Chain Saw
Instruction Manual
MODEL : CS-370
WARNING
Read rules for safe operation and instructions carefully. ECHO provides an Instruc-
tion Manual and a Safety Manual. Both must be read and understood for proper and
safe operation.
X750012172
12/09
X7503251402
RULES FOR SAFE OPERATION
A. Kickback Safety Precautions for Chain Saw Users
WARNING!
KICKBACK may occur when the nose or
tip of the guide bar touches an object, or
when the wood closes in and pinches the
saw chain in the cut.
1.With a basic understanding of
kickback, you can reduce or eliminate
the element of surprise.
Sudden surprise contributes to
accidents.
Tip contact in some cases may cause a
lightning fast reverse REACTION, Kick-
ing 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 rap-
idly back towards the operator.
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
Either of these reactions may cause you to
lose control of the saw which could result
in serious personal injury.
firm grip will help you reduce kickback
and maintain control of the saw.
Don’t let go.
The Kick Guard® device is not installed
on the guide bar when you purchase your
ECHO chain saw.
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.
The Kick Guard® can be used in a majority
of cutting operations, and is especially rec-
ommended for beginners, homeowners, or
chain saw novices.
4.Cut at high engine speeds.
Most cutting operations can be accom-
plished with the Kick Guard® in place.
5.Do not overreach or cut above
shoulder height.
Do not rely exclusively upon the safety
devices built into your saw.
As a chain saw user, you should take sev-
eral steps to keep your cutting jobs free
from accident or injury.
6.Follow manufacturer’s sharpening and
maintenance instructions for the saw
chain.
7.Only use replacement bars and chains
specified by the manufacturer or the
equivalent.
Copyright© 2010 By Echo, Incorporated
All Rights Reserved.
CS-370
2
B. Other Safety Precautions
1.Do not operate a chain saw with
11.Shut off the engine before setting the
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.
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.
2.Do not operate a chain saw when you
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.
are fatigued.
3.Use safety footwear, snug-fitting
clothing and protective gloves.
Wear eye, hearing, and head
protection devices.
14.Keep the handles dry, clean, and free
of oil or fuel mixture.
4.Use caution when handling fuel.
Move the chain saw at least 3 m
(10 feet) from the fueling point before
starting the engine.
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.
5.Do not allow other persons to be near
the chain saw when starting or cutting
with the chain saw.
17.All chain saw service, other than
items listed in the Instruction manual
maintenance instructions, should
be performed by competent service
personnel.
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.
(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.)
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.
18.When transporting your chain saw, use
the appropriate guide bar scabbard.
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.
19.Spark arrestor mufflers approved to
SAE Standard J335 are standard
on ECHO chain saws to reduce the
possibility of forest fires.
Do not operate the chain saw with a
loose or defective muffler.
Do not remove the spark arrestor
screen.
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.
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WARNING
• During operation, the muffler or catalytic muffler and surrounding cover become hot.
• Never suspend the saw on a lanyard with the engine running.
• Always use the saw from the right-hand side of your body – NEVER from the left side.
• Always wear proper safety clothing to protect your lower body from sharp saw chain and
hot muffler.
• Always keep exhaust area clear of flammable debris during transportation or when storing,
otherwise serious property damage or personal injury may result.
WARNING
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.
WARNING
Using improper replacement components or removing safety devices may result in serious or fatal injury.
WARNING
Check fuel system for leaks due to fuel tank damage, especially if the unit is dropped. If damage or leaks are
found, do not use unit, otherwise serious personal injury or property damage may occur. Have unit repaired by an
authorized servicing dealer before using.
CS-370
4
CONTENTS
RULES FOR SAFE OPERATION............................................................................. 1
SYMBOLS AND SIGNS............................................................................................ 5
EMISSION DATA...................................................................................................... 7
PACKING LIST......................................................................................................... 7
NOMENCLATURE OF PARTS................................................................................. 8
OPERATOR SAFETY............................................................................................... 10
CORRECT USE OF CHAIN BRAKE........................................................................ 11
PREPARATION FOR USE ....................................................................................... 12
FUEL AND LUBRICANT........................................................................................... 14
OPERATION............................................................................................................. 16
CUTTING INSTRUCTION........................................................................................ 19
CHAIN AND GUIDE BAR COMBINATION............................................................... 24
MAINTENANCE AND CARE.................................................................................... 25
- Carburetor Adjustment ........................................................................................... 26
- High Altitude Operation ........................................................................................ 26
SETTING THE SAW CHAIN..................................................................................... 30
TROUBLESHOOTING ............................................................................................. 31
STORAGE AFTER USE........................................................................................... 33
TECHNICAL DATA ................................................................................................... 33
WARRANTY STATEMENTS .................................................................................... 34
SERVICING INFORMATION.................................................................................... 40
This chain saw is designed for cutting wood or wood products. Do not cut solid metal,
sheet metal, plastic or any non-wood materials.
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.
SYMBOLS AND SIGNS
DANGER
CIRCLE AND SLASH SYMBOL
This symbol means the specific action
shown is prohibited. Ignoring these
prohibitions can result in serious or
fatal injury.
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.
NOTE
WARNING
This enclosed message provides tips for use,
care and maintenance of the unit.
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.
IMPORTANT
The enclosed message provides information
necessary for the protection of the unit.
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.
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SYMBOL FORM
DECALS
Part Number X503-007041
Part Number X524-001640
REPLACEMENT BAR AND CHAIN
CS-370
GUIDE BAR*
PART NO.
CHAIN*
TYPE
LINKS
WARNING!! Read and follow all
safety precaution in the instruction
manual. Failure to follow
instructions could result in serious
personal injury.
14” 14A0CD3752 OREGON 91P / 91VG 52
16” 16A0CD3757 OREGON 91P / 91VG 57
18” 18A0CD3762 OREGON 91P / 91VG 62
*Or equivalent
Note: There may be other replace-
ment components for achieving
kickback protection. For details,
please refer to the chain and bar
combination sheet shown in the
instruction manual.
Part Number 890191-30131
TO AVOID KICKBACK
1. Hold the chain saw firmly with both
hands.
Locate these safety decals on your unit. The
complete unit illustration found in the “NOMEN-
CLATURE OF PARTS” section will help you locate
them.
2. Don’t let the nose of the guide bar
contact any obstruction.
3. Tip contact may suddenly move the
guide bar upward and backward,
which may cause serious injury.
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.
