Echo CS-670 User manual

OPERATOR’S MANUAL
CHAIN SAW
CS-670
CAUTION
Read Rules for Safe Operation
and Instruction Carefully
X750-002 76 2
X750 316-350 2
ECHO POWER EQUIPMENT (CANADA)
501 Newbold Street, London, Ontario Canada N6E 1K4
Printed in Japan 0504Asb 0384 ES

2
CS-670
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. A
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
manoeuve 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.
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 ©2003 All Rights Reserved.

3CS-670
This spark ignition system complies with Canadian ICES-002.
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........................................................................................... 13
MAINTENANCE AND CARE....................................................................................... 18
SETTING THE SAW CHAIN ....................................................................................... 21
CHAIN AND GUIDE BAR COMBINATION ................................................................. 23
SERVICE GUIDE ........................................................................................................ 24
TROUBLE SHOOTING ............................................................................................... 25
STORAGE AFTER USE.............................................................................................. 26
TECHNICAL DATA ..................................................................................................... 26

4
CS-670
NOMENCLATURE OF PARTS
1
2
REPLACEMENTBARANDCHAIN
PEMPLACEMENTDUGUIDEETDELACHAÎNE
GUIDE BAR P/NO. CHAINTYPE CKA
GUIDE PIECE NO. TYPE DE CHAÎNE
16” 160386001 OREGON 72L 60 28.2
20” 200387001 OREGON 72L 70 22.1
24” 240388101 OREGON 72L 81 19.2
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
protègentencas derebondissement.
Pour plus de détails, se référer à la
feuille sur les combinaisons de guide et
de chaîne du manuel de l’utilisateur.
Part Number X524-000710
CAUTION/ATTENTION
Hearingprotectorsmeetingtherequirements
ofCSA StandardZ94.2shouldbe worn.
Lesprotecteursauditifspouvantêtreporter
doiventrecontrerles normesCSA Standard
Z94.2.
Part Number 890176-39431
POURÉVITERLESREBONDISSEMENTS
1. Éviter tout contact entre le nez du
guide-chaîneetunobjet quelconque.
2. Toutcontactdunezpeutprovoquerun
mouvementbrusqueverslehautou vers
lebas etentraînerde gravesblessures.
3. Toujours employer lex deux mains
pour opérer la scie à chaîne.
Part Number X505-000460
TOAVOID 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. Alwaysuse twohands whenoperating
the chain saw.
Part Number X505-000450
CS-670
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 X503-002460
ATTENTION
Pouruntravailensécurité,respecteztoutes
les règles de sécurité et les indications du
manueld’utilisation.(Le manueld’utilisation
estdisponibilechezvotreagentECHO.)Tenez
fermementlatronçonneusedesdeuxmains.
Part Number 890324-39630
* If a decal cannot be read, a new one can be
ordered from your ECHO dealer.
5
4
7
8
10 11
12
13
14
21
16
17
18 20
3
19
15
6
22
9
23
X503-002460
X524-000710
890176-39431
890324-39630
X505-000450
X505-000460

5CS-670
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. Air cleaner cover - Covers air cleaner.
5. Rear handle (for the right hand) - Support
handle located towards the rear of the
engine housing.
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 in use.
9. Chain tension adjuster - This is 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. Guide bar - The part that supports and guide
the saw chain.
12. Bar tip guard - Anti-kickback device attached
on the bar nose.
13. Saw chain - Chain, serving as a cutting tool.
14. Spiked bumper - Device, fitted in front of the
guide bar mounting point, acting as a pivot
when in contact with a tree or log.
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. Manual oil pump - Device for proper
lubrication of chain.
21. Throttle trigger - Device activated by the
operator’s finger, for controlling the engine
speed.
22. Throttle trigger lockout - A safety lever which
must be depressed before the throttle trigger
can be activated in order to prevents the
accidental operation of the throttle trigger.
23. Ignition switch - Device for connecting and
disconnecting the ignition system and thus
allowing the engine to be started or stopped.

