OPERATOR’S MANUAL
CHAIN SAW
CS-370
WARNING
READ THE INSTRUCTIONS CAREFULLY AND FOLLOW THE
RULES FOR SAFE OPERATION.
FAILURE TO DO SO COULD RESULT IN SERIOUS INJURY.
ECHO POWER EQUIPMENT (CANADA)
501 Newbold Street, London, Ontario Canada N6E 1K4
X750-008 75 0
X750 325-020 0
Printed in Japan 0601Lr 0067 ES
RULES FOR SAFE OPERATION
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.
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 © 2005 All Rights Reserved.
CS-370
2
CONTENTS
RULES FOR SAFE OPERATION............................................................................. 2
NOMENCLATURE OF PARTS ................................................................................. 4
OPERATOR SAFETY............................................................................................... 6
CORRECT USE OF CHAIN BRAKE........................................................................ 7
PREPARATION FOR USE ....................................................................................... 8
FUEL AND LUBRICANT .......................................................................................... 10
OPERATION ............................................................................................................ 11
CUTTING INSTRUCTION........................................................................................ 14
MAINTENANCE AND CARE.................................................................................... 19
SETTING THE SAW CHAIN..................................................................................... 22
CHAIN AND GUIDE BAR COMBINATION ............................................................... 24
SERVICE GUIDE ..................................................................................................... 25
TROUBLESHOOTING ............................................................................................. 26
STORAGE AFTER USE........................................................................................... 27
TECHNICAL DATA ................................................................................................... 27
This spark ignition system complies with Canadian ICES-002.
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.
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.
WARNING
The safety alert symbol accompanied by the
word “WARNING” calls attention to an act or
condition which CAN lead to serious personal
injury or death if not avoided.
CAUTION
The safety alert symbol accompanied by the
word “CAUTION” calls attention to an act or
condition which may lead to minor or moderate
personal injury if not avoided.
NOTE
This enclosed message provides tips for use,
care and maintenance of the unit.
IMPORTANT
The enclosed message provides information
necessary for the protection of the unit.
CIRCLE AND SLASH SYMBOL
This symbol means the specific action
shown is prohibited. Ignoring these
prohibitions can result in serious or
fatal injury.
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CS-370
NOMENCLATURE OF PARTS
890324-39630
4
3
5
6
7
1
8
9
10
11
12
14
13
X524-001460
X524-001720
X505-000450
2
890176-39431
Part Number 890324-39630
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.
ATTENTION
Part Number X505-000460
POUR ÉVITER LES REBONDISSEMENTS
1. Éviter tout contact entre le nez du
guide-chaîne et un objet quelconque.
2. T out contact du nez peut pro v oquer 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 X524-001720
REPLACEMENT BAR AND CHAIN
PEMPLACEMENT DU GUIDE ET DE LA CHAÎNE
GUIDE BAR P/NO. CHAIN TYPE CKA
GUIDE PIECE 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 ma y be other replacement
components for achieving kickbac k
protection. For details, please refer
to the chain and bar combination
sheet shown in the operator’s man ual.
REMARQUE; Il y peut y av oir d’autres
composantes de remplacement qui protègent
en cas de rebondissement. P our plus de
détails, se référer à la feuille sur les
combinaisons de guide et de chaîne du
manuel de l’utilisateur.
15
16
17
18
Part Number X505-000450
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 890176-39431
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.
* If a decal cannot be read, a new one can be
ordered from your ECHO dealer.
X503-007160
24
23
19
20
21
Part Number X503-007160
CS-370
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.
22
CS-370
4
NOMENCLATURE OF PARTS
1. Operator’s manual - Included with unit.
Read before 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 activate the chain
brake which is to stop the saw chain rotation.
4. Cleaner cover knob - Device for installing the
air cleaner cover.
5. Air cleaner cover - Covers air filter.
6. Choke control knob - Device for enriching the
fuel/air mixture in the carburetor to aid cold
starting.
7. Rear hand guard - Extension on the lower part
of the rear handle for protecting the hand
from the chain if it breaks or degrooves.