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EM IS S IO N DA T A
E M IS S IO N C O N T R O L (E x h A U S T & E v A P O R A T Iv E )
EPA 2010 and Later and/or C.A.R.B. TIER III
The emission control system for the engine is EM/TWC
(Engine Modification and 3-way Catalyst) and for the fuel
tank the Control System is EVAP (Evaporative Emissions)
or N (for nylon tank). Evaporative emission may be appli-
cable to California models only.
An Emission Control Label is located on the en-
gine. (This is an EXAMPLE ONLY, information on
label varies by engine FAMILY).
PRODUCT EMISSION DURABILITY (EMISSION COMPLIANCE PERIOD)
The 300 hour emission compliance period is the time span selected by the manufacturer certifying the
engine emissions output meets applicable emissions regulations, provided that approved maintenance
procedures are followed as listed in the Maintenance Section of this manual.
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.
ECHO chain saw
T-wrench
ECHO Power Blend X™
2-stroke oil sample
Instruction manual
Safety manual
Guide bar
Warranty registration
card
Kick Guard®
Saw chain
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NOMENCLATURE OF PARTS
4
3
5
6
1
7
26
15
8
9
2
10
11
12
13
14
X524-001640
890191-30131
X503-007041
25
24
16
17
23
18
19
20
22
21
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NOMENCLATURE OF PARTS
1. Instruction manual - Included with unit. Read be-
13. Guide bar - The part that supports and guides the
saw chain.
14. Saw chain - Chain, serving as a cutting tool.
15. Bar tip guard - Anti-kickback device attached on
the bar nose.
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. Front hand guard - Guard between the front handle
and the saw chain for protecting the hand from
injuries and aiding in control of the chain saw if the
hand slips off the handle.This guard is used to lock
the chain brake which is to stop the saw chain rota-
tion.
4. Cleaner cover knob - Device for installing the air
cleaner cover.
5. Air cleaner cover - Covers air filter.
6. Purge pump - When starting engine, push purge
pump 3 or 4 times.
7. Choke control knob - Device for enriching the fuel/
air mixture in the carburetor to aid cold starting.
8. Rear hand guard - Extension on the lower part of
the rear handle for protecting the hand from the
chain if it breaks or degrooves.
9. Clutch cover - Protective cover to the guide bar,
saw chain, clutch and sprocket when the chain saw
is in use.
10. Chain tension adjuster - Device to adjust chain
tension.
11. 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.
16. Cylinder cover - The cooling airflow grill. It covers
the cylinder, spark plug and silencer.
17. Front handle (for the left hand) - Support handle
located at the front of the engine housing.
18. Oil tank cap - For closing the oil tank.
19. Starter handle - Pull handle slowly until starter en-
gages then quickly and firmly. When engine starts,
return handle slowly. DO NOT let handle snap back
or damage to unit will occur.
20. Fuel tank cap - For closing the fuel tank.
21. Throttle latch - Device for temporality setting the
throttle in a partially open position to aid starting.
22. Throttle trigger - Device activated by the operator’s
finger, for controlling the engine speed.
23. Rear handle (for the right hand) - Support handle
located towards the rear of the engine housing.
24. Throttle trigger lockout - A safety lever which must
be depressed before the throttle trigger can be acti-
vated in order to prevent the accidental operation of
the throttle trigger.
25. Ignition switch - Device for connecting and discon-
necting the ignition system and thus allowing the
engine to be started or stopped.
26. Spark arrestor muffler or spark arrestor muffler
with catalyst -The muffler or catalytic muffler con-
trols exhaust noise and emission. The spark arres-
tor screen prevents hot, glowing particles of carbon
from leaving the muffler. Keep exhaust area clear of
12. Spiked bumper - Device, fitted in front of the guide
bar mounting point, acting as a pivot when in con-
tact with a tree or log.
flammable debris.
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OPERATOR SAFETY
VIBRATION AND COLD
EYE AND HEARING PROTECTION
• Wear eye protection goggles that meet ANSI
Z 87.1 requirements. Goggles meeting the require-
ments have the mark “Z 87” stamped on them.
• Wear hearing protection.
If this guideline is not followed, hearing loss can occur.
ECHO recommends wearing hearing protection
at all times.
• It is believed that a condition called Raynaud’s Phe-
nomenon, which affects the fingers 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 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 and neck,
feet and ankles and hands and wrists.
• Maintain good blood circulation by performing vigorous
arm exercises during frequent work breaks and also by
not smoking.
• Limit the number of hours of operation. Try to fill 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 fingers, followed by whitening and loss of feeling,
consult your physician before further exposing yourself
to cold and vibration.
WEAR PROPER CLOTHING
• Snug fitting durable clothing should be worn.Pants
should have long legs, DO NOT WEAR SHORTS.
Do not wear loose fitting clothing, scarves, neckties,
jewelry or any item that may become tangled in sur-
rounding 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. Retain
hair with cap or net.
REPETITIVE STRESS INJURY
• It is believed that over-using the muscles and tendons
of the finger, 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.
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 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.
To reduce the risk of RSI/CTS, do the following:
• Avoid using your wrist in a bent, extended or twisted
position.
• 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 seri-
ous property damage or personal injury may result.
• Take periodic breaks to minimize repetition and rest
your hands.
• Reduce the speed and force in which you do the repeti-
tive movement.
• Do exercises to strengthen hand and arm muscles.
• See a doctor if you feel tingling, numbness or pain in
your fingers, hands, wrists or arms. The sooner RSI/
CTS is diagnosed, the more likely permanent nerve and
muscle damage can be prevented.
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SPARK ARRESTOR MUFFLER
• The spark arrestor muffler controls the exhaust
noise and prevents hot, glowing particles of car-
bon 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 Regula-
tion SAE J335.
Check with your local or state authorities for spe-
cific regulations in your area.
Failure to follow these requirements is a violation
of the law.
CORRECT USE OF ChAIN BRAKE
Rotational kickback
DANGER
Kickback safety precaution for chain saw
users: 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.
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-
fices, your employer or your local dealer to ensure
that your chain saw conforms to the required safety
standard.
Reduced radius
belongs on top
ECHO chain brakes have been designed and
tested to comply with international safety standards
as follows.
USA
: ANSI Standard B175.1 - 2000
Safety Requirement for chain saws
Canada : CSA Standard Z 62.1 CHAIN SAWS
Rotational kickback
WARNING
ANSI Standard B175. 1 - 2000 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
maintaind in compliance with the Standard
B175. 1 - 2000.
Chain moving downward at impact
Liner kickback
Pinch
CS-370
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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
Kick Guard®
Tools Needed: Two 11 mm (7/16 in.) Wrenches.
For saws with Kick Guard® P/N 2893201 and
Symmetrical 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.
