Echo CS-370 User manual

X7503251501X750012231
01/10
WARNING
Read rules for safe operation and instructions carefully. ECHO provides an
Instruction Manual and a Safety Manual. Both must be read and understood
for proper and safe operation.
Chain Saw
Instruction Manual
MODEL : CS-370

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CS-370
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Copyright ©2007 All Rights Reserved.
1. Fatigue causes carelessness. Be more
cautious before rest periods and before
the end of your shift.
2. Personal protective clothing required by
your safety organizations, government
regulations, or your employer should be
used; otherwise, sung fitting clothing,
protective eyewear, safety footwear and
hand, leg and hearing protection should
be worn.
Note: Personal protective clothing
should meet the requirements
of applicable Standards.
3. Before fueling, servicing or transporting
your chain saw switch off the engine. To
help prevent fire, restart your chain saw
at least 3 m from the fueling area.
4. When using a chain saw a fire
extinguisher should be available.
5. When felling, keep at least 2 tree
lengths between yourself and your
fellow workers.
6. Plan your work; assure yourself of an
obstacle-free work area and, in the case
of felling, of an escape path from the
falling tree.
7. Follow instructions in your operator’s
manual for starting the chain saw and
control the chain saw with a firm grip on
both handles when it is in operation.
Keep handles dry, clean and free of oil.
A chain saw should never be carried
with the engine running.
8. When transporting your chain saw, use
the appropriate transportation covers
that should be available for the guide
bar and saw chain.
9. Never operate a chain saw that is
damaged, improperly adjusted, or is not
completely and securely assembled. Be
sure that the saw chain stops moving
when the throttle control trigger is
released. Never adjust the guide bar or
saw chain when the engine operating.
10. Beware of carbon monoxide poisoning.
Operate the chain saw in well-ventilated
areas only.
RULES FOR SAFE OPERATION
11. Do not attempt a pruning or liming
operation in a standing tree unless
specifically trained to do so.
12. Guard against kickback. Kickback is the
upward motion of the guide bar, which
occurs when the saw chain, at the nose
of the guide bar, contact an object.
Kickback can lead to dangerous loss of
the chain saw.
TO AVOID KICKBACK:
(a) Contact of the guide bar tip with any
object should be avoided.
(b) Tip contact may cause the guide bar
to move suddenly upward and
backward which may cause serious
injury.
(c) Always use two hands when
operating the chain saw.
(d) Use a firm grip, thumbs and fingers
encircling the handles.
(e) Don’t overreach.
(f) Avoid cutting above shoulder height.
(g) Follow the manufacture’s instructions
for sharpening and maintenance of
the saw chain.
13. When boring with the chain saw, the
initial cut should be introduced with the
lower part of the nose (tip) until the hole
is sufficiently large so as to introduce the
entire nose (tip) of the guide bar. This
technique should reduce the danger of
kickback.
14. A chain saw is intended for two-handed
use. Serious injury to the operator,
helpers and/or bystanders may result
from one-handed operation.
CAUTION
A. Allow your chain saw to cool before
refueling, and do not smoke while
refueling.
B. Do not allow other persons or animals
close to running chain saw or close to
where a tree is being felled.
C. Use extreme caution when cutting small
size brush and saplings because
slender material may catch the saw
chain and be whipped toward you.
D. When cutting a limb that is under
tension is alert for spring-back.
Copyright© 2010 By Echo, Incorporated
All Rights Reserved.
RULES FOR SAFE OPERATION