8. Clutch cover - Protective cover to the guide
bar, saw chain, clutch and sprocket when the
chain saw is in use.
9. Chain tension adjuster - Device to adjust
chain tension.
10.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.
11.Spiked bumper - Device, fitted in front of the
guide bar mounting point, acting as a pivot
when in contact with a tree or log.
13. Saw chain - Chain, serving as a cutting tool.
14. Bar tip guard - Anti-kickback device attached
on the bar nose.
15. Cylinder cover - The cooling airflow grill. It
covers the cylinder, spark plug and silencer.
16. Front handle (for the left hand) - Support
handle located at the front of the engine
housing.
17. Oil tank cap - For closing the oil tank.
18. Starter handle - Pull handle slowly until starter
engages then quickly and firmly. When
engine starts, return handle slowly.
DO NOT let handle snap back or damage to
unit will occur.
19. Fuel tank cap - For closing the fuel tank.
20. Throttle latch - Device for temporality setting
the throttle in a partially open position to aid
starting.
21. Throttle trigger - Device activated by the
operator’s finger, for controlling the engine
speed.
22. Rear handle (for the right hand) - Support
handle located towards the rear of the
engine housing.
23. Throttle trigger lockout - A safety lever which
must be depressed before the throttle trigger
can be activated in order to prevent the
accidental operation of the throttle trigger.
24. Ignition switch - Device for connecting and
disconnecting the ignition system and thus
allowing the engine to be started or stopped.
12.Guide bar - The part that supports and guides
the saw chain.
5
CS-370
OPERATOR SAFETY
VIBRATION AND COLD
• It is believed that a condition called Ra ynaud’ s
Phenomenon, which affects the fingers of certain
individuals, may be brought about b y e xposure to
vibration and cold.
Exposure to vibration and cold may cause
tingling and burning followed b y 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 po wer equipment
is not required.
• If you experience discomfort redness and
swelling of the fingers, f ollo wed b y whitening and
loss of feeling, consult your physician before
further exposing yourself to cold and vibration.
REPETITIVE STRESS INJURY
• It is believed that ov er-using the muscles and
tendons of the finger, hands , arms and shoulders
may cause soreness, s welling, n umbness,
weakness and extreme pain to the areas just
mentioned.
Certain repetitive hand activities may put you at
a high risk for dev eloping a repetitiv e 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 believ e that prolonged
exposure to vibration may contrib ute to CTS.
CTS can cause severe pain for months or even
years.
To reduce the risk of RSI/CTS, do the following:
• Avoid using y our wrist in a bent, e xtended or
twisted position.
• Take periodic breaks to minimize repetition and
rest your hands.
• Reduce the speed and force in which you do the
repetitive mov ement.
• Do exercises to strengthen hand and arm
muscles.
• See a doctor if you feet 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.
EYE AND HEARING PROTECTION
• Wear eye protection goggles that meet ANSI
Z 87.1 requirements.
Goggles meeting the requirements have the
mark “Z 87” stamped on them.
• Wear hearing protection.
If this guideline is not followed, hearing loss can
occur.
ECHO recommends wearing hearing protection
at all times.
WEAR PROPER CLOTHING
• Snug fitting durable clothing should be worn.
Pants should ha v e long legs , DO NOT WEAR
SHORTS.
Do not wear loose fitting clothing, scarves,
neckties, jew elry or any item that ma y become
tangled in surrounding growth or the chain saw
itself.
• Wear shoes with non-skid soles.
DO NOT wear open toed shoes or oper ate unit
barefooted.
• Wear no-slip, hea vy duty work glov es to impro ve
your grip on the chain saw handles.
The gloves also help reduce the transmission of
machine vibration to your hands.
HOT HUMID WEATHER
• Heavy protective clothing can increase
operator fatigue which ma y 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 lan y ard 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 e xhaust area clear of flammab le
debris during transportation or when storing,
otherwise serious property damage or personal
injury may result.
CS-370
6
SPARK ARRESTOR MUFFLER
• The spark arrestor muffler controls the exhaust
noise and prevents hot, glo wing 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-cov ered areas in the
states of W ashington, Oregon, Idaho , Calif ornia,
Minnesota, New Jersey and Maine, are required
to be equipped with a spark arrestor.