Guide bar
3. Tighten nut (F) and bolt (A) using 11 mm (7/16
in.) wrenches until snug. Make certain Kick
Guard® is flush against guide bar.
4. Tighten nut (F) 1/8 additional turn.
5. Check to make certain Kick Guard® is tight on
guide bar.
Brake lever
(Front hand guard)
GUIDE BAR AND SAW CHAIN IN-
STALLATION/REMOVAL
Brake connector
Clutch cover
NOTE
• Move the chain brake lever (Front hand guard)
fully rearward to remove or install the clutch
cover to chain saw.
Two nuts
• 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 lead. (See page 27)
2. Remove two clutch cover nuts and remove
clutch cover.
3. Remove bar and saw chain if necessary. See
“Maintenance and Care” section for guide bar/
saw chain maintenance procedures.
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Guide bar studs
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.
Guide bar
adjuster
5. Unlock the chain brake, and install the clutch cover over
the guide bar studs. Ensure chain tension adjuster pin fits
into the guide bar adjuster hole, brake band is positioned
around clutch drum. Tighten clutch cover nuts finger 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 unlocked, and reinstall.
Tighten clutch cover nuts finger tight.
Clutch
Nuts
Adjuster pin
Clutch cover
Brake connector
Brake band
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
Unlock chain brake
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 lead. (See page 25)
Direction to
tension the chain
2. Loosen two clutch cover nuts, if necessary.
3. Hold the bar nose up, and turn the adjuster screw clock-
wise 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 adjust-
ment if you feel tight spots.
6. Whenchainisproperlytensioned,tightenclutchcovernuts
securely - 20 to 23 N·m (200 to 230 kgf·cm).
7. Keep chain properly tensioned at all times.
Adjusting screw
NOTE
All chains require frequent adjustments.
Proper tension Improper tension
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FU E L A N D LU B R IC A N T
NOTICE: Use of unmixed, improperly mixed, or fuel older than 90 days, (stale fuel), may cause hard starting,
poor performance, or severe engine damage and void the product warranty. Read and follow instructions in the
Storage section of this manual.
F U E L S T A T E M E N T
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. FC/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. FC/FD certified 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 specified in those manuals.
Handling Fuel
WARNING
Fuel is VERY flammable. Use extreme care when mixing, storing or handling or serious personal injury may result.
• Use an approved fuel container.
• DO NOT smoke near fuel.
• DO NOT allow flames or sparks near fuel.
• Fuel tanks/cans may be under pressure. Always loosen fuel caps slowly allowing pressure to equalize.
• NEVER refuel a unit when the engine is HOT or RUNNING!
• DO NOT fill fuel tanks indoors. ALWAYS fill fuel tanks outdoors over bare ground.
• DO NOT overfill fuel tank. Wipe up spills immediately.
• Securely tighten fuel tank cap and close fuel container after refueling.
• Inspect for fuel leakage. If fuel leakage is found, do not start or operate unit until leakage is repaired.
• Move at least 3m (10 ft.) from refueling location before starting the engine.
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14
Fuel Mix Chart
50:1
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
IMPORTANT
• DO NOT store a unit with fuel in its tank. Leaks can occur.
Return unused fuel to an approved fuel storage container.
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.
Storage - Fuel storage laws vary by locality. Contact your lo-
cal government for the laws affecting your area. As a precau-
tion, store fuel in an approved, airtight container. Store in a
well-ventilated, unoccupied building, away from sparks and
flames.
IMPORTANT
Stored two-stroke fuel may separate. ALWAYS
shake fuel container thoroughly before each
use.
CHAIN LUBRICANT
Proper lubrication of the chain while in operation
reduces friction between the chain and the guide
bar to a minimum and assures a longer service life.
Cap indication
Fuel/oil tanks are indicated by the following
illustrations.
• Use bar and chain oil of high quality for this pur-
pose.
• 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
Fuel tank cap
Oil tank cap
SAE No. 10....... in winter or when cutting resin-
ous trees.
• When refueling, also refill chain oil.
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15
OPERATION
WARNING
Moving parts can amputate fingers or cause severe injuries. Keep hands, clothing and loose objects away from
all openings. Always stop engine, disconnect spark plug, and make sure all moving parts have come to a com-
plete stop before removing obstructions, clearing debris, or servicing unit.
WARNING
Engine exhaust IS HOT, and contains Carbon Monoxide (CO), a poison gas. Breathing CO can cause uncon-
sciousness, serious injury, or death. Exhaust can cause serious burns. ALWAYS position unit so that exhaust is
directed away from your face and body.
WARNING
Operation of this equipment may create sparks that can start fires around dry vegetation. This unit is equipped
with a spark arrestor and a spark arrestor may be required. The operator should contact local fire agencies for
laws or regulations relating to fire prevention requirements.
Chain brake
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.
Ignition switch
• Fill the fuel tank with fuel mixture.
It is not permitted to fill fuel above the shoulder level of
fuel tank.
Start / Run
• Fill the chain oil tank with lubricant. Do not over fill.
• Move ignition switch to “RUN” position.
• Push purge pump 3 to 4 times or until fuel is visible in
purge pump.
Purge pump
• Pull choke control knob all the way out. (Choke posi-
tion)
Choke control knob
NOTE
Choke
Do not pull starter rope out to the maximum pos-
sible position.
Do not allow recoil handle to snap back against the
casing.
• Securely hold the chain saw as shown and pull
starter handle several times until first firing sound.
• Push choke control knob all the way in.
• Pull starter handle to start the engine.
Starter handle
NOTE
If engine does not start after 5 pulls, repeat instruc-
tions.
CS-370
16
WHEN THE ENGINE IS HARD TO
START
Chain brake
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.
Ignition switch
Throttle trigger lockout
Start / Run
• Press throttle trigger lockout down while grasping
throttle trigger and push in throttle latch.
• Move ignition switch to “RUN” position.
• Securely hold the chain saw as shown and pull
starter handle.
• When engine starts, immediately squeeze throttle trig-
ger, to release throttle latch.
Push
Throttle latch
Throttle trigger
CAUTION
1. When using throttle latch for starting, keep the
brake in lock position.
2. After starting the engine, squeeze throttle
trigger slightly to release throttle latch.
3. Do not increase engine speed while chain brake
is locked.
Starter handle
CAUTION
The chain will attempt to rotate when engine is
started with throttle latch engaged. After engine
starts, release throttle trigger to idle engine,
otherwise brake damage may occur. Never use
throttle latch for cutting. Use it only when starting
the engine.
Chain brake
WHEN THE ENGINE IS WARM
• Move chain brake lever fully forward to lock chain
brake before starting.
• Confirm there is fuel and chain oil in the tanks.