6
CS-670
HOT HUMID WEATHER
• Heavy protective clothing can increase
operator fatigue which may lead to heat
stroke.
Schedule heavy work for early morning, or late
afternoon hours when temperatures are cooler.
VIBRATION AND COLD
• It is believed that a condition called
Raynaud’s Phenomenon, which affects the
fingers of certain individuals, may be brought
about by exposure to vibration and cold.
Exposure to vibration and cold may cause
tingling and burning followed by loss of color and
numbness in the fingers.
The following precautions are strongly
recommended because the minimum exposure
which might trigger the ailment is unknown.
• Keep your body warm, especially the head and
neck, feet and ankles and hands and wrists.
• Maintain good blood circulation by performing
vigorous arm exercises during frequent work
breaks and also by not smoking.
• Limit the number of hours of operation.
Try to fill each day with jobs where operating the
chain saw, or other hand-held power equipment
is not required.
• If you experience discomfort redness and
swelling of the fingers, followed by whitening and
loss of feeling, consult your physician before
further exposing yourself to cold and vibration.
REPETITIVE STRESS INJURY
• It is believed that overusing the muscles and
tendons of the finger, hands, arms and
shoulders may cause soreness, swelling,
numbness, weakness and extreme pain to the
areas just mentioned.
Certain repetitive hand activities may put you at
a high risk for developing a repetitive stress
injury (RSI).
• An extreme RSI condition is Carpal Tunnel
Syndrome (CTS) which could occur when your
wrist swells and squeezes a vital nerve that runs
through the area. Some believe that prolonged
exposure to vibration may contribute to CTS.
CTS can cause severe pain for months or even
years.
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
repetitivemovement.
• 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 have long legs, DO NOT WEAR
SHORTS.
Do not wear loose fitting clothing, scarves,
neckties, jewelry or any item that may become
tangled in surrounding growth or the trimmer
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.
OPERATOR SAFETY

7CS-670
CORRECT USE OF CHAIN BRAKE
WARNING 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.
Canada : CSA Standard Z 62.1,
Standard Z 62.3 CHAIN SAWS
USA : ANSI Standard B175.1-2000
Safety Requirement for chain saws
WARNING DANGER
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.
SPARK ARRESTOR MUFFLER
• The spark arrestor muffler controls the exhaust
noise and prevents hot, glowing particles of
carbon from leaving the muffler.
Make sure the spark arrestor screen is in good
repair and properly seated in the muffler.
• Certain internal combustion engines operated on
forest, brush, and/or grass-covered areas in the
states of Washington, Oregon, Idaho, California
Minnesota, New Jersey and Maine, are required
to be equipped with a spark arrestor.
This requirement also applies to all U.S. Forest
Service lands.
In some of these areas, the spark arrestor
system must be certified per USDA Forest
Service Regulation SAE J 335.
Check with your local or state authorities for
specific regulations in your area.
Failure to follow these requirements is a violation
of the law.
Liner kickback
Rotational kickback
Chain moving downward at impact
Rotational kickback
Reduced radius
belongs on top
Pinch
Kickback

8
CS-670
PREPARATION FOR USE
CAUTION
• All adjustment, should be made cold.
• Always wear gloves when working on chain.
MOUNTING GUIDE BAR AND
CHAIN
• Install the spiked bumper on the front of
machine.(Use two bolts 5 ×12 mm)
KICK GUARD®TO BAR
INSTRUCTIONS
Tools Needed:Two 11 mm (7/16 in)Wrenches.
For saws with Kick Guard®P/N 28932 and
Symmetrical Low-Kick type (Double Guard)
guide bars.
1. Install bolt (A) in front 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 flush against guide bar.
4. Tighten nut (F) 1/8 additional turn.
5. Check to make certain Kick Guard®is tight on
guide bar.
Bolt (A)
Dimple (D)
Recess (E)
Front hole (C)
Front hole (B)
Nut (F) Guide bar
Kick Guard®
Two bolts 5 ×12 mm
Spiked bumper

9CS-670
• Mount bar and slide toward clutch to make saw
chain installation easier.
• Install saw chain as shown.
Be sure chain is in groove of sprocket and guide
bar.
NOTE
Move chain brake lever fully rearward to install
clutch cover to saw.
• Install the clutch cover tighten nuts finger tight.
Ensure that chain tension adjuster fits into bar
hole and rear locating tab of cover is located
properly.
ADJUSTMENT, CHAIN TENSION
• Turn the adjuster screw clockwise until the chain
touches the bottom of the bar.
• Hold the bar nose up and turn the adjuster
clockwise until the chain fits snugly against the
underside of the bar.
• Tighten both nuts with the bar nose held up.
• Pull the chain around the bar by hand.
Loosen the adjustment if you feel tight spots.
• Start the engine and run at low speed.
Stop and readjust if necessary.
Bar hole
Clutch cover
Adjusting screw
Proper tension Improper tension