3CS-370
WARNING
Moving parts can amputate ngers or cause severe injuries. Keep hands, clothing and loose objects away from
all openings.
• ALWAYS stop engine, disconnect spark plug, and make sure all moving parts have come to a complete stop
before removing obstructions, clearing debris, or servicing unit.
• DO NOT start or operate unit unless all guards and protective covers are properly assembled to unit.
• NEVER reach into any opening while the engine is running. Moving parts may not be visible through openings.
WARNING
Using improper replacement components or removing safety devices may result in serious or fatal injury.
WARNING
• During operation, the mufer or catalytic mufer and surrounding cover become hot.
• Never suspend the saw on a lanyard with the engine running.
• Always use the saw from the right-hand side of your body – NEVER from the left side.
• Always wear proper safety clothing to protect your lower body from sharp saw chain and
hot mufer.
• Always keep exhaust area clear of ammable debris during transportation or when storing,
otherwise serious property damage or personal injury may result.
WARNING
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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WARNING
The safety alert symbol accompanied by
the word “WARNING” calls attention to an
act or condition which CAN lead to serious
personal injury or death if not avoided.
CIRCLE AND SLASH SYMBOL
This symbol means the specic action
shown is prohibited. Ignoring these
prohibitions can result in serious or
fatal injury.
CAUTION
The safety alert symbol accompanied by
the word “CAUTION” calls attention to an
act or condition which may lead to minor or
moderate personal injury if not avoided.
NOTE
This enclosed message provides tips for use,
care and maintenance of the unit.
IMPORTANT
The enclosed message provides information
necessary for the protection of the unit.
DANGER
The safety alert symbol accompanied by
the word “DANGER” calls attention to an
act or condition which WILL lead to serious
personal injury or death if not avoided.
SYMBOLS AND SIGNS
CONTENTS
RULES FOR SAFE OPERATION....................................................................................................................... 1
SYMBOLS AND SIGNS...................................................................................................................................... 4
EMISSION DATA............................................................................................................................................. 6
PACKING LIST ................................................................................................................................................... 6
NOMENCLATURE OF PARTS.......................................................................................................................... 7
OPERATOR SAFETY........................................................................................................................................ 9
CORRECT USE OF CHAIN BRAKE............................................................................................................... 10
PREPARATION FOR USE ............................................................................................................................... 11
FUEL AND LUBRICANT.................................................................................................................................. 13
OPERATION..................................................................................................................................................... 15
CUTTING INSTRUCTION................................................................................................................................ 18
CHAIN AND GUIDE BAR COMBINATION ....................................................................................................... 23
MAINTENANCE AND CARE............................................................................................................................ 24
- Carburetor Adjustment ................................................................................................................................... 25
- High Altitude Operation ................................................................................................................................. 25
SETTING THE SAW CHAIN............................................................................................................................. 29
TROUBLESHOOTING ..................................................................................................................................... 31
STORAGE AFTER USE ................................................................................................................................... 32
WARRANTY STATEMENTS ............................................................................................................................ 33
TECHNICAL DATA ........................................................................................................................................... 36
This chain saw is designed for cutting wood or wood products. Do not cut solid metal, sheet metal, plastic or any non-
wood materials.
Specications, descriptions and illustrative material in this literature are as accurate as known at the time of publica-
tion, but are subject to change without notice. Illustrations may include optional equipment and accessories, and may
not include all standard equipment.