• Move ignition switch to “RUN” position.
• Securely hold the chain saw as shown and pull
starter handle.
• Choke may be used if necessary, but be sure to push
it back on first firing sound.
Choke control knob
Open choke
NOTE
If engine does not start after 5 pulls, use cold start
procedure.
CS-370
17
RUNNING
Unlock chain brake
WARNING
The saw chain should not move at idle, otherwise serious
personal injury may result.
NOTE
If saw chain moves adjust carburetor according to “Car-
buretor Adjustment” instructions in this manual, or see
your dealer.
• When engine starts, keep idling for a few minutes.
• Set the brake lever in the unlocked position before starting
to cut.
• Pull throttle trigger gradually and increase revolution of the
engine.
• The chain starts running when the engine reaches 3800 r/
min approximately.
• Confirm 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.
Ignition switch
STOP
STOPPING
• Release throttle trigger and move ignition switch down to
“STOP” position.
Throttle trigger
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.
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.
CS-370
18
CUTTING INSTRUCTION
GENERAL
CAUTION
• 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 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 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 cut-
ting will actually be more difficult.
NOTE
Some material may adversely affect the housings of
your ECHO chain saw.
(Example: Palm Tree Acid, fertilizer, etc.) To avoid
housing deterioration, carefully remove all packed
saw dust around clutch and guide bar area and
wash with water. Coat metal parts with light oil.
Kickback
CS-370
19
FELLING THE TREE
3 m (10 feet)
45°
Retreat
Direction of fall
WARNING
A falling tree can seriously damage anything it may
hit - a car, a house, a fence, a power line, or another
tree. There are ways to make a tree fall where you
want it, so first decide where that is!
Retreat
Not this way
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-de-
gree angle and at least 3 m (10 feet) from the trunk to
avoid the trunk kicking back over the stump.
Direction of fall
Hinge
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 op-
posite 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.
5 cm (2 in.)
First cut
Felling cut
Notch
5 cm (2 in.)
Second cut
One-third tree diameter
When the tree starts to fall, kill the engine, place the saw
on the ground and make your retreat quickly.
To fell big trees with a diameter exceeding twice the bar
length, start the notching cuts from one side and draw
the saw through to the other side of the notch.
Start the back cut on one side of the tree, pivoting the
saw through to form the desired hinge on that side.
Then remove the saw for the second cut. Insert the saw
in the first cut, very carefully so as not to cause kick-
back. The final cut is made by drawing the saw forward
in the cut to reach the hinge.
3
2
1
CS-370
20
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 vertical-
ly with your body. If the saw should kickback, you
may not have enough control to prevent possible
injury.
BUCKING
Bucking is the sawing of a log or fallen tree into
smaller pieces.
There are a few basic rules which apply to all buck-
ing operations.
Keep both hands on the handles at all times. Sup-
port 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.
Uphill position
If you make the cut with the tree on the ground,
don’t let the saw’s chain dig into the earth; it is
harmful for the saw, and you stand a good chance
of being struck by flying debris.
To cut the trunk, use the bucking and two-cut
sequence shown.
The first cut should be no deeper than one-third
the trunk diameter.
Finish cut
First cut
WARNING
KICKBACK IS DANGEROUS
Board or flat stones
Kickback is generated when the rotation of the
chain is arrested for some reason. The most
dangerous effect of this action occurs when the
nose of the bar contacts another object, the chain
is momentarily stopped and all the energy of the
engine throws the bar upwards and backwards
towards the operator.
The chain saw industry and government agen-
cies have attempted to prescribe various safety
devices, but the best protection is to avoid kick-
back.
Comply with the Safety Precautions as listed in
this manual.
CS-370
21
CHAIN BRAKE OPERATION
• Set the lever in the unlocked position before
starting to cut.
Kickback motion
• 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 firmly by the handles and acceler-
ate the engine to a fast idle.
• Slowly operate the chain brake lever while hold-
ing the saw firmly on the ground. When the
brake lever trips, the chain should stop.
Immediately release the throttle trigger.
Kickback
WARNING
If the chain does not stop immediately, return
the saw to your authorized ECHO dealer for
repair.
Chain brake function
When the lever is pushed forward, chain brake
instantly stops the chain.
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.
Chain brake unlock
When the lever is fully pulled, toward the
operator, brake is unlocked.
IMPORTANT
Do not allow the saw to tip forward in order to
avoid damage to the chain.
CS-370
22
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:
End of the guide bar may be placed at the
height of about 35 cm (14 in.).
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.
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.
35 cm
(14 in.)
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.
WINTER OPERATION
Use the winter plug to prevent carburetor trouble in
winter.
Air cleaner cover
Plug
• Remove air cleaner cover. Remove plug from
warm weather position, and install into cold
weather “storage” position.
Cold weather
“storage” position
Warm weather position
NOTE
For operation at normal temperature return the
plug to its original place. (5°C, 41°F)
It causes over heating of the engine.
CS-370
23
ChAIN AND GUIDE BAR COMBINATION
The following combinations are recommended for model CS-370.
Guide Bar
ECHO Part No.
Saw Chain
Type
Length
Pitch
Links
mm (in.)
Double Guard
14A0CD3752
16A0CD3757
18A0CD3762
mm (in.)
(OREGON)
91P, 91VG
91P, 91VG
91P, 91VG
356 (14)
406 (16)
457 (18)
9.53 (3/8)
9.53 (3/8)
9.53 (3/8)
52
57
62
WARNING
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 the ANSI B175.1-2000 Standard when tested on
the representative sample of chain saws below 3.8 C.I.D., and the Echo guide bar specified.
IMPORTANT
Chain and guide bar gauge size must be identical. Use Bar/Chain combinations shown in table
above.
IMPORTANT
If your kick guard is damaged or lost, contact your Echo dealer for a replacement. For the name
com.
Refer to your Chain Saw Safety Manual for kick guard application information.
SAW CHAIN
GUIDE BAR
(Low-kickback)
(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.
CAUTION
Do not use replacement saw chain unless
it has been designated as meeting the
ANSI B175.1 - 2000 kickback performance
requirements, when tested on the
representative sample of chain saws below
3.8 c.i.d. specified in ANSI B175.1 - 2000.
• Hard nose guide bars of the same length and
nose radius as a sprocket nose bar.
NOTE
LOW KICKBACK SAW CHAIN meets the
kickback performance requirements of ANSI
B175.1 - 2000 (safety requirements for gasoline-
powered chain saws).