10
CS-670
FUEL STATEMENT
GASOLINE-Use 89 Octane [(R+M)/2] gasoline or
gasohol known to be good quality.
Gasohol may contain maximum 10 % ethyl (grain)
alcohol or 15 % MTBE (methyl teriary-butyl ether).
Gasohol containing methyl (wood) alcohol is not
approved.
TWO-STROKE OIL - Use 50 :1 two-stroke ECHO
oilonly.
Engine problems due to inadequate lubrication
caused by failure to use 50 :1 ECHO oil will void
the warranty on your ECHO product.
MIXING - Mix oil and gasoline/gasohol according to
the instructions on the ECHO oil label.
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.
Stored two-stroke fuel may separate.
ALWAYS shake fuel container thoroughly before
each use.
CHAIN LUBRICANT
Proper lubrication of the chain while in operation
reduces friction between the chain and the guide
bar to a minimum and assures a longer service life.
• Use ECHO bar and chain oil of high quality
for this purpose.
• Do not use used or reclaimed oil to avoid
various oiler problems.
• When refueling, also refill chain oil.
FUEL AND LUBRICANT
WARNING 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
REFUELLING.
• INSPECT FOR FUEL LEAKAGE.
IF FUEL LEAKAGE IS FOUND, DO NOT
START OR OPERATE UNIT UNTIL
LEAKAGE IS REPAIRED.
Fuel Mix Chart 50 : 1
(US) (METRIC)
GAS OIL GAS OIL
Gal Fl oz L mL
1 2.6 4 80
2 5.2 8 160
5 12.8 20 400
OIL TANK CAP
FUEL TANK CAP
CAP INDICATION
Fuel/oil tanks are indicated by the following
illustrations on the caps.
Oil
Gasoline
1
50

11 CS-670
OPERATIONOPERATION
WHENTHE ENGINE IS COLD
• 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.
• Press front hand guard forward. (Chain brake
ACTIVATED position)
• Turn ignition switch upside.(“RUN”position)
• Pull choke control knob all the way out.(Choke
position)
CAUTION
Make sure bar and chain are free from any
obstruction when starting the saw.
• Make sure guide bar and saw chain are not
touching anything when starting the saw.
• 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.
• When engine starts, immediately pull throttle
trigger up to release throttle latch, then release
throttletrigger.
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.
WHENTHE ENGINE IS WARM
• Confirm fuel and chain oil in the tanks.
• Press front hand guard forward. (Chain brake
ACTIVATED position)
• Turn ignition switch upside.(“RUN”position)
• Make sure guide bar and saw chain are not
touching anything when starting the saw.
• Securely hold the chain saw as shown and pull
starter handle.
• Choke may be used if necessary but after first
firing sound, pull throttle trigger a little to release
throttle latch and choke.
Chain brake
Choke
Open
Starter handle
Start/Run
Start/Run
Ignition switch

12
CS-670
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.
CAUTION
Do not operate with a loose chain.
CHECKING CHAIN TENSION
• Chain tension should be checked frequently
during work and corrected of necessary.
• Tension the chain as tight as possible, but so it
can still be pulled easily along the bar by hand.
NOTE
When engine does not stop, pull choke control
knob out fully to stop engine. Check and repair
ignition switch before starting the engine again.
STOPPING
• Release throttle trigger and turn ignition switch
down.(“STOP”position)
RUNNING
• When engine starts, keep idling for a few
minutes.
• Set the brake lever 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.
• Give several strokes to manual oiler button and
conjunction,too.
• Do not run the engine at high speed
unnecessary.
• Be sure that saw chain stops moving when
throttle trigger is released.
Manual oiler
Stop
Ignition switch

