Echo TYPE1-E CSG-670 User manual

OPERATOR’S MANUAL
ENGINE CUT-OFF SAW
CSG-670
TYPE1-E
WARNING
Read the instructions carefully and follow the rules for safe
operation.
Failure to do so could result in serious injury.
X750-007 46 3
X750 410-440 3
ECHO, INCORPORATED
400 Oakwood Road, Lake Zurich, Illinois 60047-1564
Phone : [phone]
Printed in Japan 0710k 1244 ES

2
CSG-670 TYPE1-E
WARNING
Some dust created by power sanding, sawing, grinding, drilling, and
other construction activities contains chemicals known to the State of
California to cause cancer, birth defects or other reproductive harm.
Some examples of these chemicals are:
• Lead from lead-based paints,
• Crystalline silica from bricks and cement and other masonry products,
and
• Arsenic and chromium from chemically treated lumber.
Your risk from these exposures varies, depending on how often you do
this type of work. To reduce your exposure to these chemicals: work in a
well ventilated area, and work with approved safety equipment, such as
those dust masks that are specially designed to filter out microscopic
particles.
INTRODUCTION
The ECHO model CSG-670 TYPE1-E Cut-off Saw
is a high-performance gasoline-powered tool
designed for use with a recommended 305 x 3.2 x
20 mm (12 in. x 1/8 in. x 25/32 in.) abrasive wheel.
A water-flush attachment is available for dust
control.
Use only ECHO’s wheels or other wheels having a
minimum spindle speed rating of 6000 r/min or
higher.
This manual provides the information necessary for
assembly, operation and maintenance of the cut-off
saw as well as the wheels available for it.
It is important that you follow this information
carefully.
WARNING
Improper use or care of this unit, or failure to
wear proper protection can result in serious
injury.
Read the rules for safe operation and
instructions in this manual.
Wear eye and hearing protection and a dust
mask when operating.
CONTENTS
Introduction ........................................... 2
Symbols and Signs ............................... 3
Description ............................................ 4
Definition of Terms ................................ 5
Operator Safety Precautions ................. 6
Preparing for Use .................................. 8
Abrasive Wheel Types and Uses .......... 10
Operation .............................................. 14
Troubleshooting Cutting Problems ........ 18
Troubleshooting Engine Problems ........ 18
Maintenance and Adjustment ................19
Storage after Use ..................................24
Specifications ........................................24
Specifications, descriptions and illustrations in this manual were accurate at the time of publication, and
are subject to change without notice. Illustrations may include optional equipment and accessories, and
may not include all standard equipment.
© 2004, ECHO, Incorporated
The engine exhaust from this
product contains chemicals known
to the State of California to cause
cancer, birth defects or other
reproductive harm.
WARNING

3CSG-670 TYPE1-E
SYMBOLS AND SIGNS
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.
CIRCLE AND SLASH
SYMBOL
This symbol means the specific
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.
DECALS
Locate this safety decal on your unit.The complete
unit illustration found in the “DESCRIPTION”
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.
DANGER
Always cut at wide open throttle
and with the wheel fully up to
speed. Failure to do so may cause
premature belt or wheel wear.
1. Read and understand your operator’s manual before
using this product.
2.Use only ECHO approved cutting accessories.
3. Always wear proper safety equipment as outlined in
your operator’s manual.
4.Do not twist or overload the wheel while cutting.
5. For a copy of the operator’s manual, contact your
ECHO dealer or ECHO, INC., 400 Oakwood Rd.,
Lake Zurich, IL 60047-1564.
Part Number 890188-07060
Part Number 890178-07060
Part Number 890160-07060
DANGER — Read and follow
all safety precautions in operator’s
manual. Failure to do so could result
in serious personal injury.
Part Number X503-006280
CSG–670
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. IMPORTANT
The enclosed message provides information
necessary for the protection of the unit.