CS-370
24
MA IN T E N A N C E A N D CA R E
WARNING
Moving parts can amputate fingers or cause severe injuries. Keep hands, clothing and loose objects away from
all openings. Always stop engine, disconnect spark plug, and make sure all moving parts have come to a com-
plete stop before removing obstructions, clearing debris, or servicing unit. Allow unit to cool before performing
service. Wear gloves to protect hands from sharp edges and hot surfaces.
Your ECHO unit is designed to provide many hours of trouble free service. Regular scheduled maintenance will help
your unit achieve that goal. If you are unsure or are not equipped with the necessary tools, you may want to take your
unit to an ECHO Service Dealer for maintenance. To help you decide whether you want to DO-IT-YOURSELF or
have the ECHO Dealer do it, each maintenance task has been graded. If the task is not listed see your Echo dealer
for repairs.
S K IL L L E v E L S
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.
M A IN T E N A N C E IN T E R v A L S
REQ'D
SKILL
LEVEL
DAILY OR
BEFORE
USE
3 MONTHS
OR 90
HOURS
COMPONENT/
SYSTEM
MAINTENANCE
PROCEDURE
EVERY
REFUEL
YEARLY 600
HOURS
Air Filter
Inspect/Clean
1
1
1
1
1
1
I / C *
R *
Automatic Oiler
Oil Filter
Inspect/Adjust
Inspect/Replace
Inspect/Replace
Inspect/Replace
Replace
I
I
I/C *
Fuel System
Fuel Filter
I (1) *
I (1) *
I *
I *
I / R *
R *
Fuel Cap Gasket
Guide Bar & Sprocket
Nose
Inspect/Clean/Lubricate
1
2
I / C *
I
Inspect/Sharpen/Replace/
Tensioning
Saw Chain
I *
I *
Sprocket
Inspect/Replace
Inspect/Clean
Inspect/Clean
2
1
2
2
2
1
1
Spark Plug
Cooling System
I / C / R *
I / C
Muffler Spark Arrestor Inspect/Clean/Replace
Cylinder Exhaust Port Inspect/Clean/Decarbon
I / C / R *
I / C
Recoil Starter Rope
Screws/Nuts/Bolts
Inspect/Clean
I / C *
I *
Inspect/Tighten/Replace
MAINTENANCE PROCEDURE LETTER CODES: I = INSPECT, R = REPLACE, C = CLEAN
IMPORTANT NOTE - Time intervals shown are maximum. Actual use and your experience will determine the
frequency of required maintenance.
MAINTENANCE PROCEDURE NOTES:
(1) Low evaporative fuel tanks DO NOT require regular maintenance to maintain emission integrity.
* Replacement is recommended based on the finding of damage or wear during inspection.
CS-370
25
Idle adjusting screw
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
CW until the saw chain begins to turn, then
turn screw out CCW until the saw chain stops
turning. Turn screw out, CCW, an additional 1/4
turn.
Low speed needle (L)
High speed needle (H)
CARBURETOR ADJUSTMENT
Engine Break-In
New engines must be operated a minimum duration
of two tanks of fuel break-in before carburetor adjust-
ments can be made. During the break-in period your
engine performance will increase and exhaust emis-
sions will stabilize. Idle speed can be adjusted as
required.
WARNING
Cutting attachment must not move when unit
is idling.
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 2400 - 2900 r/min.
High Altitude Operation
This engine has been factory adjusted to maintain sat-
isfactory starting, emission, and durability performance
up to 1,100 feet above sea level (ASL) (96.0 kPa). To
maintain proper engine operation and emission compli-
ance above 1,100 feet ASL the carburetor may need to
be adjusted by an authorized ECHO service dealer.
IMPORTANT
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.
CAUTION
When starting, idling adjustment speed
should be adjusted not to rotate the saw
chain. Correct idle speed is adjusted 2400
to 2900 r/min. Or 1/4 turn CCW from the
point the chain stops moving. When you
experience trouble with the carburetor,
contact your dealer.
CS-370
26
Cleaner cover knob
Spark plug
AIR FILTER
Air cleaner cover
• Check before every use.
• Loosen cleaner cover knob and remove air cleaner
cover and filter.
• Brush off dust lightly, or clean with compressed air, or
replace the air filter.
• Reinstall air filter and cover.
Air filter cover
Air filter
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.
Cylinder cover
SPARK PLUG
• Check periodically.
• The standard spark gap is 0.65 mm (0.026 in.).
• Correct the spark gap if it is wider or narrower than the
standard gap.
• Fastening torque:
150 to 170 Kgf • cm
(130 to 145 in • lbf).
0.65 mm (0.026 in.)
FUEL FILTER
• Check periodically.
• Do not allow dust to enter fuel tank.
• A clogged filter will cause difficulty in starting engine or
abnormalities in engine performance.
• Pull the fuel filter out through fuel inlet port with a piece
of steel wire or the like.
• When the filter is dirty, replace it.
• When the inside of the fuel tank is dirty, rinsing the tank
out with gasoline can clean it.
Oil filter
OIL FILTER
Fuel filter
Fuel tank cap
Oil tank cap
• Check periodically.
• Do not allow dust to enter into oil tank.
• A clogged oil filter will affect the normal lubricating
system.
• Pull it out through oil filling hole with a piece of steel
wire or the like.
• If the filter is dirty, wash it in gasoline or replace it.
• When the inside of the tank gets dirty, rinsing the tank
out with gasoline can clean it.
CS-370
27
Groove
Oil hole
GUIDE BAR
• Clean before using.
• Clean the groove of the guide bar with a small screw-
driver.
• Clean oil holes with a wire.
• Reverse guide bar periodically.
• Check sprocket and the clutch and clean the bar
mount area before installation of the bar.
Replace either or both if worn.
Sprocket
SPROCKET
Worn : 0.5 mm (0.020
• A damaged sprocket will cause premature damage or
wear of saw chain.
• When the sprocket has worn out 0.5 mm (0.020 in.) or
more, replace it.
• Check sprocket when you install new chain. Replace it
if worn.
CYLINDER FINS
• Check periodically.
• Clogged fins will result in poor engine cooling.
• Remove dirt and dust from between fins to let cooling
air pass easily.
Cylinder fins
MUFFLER SPARK ARRESTOR
• Remove air cleaner cover and remove spark plug lead.
• Remove spark arrestor screen cover and screen from
muffler body.
Muffler
• Clean carbon deposits from muffler components.
• Replace screen if it is cracked, or has holes burned
through.
• Assemble components in reverse order.
Spark arrestor screen
Screen cover
NOTE
Carbon deposits in muffler will cause drop in engine
output. Spark arrestor screen must be checked
periodically.