13 CS-670
CUTTING INSTRUCTION
GENERAL
CAUTION
Read the ECHO “CHAIN SAW SAFETY
MANUAL” included with your chain saw for
additional cutting and safety instructions.
In all circumstances the operation of the chain saw
is a one-man job.
It is difficult at times to take care for your own
safety, so don’t assume the responsibility for a
helper as well.
After you have learned the basic techniques of
using the saw, your best aid will be your own good
common sense.
The accepted way to hold the saw is to stand to the
left of the saw with your left hand on the front
handlebar and your right hand on the rear handle
so you can operate the throttle trigger with your
right index finger.
Before attempting to fell a tree, cut some small logs
or limbs.
Become thoroughly familiar with the controls and
the responses of the saw.
Start the engine, see that it is running properly.
Squeeze the trigger to open the throttle wide open
and start the cut.If the chain is properly sharpened,
the cutting should be relatively effortless.
It is not necessary to press down hard to make the
saw cut.
Pushing the saw too hard will slow the engine and
cutting will actually be more difficult.
Some material may adversely affect the housings
of your ECHO chain saw.
(Example palmTree Acid, fertilizer etc.)
To avoid housing deterioration, carefully remove all
packed sawdust around clutch and guide bar area
and wash with water.
CAUTION
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!
SEE OPERATOR’S MANUAL INSERT FOR
INSTALLATION AND USE WITHTHE KICK
GUARD.
Kickback

14
CS-670
1
2
3
Felling cut
Hinge
Direction of fall
First cut
Notch
Second cut
One-third tree diameter
5 cm
5 cm
FALLING THE TREE
A falling tree can seriously damage anything it may
hit - a car, a house, a fence, a power line, or
another tree.
There are ways to make a tree fall where you want
it, so first decide where that is!
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 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 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 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 kickback.
The final cut is made by drawing the saw forward in
the cut to reach the hinge.
LIMBING
Limbing a fallen tree is much the same as bucking.
Never limb on the tree that you are standing.
When limbing, caution is the word.
Be careful of the tip touching other limbs.
Always use both hands.
Direction of fall 45°
45°
Not this way
Retreat
Retreat
3 m

15 CS-670
CAUTION
Wear suitable hearing protective device such as
earmuffs or earplugs to protect against
objectionable or uncomfortable loud noises.
Don’t cut with the saw overhead or the bar in a
vertical position.If the saw should kickback, you
may not have well enough control to prevent
possible injury.
BUCKING
Bucking is the sawing of a log or fallen tree into
smallerpieces.
There are a few basic rules which apply to all
buckingoperations.
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
sequenceshown.
The first cut should be no deeper than one-third the
trunk diameter.
WARNING 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 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.
Uphill position
Finish cut
First cut

16
CS-670
CHAIN BRAKE OPERATION
• Set the lever in the released position before
starting to cut.
• If the brake is tripped by kickback reaction, the
chain will stop immediately release the throttle to
avoid possible damage prevent 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.
• Hold the saw firmly by the handles and
accelerate the engine to a fast idle.
• Slowly operate the chain brake lever while
holding the saw firmly on the ground.
When the brake lever trips, the chain should
stop.
Immediately release the throttle trigger.
CAUTION
Do not allow the saw to tip forward in order to
avoid damage to the chain.
If the chain does not stop immediately, return the
saw to your authorized ECHO dealer for repair.
NOTE
• For practice, while cutting a small tree, push
the lever forward to engage the brake.
• At all the time, confirm whether the brake works
properly before each work.
• 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.
• Chain brake is used in emergencies.
Do not use it unless absolutely necessary.
• When using throttle latch at starting, keep the
chain brake position.
And after starting the engine, release the brake
immediately.
• Never test the brake in an area where gasoline
fumes are present.
Chain brake function
When the lever is pushed forward, chain brake
instantly work to stop the chain.
Chain brake release
When the lever is fully pulled, toward the
operator, brake is released.
Kickback
Kickback motion

17 CS-670
AUTOMATIC CHAIN BRAKE
The automatic chain brake stops the operation of
the saw chain in such a manner that kickback
action produced at the end of the guide bar
automatically actuates the chain brake.
To make sure that the automatic chain brake
operates properly, proceed as follows:
1) Stop the engine of the chain saw.
2) Operate the front and rear handles with hands
(grip them lightly), so that the guide bar may be
placed at the height of about 35 cm as shown in
Fig.
3) Softly detach the left hand from the front handle,
and touch the end of the guide bar against the
wood or the like placed below so that the
machine receives an impact.
(* At this time the rear handle should be gripped
lightly with right hand.)
4) The impact is propagated to the brake lever,
which actuates the chain brake.
(PRECAUTION)
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.
END OF THE GUIDE BAR may be placed at
the height of about 35 cm.
35 cm
Rear handle should be gripped lightly with
the right handle.