CORRECT USE OF CHAIN BRAKE
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 J 335.
Check with your local or state authorities for
specific regulations in your area.
Failure to f ollo w these requirements is a violation of
the law .
Rotational kickback
Rotational kickback
Reduced radius
belongs on top
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 insur ance regulations in
your area of operation.
You should inquire through local government
offices, your emplo y er or y our local dealer to
ensure that your chain saw conforms to the
required safety standard.
ECHO chain brakes hav e been designed and
tested to comply with international safety standards
as follows.
Canada : CSA Standard Z 62.1,
Standard Z 62.3 CHAIN SAWS
USA : ANSI Standard B175.1-2000
Safety Requirement for chain sa ws
Chain moving downward at impact
Liner kickback
Kickback
Pinch
WARNING
CSA Z 62.1 STIPULATES THAT THE BRAKE
SHALL STOP THE CHAIN 0.12 SECONDS AT
AN ENGINE SPEED OF 13,500 r/min.
IT IS THE RESPONSIBILITY OF THE OWNER /
OPERATOR TO ENSURE THAT THE BRAKE
IS SERVICED, ADJUSTED AND TESTED
STRICTLY IN ACCORDANCE WITH THE
INSTRUCTIONS AS DETAILED HEREIN IN
ORDER TO ENSURE THAT THE BRAKE
PERFORMANCE IS MAINTAINED IN
COMPLIANCE WITH THE STANDARD
CSA Z 62.1.
7
CS-370
Bolt (A)
Dimple (D)
PREPARATION FOR USE
WARNING
SAW CHAIN IS SHARP! ALWAYS WEAR
GLOVES WHEN HANDLING ASSEMBLY,
OTHERWISE SERIOUS PERSONAL INJURY
MAY RESULT.
KICK GUARD® TO BAR
INSTRUCTIONS
Tools Needed: Two 11 mm Wrenches.
For saws with Kick Guard
Symmetrical Low-Kick type (Double Guard)
guide bars.
®
P/N 2893201 and
Kick Guard
Recess (E)
Nut (F)
Brake lever
(Front hand guard)
Brake connector
Clutch cover
®
Two nuts
Rear
hole (B)
Front hole (C)
Guide bar
®
must
®
®
1. Install bolt (A) in
and through front hole (C) in guide bar.
2. IMPORTANT: Dimple (D) in Kick Guard
engage recess (E) in guide bar.
3. Tighten nut (F) and bolt (A) using 11 mm
wrenches until snug. Mak e 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.
rear
hole (B) of Kick Guard
GUIDE BAR AND SAW CHAIN
INSTALLATION/REMOVAL
NOTE
Move chain brake lever (Front hand guard,
Brake connector) fully rearward to remove or
install the clutch cover to the chain saw.
1. Remove spark plug lead. (See page 20)
2. Remove two clutch cover n uts and remove clutch
cover.
3. Remove bar and saw chain if necessary. See
“Maintenance and Care” section f or guide bar/
saw chain maintenance procedures.
CS-370
8
Clutch
Brake band
Release chain brake
Guide bar
adjuster hole
Nuts
Adjuster pin
Clutch cover
Brake connector
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
foward.
5. Release the chain brake, and install the clutch
cover ov er the guide bar studs . Ensure chain
tension adjuster pin fits into the guide bar
adjuster hole, brake band is positioned around
clutch drum, and tab at rear of clutch cover fits
underneath tab on engine cover . Tighten clutch
cover nuts finger tight.
6. T u rn saw over, and check brake band f or correct
position on clutch drum. If brak e band is not in
place around drum, remove cover, make sure
brake is released, and reinstall. Tighten clutch
cover nuts finger 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.
Direction to tension
the chain
Adjusting screw
Proper tension Improper tension
ADJUSTING CHAIN TENSION
IMPORTANT
Always loosen clutch cover nuts before turning
chain tension adjuster, otherwise the clutch
cover and tensioner will be damaged.
