cleaner cover - Covers air cleaner.
18 Purge pump - When starting engine, push purge
pump 3 or 4 times.
19. Throttle trigger - Device activated by the opera-
tor’s nger, for controlling the engine speed. Also
releases fast idle throttle latch when squeezed and
released immediately after starting engine.
20. Throttle trigger lockout - A safety lever which
must be depressed before the throttle trigger can
be activated. Prevents accidental operation of
the throttle trigger.
21. Control lever - Device for connecting and discon-
necting the ignition system and allowing the en-
gine to be started or stopped. Lever also activates
choke.
22. Front handle (for the left hand) - Support handle
located at the front of the engine housing.
23. Safety Lanyard - If working off the ground the op-
erator must be trained in safe climbing techniques
and use of all recommended safety equipment.
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.

13 CS-355T
PREPARATION FOR USE
WARNING
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 saw chain separated. Install guide bar, tip
guard, and saw chain as follows.
KICK GUARD®TO BAR INSTRUC-
TIONS
Tools Needed: Two 11 mm (7/16 in.) Wrenches.
For saws with Kick Guard®P/N 2894901 and Sym-
metrical Low-Kick type (Double Guard) guide bars.
1. Install bolt (A) in rear hole (B) of Kick Guard®and
through front hole (C) in guide bar.
2. IMPORTANT: Dimple (D) in Kick Guard®must engage
recess (E) in guide bar.
3. Tighten nut (F) and bolt (A) using 11 mm (7/16 in.)
wrenches until snug. Make certain Kick Guard® is ush
against guide bar.
4. Tighten nut (F) 1/8 additional turn.
5. Check to make certain Kick Guard®is tight on guide
bar.
GUIDE BAR AND SAW CHAIN INSTAL-
LATION/REMOVAL
NOTE
• Move the chain brake lever (Front hand guard) fully
rearward to remove or install the clutch cover to
chain saw.
• Align the brake connector of the clutch cover to the
groove on the side of the brake lever (Front hand
guard).
1. Remove spark plug cover and disconnect spark plug
lead.
2. Remove two clutch cover nuts and remove clutch
cover.
3. Remove bar and saw chain if necessary. See “Main-
tenance and Care” section for guide bar/saw chain
maintenance procedures.
(A)
(D)
(E)
(C)
(B)
(F)
Clutch cover
Brake lever
(Front hand guard)
Two nuts
Brake connector

14
CS-355T
4. Mount guide bar on studs and slide toward clutch to
make saw chain installation easier. Install chain with
cutters on top of guide bar facing forward.
5. Unlock the chain brake, and install the clutch cover
over the guide bar studs. Ensure chain tension adjust-
er pin ts into the guide bar adjuster hole, brake band
is positioned around clutch drum. Tighten clutch cover
nuts nger tight.
6. Turn saw over, and check brake band for correct
position on clutch drum. If brake band is not in place
around drum, remove cover, make sure brake is un-
locked, and reinstall. Tighten clutch cover nuts nger
tight.
WARNING
Improper clutch cover assembly can result in serious
injury, and will cause severe saw damage if unit is
started. Never start or operate saw if brake band is
not in place on clutch drum. Always check chain brake
operation after replacing cover. Do not use saw if chain
brake does not function properly.
ADJUSTING CHAIN TENSION
IMPORTANT
Always loosen clutch cover nuts before turning the
chain tension adjuster, otherwise the clutch cover and
tensioner will be damaged.
1. Remove spark plug cover and disconnect spark plug
lead.
2. Loosen two clutch cover nuts, if necessary.
3. Hold the bar nose up, and turn the adjuster screw
clockwise until chain contacts underside of the bar.
4. Tighten both nuts with the bar nose held up.
5. Pull the chain around the bar by hand. Loosen the
adjustment if you feel tight spots.
6. When chain is properly tensioned, tighten clutch cover
nuts securely -20 to 23 N·m (200 to 230 kgf·cm).
7. Keep chain properly tensioned at all times.
8. Connect spark plug lead and install spark plug cover.
Adjusting screw
Proper tension Improper tension
Unlock chain brake
Direction to tension the chain
Guide bar
adjuster hole
Clutch cover Nuts
Adjuster pin
Clutch Guide bar studs
Brake connector
Brake connector
NOTE
All chains require frequent adjustments.

15 CS-355T
Handling Fuel
WARNING
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 RUNNING!
• 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.
Fuel and lubricant
NOTE: 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 Stor-
age 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 XTM 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 XTM, will void the two-stroke engine warranty.
IMPORTANT
Echo premium Power Blend XTM Universal 2-Stroke Oil may be mixed at 50:1 ratio for application in all Echo
engines sold in the past regardless of ratio specied in those manuals.