4
CSG-670 TYPE1-E
DESCRIPTION
Part Number 890188-07060
Arbor Adapter
Part Number 611022-07061
25.4 mm diameter, 6.5 mm thickness
Part Number V361-000190
25.4 mm diameter, 1.6 mm thickness
Tool Kit
Wheel Shield
Wheel
Wheel
Mounting Bolt
Outer Flange
Wheel Blotter
Rubber Spark/Dust Shield Fuel Cap Ignition Switch
Throttle Trigger
Throttle
Latch
Metal Foot
Choke Knob
Starter Grip
Air Cleaner Cover Nut
Front Handle
Air Cleaner Cover
Throttle Lockout
Rear Handle
Idle Speed Adjusting Knob
Rear Arm Cover
Arm Mounting Nuts
Wheel Shield Locking Knob
Front Arm Cover
Muffler
Cap Over Arbor
Part Number X503-006280
Part Number 890178-07060
Part Number 890160-07060

5CSG-670 TYPE1-E
DEFINITION OF TERMS
ANSI – American National Standards Institute.
Arbor – A spindle or axle.
Arbor Hole – The mounting hole in the abrasive
wheel.
Automatic Belt Tensioner – This feature, a spring-
loaded device in the wheel arm, maintains belt
tension.
Blotters – Discs of soft material placed between
wheel and mounting flanges to equalize
pressure against the wheel, and to avoid wear
on the flanges if slipping occurs.
Chaps – Protective covers for the legs.
Choke Control – The device used to enrich the
fuel/air mixture when starting the engine.
Cold Start – Starting sequence required whenever
engine is not warm enough from previous
operation to be started without choking.
Drop-Start – An improper variation of starting while
holding saw in the air. Do not start saw in the air.
Dust Mask – A device worn to prevent breathing in
dust.
Engine Speed – The speed of the engine output
shaft.
Face Shield – A device worn in front of the eyes,
and all or part of the face, to supplement the
protection afforded by a primary protective
device.
Gasohol – Gasoline containing methyl alcohol
(methanol) or more than 10 % of ethyl alcohol
(ethanol) that is harmful to internal engine parts.
Goggles – A device, with impact-resistant lenses,
intended to protect the eyes from the front, top
and sides. The goggles are stamped Z 87 for
qualification.
Governor – A device which limits the speed of the
engine.
Idle Speed – An engine speed which is slow
enough that the clutch does not engage.
Ignition Seitch – The device which allows the
operator to run or stop the engine.
Kickback – A dangerous reaction and movement
off the saw, in an upward arc towards the
operator, caused by contact with an object at
the front segment of the wheel.
No Load Speed – The speed of the engine when
no load is applied.
Reduction Ratio – The ratio between the engine
speed and the spindle speed.
Reinforced Wheel – Abrasive wheels bonded on
both sides with layers of a fiber mesh material.
Spindle – An axle or arbor.
Spindle Speed – The speed at which the spindle
or wheel axle rotates.
Throttle Latch – A device used to latch the throttle
trigger in a position for starting the engine.
Throttle Trigger Lockout Lever – A lever on the
rear handle grip which the operator must hold
depressed for control of the throttle trigger, and
when released will lock the throttle control in the
idle position.
Throttle Trigger – The device in the rear handle
used to control the speed of the engine.
Two-Stroke Fuel – Fuel containing the lubricant for
two-stroke engines. It is made by mixing 2-
stroke engine oil with gasoline.
Water-Flush – Constantly spraying the stone or
masonry surface during cutting, in order to
reduce exposure to dust, and also cool the
wheel.
Wheel Guard – A wheel shield which is intended to
protect the operator from wheel contact, and
also direct debris away from the operator.
Wheel Speed – The speed (r/min) of the shaft
(spindle, arbor) on which the cutting wheel is
mounted.
Wheel Speed Rating – The speed printed on the
label of the wheel by the manufacturer is the
maximum allowable wheel speed.
Wheel Thrust – The force of the wheel against the
work, felt by the operator as a pull of the saw.