1. Remove spark plug lead. (See page 20)
2. Loosen two clutch cover nuts, if necessary.
3. Hold the bar nose up, and turn the adjuster
screw clockwise until chain fits snugly against
underside of the bar.
4. Tighten both nuts with the bar nose held up.
5. Pull the chain around the bar by hand. Loosen
the adjustment if you feel tight spots .
6. When chain is properly tensioned, tighten clutch
cover nuts securely - 20 to 23 N·m (200 to 230
kgf·cm).
7. Keep chain properly tensioned at all times.
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CS-370
FUEL AND LUBRICANT
Oil
Gasoline
Fuel Mix Chart 50 : 1
Gasoline Oil
LmL
480
8 160
20 400
IMPORTANT
ECHO premium Power Blend™ Universal 2Stroke 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.
DANGER
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!
• NEVER REFUEL A UNIT WITH THE ENGINE
RUNNING.
• DO NOT FILL FUEL TANKS INDOORS.
ALWAYS FILL FUEL TANKS OUTDOORS
OVER BARE GROUND.
• SECURELY TIGHTEN FUEL CAP AFTER
REFUELING.
• INSPECT FOR FUEL LEAKAGE.
IF FUEL LEAKAGE IS FOUND, DO NOT
START OR OPERATE UNIT UNTIL
LEAKAGE IS REPAIRED.
• MOVE AT LEAST 3 m FROM REFUELING
LOCATION BEFORE STARTING THE
ENGINE.
1
50
FUEL STATEMENT
GASOLINE - Use 89 Octane [(R+M)/2] (mid grade
or higher) gasoline or gasohol known to be good
quality.
Gasohol may contain up to 10 % Ethyl (gr ain)
alcohol or 15 % MTBE (methyl teriary-butyl ether).
Gasohol containing methyl (wood) alcohol is NOT
approved.
TWO-STROKE OIL - A two-stroke engine oil
meeting ISO-L-EGD (ISO/CD 13738) and JASO
FC Standards must be used. ECHO br and premium
Po wer Blend™ Univ ersal 2-Strok e Oil meets these
standards. Engine problems due to inadequate
lubrication caused by failure to use an ISO-L-EGD
and JASO FC certified oil, such as ECHO premium
Po wer Blend™, will v oid the two-strok e engine
warranty. (Emission related parts only are covered
for two years , regardless of two-strok e oil used, per
the statement listed in the Emission Defect
Warranty Explanation.)
HANDLING FUEL
MIXING INSTRUCTIONS -
1. Fill an approved fuel container with half of the
required amount of gasoline.
2. Add the proper amount of two-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
emissions. Some states may require the use of
automatic fuel shut-off containers to reduce fuel
spillage.
• Stored fuel ages.
Do not mix more fuel than you expect to use in
thirty (30) days, ninety (90) days when a fuel
stabilizer is added.
• Stored two-stroke fuel may separate. ALWAYS
shake fuel container thoroughly before each
use.
AFTER USE -
DO NOT store a unit with fuel in its tank. Leaks can
occur. Return unused fuel to an approved fuel
storage container .
STORAGE -
Fuel storage laws vary by locality. Contact your
local government for the la ws affecting y our area.
As a precaution, store fuel in an approved, airtight
container. Store in a well-ventilated, unoccupied
building, aw ay from sparks and flames.
CS-370
10
CAP INDICATION
Fuel/oil tanks are indicated by the following
illustrations.
FUEL TANK CAP
OIL TANK CAP
OPERATION
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
purpose.
• Do not use used or reclaimed oil to avoid various
oiler problems.
• Use ECHO bar and chain oil.
• When ECHO bar and chain oil is not available:
Use motor oil, etc.
• Use bar and chain oil of the following grades:
SAE No. 30 .......in summer
SAE No. 10 .......in winter or when cutting
resinous trees.
• When refueling, also refill chain oil.
Choke control knob
Starter handle
Release chain brake
Chain brake
Ignition switch
START/RUN
CHOKE
WHEN THE ENGINE IS COLD
CAUTION
Make sure bar and chain are free from any
obstruction when starting the saw.
