CS-370 Operator's Manual
x7722271404 / x772000164
CS-370
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-370
TABLE OF CONTENTS
Table of Contents .................................................................................................................................................................. 2
Packing List ........................................................................................................................................................................... 3
Safety..................................................................................................................................................................................... 4
Rules For Safe Operation ............................................................................................................................................... 4
Correct Use Of Chain Brake ........................................................................................................................................... 5
Personal Condition and Safety Equipment ..................................................................................................................... 8
Symbols and Signs ....................................................................................................................................................... 11
Manual Safety Symbols and Important Information...................................................................................................... 12
Emission Control (Exhaust / Evaporative) ........................................................................................................................... 12
EPA 2010 and Later and/or C.A.R.B. TIER III .............................................................................................................. 12
Description ........................................................................................................................................................................... 13
Preparation For Use ..................................................................................................................................................... 15
Operation ............................................................................................................................................................................. 17
Fuel............................................................................................................................................................................... 17
Chain Lubricant ............................................................................................................................................................ 19
Winter Operation .......................................................................................................................................................... 20
Starting Cold Engine..................................................................................................................................................... 20
Starting Hard to Start Engine........................................................................................................................................ 21
Starting Warm Engine .................................................................................................................................................. 22
Running ........................................................................................................................................................................ 22
Stopping ....................................................................................................................................................................... 23
Checking Chain Tension .............................................................................................................................................. 23
Chain Lubrication Test.................................................................................................................................................. 23
Cutting Instructions ....................................................................................................................................................... 23
Chain And Guide Bar Combination............................................................................................................................... 27
Guide Bar ..................................................................................................................................................................... 27
Saw Chain .................................................................................................................................................................... 27
Maintenance ........................................................................................................................................................................ 28
Skill Levels.................................................................................................................................................................... 28
Maintenance Intervals .................................................................................................................................................. 28
Carburetor Adjustment ................................................................................................................................................. 29
Air Filter ........................................................................................................................................................................ 30
Spark Plug .................................................................................................................................................................... 30
Check Fuel System ...................................................................................................................................................... 30
Fuel Filter...................................................................................................................................................................... 30
Automatic Oiler ............................................................................................................................................................. 31
Oil Filter ........................................................................................................................................................................ 31
Guide Bar ..................................................................................................................................................................... 31
Sprocket ....................................................................................................................................................................... 31
Cooling System Cleaning ............................................................................................................................................. 32
Spark Arrestor Muffler................................................................................................................................................... 32
Spark Arrestor Screen .................................................................................................................................................. 32
Exhaust Port Cleaning .................................................................................................................................................. 33
Setting The Saw Chain ................................................................................................................................................. 33
Troubleshooting ................................................................................................................................................................... 36
Storage ................................................................................................................................................................................ 37
Storage After Use ......................................................................................................................................................... 37
Technical Data ..................................................................................................................................................................... 38
Warranty Statements ........................................................................................................................................................... 39
Product Registration ............................................................................................................................................................ 41
Notes ................................................................................................................................................................................... 42
Servicing Information ........................................................................................................................................................... 43
Parts/Serial Number ..................................................................................................................................................... 43
Service.......................................................................................................................................................................... 43
Echo Consumer Product Support ................................................................................................................................. 43
Product Registration ..................................................................................................................................................... 43
Additional or Replacement Manuals ............................................................................................................................. 43
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PACKING LIST
PACKING LIST
The ECHO product you purchased has been factory pre-assembled for your convenience. Due to packaging
restrictions, some assembly may be necessary.
After opening the carton, check for damage. Immediately notify your retailer or ECHO Dealer of damaged or
missing parts. Use the contents list to check for missing parts.
_____ 1 - Power Head
_____ 1 - Instruction manual
_____ 1 - Safety Manual
_____ 1 - Emission Control Warranty Statement
_____ 1 - Echo Power Blend X™ 2-Stroke Oil Sample
_____ 1 - Guide bar
_____ 1 - Saw chain
_____ 1 - Tip Guard Assembly
_____
Assembly Tool(s) (If necessary)
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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.
The tip guard device is not installed on the guide bar when you
purchase your 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
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
1. With a basic understanding of kickback, you can reduce or
eliminate the element of surprise. Sudden surprise
contributes to accidents.
Kickback Danger Zone
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.
6. Follow manufacturer’s sharpening and maintenance
instructions for the saw chain.
Kickback
7. Only use replacement bars and chains specified by the
manufacturer or the equivalent.
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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
• Start the engine on a solid level surface and run at a fast idle
until warm.