5CS-370
DECALS
SYMBOL FORM
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CS-370
Carburetor adjustment
- Idle speed
Carburetor adjustment
- High speed mixture
Carefully read the operator’s
manual
Wear eyes, ears and head
protection
Carburetor adjustment
- Low speed mixture
Oil and gasoline mixture
Symbol form/shape Symbol description/application Symbol form/shape Symbol description/application
Chain oiler adjustmentChain brake operation
Chain oil pump
Chain oil fill
DECALS
Locate this safety decal on your unit. The complete
unit illustration found in the “NOMENCLATURE OF
PARTS” section will help you locate them.
Make sure the decal is legible and that you
understand and follow the instructions on it. If a
decal cannot be read, a new one can be ordered
from your ECHO dealer.
Emergency stop
Choke control “Cold Start”
position (choke closed)
STOP
SYMBOL FORM
ATTENTION
Pour un travail en sécurité, respectez toutes
les règles de sécurité et les indications du
manuel d’utilisation. (Le manuel d’utilisation
est disponibile chez votre agent ECHO.) Tenez
fermement la tronçonneuse des deux mains.
Part Number 890324-39630
TO AVOID KICKBACK
1. Contact of the guide bar tip with any
object should be avoided.
2. Tip contact may cause the guide bar to
move suddenly upward and backward
which may cause serious injury.
3. Always use two hands when operating
the chain saw.
Part Number X505-000450
CAUTION: For safe operation follow all
safety precautions and instructions in
operator’s Manual. (Replacement manuals
are available from your ECHO dealer.)
Hold chain saw firmly with both hands.
Part Number X503-007160
CS-370 CAUTION/ATTENTION
Hearing protectors meeting the requirements
of CSA Standard Z94.2 should be worn.
Les protecteurs auditifs pouvant être porter
doivent recontrer les normes CSA Standard
Z94.2.
Part Number 890176-39431
POUR ÉVITER LES REBONDISSEMENTS
1. Éviter tout contact entre le nez du
guide-chaîne et un objet quelconque.
2. Tout contact du nez peut provoquer un
mouvement brusque vers le haut ou vers
le bas et entraîner de graves blessures.
3. Toujours employer lex deux mains
pour opérer la scie à chaîne.
Part Number X505-000460
REPLACEMENT BAR AND CHAIN
PEMPLACEMENT DU GUIDE ET DE LA CHAÎNE
GUIDE BAR P/NO. CHAIN TYPE CKA
GUIDE PIÈCE NO. TYPE DE CHAÎNE
14” 14A0CD3752 OREGON 91P/91VG 52 22.3
16” 16A0CD3757 OREGON 91P/91VG 57 20.1
18” 18A0CD3762 OREGON 91P/91VG 62 22.5
CKA means Computed Kickback Angle.
CKA Signifie angle de rebondissement calculé.
Note;There may be other replacement
components for achieving kickback
protection. For details, please refer
to the chain and bar combination
sheet shown in the operator’s manual.
REMARQUE; Il y peut y avoir d’autres
composantes de remplacement qui protègent
en cas de rebondissement. Pour plus de
détails, se référer à la feuille sur les
combinaisons de guide et de chaîne du
manuel de l’utilisateur.
Part Number X524-001720
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CS-370
Carburetor adjustment
- Idle speed
Carburetor adjustment
- High speed mixture
Carefully read the operator’s
manual
Wear eyes, ears and head
protection
Carburetor adjustment
- Low speed mixture
Oil and gasoline mixture
Symbol form/shape Symbol description/application Symbol form/shape Symbol description/application
Chain oiler adjustmentChain brake operation
Chain oil pump
Chain oil fill
DECALS
Locate this safety decal on your unit. The complete
unit illustration found in the “NOMENCLATURE OF
PARTS” section will help you locate them.
Make sure the decal is legible and that you
understand and follow the instructions on it. If a
decal cannot be read, a new one can be ordered
from your ECHO dealer.
Emergency stop
Choke control “Cold Start”
position (choke closed)
STOP
SYMBOL FORM
ATTENTION
Pour un travail en sécurité, respectez toutes
les règles de sécurité et les indications du
manuel d’utilisation. (Le manuel d’utilisation
est disponibile chez votre agent ECHO.) Tenez
fermement la tronçonneuse des deux mains.
Part Number 890324-39630
TO AVOID KICKBACK
1. Contact of the guide bar tip with any
object should be avoided.
2. Tip contact may cause the guide bar to
move suddenly upward and backward
which may cause serious injury.
3. Always use two hands when operating
the chain saw.
Part Number X505-000450
CAUTION: For safe operation follow all
safety precautions and instructions in
operator’s Manual. (Replacement manuals
are available from your ECHO dealer.)
Hold chain saw firmly with both hands.
Part Number X503-007160
CS-370
CAUTION/ATTENTION
Hearing protectors meeting the requirements
of CSA Standard Z94.2 should be worn.
Les protecteurs auditifs pouvant être porter
doivent recontrer les normes CSA Standard
Z94.2.
Part Number 890176-39431
POUR ÉVITER LES REBONDISSEMENTS
1. Éviter tout contact entre le nez du
guide-chaîne et un objet quelconque.
2. Tout contact du nez peut provoquer un
mouvement brusque vers le haut ou vers
le bas et entraîner de graves blessures.
3. Toujours employer lex deux mains
pour opérer la scie à chaîne.
Part Number X505-000460
REPLACEMENT BAR AND CHAIN
PEMPLACEMENT DU GUIDE ET DE LA CHAÎNE
GUIDE BAR P/NO. CHAIN TYPE CKA
GUIDE PIÈCE NO. TYPE DE CHAÎNE
14” 14A0CD3752 OREGON 91P/91VG 52 22.3
16” 16A0CD3757 OREGON 91P/91VG 57 20.1
18” 18A0CD3762 OREGON 91P/91VG 62 22.5
CKA means Computed Kickback Angle.
CKA Signifie angle de rebondissement calculé.
Note;There may be other replacement
components for achieving kickback
protection. For details, please refer
to the chain and bar combination
sheet shown in the operator’s manual.
REMARQUE; Il y peut y avoir d’autres
composantes de remplacement qui protègent
en cas de rebondissement. Pour plus de
détails, se référer à la feuille sur les
combinaisons de guide et de chaîne du
manuel de l’utilisateur.
Part Number X524-001720

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CS-370
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 Power Blend X™
2-stroke oil sample
Instruction manual
ECHO chain saw
Safety Manual
Warranty registration
card
T-wrench
Guide bar
Kick
Guard®
Saw chain
EM I S S I O N DA T A
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.
E M I S S I O N C O N T R O L (E x h A U S T &E v A P O R A T I v E )
EPA 2010 and Later
The emission control system for the engine is EM/TWC
(Engine Modication 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.