• Move chain brake le v er fully f orw ard to engage
chain brake before starting.
• Fill the fuel tank with fuel mixture.
It is not permitted to fill fuel above the shoulder
level of fuel tank.
• Fill the chain oil tank with lubricant.
Do not over fill.
• Move ignition switch to “RUN” position.
• Pull choke control knob all the way out. (Choke
position)
• 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.
• After starting the engine, pull front hand guard
towards the operator immediately. (Chain brake
RELEASED position)
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CS-370
START/RUN
PUSH
Throttle latch
Starter handle
Release chain brake
Chain brake
Ignition switch
Throttle trigger lockout
Throttle trigger
WHEN THE ENGINE IS HARD TO
START
CAUTION
Make sure bar and chain are free from any
obstruction when starting the saw.
• Move chain brake le ver fully f orw ard to engage
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, and pull
front hand guard towards the operator
immediately . (Chain brake RELEASED position)
CAUTION
1. When using throttle latch for starting, keep
the brake in brake position.
2. After starting the engine, squeeze throttle
trigger slightly to release throttle latch and
pull front hand guard towards the operator
immediately.
(Chain brake RELEASED position)
3. Do not increase engine speed while chain
brake is engaged.
4. Use the chain brake only in starting or in
emergencies.
Choke control knob
OPEN CHOKE
Release chain brake
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.
WHEN THE ENGINE IS WARM
• Move chain brake le v er fully f orw ard to engage
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.
• After starting the engine, pull front hand guard
towards the operator immediately. (Chain brake
RELEASED position)
CS-370
12
Ignition switch
Throttle trigger
STOP
RUNNING
• When engine starts, keep idling for a few
minutes.
• Set the brake lev er in the released position
before starting to cut.
• Pull throttle trigger gradually and increase
revolution of the engine .
• The chain starts running when the engine
reaches to 3,800 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 “ST O P” 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.
• Tension the chain as tight as possible, but so it
can still be pulled easily along the bar by hand.
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.
13
CS-370
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 protective device
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 o wn
safety, so don’t assume the responsibility for a
helper as well.
After you hav e learned the basic techniques of
using the saw , y our best aid will be y our 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 .
CS-370
Kickback
Start the engine, see that it is running properly.
Squeeze the trigger to open the throttle wide open
and start the cut. If the chain is properly sharpened,
the cutting should be relatively effortless.
It is not necessary to press down hard to make the
saw cut.
Pushing the saw too hard will slow the engine and
cutting will actually be more difficult.
Some material may adversely aff ect the housings
of your chain saw.
(Example palm Tree Acid, fertilizer etc.)
To avoid housing deterioration, carefully remove all
packed sawdust around clutch and guide bar area
and wash with water .
14
Direction of fall
45°
Retreat
3 m
45°
Retreat
Not this way
FELLING THE TREE
A falling tree can seriously damage anything it may
hit - a car, a house, a fence, a power-line, or
another tree.
There are ways to mak e 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
awa y from the direction of f all at a 45-degree angle
and at least 3 m from the trunk to avoid the trunk
kicking back over the stump.
Direction of fall
First cut
Notch
Second cut
One-third tree diameter
1
5 cm
Hinge
Felling cut
5 cm
3
2
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 abo v e 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 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 y our 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 kickback.
The final cut is made by drawing the saw forward in
the cut to reach the hinge.
15
CS-370
Uphill position
Finish cut
LIMBING
Limbing a fallen tree is much the same as buc king.
Never remo v e a limb from a tree while it is
supporting your weight.
When limbing, caution is the word.
Be careful of the tip touching other limbs.
Always use both hands.
Don’t cut with the saw ov erhead or the bar in a
vertical position. If the sa w should kickback, you
may not hav e enough control to pre v ent possib le
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 hea vy 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.
CS-370
First cut
DANGER
• 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 AGENCIES HAVE
ATTEMPTED TO PRESCRIBE VARIOUS
SAFETY DEVICES, BUT THE BEST
PROTECTION IS TO AVOID KICKBACK.