AUTOMATIC OILER
Adjusting screw
• The discharge volume of the automatic oiler is ad-
justed to 4 mL/min approximately at 7000 r/min, prior
to shipment from factory.
Decrease
Increase
• To increase the delivery volume, turn the adjusting
screw counterclockwise. When the screw touches
stopper and stops, this position indicates maximum
discharge volume. (13 to 14 mL/min at 7000 r/min)
• Do not turn the adjusting screw beyond the maximum
or minimum limit of volume adjustment.
CS-370
28
EXHAUST PORT CLEANING
Level 2
Tools required: Wood or plastic scraper, Cross Head Screwdriver,
8mm Wrench
Parts Required:
As needed: Muffler gasket
1. Remove air filter cover and remove spark plug lead.
2. Remove engine cover (3 screws).
3. Place piston at top dead center. Remove muffler (A) and muffler
gasket (B ).
B
4. Use a wood or plastic scraping tool to clean deposits from cylin-
der exhaust port.
IMPORTANT
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.
A
5. Inspect muffler gasket, and replace if damaged.
6. Install muffler gasket and muffler.
7. Tighten muffler mounting bolts (or nuts) to 70-95 in • lbf (80-110
kgf • cm).
8. Install engine cover and attach spark plug lead.
9. Replace air filter cover.
10. Start engine, and warm to operating temperature.
11. Stop engine, and re-tighten mounting bolts (or nuts) to specifica-
tions.
CS-370
29
SETTING ThE SAW ChAIN
Preset tie strap
Left hand cutter
Drive link
Top plate
Tie strap
Side plate
Depth guage
Guard link
Right hand cutter
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.
• Drive link serves to remove sawdust from the
groove of the guide bar.
Sharpen lower edge
Keep the lower edge of the drive link sharp
where indicated.
SETTING SAW CHAIN
• For setting saw chain, round file (4.0 mm dia.
5/32 in.) and flat file are used.
• To keep correct position and correct angle,
use the file holder (Sure Sharp®).
30°
Keep this angle
Push file as shown
90°
Hold the file horizontally
CS-370
30
1/5
One fifth of file diameter remains
above cutter edge
• 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.
Depth gauge tool
Remove until
flat with tool
• Be sure to round off the front edge of the depth
gauge.
Round off
the edge
Properly filed cutters are shown in illustration.
91P :85°
91VG :80°
When setting of the chain is finished, soak it in oil
and wash away filings completely before using.
• When chain has been filed on the bar, supply
sufficient oil to it, rotate the chain slowly to wash
away the filings before using again.
• If the chain saw is operated with filings clogged
in the groove, the saw chain and the guide bar
will be damaged prematurely.
• If the saw chain becomes soiled with resin, for
instance, clean it with kerosene and soak in it oil.
30°
Top plate filing angle
Side plate
91P :50°
91VG :60°
NOTE
0.64 mm (0.025 in.)
These angles are referred to as Oregon 91P
or 91VG. To sharpen other chain, follow chain
manufacturer’s instruction.
Parallel
Depth
Top plate cutting angle
CS-370
31
TROUBLEShOOTING
ENGINE PROBLEM TROUBLESHOOTING CHART
Problem
Check
Status
Cause
Remedy
Clean or replace
Fuel at carburetor
No fuel at carburetor Fuel strainer clogged
Fuel line clogged
Clean or replace
Carburetor
See your Echo dealer
Fuel at cylinder
No fuel at cylinder
Carburetor
See your Echo dealer
Muffler wet with fuel Fuel Mixture too rich
Open choke
Engine
cranks -
starts hard/
doesn't
Clean/replace air filter
Adjust carburetor
See your Echo dealer
Spark at end
of plug wire
No spark
No spark
Stop switch off
Electrical problem
Interlock switch
Turn switch to ON
See your Echo dealer
See your Echo dealer
start
Spark at plug
Spark gap incorrect
Covered with carbon
Fouled with fuel
Adjust to .65mm (0.026 in.)
Clean or replace
Clean or replace
Plug defective
Replace plug
Air filter
Air filter dirty
Normal wear
Clean or replace
Fuel filter
Fuel filter dirty
Contaminants/residues in Replace
fuel
Fuel vent
Fuel vent plugged
Contaminants/residues in Clean or replace
fuel
Engine runs,
but dies or
does not
accelerate
properly
Spark Plug
Carburetor
Plug dirty/worn
Normal wear
Clean and adjust or replace
Improper adjustment Vibration
Adjust
Cooling System
Cooling system
dirty/plugged
Extended operation in
dirty/dusty locations
Clean
Spark Arrestor
Spark arrestor
screen plugged
Normal wear
Replace
Screen
Engine does
not crank
N/A
N/A
Internal engine problem
See your Echo dealer
WARNING
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.
CS-370
32
STORAGE AFTER USE
• Inspect and adjust every part of the chain saw.
• Completely clean every part and repair if neces-
sary.
• Apply thin coating of oil on metal parts to prevent
rust.
WARNING
Do not store in an enclosure where fuel
fumes may accumulate or reach an open
flame or spark.
• Remove chain and guide bar.
CAUTION
Do not lend or rent your chain saw without
• Drain fuel tank, pull starter slowly a few times to
drain fuel from carburetor.
• Pour a small amount of clean motor oil into spark
plug hole, pull starter and crank the engine until
piston reaches: TOP DEAD CENTER.
• Store in a dry area, free from dust.
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, see “Additional
Or Replacement Manuals” on back page for
ordering information.
TEChNICAL DATA
CS-370
Dimension
Mass
L × W × H
mm
393 × 245 × 277 (15.5 in. × 9.6 in. × 10.9 in.)
4.5 (10.0 lb.) Without chain and guide bar
Air-cooled two-stroke single cylinder
Power head, dry
Type
kg
Engine
Displacement
mL (cm ) 36.3 (2.213 cu. in.)
Diaphragm type
Carburetor
Magneto
Flywheel magneto: CDI system
Spark plug
Starter
NGK BPM8Y
Recoil starter
Power transmission
Automatic centrifugal clutch
Fuel
EGD
stroke,
Mixture ratio
50 : 1 ratio with ECHO Power Blend X™, ISO-L-
(ISO/CD 13738) and JASO M345-FC/FD two-
air-cooled engine oil.
Gasoline
Use 89 octane unleaded.
Donotusefuelcontainingmethylalcohol,morethan
10 % ethyl alcohol or 15 % MTBE.
Do not use alternative fuels such as E-15 or E-85.
Tank capacity
Bar and chain
Tank capacity
L
L
0.41 (13.9 US. fl. oz.)
Oil
ECHO bar and chain oil (or motor oil)
0.28 (9.5 US. fl. oz.)