6
CSG-670 TYPE1-E
Read this cut-off saw operator’s manual carefully. Be sure you understand
how to operate this saw properly before you use it.
Establish a training program for cut-off saw operators.
Use safety footwear, snug-fitting clothing and protective gloves.
Wear eye, hearing and head protection devices. Use ballistics chaps or
pants when necessary. Clothing of fire-resistant and unmeltable material
should be worn by emergency crews exposed to flames or high heat
conditions.
Use caution when handling fuel. Put the gas caps back tightly on both the
gas can and the saw tank, move at least 3 m (10 feet) from the fueling point,
and be sure there is no leakage of fuel from the gas cap or the fuel system
before starting the engine. Avoid ignition from sparks.
DANGER
After refueling tighten fuel cap firmly and check for leakage. In case
of fuel leakage repair before starting operation since there is a
danger of fire.
IMPORTANT
zCheck before every use.
zAfter refueling, make sure fuel does not leak from around fuel pipe, fuel
grommet or fuel tank cap.
zIn case of fuel leakage there is a danger of fire. Stop using the machine
immediately and request your dealer to inspect or replace.
zIt is not permitted to fill fuel above the shoulder level of fuel tank.
Operate this gasoline engine saw only in well-ventilated areas.
Do not cause sparks in any area where there are flammable materials.
Start the saw on the ground with the cutting wheel completely in the clear.
Do not drop-start the saw, or start it if the wheel is obstructed by the ground
or any other object.
Do not allow other persons to be nearer than 9 m (30 feet) when you are
starting or cutting with the saw. Be aware that bystanders should wear
hearing and eye protection. Do not start cutting unless you have good
footing and the work area is clear.
Do not let someone hold the work you are cutting.
Adjust the wheel shield to a position where the sparks and debris from the
wheel will be thrown away from you. Do not operate if the wheel shield is
damaged, missing from the unit, improperly positioned, or cannot be locked
in proper position.
Keep a firm grip on the saw with both hands, the right hand on the rear
handle, and the left hand on the front handle when the engine is running.
Use a firm grip with thumbs and fingers encircling the saw handles. A firm
grip will help you to keep control if the saw kickback toward you, or the
thrust of the rotating wheel pulls it away from you. Never operate the saw
with only one hand.
OPERATOR SAFETY PRECAUTIONS
3 m (10 feet)
Adjust Wheel Shield

7CSG-670 TYPE1-E
Keep to the left of the saw so that no part of your body is in line with the
cutting wheel. Keep all parts of your body away from the cutting wheel when
the engine is running.
Do all cutting at full throttle speed. Cutting at less than full speed can
damage the clutch by allowing it to slip. Accelerating from slow to full speed
while the wheel is in cutting contact may cause a violent push or pull
reaction resulting in loss of control.
It will take time for the wheel to coast to a stop after the throttle trigger is
released. Be sure to wait for rotation to stop before releasing your grip on
the saw handles. Always shut off the engine before setting down the saw.
Always carry the saw with the engine stopped and the hot muffler away from
your body. Do not touch a hot muffler or cylinder.
Remove the wheel from the saw prior to transport or storage. Store wheels
properly to avoid damage from uneven pressure, moisture and extreme
temperatures.
Do not grind on the side of an abrasive cut-off saw wheel, or put any side
pressure on the wheel during cutting. Avoid letting the saw tilt or wobble off
line.
Use new, properly qualified wheels of correct diameter, thickness and
mounting hole size. The wheel blotters and the mounting flanges should be
in good condition, and the mounting bolt should be tightened to the proper
torque.
Inspect the wheel carefully for cracks, edge damage and warping before
use. Do not use any wheel that has been dropped.
All items of adjustment and maintenance given in this operator’s manual
should be performed as necessary, and may be done by the saw owner. AII
required items of service or adjustment not listed in this manual should be
performed only by a qualified ECHO servicing dealer.
Over speeding of the engine, or wrong size pulleys in the belt transmission
can result in dangerously high wheel speeds. Install only the proper
diameter pulleys in the belt transmission. The engine no load maximum
speed is controlled by a vibration-sensitive governor. Check speed with a
tachometer, or contact your ECHO dealer if you suspect the governor is not
working properly.
Keep to Left of
Cutting Line
Put no Side
Pressure on
the Wheel
Check for Wheel
Damage