7CS-370
6
NOMENCLATURE OF PARTS
25
21
16
17
18
20
19
15
5
4
8
6
10 11 12 13
14
3
X524-001460
X505-000450
X503-007160
9
22
23
24
X524-001720
7
890324-39630
89017639431
NOMENCLATURE OF PARTS
2
1
26

8
CS-370
NOMENCLATURE OF PARTS
1. Instruction manual - Included with unit. Read be-
fore operation and keep for future reference to learn
proper, safe operating techniques.
2. Safety manual - Describe operating and safety
instructions for this chain saw.
3. 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 lter.
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.
12. Spiked bumper - Device, tted in front of the guide
bar mounting point, acting as a pivot when in con-
tact with a tree or log.
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.
16. Cylinder cover - The cooling airow 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 rmly. 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
nger, 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muferorsparkarrestormufer
with catalyst -The mufer or catalytic mufer con-
trols exhaust noise and emission. The spark arres-
tor screen prevents hot, glowing particles of carbon
from leaving the mufer. Keep exhaust area clear of
ammable debris.

9CS-370
VIBRATION AND COLD
• It is believed that a condition called Raynaud’s Phe-
nomenon, which affects the ngers of certain individu-
als, may be brought about by exposure to vibration and
cold. Exposure to vibration and cold may cause tingling
and burning followed by loss of color and numbness
in the ngers.The following precautions are strongly
recommended because the minimum exposure which
might trigger the ailment is unknown.
• Keep your body warm, especially the head and neck,
feet and ankles and hands and wrists.
• Maintain good blood circulation by performing vigorous
arm exercises during frequent work breaks and also by
not smoking.
• Limit the number of hours of operation. Try to ll each
day with jobs where operating the chain saw, or other
hand-held power equipment is not required.
• If you experience discomfort redness and swelling of
the ngers, followed by whitening and loss of feeling,
consult your physician before further exposing yourself
to cold and vibration.
REPETITIVE STRESS INJURY
• It is believed that over-using the muscles and tendons
of the nger, hands, arms and shoulders may cause
soreness, swelling, numbness, weakness and extreme
pain to the areas just mentioned.
Certain repetitive hand activities may put you at a
high risk for developing a repetitive stress injury (RSI).
• An extreme RSI condition is Carpal Tunnel Syndrome
(CTS) which could occur when your wrist swells and
squeezes a vital nerve that runs through the area.
Some believe that prolonged exposure to vibration
may contribute to CTS.CTS can cause severe pain for
months or even years.
To reduce the risk of RSI/CTS, do the following:
• Avoid using your wrist in a bent, extended or twisted
position.
• Take periodic breaks to minimize repetition and rest
your hands.
• Reduce the speed and force in which you do the repeti-
tive movement.
• Do exercises to strengthen hand and arm muscles.
• See a doctor if you feel tingling, numbness or pain in
your ngers, hands, wrists or arms. The sooner RSI/
CTS is diagnosed, the more likely permanent nerve and
muscle damage can be prevented.
EYE AND HEARING PROTECTION
• Wear eye protection goggles that meet ANSI
Z 87.1 requirements. Goggles meeting the 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.
WEAR PROPER CLOTHING
• Snug tting durable clothing should be worn.Pants
should have long legs, DO NOT WEAR SHORTS.
Do not wear loose tting clothing, scarves, neck-
ties, jewelry or any item that may become tangled in
surrounding growth or the chain saw itself.
• Wear shoes with non-skid soles. DO NOT wear open
toed shoes or operate unit barefooted.
• Wear no-slip, heavy duty work gloves to improve your
grip on the chain saw handles. The gloves also help
reduce the transmission of machine vibration to your
hands.
• Keep long hair away from engine and air intake. Retain
hair with cap or net.
HOT HUMID WEATHER
• Heavy protective clothing can increase operator fa-
tigue which may lead to heat stroke. Schedule heavy
work for early morning, or late afternoon hours when
temperatures are cooler.
AVOID HOT SURFACES
• During operation, the mufer or catalytic mufer and
surrounding cover become hot.
• Never suspend the saw on a lanyard with the engine
running.
• Always use the saw from the right-hand side of your
body - NEVER from the left side.
• Always wear proper safety clothing to protect your
lower body from sharp saw chain and hot mufer.
• Always keep exhaust area clear of ammable debris
during transportation or when storing, otherwise seri-
ous property damage or personal injury may result.
OPERATOR SAFETY