Guide bar and
See page 24 for Chain and Guide Bar Combination
saw chain
Lubrication
Adjustable automatic oil pump
Engine speed Idle
Clutch engagement
Wide open throttle
r/min
r/min
r/min
2400 - 2900
3800
12000 - 12500
Standard
features
Front hand guard, Rear hand guard,
Anti-vibration device, Spiked bumper,
Throttle control lockout, Chain brake,
Chain catcher, Spark arrestor muffler, Kick guard
* Technical data subject to change without notice.
CS-370
33
WA R R A N T Y ST A T E M E N T S
ECHO LIMITED WARRANTY STATEMENT FOR
PRODUCT SOLD IN USA AND CANADA BEGINNING 01/01/2010
ECHO'S RESPONSIBILITY
ECHO Incorporated’s Limited Warranty, provides to the original purchaser that this ECHO product is free from defects in material and workmanship.
Under normal use and maintenance from date of purchase, ECHO agrees to repair or replace at ECHO’s discretion, any defective product
free of charge at any authorized ECHO servicing dealer within listed below application time periods, limitations and exclusions. THIS LIMITED
WARRANTY IS ONLYAPPLICABLE TO ECHO PRODUCTS SOLD BYAUTHORIZED ECHO DEALERS. IT IS EXTENDED TO THE ORIGINAL
PURCHASER ONLY, AND IS NOT TRANSFERABLE TO SUBSEQUENT OWNERS EXCEPT FOR EMISSION RELATED PARTS. Repair
parts and accessories replaced under this warranty are warranted only for the balance of the original unit or accessory warranty period. Any
damage caused by improper installation or improper maintenance is not covered by this warranty. All parts or products replaced under warranty
become the property of ECHO, Inc. This warranty is separate from the Emission control warranty statement supplied with your new product.
Please consult the Emission Control Warranty Statement for details regarding emission related parts. For a list of Authorized ECHO Dealers
refer to WWW.ECHO-USA.COM or call 1-800-432-ECHO.
OWNER’S RESPONSIBILITY
To ensure trouble free warranty coverage it is important that you register your ECHO equipment on-line at WWW.ECHO-USA.COM or by fill-
ing out the warranty registration card supplied with your unit. Registering your product confirms your warranty coverage and provides a direct
link if we find it necessary to contact you.
The owner shall demonstrate reasonable care and use, and follow preventative maintenance, storage, fuel and oil usage as prescribed in the
operator’s manual. Should a product difficulty occur, you must, at your expense, deliver or ship your ECHO unit to an authorized ECHO servicing
dealer for warranty repairs (within the applicable warranty period), and arrange for pick-up or return of your unit after the repairs have been
made. For your nearest authorized ECHO servicing dealer, call ECHO’s Dealer Referral Center, at 1-800-432-ECHO or you can locate an ECHO
servicing dealer at WWW.ECHO-USA.COM. Should you require assistance or have questions concerning ECHO’s Warranty Statement, you
can contact our Consumer Product Support Department at 1-800-673-1558 or contact us through the web at WWW.ECHO-USA.COM.
PRODUCT WARRANTY PERIOD
RESIDENTIAL APPLICATION
•
5 YEAR WARRANTY - All units for residential, or non-income producing use will be covered by this limited warranty for five (5) years from
date of purchase.
EXCEPTIONS:
•
For two-stroke engine powered products, the electronic ignition module, flexible drive cables, SRM solid drive shafts, and TC tines
are warranted for the life* of the product on parts only.
•
Cutting attachments such as, but not limited to, bars, chains, sprockets, blades, and nylon trimmer heads for residential or non-income
producing use will be covered for failures due to defects in material or workmanship for a period of 60 days 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
designed to fit.
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 (1) year 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 (2) years from the date of purchase.
EXCEPTIONS:
•
For two-stroke engine powered products, the electronic ignition module, flexible drive cables, SRM solid drive shafts and TC tines,
are warranted for the life* 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 30 days 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
designed to fit.
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.
* ECHO’s liability under the “Lifetime” coverage is limited to furnishing parts specified under the PROdUCT wARRANTy PERIOd section of
this warranty statement for “Life” free of charge for a period of ten (10) years after the date of the complete unit’s final production.
CS-370
34
PURCHASED REPAIR PARTS, SHORT BLOCKS AND ACCESSORIES
• 90-day residential, 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 M345/FC/FD Standards. ECHO Power Blend™ Two-Stroke Oil is a premium two-stroke oil specifically formulated to meet
ISO-L-EGD (ISO/CD 13738) and JASO M345/FC/FD 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 M345/
FC/FD Standards. Engine problems due to inadequate lubrication caused by failure to use an ISO-L-EGD compliant and JASO M345/FC/
FD registered oil, will void the two-stroke engine limited warranty. ECHO Power Blend™ Two-Stroke Oil meets the ISO-L-EGD and JASO
M345/FC/FD Standard. Emission related parts are covered for 5 years residential use or 2 years commercial use regardless of two-stroke
oil used, per the statement listed in the EPA or California Emission Defect Warranty Explanation.
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 maximum 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.
Engine damage caused by use of ether or any starting fluids.
•
•
•
damage caused by tampering with engine speed governor or emission components, or running engines above specified and recommended
engine speeds as listed in your operator’s manual.
•
•
•
Operation of the unit with improperly maintained/removed cutting shield or removed/damaged air filter.
damage caused by dirt, pressure or steam cleaning the unit, salt water, corrosion, rust, varnish, abrasives, and moisture.
defects, malfunctions or failures resulting from abuse, misuse, neglect, modifications, alterations, normal wear, improper servicing, or use
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.
•
•
Adjustments after the first (30) thirty days and beyond, such as carburetor adjustment and throttle cable adjustment.
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.
damage caused by pump or sprayer running dry, pumping or spraying caustic or flammable materials, or lack of or broken strainers.
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
consequential damages, so you may also have other specific legal rights which vary from state to state. This limited warranty is given by ECHO
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 MERCHANTABILITY otherwise applicable to this product. ECHO and its affiliated companies shall not be
liable for any special incidental or consequential damage, including lost profits. There are no warranties extended other than as provided herein.
This limited warranty may be modified only by ECHO.