Unlocked
• 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 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.
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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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 35 cm (14
in.) above a wooden surface. Right hand should hold the
rear handle, and left hand should hold the front handle.
35 cm
(14 in.)
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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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. A spark arrestor muffler approved to SAE Standard J335 is standard on this chain saw 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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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 or CE requirements must be worn whenever you operate the
unit.
• For additional safety, a full-face shield may be worn over safety glasses or goggles to provide
protection from sharp branches or flying debris.
Hand Protection
Wear sturdy, no-slip, rubber work gloves to improve your grip on the handles. Gloves also provide protection
against cuts and scratches, cold environments, and reduce the transmission of machine vibration to your
hands.
Hearing/Ear Protection
ECHO recommends wearing hearing protection whenever unit is used.
Breathing Protection
Operators who are sensitive to dust or other common airborne allergens may need to wear a dust mask to
prevent inhaling these materials while operating unit. Dust masks can provide protection against dust, plant
debris, and other plant matter such as pollen. Make sure the mask does not impair your vision, and replace
the mask as needed to prevent air restrictions.
Proper Clothing
Wear snug-fitting, durable clothing:
• Pants should have long legs, shirts should have 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.
• Keep clothing buttoned or zipped, and keep shirt tails tucked in.
Wear sturdy work shoes with nonskid rubber soles:
• DO NOT WEAR OPEN TOED SHOES.
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• DO NOT OPERATE UNIT BAREFOOTED.
Keep long hair away from engine and air intake. Retain hair with cap or net.
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.
The 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 this
machine by anyone who has a pacemaker.
Extended Operation / Extreme Conditions
Prolonged exposure to cold and/or vibration may result in injury. Read and follow all safety and
operation instructions to minimize risk of injury. Failure to follow instructions may result in painful
wrist/hand/arm injuries.
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.
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Repetitive Stress Injuries (RSI)
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.
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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SAFETY
Symbols and Signs
Symbol form/shape
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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
Contact of the guide bar tip with
any object should be avoided
Chain Oiler Adjustment
Both of the operator’s hands must
be used to operate the chain saw
Purge Pump
Hot Surface
Carburetor Adjustment Low Speed Mixture
Chain Brake Operation
Carburetor Adjustment High Speed Mixture
Emergency Stop
Carburetor Adjustment Idle Speed
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EMISSION CONTROL (EXHAUST / EVAPORATIVE)
CS-370
Manual Safety Symbols and Important Information
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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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.
1
14
13
12
2
11
10
3
9
8
7
6 5
4
15
16
17
18
25
24
23
22
United States
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20
19
Canada
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DESCRIPTION
CS-370
1. CHAIN BRAKE LEVER / FRONT HAND GUARD - Locks and unlocks the chain brake to stop or allow saw
chain rotation. Guard between the front handle and the saw chain helps protect the hand from injuries if the
hand slips off the handle.
2. SPARK ARRESTOR MUFFLER OR SPARK ARRESTOR MUFFLER WITH CATALYST - The muffler or
catalytic muffler controls exhaust noise and emission. The spark arrestor screen prevents hot, glowing
particles of carbon from leaving the muffler. Keep exhaust area clear of flammable debris.
3. TIP GUARD - Anti-kickback device attached to the bar nose.
4. SAW CHAIN - Chain, serving as a cutting tool.
5. GUIDE BAR - The part that supports and guides the saw chain.
6. SPIKED BUMPER - Device, fitted in front of the guide bar mounting point, acting as a pivot when in contact
with a tree or log.
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 TENSION ADJUSTER - Device to adjust chain tension.
9. CHAIN BRAKE / SPROCKET GUARD - Protective cover for the chain brake, guide bar, saw chain, clutch,
and sprocket when the chain saw is in use.
10. REAR HAND GUARD - Extension on the lower part of the rear handle for protecting the hand from the chain
if it breaks or derails.
11. CHOKE CONTROL KNOB - Device for enriching the fuel/air mixture in the carburetor to aid cold starting.
Also activates fast idle throttle latch.
12. PURGE PUMP - When starting engine, push purge pump 3 or 4 times.
13. AIR CLEANER COVER - Covers air filter.
14. CLEANER COVER KNOB - Device for installing the air cleaner cover.
15. SPARK PLUG - Provides spark to ignite fuel mixture.
16. IGNITION SWITCH - Device for connecting and disconnecting the ignition system and thus allowing the
engine to be started or stopped.
17. THROTTLE TRIGGER LOCKOUT - A safety lever which must be depressed before the throttle trigger can be
activated. Prevents accidental operation of the throttle trigger.