10
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10
CS-370
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.
CORRECT USE OF CHAIN BRAKE
Liner kickback
Rotational kickback
Chain moving downward at impact
Rotational kickback
Reduced radius
belongs on top
Pinch
Kickback
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.
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
offices, your employer or your local dealer to
ensure that your chain saw conforms to the
required safety standard.
ECHO chain brakes have been designed and
tested to comply with international safety standards
as follows.
USA : ANSI Standard B175.1 - 2000
Safety Requirement for chain saws
Canada : CSA Standard Z 62.1 CHAIN SAWS
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.

11 CS-370
PREPARATION FOR USE
Bolt (A)
Dimple (D)
Recess (E)
Front hole (C)
Rear hole (B)
Nut (F)
Guide bar
Kick Guard®
Brake connector
Clutch cover
Brake lever
(Front hand guard)
Two nuts
WARNING
Saw chain is sharp! Always wear gloves
when handling assembly, otherwise serious
personal injury may result.
NOTE
The machine may be delivered with guide bar,
tip guard, and saw chain separated. Install guide
bar, tip guard, and saw chain as follows.
KICK GUARD®TO BAR INSTRUC-
TIONS
Tools Needed: Two 11 mm (7/16 in.) Wrenches.
For saws with Kick Guard®P/N 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.
3. Tighten nut (F) and bolt (A) using 11 mm (7/16
in.) wrenches until snug. Make certain Kick
Guard® is ush against guide bar.
4. Tighten nut (F) 1/8 additional turn.
5. Check to make certain Kick Guard®is tight on
guide bar.
GUIDE BAR AND SAW CHAIN IN-
STALLATION/REMOVAL
NOTE
• Move the chain brake lever (Front hand guard)
fully rearward to remove or install the clutch
cover to chain saw.
• Align the brake connector of the clutch cover to
the groove on the side of the brake lever (Front
hand guard).
1. Remove spark plug 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.

12
CS-370
4. Mount guide bar on studs and slide toward clutch to make
saw chain installation easier. Install chain with cutters on
top of guide bar facing forward.
5. Unlock the chain brake, and install the clutch cover over
the guide bar studs. Ensure chain tension adjuster pin ts
into the guide bar adjuster hole, brake band is positioned
around clutch drum. Tighten clutch cover nuts nger tight.
6. Turn saw over, and check brake band for correct position
on clutch drum. If brake band is not in place around drum,
remove cover, make sure brake is unlocked, and reinstall.
Tighten clutch cover nuts nger tight.
WARNING
Improper clutch cover assembly can result in serious
injury, and will cause severe saw damage if unit is
started. Never start or operate saw if brake band is not
in place on clutch drum. Always check chain brake
operation after replacing cover. Do not use saw if chain
brake does not function properly.
ADJUSTING CHAIN TENSION
IMPORTANT
Always loosen clutch cover nuts before turning the chain
tension adjuster, otherwise the clutch cover and tensioner
will be damaged.
1. Remove spark plug lead. (See page 25)
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. When chain is properly tensioned, tighten clutch cover nuts
securely - 20 to 23 N·m (200 to 230 kgf·cm).
7. Keep chain properly tensioned at all times.
NOTE
All chains require frequent adjustments.
Guide bar
adjuster
Clutch cover
Adjusting screw
Proper tension Improper tension
Unlock chain brake
Brake connector
Nuts
Adjuster pin
Clutch
Brake band
Direction to
tension the chain
Guide bar studs