8
CSG-670 TYPE1-E
Spectators children and fellow workers must be
warned to come no nearer than 9 m (30 feet) while
the saw is in use. Shut off the saw immediately if
some one moves closer to you than 9 m (30 feet).
Persons working in the area near you should wear
the same protective equipment as the saw
operator if endangered by risky flying debris.
PREPARING FOR USE
PROTECTIVE EQUIPMENT
WARNING
Cut-off saw users risk injury if the saw is
used improperly, and/or safety precautions
are not followed. Protective clothing and
safety gear must be worn when operating a
cut-off saw.
zYou must wear eye protection goggles qualified
to the latest ANSI Standard Z 87. (Z 87 is
stamped on the goggles). These goggles also
must be worn under a face screen if one is
used. A face screen should be worn when there
is a risk from flying debris.
zHearing protection should be worn. (See
“DANGER” page 16)
zWear a respirator or dust mask when cutting
concrete, stone, brick or other materials where
fine dust is produced while cutting. Use water
flush to keep down the dust.
zClothing should be made from fabric containing
natural fibers that resist catching fire and do not
melt. The clothing should cover as much skin
area as possible. Clothing should offer freedom
of movement, but should not be too loose or
baggy. Do not wear ties or jewelry.
zWear heavy duty boots with non-slip soles. The
boots should be high enough for shin protection,
or you should wear chaps for shin protection.
zWear non-slip, heavy duty work gloves to
improve your grip on the saw handles. The
gloves also help to reduce the transmission of
machine vibrations to your hands.
Hard Hat
No Bystanders!
Hearing Protection
Goggles (Z 87)
Dust Mask or Respirator
Trim-Fitting Protective
Clothing
Heavy Duty non-Slip
Gloves
Chaps or High Boots for
Spark Protection
Heavy Duty Boots
With non-Slip Soles
PROTECTING OTHERS

9CSG-670 TYPE1-E
PHYSICAL CONDITION
Your judgment and/or dexterity may be impaired if
you are ill or have taken alcohol or other
substances known to affect the way you would
function normally. Operate only when sound in
mind and body.
WARNING
PRECAUTIONS AGAINST VIBRATION AND
COLD
It is believed that a condition called
Raynaud’s Phenomenon which affects the
fingers of certain individuals is brought
about by exposure to cold and vibration.
Accordingly, your ECHO Cut-off Saw has
shock mounts designed to reduce the
intensity of vibration received through the
saw handles. Exposure to cold and vibration
may cause tingling and burning, followed by
loss of color and numbness, in a person’s
fingers. We strongly recommend your taking
the following precautions because the
minimum exposure which might trigger the
ailment is unknown.
zz
zz
zKeep your body warm – especially head,
neck, feet and ankles, and hands and
wrists.
zz
zz
zMaintain good blood circulation by
performing vigorous arm exercises during
frequent work breaks, and also by not
smoking.
zz
zz
zLimit the number of hours of cut-off saw
operation. Try to fill a part of each work
day with jobs where operating this saw or
other hand-held power tools are not
required.
zz
zz
zIf you experience discomfort, redness and
swelling of the fingers, followed by
whitening and loss of feeling, consult your
physician before exposing yourself further
to cold and vibration.