18. REAR HANDLE - FOR THE RIGHT HAND - Support handle located towards the rear of the engine housing.
19. 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.
20. THROTTLE LOCK BUTTON - Device for temporarily setting the throttle in a partially open position to aid
starting.
21. FUEL TANK CAP - For sealing the fuel tank.
22. 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.
23. OIL TANK CAP - For sealing the oil tank.
24. FRONT HANDLE - FOR THE LEFT HAND - Support handle located at the front of the engine housing.
25. CYLINDER COVER - The cooling airflow grill. It covers the cylinder, spark plug and silencer.
CHAIN SAW TERMS
1. CHAIN BRAKE - Stops the saw chain.
2. DRIVE SPROCKET - Drives saw chain.
3. CLUTCH - Turns drive sprocket when engine rpm is fast enough to provide the power needed for cutting.
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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
saw chain separated. Install guide bar, tip guard, and saw
chain as follows.
For more information
scan this QR code.
Tip Guard to Bar Instructions
A
D
Tools Needed: Two 11 mm (7/16 in.) Wrenches. For saws with tip
guard P/N 2893201 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
hole (C) in guide bar.
B
E
2. IMPORTANT: Dimple (D) in tip guard must engage recess (E)
in guide bar.
C
3. Securely tighten nut (F) and bolt (A).
F
Guide Bar and Saw Chain Installation/Removal
For more information
scan this QR code.
Note: Align the brake connector (B) of the sprocket guard to the
groove on the side of the brake lever (Front hand guard).
1. Remove air cleaner cover and disconnect spark plug lead.
2. Move the chain brake lever (A) (Front hand guard) fully
REARWARD (UNLOCK chain brake) to remove or install the
sprocket guard (C).
3. Remove sprocket guard nuts (D) and remove sprocket guard
(C).
A
4. Remove guide bar and saw chain if necessary.
Note: See “Maintenance and Care” section for guide bar/saw chain
maintenance procedures.
B
C
D
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DESCRIPTION
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5. Mount guide bar on studs (E) and slide toward sprocket (F) to
make saw chain installation easier. Install saw chain around
sprocket and guide bar as shown, with cutters on top of guide
bar facing forward.
E
G
F
H
D
C
J
B
6. Install sprocket guard over guide bar studs. Ensure chain
tension adjuster pin (H) fits into the guide bar adjuster hole (G),
brake band (J) is positioned around clutch drum. Tighten
sprocket guard nuts finger tight.
7. Turn saw over, and check brake band (J) for correct position on
clutch drum. If brake band is not in place around drum, remove
sprocket guard, and reinstall. Tighten sprocket guard nuts
finger tight.
8. Adjust saw chain tension, as instructed in “Adjustment, Chain
Tension”.
J
Improper sprocket guard 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 guard. Do not use
saw if chain brake does not function properly.
Adjusting Chain Tension
Always loosen sprocket guard nuts before turning the chain tension
adjuster, otherwise the sprocket guard and tensioner will be
damaged.
For more information
scan this QR code.
Unlock chain brake
1. Remove air cleaner cover and disconnect spark plug lead.
2. Loosen sprocket guard nuts.
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OPERATION
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.
5. Pull the chain around the bar by hand. Loosen the adjustment if
you feel tight spots.
Tighten guide bar nuts to 20 - 23 N•m (175 - 200 in•lbf). DO NOT
over-tighten nuts. Damage to saw may result.
A
6. Assemble components in reverse order.
7. Keep chain properly tensioned at all times.
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.
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OPERATION
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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. M345-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!
• 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 3 m (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
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OPERATION
• 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
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 high quality bar and chain oil.
• Use bar and chain oil of the following grades:
• SAE No. 30....in summer
Fuel tank cap
Oil tank cap
• 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.
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OPERATION
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Winter Operation
Air cleaner cover - Use the winter plug (A) to prevent carburetor
trouble in winter.
A
• Remove air cleaner cover. Remove plug from warm weather
position (B), and install into cold weather position (C).
Note: For operation at normal temperature (5° C [41° F]) return
the plug to its original position. To prevent over heating of
the engine.
Starting Cold Engine
C
B
For more information
scan this QR code.
Make sure the bar and chain are free from any obstruction
when starting the chain saw.
Chain brake
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.
A
3. Fill the chain oil tank with lubricant. Do not over fill.
4. Move ignition switch (A) to “RUN” position.
5. Push purge pump (B) 3 to 4 times or until fuel is visible in
purge pump.
6. Pull choke control knob all the way OUT (CLOSED [
choke position).