16
CS-355T
IMPORTANT
Stored fuel ages. Do not mix more fuel than you ex-
pect 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.
Oil tank cap Fuel tank cap
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 emis-
sions. 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 pre-
caution, store fuel in an approved, airtight container. Store
in a well-ventilated, unoccupied building, away from sparks
and ames.
Cap indication
Fuel/oil tanks are indicated by the following
illustrations.
CHAIN LUBRICANT
Proper lubrication of the chain while in operation re-
duces friction between the chain and the guide bar to a
minimum and assures a longer service life.
• Use bar and chain oil of high quality for this purpose.
• Do not use used or reclaimed oil to avoid various
oiler problems.
• Use ECHO bar and chain oil.
• When ECHO bar and chain oil is not available:
Use motor oil, etc.
• Use bar and chain oil of the following grades:
SAE No. 30....... in summer
SAE No. 10....... in winter or when cutting resinous
trees.
• When refueling, also rell chain oil.
Fuel Mix Chart 50 : 1
US. METRIC
Gasoline Oil Gasoline Oil
Gallons US. . oz. L mL
1 2.6 4 80
2 5.2 8 160
5 12.8 20 400

17 CS-355T
OPERATION
Cold Start
Chain brake
Starter handle
Purge pump
Control lever
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.
CAUTION
• After starting the engine, immediately squeeze
and release throttle trigger to return engine to
idle.
• Never use partial throttle for cutting.
• Use the chain brake only in starting or in
emergencies.
WARNING
• After choke control knob is pulled and then knob
is returned to original position, throttle remains
slightly open (fast idle latch condition).
• The chain will attempt to move when engine is
started with fast idle throttle latch engaged.
• Do not start engine before chain brake is locked.

18
CS-355T
Cold Start
Chain brake
Starter handle
Purge pump
Control lever
Chain brake
Control lever
Run (I)
Purge pump
Control lever
Run (I)
WHEN THE ENGINE IS WARM
CAUTION
Make sure the bar and chain are free from any
obstruction when starting the chain saw.
• Move chain brake lever fully forward to lock chain
brake before starting.
• Conrm there is fuel and chain oil in the tanks.
• Move the control lever to “Run" (I) position.
• Securely hold the chain saw as shown and pull starter
handle.
• Choke may be used if necessary, but after rst ring
sound, squeeze throttle trigger to release choke and
return engine to idle.
WHEN THE ENGINE IS COLD
CAUTION
Make sure the bar and chain are free from any
obstruction when starting the chain saw.
• Move chain brake lever fully forward to lock chain
brake before starting.
• Fill the fuel tank with fuel mixture. Do not over ll.
• Fill the chain oil tank with lubricant. Do not over ll.
• Move the control lever (choke / ignition switch) forward
to “Cold Start” ( ) position.
• Push purge pump 3 to 4 times or until fuel is visible in
purge pump.
• Securely hold the chain saw as shown and pull starter
handle.
• Move the control lever to “Run" (I) position. If neces-
sary, restart engine.
NOTE
Do not increase engine speed while chain brake is
locked. Severe brake damage will result.
NOTE
If engine does not start after 5 pulls, repeat
instructions.
CAUTION
• After starting the engine, immediately squeeze
and then release throttle trigger to release fast
idle throttle latch, otherwise severe brake damage
may occur.
• Never use fast idle throttle latch for cutting.
• Use the fast idle throttle latch only in starting.

19 CS-355T
STOP
Control lever
Throttle trigger
Unlock chain brake
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.
• When engine starts, immediately squeeze and release
throttle trigger to release fast idle throttle latch, other-
wise severe brake damage will result.
•Keep idling for a few minutes.
• Set the brake lever in the unlocked position before
starting to cut.
• Squeeze throttle trigger gradually and increase revolu-
tion of the engine.
• The chain starts running when the engine reaches
4400 r/min approximately.
• Conrm proper acceleration and lubrication of chain
and bar.
• Do not run the engine at high speed unnecessarily.
• Be sure that saw chain stops moving when throttle
trigger is released.
STOPPING
• Release throttle trigger and allow engine to idle.
• Move the control lever to “STOP” position.
NOTE
If engine does not stop, move the control lever to
“Cold Start” ( ) position to stop engine.
Return the unit to your authorized ECHO dealer to
check and repair stop switch before starting the engine
again.
CHECKING CHAIN TENSION
•Chain tension should be checked frequently during
work and corrected as necessary.
CAUTION
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.

20
CS-355T
CUTTING INSTRUCTION
GENERAL
WARNING
• 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.
• 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!
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 tech-
niques 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
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 cut-
ting 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.
Kickback
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.