10
CSG-670 TYPE1-E
Prim Use
General purpose mild and
stainless steel: re-bar, pipe
and structural steel
Ductile or cast Iron and
concrete lined pipe
Heat treated, wear hardened
and alloyed steel
All masonry, concrete and
stone products and asphalt
Rock, block, stone, tile
Engine Drive Pully
10000 r/min ± 500 r/min
= between 4750 and
5250 r/min
Wheel Speed
ABRASIVE WHEEL TYPES AND USES
ECHO Wheels are labeled for the type of materials they are designed to cut. The types of wheels
identified below, and other types, may be available from ECHO dealer.
Labeled Application
Metal
Ductile
Rail Track
Masonry
Diamond Wheel
Other Uses
Aluminum and soft
brass. Does not cut
non-metals very well
AII except very hard
metals
Not for non-metals
Not for metals
Not for metal or
reinforced concrete
ECHO REINFORCED WHEELS WHEEL SPEED RATING
The speed rating printed on these reinforced wheels could range from 6000
to 6300 r/min. This is the minimum acceptable wheel speed rating for this
unit. Wheels rated less than 6000 r/min must not be used on this saw.
Read Label on the
Wheel
MAXIMUM ALLOWABLE WHEEL SPEED
The wheel rotates at the same speed as the spindle (arbor) on which it is
mounted. The wheel must never be allowed to rotate faster than 6000 r/min
if the wheel speed is rated at 6000 r/min. (See “Engine Speed and Wheel
Speed”, below.)
ENGINE SPEED AND WHEEL SPEED
Since the reduction ratio of the engine drive pulley to the large driven pulley
is about 2 to 1, the wheel speed will be half whatever the engine drive pulley
speed is.
The unit has a governor system designed to govern the engine high speed,
at no load, to within 500 r/min of 10000 r/min, at which the wheel speed
should range between 4750 and 5250 r/min. – safety inside the 6000 r/min
limit. If the engine exceeds this speed limit, take it to your nearest ECHO
servicing dealer for service.
Dry or Water Flush
Dry
Dry. Does not cut
well when wet
Dry
Constant Water
Flush or Dry
Dry

11 CSG-670 TYPE1-E
Blotter 108 mm (41/4in.)
20 mm
(25/32 in.)
305 mm (12 in. Dia.) Refer to Chart
Abrasive Wheel:
Diamond Wheel:
Wheel Dimensions
Wheel Dia.
305 mm (12 in.)
305 mm (12 in.)
Mounting Hole Dia.
20 mm (25/32 in.)
20 mm (25/32 in.)
Thickness
3.2 mm (1/8 in.)
2.7 mm (0.106 in.)
WHEEL BLOTTERS AND MOUNTING FLANGES
Wheel blotters attached to both sides of reinforced
wheels are cushions needed to equalize the
pressure of the mounting flanges from wear if
slippage between the wheel and the flanges
occurs. The blotters are 108 mm (41/4in.)
diameter. Take care that the blotters do not
become gouged or deeply scratched and that
there is no foreign material on them when
mounting the wheel.
EMERGENCY APPLICATIONS
The cut-off saw has applications in fire fighting and
rescue work. An ECHO QUIK-VENT roof venting
saw is also available. Both of these units, however,
can cause sparks and should not be used in an
explosive atmosphere or where they could start a
fire.
WARNING
zz
zz
zDo not grind with a cut-off wheel or put
pressure on the sides.
zz
zz
zDo not mount wheel if blotters are
damaged. Do not destroy cushioning
effect by making mounting bolts too tight.
Never fasten while applying your weight.
Otherwise the thread could be broken.
Proper torque is 20 N•m (15 ft. lbs.).
zz
zz
zExamine wheel carefully before use. Do
not use if wheel is warped, damp, cracked,
chipped or cutting area shows heat
discoloration.
zz
zz
zA wheel once dropped cannot be trusted.
Discard a wheel if you drop it.
RING TESTING WHEELS
Cracks or defects in a wheel may not be visible. To help in verifying that a
wheel is ok to use, a “ring test” must be made immediately before mounting
all new or used wheels.
Put your finger through the mounting hole to support the wheel. Use a non-
metallic handle of any small tool or a small piece of wood to lightly tap (do
not hit) the wheel in the locations shown in the illustration. Do not tap wheel
on the edge. Uncracked wheels will make a ringing sound, wheels with
cracks or concealed cracks will make a dull “clunk”.
IMPORTANT
If a wheel being “ring tested” is dirty or damp or
is tapped at the vertical center line, the resulting
sound will be muffled and not reliable.
“Tap” Here
Center Line
45°
45°
45°
45°
* Mounting hole dia.; 25.4 mm (1.0 in.) with adapter
Abrasive wheel adapter; Thickness 6.5 mm
Diamond wheel adapter; Thickness 1.6 mm