]
B
7. Securely hold the chain saw and pull starter handle several
times until first starting sound.
8. Push choke control knob all the way in.
9. Pull starter handle to start the engine.
Note: Do not pull starter rope out to the maximum possible
position.
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OPERATION
Do not allow recoil handle to snap back against the
casing.
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
Make sure the bar and chain are free from any obstruction
when starting the chain saw.
Chain brake
1. Move chain brake lever fully FORWARD to LOCK chain brake
before starting.
2. Press throttle trigger lockout (B) down while grasping throttle
trigger and push in throttle lock button (C).
3. Move ignition switch (A) to “RUN” position.
4. Securely hold the chain saw as shown and pull starter
handle.
5. When engine starts, immediately squeeze and then release throttle trigger, to release throttle lock
button.
• After starting the engine, immediately squeeze and then
release throttle trigger to release throttle lock button,
otherwise severe brake damage may occur.
A
C
• Never use throttle lock button for cutting.
• Use the throttle lock button only in starting.
B
• The chain will attempt to move when engine is started with
throttle lock button engaged.
• Do not start engine before chain brake is locked.
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OPERATION
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Starting Warm Engine
Make sure the bar and chain are free from any obstruction
when starting the chain saw.
Chain brake
1. Move chain brake lever fully FORWARD to LOCK chain brake
before starting.
2. Confirm there is fuel and chain oil in the tanks.
3. Move ignition switch to “RUN” position.
4. Securely hold the chain saw as shown and pull starter
handle.
5. Choke may be used if necessary, but after first starting
sound, squeeze throttle trigger to release choke and return
engine to idle.
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
Unlock Chain brake
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 trigger (B) gradually and increase engine
speed.
4. The chain starts running when the engine reaches clutch
engagement speed (see technical data page).
A
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.
22
B
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OPERATION
Stopping
1. Release throttle trigger and allow engine to idle.
2. Move ignition switch (A) DOWN to “STOP” position.
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.
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
General
For more information on
scan this QR code.
• This chain saw is designed for cutting wood. Do not cut
metal, plastic or any non-wood material.
• Read the “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!
Kickback
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OPERATION
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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
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.
Felling The Tree
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!
For more information on
scan this QR code.
3 m (10 feet)
Direction of fall
Retreat
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.
24
45°
Retreat
Not this way
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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.
OPERATION
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
1
2
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.
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.
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OPERATION
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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
Chain And Guide Bar Combination
The following combinations are recommended for model CS-370.
Guide Bar
Length mm (in.)
ECHO Part No.
Low-kickback
Saw Chain
Pitch mm (in.)
Type
Links
356 (14)
14A0CD3752
9.53 (3/8)
91PX / 91VG
52
406 (16)
16A0CD3757
9.53 (3/8)
91PX / 91VG
57
457 (18)
18A0CD3762
9.53 (3/8)
91PX / 91VG
62
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
dealer nearest you, Call: 1-800-432-ECHO (3246) or on the web at www.echo-usa.com.
Refer to your Chain Saw Safety Manual for 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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MAINTENANCE
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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
COMPONENT/SYSTEM
MAINTENANCE
PROCEDURE
REQ’D
SKILL
LEVEL
DAILY OR
BEFORE
USE
EVERY
REFUEL
3
MONTHS
OR 90
HOURS
YEARLY
600
HOURS
Air Filter
Inspect/Clean
1
I/C*
R*
Automatic Oiler
Inspect/Adjust
1
I
Oil Filter
Inspect/Replace
1
I
Fuel System
Inspect/Replace
1
I (1) *
Fuel Filter
Inspect/Replace
1
I*
I/R*
Fuel Cap Gasket
Replace
1
I*
R*
Guide Bar & Sprocket Nose
Inspect/Clean/Lubricate
1
I/C*
Saw Chain
Inspect/Sharpen/Replace/
Tensioning
2
I*
Sprocket
Inspect/Replace
2
I*
Spark Plug
Inspect/Clean
1
Cooling System
Inspect/Clean
2
Muffler Spark Arrestor
Inspect/Clean/Replace
2
I/C/R*
Cylinder Exhaust Port
Inspect/Clean/Decarbon
2
I/C
Recoil Starter Rope
Inspect/Clean
1
I/C*
Screws/Nuts/Bolts
Inspect/Tighten/Replace
1
I*
I/C*
I (1) *
I
I/C/R*
I/C
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
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.
Engine Break-In
T
L
H
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
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 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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MAINTENANCE
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Air Filter
A
1. Check before every use.
2. CLOSE choke (
).