13 CS-370
FU E L A N D LU B R I C 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 certied oil,
such as Echo premium Power Blend XTM, will void the two-stroke engine warranty.
IMPORTANT
Echo premium Power Blend XTM Universal 2-Stroke Oil may be mixed at 50:1 ratio for application in all Echo
engines sold in the past regardless of ratio specied in those manuals.
Handling Fuel
WARNING
Fuel is VERY ammable. Use extreme care when mixing, storing or handling or serious personal injury may result.
• Use an approved fuel container.
• DO NOT smoke near fuel.
• DO NOT allow ames or sparks near fuel.
• Fuel tanks/cans may be under pressure. Always loosen fuel caps slowly allowing pressure to equalize.
• NEVER refuel a unit when the engine is HOT or RUNNING!
• DO NOT ll fuel tanks indoors. ALWAYS ll fuel tanks outdoors over bare ground.
• DO NOT overll fuel tank. Wipe up spills immediately.
• Securely tighten fuel tank cap and close fuel container after refueling.
• Inspect for fuel leakage. If fuel leakage is found, do not start or operate unit until leakage is repaired.
• Move at least 3m (10 ft.) from refueling location before starting the engine.

14
CS-370
Mixing Instructions
1. Fill an approved fuel container with half of the required
amount of gasoline.
2. Add the proper amount of 2-stroke oil to gasoline.
3. Close container and shake to mix oil with gasoline.
4. Add remaining gasoline, close fuel container, and remix.
IMPORTANT
Spilled fuel is a leading cause of hydrocarbon emis-
sions. Some states may require the use of automatic
fuel shut-off containers to reduce fuel spillage.
After use
• DO NOT store a unit with fuel in its tank. Leaks can occur.
Return unused fuel to an approved fuel storage container.
Storage - Fuel storage laws vary by locality. Contact your 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
ames.
Fuel Mix Chart
50:1
IMPORTANT
Stored fuel ages. Do not mix more fuel than
you expect to use in thirty (30) days, ninety
(90) days when a fuel stabilizer is added.
IMPORTANT
Stored two-stroke fuel may separate. ALWAYS
shake fuel container thoroughly before each
use.
Oil tank cap
Fuel tank cap
Cap indication
Fuel/oil tanks are indicated by the following
illustrations.
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.
• 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
SAE No. 10....... in winter or when cutting resin-
ous trees.
• When refueling, also rell chain oil.

15 CS-370
WHEN THE ENGINE IS COLD
CAUTION
Make sure the bar and chain are free from any
obstruction when starting the chain saw.
• Move chain brake lever fully forward to lock chain
brake before starting.
• Fill the fuel tank with fuel mixture.
It is not permitted to ll fuel above the shoulder level of
fuel tank.
• Fill the chain oil tank with lubricant. Do not over ll.
• Move ignition switch to “RUN” position.
• Push purge pump 3 to 4 times or until fuel is visible in
purge pump.
• Pull choke control knob all the way out. (Choke posi-
tion)
NOTE
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 rst ring sound.
• Push choke control knob all the way in.
• Pull starter handle to start the engine.
NOTE
If engine does not start after 5 pulls, repeat instruc-
tions.
OPERATION
Start / Run
Ignition switch
Chain brake
Starter handle
Choke
Choke control knob
Purge pump
WARNING
Moving parts can amputate ngers or cause severe injuries. Keep hands, clothing and loose objects away from
all openings. Always stop engine, disconnect spark plug, and make sure all moving parts have come to a com-
plete stop before removing obstructions, clearing debris, or servicing unit.
WARNING
Engine exhaust IS HOT, and contains Carbon Monoxide (CO), a poison gas. Breathing CO can cause uncon-
sciousness, serious injury, or death. Exhaust can cause serious burns. ALWAYS position unit so that exhaust is
directed away from your face and body.
WARNING
Operation of this equipment may create sparks that can start res around dry vegetation. This unit is equipped
with a spark arrestor and a spark arrestor may be required. The operator should contact local re agencies for
laws or regulations relating to re prevention requirements.
Open choke
Choke control knob

16
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16
CS-370
Throttle trigger lockout
Starter handle
Push
Throttle latch Throttle trigger
Chain brake
Start / Run
Ignition switch
Unlock chain brake
Unlock chain brake
Open choke
Choke control knob
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.
NOTE
If engine does not start after 5 pulls, use cold start
procedure.
WHEN THE ENGINE IS HARD TO
START
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.
• 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
trigger, to release throttle latch.
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.
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.
16
CS-370
Throttle trigger lockout
Starter handle
Push
Throttle latch Throttle trigger
Chain brake
Start / Run
Ignition switch
Unlock chain brake
Unlock chain brake
Open choke
Choke control knob
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.
NOTE
If engine does not start after 5 pulls, use cold start
procedure.
WHEN THE ENGINE IS HARD TO
START
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.
• 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
trigger, to release throttle latch.
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.
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.
16
CS-370
Throttle trigger lockout
Starter handle
Push
Throttle latch Throttle trigger
Chain brake
Start / Run
Ignition switch
Unlock chain brake
Unlock chain brake
Open choke
Choke control knob
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.
NOTE
If engine does not start after 5 pulls, use cold start
procedure.
WHEN THE ENGINE IS HARD TO
START
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.
• 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
trigger, to release throttle latch.
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.
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.
Open choke
Choke control knob