12
CSG-670 TYPE1-E
FACTS ABOUT ABRASIVE WHEELS
ECHO wheels are made by laying a strong fiber mesh material into a form,
pouring a mixture of resin and the abrasive grit particles over the mesh, and
adding a second layer of mesh over the mixture. Then the resin and
reinforcing mesh are bonded together and cured.
The wheel’s ability to cut certain materials are due to the type abrasive, size
of the grit and it’s spacing. The reinforcement on both sides adds strength
and rigidity.
Always read the label on the wheel. If the wheel does not cut well, it may be
the wrong type for the material. Forcing it to cut may result in shattering of
the wheel and serious injury to the operator.
WARNING
Do not grind with a cut-off wheel or put pressure on the sides.
Use only ECHO reinforced wheels, or wheels approved for this saw
by ECHO. Wheels that are too thick or fit the arbor improperly may
shatter, causing serious personal injury. So may wheels of low speed
rating or those that are cracked, wrapped, out-of-round or edge-
damaged.
A wheel can stand a lot of cutting pressure as long as the pressure is
straight on and not from the side of the wheel. This is why you always must
make only straight line cuts, by avoiding saw tilt or wobbling off line during a
cut.
Saws intended for forcible entry should be equipped with new wheels for
each use. If the used wheels can pass the ring test (page 11) and close
inspection, they may be use in training emergency crews.
Check every wheel for warping, cracks and broken edges before mounting
on the saw.
Warped wheels do not cut properly and may be stressed to the point of
breaking. Always store your wheels sown flat on a smooth, flat and dry
surface. When stacking many wheels, place cardboard or paper spacers
between them as a cushion.
Moisture and heat both can cause wheel damage. Do not let wheels lie in
the sun or expose them to high heat. Keep wheels dry at all times, and store
in an area of low humidity and moderate temperature. Protection from
moisture damage applies during water-flush cutting. To keep water from
penetrating the wheel, bring wheel up to cutting speed before turning on
water, and maintain wheel rotation for 10 seconds after shutting off water.
HANDLING AND STORAGE OF WHEELS
Put No Side
Pressure On
the Wheel

13 CSG-670 TYPE1-E
HOW TO INSTALL THE WHEEL
1. Remove the cap from the arm for access to the shaft at front of the arm.
2. Two combination (17 mm, 19 mm) box wrenches are supplied. Use one
wrench to keep shaft from turning. Unscrew wheel mounting bolt with the
other wrench or your fingers.
3. Remove wheel bolt, washers and outer flange, leaving inner flange place.
Mount wheel on arbor between the two flanges. Install flat washer, lock
washer and wheel bolt. Tighten bolt securely and snap cap in place.
WARNING
zz
zz
zBefore tightening, check that flanges are properly seated and not
cocked on the mount or bolt threads. Do not make bolt so tight as
to destroy the cushion supplied by the wheel blotters. Never fasten
while applying your weight. Otherwise the thread could be broken.
Do not tighten more than 20 N•m (15 ft. lbs.).
zz
zz
zInner and outer flanges are not interchangeable. Reversing
positions may cause wheel damage and lock the wheel.
NOTE
Arm may be removed and remounted with wheel on the outboard side of
the arm as required for certain procedures. See page 19 for details.
25.4 mm Arbor Adapter
Remove Cap
Remove Wheel Bolt,
Washers and Outer
Flange
Box Wrench
13×19 mm
Box Wrench
17×19 mm
Cutting
Wheel
Snap Cap in Place
Inner Flange
Tighten
Wheel with Blotters
Wheel Bolt
Arm
Inner Flange
Outer Flange
Flat Washer
Lock Washer
Shaft
V-Velt
Pulley

14
CSG-670 TYPE1-E
OPERATION
2-STROKE FUEL
(50 : 1 RATIO) ECHO OIL
zUse a mixture of 50 parts unleaded regular grade gasoline (minimum
octane 89) and one part 50 : 1 ECHO 2-stroke Oil (2 %).
Do not use fuel containing methyl alcohol or more than 10 % of ethyl
alcohol.
1. Pour 1/2 of the gasoline into a safe container.
2. Add oil to the gasoline and mix them.
3. Add remaining gasoline and mix again.
4. Install fuel cap and wipe spilled fuel from saw, container and the area.
IMPORTANT
Do not mix fuel in engine fuel tank.
WARNING
Alternative fuels, such as E-20 (20 % ethanol), E-85 (85 % ethanol) or
any fuels not meeting above 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, carburetor and other engine components.