99922201032
12/03/09
CS-370
35
ECHO INCORPORATED EMISSION CONTROL WARRANTY STATEMENT
FOR ECHO AND SHINDAIWA BRANDS
The Environmental ProtectionAgency (EPA) and the CaliforniaAir Resources Board (C.A.R.B.) and ECHO Incorporated (ECHO Inc.) are pleased
to explain the emission control system warranty on your 2010 and later equipment/small off-road engine (SORE). New equipment/SORE must be
designed, built and equipped to meet stringent EPA and C.A.R.B. anti-smog standards. ECHO Inc. must warrant the emission control system on
your equipment/SORE for the periods of time listed below, provided there has been no abuse, neglect or improper maintenance of your equipment/
SORE. Your emission control system may include parts such as: carburetor, fuel-injection system, ignition system, catalytic converter/muffler, fuel
tank, fuel feed lines, fuel cap assembly, spark plug, air filters, and other associated components. Where a warrantable condition exists, ECHO
Inc will repair your equipment/SORE at no cost to you including diagnosis, parts and labor. The Emission Control System warranty is extended
to the original owner including all subsequent owners.
MANUFACTURER'S WARRANTY COVERAGE:
The emission control system is warranted for 2 years or the length of the ECHO Inc. warranty, whichever is longer. If any emission-related part
on your equipment is defective, the part will be repaired or replaced by ECHO Inc. or its Authorized Service Representative.
OWNER'S WARRANTY RESPONSIBILITIES:
As the equipment/SORE owner, you are responsible for the performance of the required maintenance listed in your Operator's Manual. ECHO
Inc. recommends that you retain all receipts covering maintenance on your equipment/SORE however, ECHO Inc. cannot deny warranty solely
for the lack of receipts or for your failure to ensure the performance of all scheduled maintenance. As the equipment/SORE owner, you should be
aware that ECHO Inc. may deny you warranty coverage if your equipment/SORE or a part has failed due to abuse, neglect, improper maintenance
or unapproved modifications.
You are responsible for presenting your equipment/SORE to an ECHO Inc. authorized service representative as soon as a problem exists. The
warranty repairs should be completed in a reasonable amount of time, not to exceed 30 days. If a warrantable condition exists and there is no
Authorized Dealer within 100 miles, ECHO Inc. will pay to ship the unit to the nearest authorized dealer. If you have questions regarding your
warranty coverage, you should contact ECHO Inc. at 1-800-673-1558, web site WWW.ECHO-USA.COM or contact Shindaiwa at 1-877-986-
7783, web site WWW.SHINDAIWA.COM.
WHAT DOES THIS WARRANTY COVER?
ECHO Inc. warrants that your equipment/SORE was designed, built and equipped to conform with applicable EPA and C.A.R.B. emissions
standards and that your equipment/SORE is free from defects in material and workmanship that would cause it to fail to conform with applicable
requirements for 2 years or the length of the ECHO Inc. warranty, whichever is longer. The warranty period begins on the date the product is
purchased by an end user.
HOW WILL A COVERED PART BE CORRECTED?
If there is a defect in a part covered by this warranty, any ECHO Inc. Authorized Service Dealer will correct the defect. You will not have to pay
anything to have the part adjusted, repaired or replaced. This includes any labor and diagnosis for warranted repairs performed by the dealer. In
addition, engine parts not expressly covered under this warranty but whose failure is a result of a failure of a covered part will be warranted.
WHAT PARTS ARE COVERED?
Any applicable emission related part not scheduled for "required maintenance" will be repaired or replaced within the warranty period. The repaired
or replaced part will be warranted for the remaining ECHO Inc. warranty period.
Any warranted part that is scheduled only for regular inspection in the written instructions supplied is warranted for the warranty period stated
above. Any such part repaired or replaced under warranty will be warranted for the remaining ECHO Inc. warranty period.
Any emission related part scheduled for replacement during "required maintenance" is warranted for the period of time prior to the first scheduled
replacement point for that part. Any such part repaired or replaced under warranty shall be warranted for the remainder of the period prior to the
first scheduled replacement point for that part.
Any manufacturer-approved replacement part may be used in the performance of any warranty maintenance or repairs on emission related parts,
and must be provided without charge if the part is still under warranty.
Any replacement part that is equivalent in performance and durability may be used in non-warranty maintenance or repairs, and shall not reduce
the warranty obligations of the manufacturer.
Throughout the equipment/SORE warranty period, ECHO Inc. will maintain a supply of warranted parts sufficient to meet the expected demand
for such parts.
SPECIFIC EMISSION RELATED WARRANTED PARTS:
• Electronic Ignition System
• Catalytic Converter / Muffler Assembly
• Choke
• Spark Plug
• Carburetor (complete assembly or replaceable components)
• Fuel-Injection Assembly (or replaceable components)
• Fuel Cap Assembly
• Fuel Tank
• Air Filter
• Fuel Feed Line (and associated clamps/connectors as applicable)
WHAT IS NOT COVERED?
Any failure caused by abuse, neglect, improper maintenance, unapproved modifications, use of unapproved add-on parts/modified parts or
unapproved accessories.
99922201033
01/2010
This Emission Control Warranty is valid only for the U.S.A., it's Territories, and Canada.
CS-370
36
N O T E S
CS-370
37
N O T E S
CS-370
38
N O T E S
CS-370
39
SE R v IC IN G IN F O R M A T IO N
P A R T S /S E R IA L N U M B E R
Genuine ECHO Parts and ECHO REPOWER™ Parts and As-
semblies for your ECHO products are available only from an Au-
thorized ECHO Dealer. When you do need to buy parts always
have the Model Number, Type 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. ___________ Type _________SN. ______________
S E R v IC E
Service of this product during the warranty period must be per-
formed 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 present-
ing your unit for Warranty service/repairs, proof of purchase is
required.
DEALER? Call
1-800-432-ECHO
1-800-432-3246
or
E C h O C O N S U M E R P R O D U C T S U P P O R T
If you require assistance or have questions concerning the ap-
plication, operation or maintenance of this product you may call
the ECHO Consumer Product Support Department at 1-800-673-
1558 from 8:30 am to 4:30 pm (Central Standard Time) Monday
through Friday. Before calling, please know the model and serial
number of your unit.
CONSUMER PRODUCT
SUPPORT
1-800-673-1558
8:30 - 4:30 Mon - Fri C.S.T.
W A R R A N T Y R E G IS T R A T IO N
To ensure trouble free warranty coverage it is important that you
filling out the warranty registration card supplied with your unit.
Registering your product confirms your warranty coverage and
provides a direct link between you and ECHO if we find it neces-
sary to contact you.
A D D IT IO N A L O R R E P L A C E M E N T M A N U A L S
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.
Safety Videos are available from your Echo dealer. A $5.00 shipping charge will be required for each video.
ECHO, INCORPORATED
400 Oa k w O O d RO a d
La k e Zu R ic h , iL 60047-1564
C08011001001/C08011999999
C06212001001/C06212999999
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