3. Remove air cleaner cover (A) and air filter (B).
4. Lightly brush dust off air filter, or clean with
compressed air, or replace the air filter.
5. Install air filter and cover.
B
Spark Plug
• Check periodically.
• The standard spark gap is 0.65 mm (0.026 in.).
• Fastening torque: 15 - 17 N•m (130 - 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 (A) will cause difficulty in starting engine
or abnormalities in engine performance.
B
1. Using a wire bent into the shape of a hook, pull filter
out through gas port, and inspect filter.
2. When the filter is dirty, replace it.
A
3. When the inside of the fuel tank is dirty, rinse the tank
out with gasoline to clean it.
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.
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Automatic Oiler
A
• The discharge volume of the automatic oiler is adjusted
to approximately 4 mL/min at 7000 r/min, prior to
shipment from factory.
Decrease
Increase
• Always check oil discharge when in use.
• Turn adjusting screw (A) counterclockwise 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.
• A clogged oil filter (B) will affect the normal lubricating
system.
B
1. Using a wire bent into the shape of a hook, pull filter
out through oil port, and inspect filter.
A
2. If the filter is dirty, wash it in gasoline or replace it.
3. When the inside of the tank gets dirty, rinse the tank
out with gasoline to clean it.
Guide Bar
A
1. Clean before using.
B
2. Clean the groove (A) of the guide bar with a small
screwdriver.
3. Clean oil holes (B) with a wire.
4. Invert guide bar periodically.
5. Clean the bar mount area before installing of the bar.
Sprocket
• A damaged sprocket will cause premature damage or
wear of saw chain.
Worn: 0.5 mm (0.020 in.)
• When the sprocket has worn 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.
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MAINTENANCE
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Cooling System Cleaning
Cylinder fins
• Check periodically.
• Clogged fins will result in poor engine cooling.
1. Remove air cleaner cover, cylinder cover, 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.
Spark Arrestor Screen
A
Carbon deposits in muffler will cause drop in engine output and
overheating. Spark arrestor screen must be checked
periodically.
1. Remove air cleaner cover and remove spark plug lead.
2. Remove spark arrestor cover (C) and screen (B) from
muffler (A) body.
B
C
3. Clean carbon deposits from muffler components.
4. Replace screen if it is cracked, or has holes burned through.
5. Assemble components in reverse order.
Note: When cleaning carbon deposit, be careful not to damage the catalytic element inside muffler.
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Exhaust Port Cleaning
Level 2.
Parts Required:
As needed: Muffler gasket
1. Remove air cleaner cover and remove spark plug lead.
2. Remove engine 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 muffler mounting bolts (or nuts) to
8-11 N•m (70-95 in•lbf).
7. Install engine cover and attach spark plug lead.
8. Replace air cleaner cover.
9. Start engine, and allow unit to warm up at idle for several minutes.
10. Stop engine, and re-tighten mounting bolts (or nuts) to 8-11 N•m (70-95 in•lbf).
11. Install guide bar and chain. Adjust chain tension.
12. 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.
Setting The Saw Chain
Preset tie strap
Drive link
Left hand cutter
Top plate
Tie strap
Side plate
Guard link
Depth gauge
Right hand cutter
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MAINTENANCE
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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 [5/32 in.] diam.) 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°
• Place the depth gauge tool firmly on guide bar 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.
34
Depth gauge tool
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MAINTENANCE
• 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.
55°
• 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,
30°
the saw chain and the guide bar will be damaged prematurely. 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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TROUBLESHOOTING
CS-370
TROUBLESHOOTING
ENGINE PROBLEM TROUBLESHOOTING CHART
Problem
Check
Remedy
Fuel strainer clogged
Fuel line clogged
Carburetor
Clean or replace
Clean or replace
See your Echo dealer
No fuel at cylinder
Carburetor
See your Echo dealer
Muffler wet with fuel
Fuel Mixture too rich
OPEN choke 
Clean/replace air filter
Adjust carburetor 
See your Echo dealer
No spark
Stop switch OFF 
Electrical problem
Interlock switch
Turn switch to ON 
See your Echo dealer 
See your Echo dealer
Spark at plug
No spark
Spark gap incorrect

Covered with carbon 
Fouled with fuel
Plug defective
Adjust to 0.65mm
(0.026 in.)