• COMPLY WITH THE SAFETY
PRECAUTIONS AS LISTED ON PAGE 2 OF
THIS MANUAL AND SAFETY MANUAL.
16
Kickback motion
CHAIN BRAKE OPERATION
• Set the lever in the released position bef ore
starting to cut.
• If the brake is tripped by kickback reaction, the
chain will stop immediately . Release the throttle
to avoid possib le damage to the engine or clutch.
• Do not attempt to operate the engine with the
brake engaged.
TESTING THE BRAKE
• Start the engine on a solid level surface and run
at a fast idle until warm.
Kickback
Chain brake function
When the lever is pushed forward, chain brake
instantly stops the chain.
Chain brake release
When the lever is fully pulled, toward the
operator, brake is released.
• Hold the saw firmly by the handles and
accelerate the engine to a fast idle.
• Slowly operate the chain brake le v er while
holding the saw firmly on the ground.
When the brake lev er trips, the chain should
stop.
Immediately release the throttle trigger.
WARNING
IF THE CHAIN DOES NOT STOP
IMMEDIATELY, RETURN THE SAW TO YOUR
AUTHORIZED ECHO DEALER FOR REPAIR.
NOTE
• For practice, while cutting a small tree, push
the lever forward to engage the brake.
• Confirm that the brake works properly before
each use.
• If the chain brake is clogged with wood chips,
function of the brake deteriorates a little.
Always keep the device clean.
• Do not increase engine revolution while the
chain brake is engaged.
• Use the chain brake only in starting or in
emergencies.
• When using throttle latch at starting, keep the
chain brake engaged.
And after starting the engine, release the brake
immediately.
• Never test the brake in an area where gasoline
fumes are present.
IMPORTANT
Do not allow the saw to tip forward in order to
avoid damage to the chain.
17
CS-370
END OF THE GUIDE BAR may be placed at
the height of about 35 cm.
35 cm
AUTOMATIC CHAIN BRAKE
Kickback produced from the tip of the guide bar will
trip the automatic chain brake. To make sure that
the automatic chain brake operates properly, follow
these steps:
1. Stop the engine.
2. Hold the saw with the guide bar approximately
35 cm above a wooden surf ace . 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 activate the chain brake.
IMPORTANT
When checking the operation of the automatic
chain brake, use a soft surface substance like
wood to provide the impact so the chain is not
damaged.
Rear handle should be gripped lightly with
the right hand.
Air cleaner cover
Plug
Cold weather
“storage” position
Warm weather position
WINTER OPERATION
Use the winter kit with chain saw to prev ent
carburetor trouble in winter .
• Remove air cleaner cover. Remov e plug from
warm weather position, and install into cold
weather “storage” position.
NOTE
For operation at normal temperature return the
plug to its original place. (5°C)
It causes over heating of the engine.
CS-370
18
MAINTENANCE AND CARE
Idle adjusting screw (T)
Low speed needle (L) High speed needle (H)
CARBURETOR ADJUSTMENT
Every unit is run at the factory and the carburetor is
set in compliance with Emission Regulations. In
addition, the carburetor is equipped with “H” (High
Speed) and “L” (Low Speed) needle adjustment
limiters that prev ent settings outside acceptable
limits.
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 chok e 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 midwa y betw een 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.
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 a v ailable
idle speed should be set to 2,400 - 2,900 r/min.
CAUTION
When starting, idling adjustment speed
should be adjusted not to rotate the saw
chain. Correct idle speed is adjusted 2,400 to
2,900 r/min. Or 1/4 turn CCW from the point
the chain stops moving.
When there is some trouble with the
carburetor, contact your dealer.
19
CS-370
Cleaner cover knob
Spark plug
Cylinder cover
0.6 to 0.7 mm
Air cleaner cover
Air filter cover
Air filter
AIR FILTER
• Check before ev ery 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 .
CHECK FUEL SYSTEM
• Check before ev ery 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.
SPARK PLUG
• Check periodically .
• The standard spark gap is 0.6 to 0.7 mm.
• Correct the spark gap if it is wider or
narrower than the standard gap.