18
CS-670
MAINTENANCE AND CARE
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 Needle) and “L” (Low Speed Needle) needle
adjustment limited that prevent settings outside
acceptable limits.
1. Before adjusting carburetor clean or replace air
filter and muffler, “Spark Arrestor Screen”.
2. Make sure the cutting attachments such as bar
and chain are properly adjusted.
3. Start engine and run several minutes to bring to
operating temperature. Flash choke twice during
warm-up to clear any air from the fuel system.
4. Stop engine.
Turn “H” speed needle counterclockwise (CCW)
to stop.
Turn “L” speed needle midway between full
clockwise (CW) stop and CCW stop.
5. Idle Speed Adjustment:
• Start engine, turn “Idle” speed adjustment
screw CW until the saw chain begins to turn,
then turn screw out CCW until the saw chain
stops turning.
Turn screw out, CCW, an additional 1/4 turn.
6. Accelerate to full throttle for 2 - 3 seconds to
clear any excess fuel in the engine, then return
to idle.
Accelerate engine to full throttle to check for
smooth transition from idle to high speed.
If engine hesitates turn “L” needle CCW 1/8 turn
and repeat acceleration.
Continue adjustment until smooth acceleration
results.
7. Check idle speed and reset if necessary as
described in item 5. If a tachometer is available
idle speed should be set as specified in the
InstructionManual.
WARNING DANGER
CUTTING ATTACHMENT MUST NOT TURN
OR MOVE WHEN UNIT IS IDLING.
CAUTION
When starting, idling adjustment speed should
be adjusted not to rotate the saw chain.
Correct idle speed is adjusted 2,900 to 3,100
r/min.
Or 1/4 turn CCW from the point the chain stops
moving.
When there is some trouble with the carburetor,
refer to your dealer.
Idle adjusting screw (T)
High speed needle (H) Low speed needle (L)

19 CS-670
0.6 to 0.7 mm
AIR FILTER
• Check before every use.
• Off the cleaner cover latch, and remove air
cleaner cover and air filter.
• Brush off dust lightly, or clean with compressed
air, or replace the air filter.
• Reinstall filter and cover, engage latch.
CHECK FUEL SYSTEM
• Check before every use.
• After refueling make sure fuel does not leak or
exude from around fuel pipe, fuel grommet or
fuel tank cap.
• In case of fuel leakage or exudation there is a
danger of fire.Stop using the machine
immediately and request your dealer to inspect
or replace.
MAGNETO
• The unit has CDI (Capacitor Discharge Ignition)
system, which does not require adjustment of
ignitiontiming.
• Check for secure (tight) wire connections.
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.
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
Cleaner cover latch
Air cleaner cover
Air filter
Cylinder cover
Air filter cover
Spark plug
Air cleaner cover
Cleaner cover latch

20
CS-670
Brake band
Adjuster
Direction
to tension
↓↓
↓↓
↓
↑↑
↑↑
↑
1 mm
Mark
Adjusting brake band
Adjuster
Brake band
Cover
FUEL FILTER
• Checkperiodically.
• Do not allow dust to enter fuel tank.
• 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.
•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.
AUTOMATIC OILER
• The discharge volume of the automatic oiler is
adjusted to 8 mL/min approxmately at 7,000
r/min, prior to shipment from factory.
- To increase the delivery volume, turn the
adjusting knob clockwise.
When the knob touches stopper and stops,
this position indicates maximum discharge
volume.(15 mL/min at 7,000 r/min)
- Do not turn the adjusting knob beyond the
maximum or minimum limit of volume
adjustment.
ADJUSTING THE CHAIN BRAKE
When brake band is worn or elongated, adjust the
location of adjuster peak as follows.
• Remove the clutch cover.
• Remove the cover and side plate.
• Turn adjuster position to set its peak to the
correcttensioninglocation.
• Ensure that clutch drum can be turned freely by
hand when brake handle is in cutting position
(release position).
CAUTION
ECHO recommends that an authorized ECHO
servicing dealer should service the chain brake.
Oil filter
Fuel filer
Oil cap Fuel cap
Decrease
Increase
Adjusting knob