17 CS-370
RUNNING
WARNING
The saw chain should not move at idle, otherwise serious
personal injury may result.
NOTE
If saw chain moves adjust carburetor according to
“Carburetor Adjustment” instructions in this manual, or
see your dealer.
• When engine starts, 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.
• Conrm proper acceleration and lubrication of chain and
bar.
• Do not run the engine at high speed unnecessarily.
• Be sure that saw chain stops moving when throttle trigger
is released.
STOPPING
• Release throttle trigger and move ignition switch 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.
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.
17 CS-370
STOP
Ignition switch
Throttle trigger
RUNNING
WARNING
The saw chain should not move at idle, otherwise serious
personal injury may result.
NOTE
If saw chain moves adjust carburetor according to “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.
STOPPING
• Release throttle trigger and move ignition switch 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.
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.
Unlock chain brake

18
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CUTTING INSTRUCTION
Kickback
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 difcult at times to take care for your own safety, so
don’t assume the responsibility for a helper as well.
After you have learned the basic techniques of using
the saw, your best aid will be your own good common
sense.
The accepted way to hold the saw is to stand to the left
of the saw with your left hand on the front handlebar and
your right hand on the rear handle so you can operate
the throttle trigger with your right index nger.
Before attempting to fell a tree, cut some small logs or
limbs.
Become thoroughly familiar with the controls and the
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 difcult.
NOTE
Some material may adversely affect the housings of
your ECHO chain saw.
(Example: Palm Tree Acid, fertilizer, etc.) To avoid
housing deterioration, carefully remove all packed
saw dust around clutch and guide bar area and
wash with water. Coat metal parts with light oil.

19 CS-370
FELLING THE TREE
WARNING
A falling tree can seriously damage anything it may
hit - a car, a house, a fence, a power line, or another
tree. There are ways to make a tree fall where you
want it, so rst decide where that is!
Before cutting, clear the area around the tree.You will
need good footing while working and you should be
able to work the saw without hitting any obstacles. Next,
select a path of retreat.When the tree begins to fall you
should retreat away from the direction of fall at a 45-de-
gree angle and at least 3 m (10 feet) from the trunk to
avoid the trunk kicking back over the stump.
Begin the cut on the side to which the tree is to fall. Cut
a notch about 1/3 of the way into the tree. 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.
When the tree starts to fall, kill the engine, place the saw
on the ground and make your retreat quickly.
To fell big trees with a diameter exceeding twice the bar
length, start the notching cuts from one side and draw
the saw through to the other side of the notch.
Start the back cut on one side of the tree, pivoting the
saw through to form the desired hinge on that side.
Then remove the saw for the second cut. Insert the saw
in the rst cut, very carefully so as not to cause kick-
back. The nal cut is made by drawing the saw forward
in the cut to reach the hinge.
19 CS-370
FELLING THE TREE
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!
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.
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.
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.
1
2
3
Felling cut
Hinge
Direction of fall
First cut
Notch
Second cut
One-third tree diameter
Direction of fall
5 cm (2 in.)
5 cm (2 in.)
45°
45°
Not this way
Retreat
Retreat
3 m (10 feet)

20
CS-370
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 at
ground or supported as shown.
If you make the cut with the tree on the ground,
don’t let the saw’s chain dig into the earth; it is
harmful for the saw, and you stand a good chance
of being struck by ying debris.
To cut the trunk, use the bucking and two-cut
sequence shown.
The rst cut should be no deeper than one-third
the trunk diameter.
WARNING
KICKBACK IS DANGEROUS
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.
20
CS-370
Uphill position
Finish cut
First cut
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.
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.
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.
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.
WARNING
KICKBACK IS DANGEROUS
Kickback is generated when the rotation of the
chain is arrested for some reason. The most dan-
gerous 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.
Board or flat stones