• Fastening torque: 15 to 17 N·m
(150 to 170 kgf·cm).
Cylinder fins
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.
CS-370
20
Oil filter
Oil tank cap
Fuel tank cap
Fuel filter
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
• 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.
Adjusting screw
Decrease Increase
Worn : 0.5 mm
Groove
Oil hole
AUTOMATIC OILER
• The discharge volume of the automatic oiler is
adjusted to 4 mL/min approximately at 7,000 r/min,
prior to shipment from factory .
- 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 7,000 r/min)
- Do not turn the adjusting screw beyond the
maximum or minimum limit of volume
adjustment.
GUIDE BAR
• Clean before using.
- Clean the groove of the guide bar with a small
screwdriver.
- Clean oil holes with a wire.
• Check sprocket and the clutch and clean the bar
mount area before installation of thebar .
Replace either or both if worn.
SPROCKET
• The damaged sprocket will cause premature
damage or wear of saw chain.
- When the sprocket has worn out 0.5 mm or
more, replace it.
• Check sprocket when you install ne w chain.
Replace it if worn.
21
CS-370
SETTING THE SAW CHAIN
Preset tie strap
Drive link
Tie strap
Right hand cutter
Sharpen lower edge
Left hand cutter
Top plate
Side plate
Guard link
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 .
Keep the lower edge of the driv e link sharp
where indicated.
Depth guage
30°
Keep this angle
Push file as shown
90°
Hold the file horizontally
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 ®).
CS-370
22
1/5
One fifth of file diameter remains
above cutter edge
Depth gauge tool
30°
Remove until
flat with tool
Round off
the edge
Side plate angleTop plate filing angle
85°
• 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.
- Be sure to round off the front edge of the depth
gauge.
Properly filed cutters are shown in illustration.
When setting of the chain is finished, soak it in oil
and wash awa y filings completely bef ore using.
- When chain has been filed on the bar, supply
sufficient oil to it, rotate the chain slowly to wash
awa y the filings before using again.
- If the chain saw is operated with filings clogged
in the groove, the sa w 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.
50°
Top plate cutting angle Depth gauge
0.64 mm (0.025 in.)
↓↓
↓
↓↓
↑↑
↑
↑↑
↑↑
↑
↑↑
Parallel
↓↓
↓
↓↓
NOTE
These angles are referred to as Oregon 91P and
91VG.
To sharpen other follow chain manufacturer’s
instruction.
23
CS-370
CHAIN AND GUIDE BAR COMBINATION
The following combinations are recommended to the model CS-370.
Guide Bar Saw chain
Length ECHO Part No. Pitch Type Links
mm (in.) Double Guard mm (in.) (OREGON)
356 (14) 14A0CD3752 9.53 (3/8) 91P, 91VG 52
@ 406 (16) 16A0CD3757 9.53 (3/8) 91P, 91VG 57
457 (18) 18A0CD3762 9.53 (3/8) 91P, 91VG 62
@ Standard configuration
GUIDE BAR
Replacement guide bars.
The following guide bars ma y be considered to
have equivalent kic kbac k energy.
• Sprocket nose guide bars of the same length
and nose radius, same pitch and having the
same number of teeth.
• Hard nose guide bars of the same length and
nose radius as a sprocket nose bar.
SAW CHAIN
CAUTION
Do not use replacement saw chain unless it
has been designated as meeting the CSA Z
62.3 kickback performance requirements.
NOTE
LOW KICKBACK SAW CHAIN is the chain
which has met the kickback performance
requirements of CSA Z 62.3 (safety
requirements for gasoline-powered chain saws).
CS-370
24
SERVICE GUIDE
Daily or
With Each
AREA MAINTENANCE PAGE
Air Filter Clean •
Replace 20 •
Fuel Filter Clean •
Replace 21 •
Spark Plug Clean •
Replace 20 •
Cooling System Inspect/Clean 20 •
Muffler Inspect/Clean - •
Oil Filter Inspect/Replace 21 •
Sprocket Inspect/Replace 21 •
Re-Fueling
Before use
every 4 Hours use
Monthly
Every Three Months
or 100 Hours use
Six Months or
300 Hours use
Starter Rope Inspect/Replace - •
Guide Bar Inspect/Clean 21 •
Fuel System Inspect 20 •
Screws, Bolts Inspect,
and Nuts Tighten/Replace - •
Choke System Check 11 •
Ignition System Clean/Replace NO MAINTENANCE REQUIRED FOR COIL AND FLYWHEEL
IMPORTANT
Time intervals shown are maximum.