Clean or replace 
Clean or replace 
Replace plug
Air filter
Air filter dirty
Normal wear
Clean or replace
Fuel filter
Fuel filter dirty
Contaminants/residues
in fuel
Replace
Fuel vent
Fuel vent plugged
Contaminants/residues
in fuel
Clean or replace
Spark Plug
Plug dirty/worn
Normal wear
Clean and adjust or replace
Carburetor
Improper adjustment
Vibration
Adjust
Cooling System
Cooling system
dirty/plugged
Extended operation in
dirty/dusty locations
Clean
Spark Arrestor
Screen
Spark arrestor screen
plugged
Normal wear
Replace
N/A
N/A
Internal engine problem
See your Echo dealer
Fuel at cylinder
Engine cranks starts hard/ 
doesn’t start
Spark at end of
plug wire
Engine does
not crank
Cause
No fuel at carburetor
Fuel at carburetor
Engine runs, 
but dies or 
does not
accelerate
properly
Status
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.
36
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STORAGE
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
dealer, or go to www.echo-usa.com.
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TECHNICAL DATA
CS-370
TECHNICAL DATA
Model
CS-370
Length
393 mm (15.5 in.)
Width with aluminum handle,
245 mm (9.6 in.)
Width with plastic handle
243mm (9.56 in)
Height
277 mm (10.9 in.)
Dry weight
4.6 kg (10.1 lb.) Without chain and guide bar
Engine
Air-cooled two-stroke single cylinder
Displacement
36.3 mL (2.213 cu. in.)
Bore
38.0 mm (1.496 in.)
Stroke
32.0 mm (1.259 in.)
Compressions ratio
7.3:1
Carburetor
Diaphragm type
Spark plug
NGK BPM8Y (Gap 0.65 mm [0.026 in.])
Fuel tank capacity
410 mL (13.9 US. fl. oz.)
Fuel
50 : 1 ratio with ECHO Power Blend X™ or ECHO Red Armor® ISO-L-EGD (ISO/CD
13738) and JASO M345-FD two-stroke, air-cooled engine oil.
Gasoline
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.
Oiling system
Adjustable automatic oiler
Chain oil capacity
280 mL (9.5 US. fl. oz.)
Starter system
Automatic rewind starter
Clutch
Centrifugal type
Sprocket type
Spur type, 6-tooth, 3/8 in. pitch
Chain brake
Automatic band brake type
Idle speed
2,650 RPM
Clutch engagement speed
4,050 RPM
Wide open throttle speed
(W.O.T.)
12,500 RPM
Chain tensioner
Side access system
Guide bar
14, 16, 18 in
Saw chain
91PX/91VG
Standard features
Front hand guard, Rear hand guard, Anti-vibration device, Spiked bumper, Throttle
control lockout, Chain catcher, Spark arrestor muffler, Tip guard
* Technical data subject to change without notice.
38
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WARRANTY STATEMENTS
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 ONLY APPLICABLE TO ECHO PRODUCTS SOLD BY AUTHORIZED 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.COMRUE\¿OOLQJRXWWKHZDUUDQW\UHJLVWUDWLRQFDUGVXSSOLHGZLWK\RXUXQLW5HJLVWHULQJ\RXUSURGXFWFRQ¿UPV\RXUZDUUDQW\FRYHUDJHDQGSURYLGHVDGLUHFW
OLQNLIZH¿QGLWQHFHVVDU\WRFRQWDFW\RX
The owner shall demonstrate reasonable care and use, and follow preventative maintenance, storage, fuel and oil usage as prescribed in the
RSHUDWRU¶VPDQXDO6KRXOGDSURGXFWGLI¿FXOW\RFFXU\RXPXVWDW\RXUH[SHQVHGHOLYHURUVKLS\RXU(&+2XQLWWRDQDXWKRUL]HG(&+2VHUYLFLQJ
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
HOMEOWNER APPLICATION
• 5 YEAR WARRANTY - All units for homeowner, or non-income producing use will be covered by this limited warranty for ¿YH \HDUV from
date of purchase.
EXCEPTIONS:
‡ )RUWZRVWURNHHQJLQHSRZHUHGSURGXFWVWKHHOHFWURQLFLJQLWLRQPRGXOHÀH[LEOHGULYHFDEOHV650VROLGGULYHVKDIWVDQG7&WLQHV
are warranted for the OLIH of the product on parts only.
• Cutting attachments such as, but not limited to, bars, chains, sprockets, blades, and nylon trimmer heads for homeowner or nonincome producing use will be covered for failures due to defects in material or workmanship for a period of GD\V from original
product purchase date. Any misuse from contact with concrete, rocks, or other structures is not covered by this warranty.
• ECHO’s Rapid Loader String Head carries a lifetime warranty on the line locking system, parts only; no labor. Refer to your operator’s
manual for string head installation and maintenance instructions.
• All SB-Series and PRO ATTACHMENT SERIES Split Shaft attachments carry the same warranty duration as the units they are
GHVLJQHGWR¿W
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 \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 \HDUV from the date of purchase.
EXCEPTIONS:
‡ )RUWZRVWURNHHQJLQHSRZHUHGSURGXFWVWKHHOHFWURQLFLJQLWLRQPRGXOHÀH[LEOHGULYHFDEOHV650VROLGGULYHVKDIWVDQG7&WLQHV
are warranted for the OLIH of the product on parts only.
• Cutting attachments such as, but not limited to, bars, chains, sprockets, blades, and nylon trimmer heads for commercial, institutional,
agricultural, industrial, rental, or income producing will be covered for failures due to defects in material or workmanship for a period
of GD\V from original product purchase date. Any misuse from contact with concrete, rocks, or other structures is not covered by
this warranty.
• ECHO’s Rapid Loader String Head carries a lifetime warranty on the line locking system, parts only; no labor. Refer to your operator’s
manual for string head installation and maintenance instructions.
• All SB-Series and PRO ATTACHMENT SERIES Split Shaft attachments carry the same warranty duration as the units they are
GHVLJQHGWR¿W
RENTAL APPLICATION - 90 DAYS WARRANTY
• Units for rental use will be covered against defects in material and workmanship for a period of 90 days from the date of purchase.
(&+2¶VOLDELOLW\XQGHUWKH³/LIHWLPH´FRYHUDJHLVOLPLWHGWRIXUQLVKLQJSDUWVVSHFL¿HGXQGHUWKHPRODUCT WARRANTY PERIOD section of
this warranty statement for ³/LIH´IUHHRIFKDUJHIRUDSHULRGRIWHQ\HDUVDIWHUWKHGDWHRIWKHFRPSOHWHXQLW¶V¿QDOSURGXFWLRQ
X7503254601
© 04/2015 ECHO Inc.
39
WARRANTY STATEMENTS
CS-370
ECHO does not offer an over the counter exchange program. Any ECHO product re-built other than by ECHO or sold through an unauthorized
dealer, or an unauthorized outlet store, is sold without ECHO’s limited warranty coverage. The ECHO Limited Warranty coverage is extended
to the original purchaser only, and is not transferable 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.
PURCHASED REPAIR PARTS, SHORT BLOCKS AND ACCESSORIES
• 90-day homeowner, or non-income producing warranty
• 30-day commercial, institutional, agricultural, industrial, income producing, or rental application warranty
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. (&+23RZHU%OHQGŒ7ZR6WURNH2LO LVDSUHPLXPWZRVWURNHRLOVSHFL¿FDOO\IRUPXODWHGWRPHHW,62
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:
•
Lack of lubrication or engine failure, due to the use of two-stroke oils that 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. ECHO Power Blend™ Two-Stroke Oil meets the ISO-L-EGD and JASO M345FD
Standard. Emission related parts are covered for 5 years homeowner 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.
•
Damage caused by use of gasohol, containing methanol (wood alcohol), or gasoline containing less than 89 octane. Only use gasoline which
contains 89 octane or higher. Gasohol which contains a PD[LPXP 10% ethanol (grain alcohol) or 15% MTBE (methyl/tertiary/butyl/ether)
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.
‡
(QJLQHGDPDJHFDXVHGE\XVHRIHWKHURUDQ\VWDUWLQJÀXLGV
‡
'DPDJHFDXVHGE\WDPSHULQJZLWKHQJLQHVSHHGJRYHUQRURUHPLVVLRQFRPSRQHQWVRUUXQQLQJHQJLQHVDERYHVSHFL¿HGDQGUHFRPPHQGHG
engine speeds as listed in your operator’s manual.
‡
2SHUDWLRQRIWKHXQLWZLWKLPSURSHUO\PDLQWDLQHGUHPRYHGFXWWLQJVKLHOGRUUHPRYHGGDPDJHGDLU¿OWHU
•
Damage caused by dirt, pressure or steam cleaning the unit, salt water, corrosion, rust, varnish, abrasives, and moisture.
‡
'HIHFWVPDOIXQFWLRQVRUIDLOXUHVUHVXOWLQJIURPDEXVHPLVXVHQHJOHFWPRGL¿FDWLRQVDOWHUDWLRQVQRUPDOZHDULPSURSHUVHUYLFLQJRUXVH
of unauthorized attachments.