Actual use and your experience will determine
the frequency of required maintenance.
25
CS-370
TROUBLESHOOTING
Problem
Engine — hard to start Cause Remedy
— does not start
Engine Fuel at No fuel •Fuel filter clogged • Clean or replace
cranks carburetor at carburetor • Fuel line clogged • Clean
Engine • Internal engine problem • Ask your ECHO dealer
does not
crank
→→
→
→→
↓↓
↓
↓↓
Fuel at No fuel at • Carburetor •Ask your ECHO dealer
cylinder cylinder
Spark at No spark at • Ignition switch off • Turn switch on
end of end of plug •Electrical problem •Ask your ECHO dealer
plug wire wire
↓↓
↓
↓↓
Spark at No spark at • Covered with carbon • Clean or replace
plug plug • Fouled with fuel • Clean or replace
→→
→
→→
• Carburetor •Ask your ECHO dealer
→→
→
→→
Muffler wet •Fuel mixture is too rich • Open choke
→→
→
→→
with fuel • Clean/replace air filter
• Adjust carburetor
• Ask your ECHO dealer
→→
→
→→
• Spark gap incorrect •Adjust 0.6 mm to 0.7 mm
→→
→
→→
• Spark plug defective •Replace plug
Engine Dies or • Air filter dirty • Clean or replace
runs accelerates poorly •Fuel filter dirty •Clean or replace
• Fuel vent blocked • Clean
• Spark plug •Clean and adjust/replace
• Carburetor •Adjust
• Cooling system blocked • Clean
• Exhaust port/spark • Clean
arrestor screen blocked
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
26
STORAGE AFTER USE
• Inspect and adjust every part of the chain saw.
- Completely clean every part and repair if
necessary.
- Apply thin coating of oil on metal parts to
prevent rust.
• Remove chain and guide bar.
• Drain fuel tank, 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
the T OP DEAD CENTER.
• Store in a dry area, free from dust.
DO NOT STORE IN ENCLOSURE WHERE
FUEL FUMES MAY ACCUMULATE OR
REACH AN OPEN FLAME OR SPARK.
Do not lend or rent your chain saw without
the Operator’s manual and Safety manual.
NOTE
• For future reference, you should keep this
Operator’s manual and the Safety manual.
• If this Operator’s manual or the Safety manual
has become illegible through impairment or is
lost, please purchase a new one from your
ECHO dealer.
TECHNICAL DATA
CS-370
Dimension L × W × H mm 393 × 245 × 277
WARNING
CAUTION
Mass Power head, dry kg 4.5
Without chain and guide bar
Engine Type Air-cooled two-stroke single cylinder
Displacement mL (cm³) 36.3
Carburetor Diaphragm type
Magneto Flywheel magneto: CDI system
Spark plug NGK BPMR8Y
Starter Recoil starter
Power transmission Automatic centrifugal clutch
Fuel Mixture ratio 50 : 1 ratio with ECHO Power Blend™ two-stroke,
air-cooled engine oil.
89 octane unleaded. Do not use fuel containing
methyl alcohol, more than 10 % ethyl alcohol or 15 %
MTBE.
Tank capacity L 0.41
Oil Bar and chain ECHO bar and chain oil (or motor oil)
Tank capacity L 0.28
Guide bar and
saw chain
Lubrication Adjustable automatic oil pump
See page 24 for Chain and Guide Bar Combination
Standard Front hand guard, Rear hand guard,
features Anti-vibration device, Spiked bumper,
Throttle control lockout, Chain brake,
Chain catcher, Spark arrestor muffler, Kick guard
* Technical data subject to change without notice.
27
CS-370
10001001/10002001
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