•
Incorrect storage procedures, stale fuel, including failure to provide or perform required maintenance services as prescribed in the operator's
manual. Preventative maintenance as outlined in the operators manual is the customer’s responsibility.
•
Failures due to improper set-up, pre-delivery service or repair service by anyone other than authorized ECHO servicing dealer during the
warranty period.
•
Certain parts and other items are not warranted, including but not limited to: lubricants, starter cords, and engine tune-ups.
•
Use of spark plugs other than those meeting performance and durability requirements of the OEM spark plug listed in the Operator's
Manuals.
•
Overheating or carbon scoring failures due to restricted, clogged exhaust port or combustion chamber, including damage to spark arrester
screen.
‡
$GMXVWPHQWVDIWHUWKH¿UVWWKLUW\GD\VDQGEH\RQGVXFKDVFDUEXUHWRUDGMXVWPHQWDQGWKURWWOHFDEOHDGMXVWPHQW
•
Damage to gears or gear cases caused by contaminated grease or oil, use of incorrect type or viscosity of lubricants, and/or failure to comply
with recommended grease or oil change intervals.
•
Damage caused by loading SHRED 'N' VAC® beyond recommended capacity.
‡
'DPDJHFDXVHGE\SXPSRUVSUD\HUUXQQLQJGU\SXPSLQJRUVSUD\LQJFDXVWLFRUÀDPPDEOHPDWHULDOVRUODFNRIRUEURNHQVWUDLQHUV
•
Additional damage to parts or components due to continued use after operational problem or failure occurs. Should operational problem or
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.COM. Your receipt of purchase including date, model and serial number must be maintained and presented to an authorized
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
FRQVHTXHQWLDOGDPDJHVVR\RXPD\DOVRKDYHRWKHUVSHFL¿FOHJDOULJKWVZKLFKYDU\IURPVWDWHWRVWDWH7KLVOLPLWHGZDUUDQW\LVJLYHQE\(&+2
Incorporated, 400 Oakwood Rd., Lake Zurich, IL 60047.
DISCLAIMER OF IMPLIED WARRANTIES
This limited warranty is in lieu of all other expressed or implied warranties, including any warranty of FITNESS FOR A PARTICULAR PURPOSE
OR USE and any implied warranty of MERCHANTABILITYRWKHUZLVHDSSOLFDEOHWRWKLVSURGXFW(&+2DQGLWVDI¿OLDWHGFRPSDQLHVVKDOOQRWEH
OLDEOHIRUDQ\VSHFLDOLQFLGHQWDORUFRQVHTXHQWLDOGDPDJHLQFOXGLQJORVWSUR¿WV7KHUHDUHQRZDUUDQWLHVH[WHQGHGRWKHUWKDQDVSURYLGHGKHUHLQ
7KLVOLPLWHGZDUUDQW\PD\EHPRGL¿HGRQO\E\(&+2
99922201032
11/18/2011
40
X7503254601
© 04/2015 ECHO Inc.
CS-370
PRODUCT REGISTRATION
PRODUCT REGISTRATION
Thank you for choosing ECHO Power Equipment
Please go to http://www.echo-usa.com/Warranty/Register-Your-ECHO to register your new product on-line. It's FAST
and EASY! NOTE: your information will never be sold or misused by ECHO, Inc. Registering your purchase enables us
to contact you in the unlikely event of a service update or product recall, and verifies your ownership for warranty
consideration.
If you do not have access to the Internet, you can complete the form below and mail to:
ECHO Inc., Product Registration, PO Box 1139, Lake Zurich IL 60047.
X7503254601
© 04/2015 ECHO Inc.
41
NOTES
CS-370
NOTES
42
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CS-370
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 8:00 am to
5:00 pm (Central Standard Time) Monday through Friday. Before calling, please know the model and serial
number of your unit.
Product Registration
To ensure trouble free warranty coverage it is important that you register your ECHO equipment on-line at
www.echo-usa.com or by filling out the product registration sheet included in this manual. Registering your
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
Replacement Operator, Safety Manuals, and Parts Catalogs
are available from your ECHO dealer or at www.echo-usa.com
or by contacting ECHO Inc., 400 Oakwood Road, Lake Zurich,
IL 60047 (800-673-1558). Always check the ECHO Web Site for
updated information.
For more information
scan this QR code.
Safety Videos are available from your Echo dealer. A $5.00 shipping charge will be required for each video.
X7503254601
© 04/2015 ECHO Inc.
43
ECHO, INCORPORATED
44
400 Oakwood Road
Lake Zurich, IL 60047
www.echo-usa.com
C33514001001/C33514999999
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