15 CSG-670 TYPE1-E
STARTING AND STOPPING
SAFE STARTING TECHNIQUES
IMPORTANT
zCheck unit for loose nuts, bolts and screws before starting.
zAlways clear work area of debris before starting operation.
zAlways hold the unit firmly.
zWhen pulling starting rope, use short pulls, 1/2 to 2/3 of rope length.
zDo not allow the starter grip to snap back against the housing.
Set saw down on level ground with wheel or saw blade in the clear. Grasp
front handle with left hand, and hold down rear handle with toe of your boot.
Never “drop-start” the saw.
WARNING
Wheel will rotate when engine is started at latched throttle setting.
Keep cutting wheel in the clear.
STARTING COLD ENGINE
1. Pull out choke all the way.
2. Move ignition switch to “RUN” position.
3. Depress and hold throttle trigger and lockout
while pushing in latch button to latch throttle for
starting.
4. Crank engine. Pull starter grip briskly, but only
1/2 to 2/3 its full length. Pulling rope to the end
may damage the starter.
5. Push in the choke the first time engine fires, and
crank until engine starts and runs. In cold
weather you should keep the choke out just a
little until the engine gets very warm. But, do not
operate with the choke out.
6. Squeeze and release trigger when engine runs.
You now have trigger control of the throttle
speed.
3
Depress and Hold
Both Throttle Trigger
and Lockout Lever,
and Push in Latch
Button, then Release
Trigger
1
Pull out Choke
2
Move Switch to “RUN”
6
To De-latch Throttle,
Squeeze and Release
the Trigger
4
Pull Starter Grip

16
CSG-670 TYPE1-E
1. Squeeze and release trigger to unlatch it and take control of the throttle.
2. Let engine warm to operating temperature before doing any cutting.
3. Take cutting stance on left side of saw. Never get any part of your body
behind the saw. Hold the saw firmly with both hands. Throttle up to cutting
speed and make gentle wheel contact with the work.
STOPPING ENGINE
Move ignition switch down to “STOP” position. Keep wheel in the clear until
all movement stops.
If engine does not stop, pull choke control knob out fully to stop engine. The
choked engine will slow to a stop. Be sure to keep the wheel in the clear
until all movement stops.
RESTARTING WARM ENGINE
WARNING
With trigger latched, wheel will rotate as soon as engine starts. Keep
wheel in the clear.
Wheel will rotate for some time after the trigger is released. Keep
wheel in the clear until all movement stops.
When engine is warm from previous running, move ignition switch to “RUN”
position. And push choke control knob all the way in. Try cranking at idle
throttle without latching it. If this does not work, try again with throttle
latched. Choking may be needed if the engine has cooled. But, to avoid the
possibility of over-choking and flooding, always first try to start a warm
engine without choking it.
SEQUENCE AFTER STARTING ENGINE
CUTTIING ASPHALT, TAR AND REINFORCED MATERIALS
Old, cold and hardened asphalt paving can be cut with a masonry wheel
with good results and little trouble with tarring of the wheel. Fresh asphalt
and tarred surfaces can gum up the wheel and slow its cutting action. Some
tar or resin-impregnated materials also may present problems of this sort.
Masonry containing metal reinforcement is best cut with a masonry wheel
which can cut through the reinforcing steel better than a wheel designed for
metal can cut the masonry. Expect faster than normal wheel wear.
Wheel Thrust
DANGER
zz
zz
zDo not raise saw above chest height, because the saw is hard to
control when held up high, and dust or sparks will fall on you.
zz
zz
zWear hearing protection. Without it you risk hearing loss,
especially where bounce-back of sound waves off nearby surfaces
increases the noise.
zz
zz
zDo not take awkward or risky operating positions. Find solid
footing for both feet, and always hold the saw firmly with both
hands. Never make one-handed cuts.
zz
zz
zWhen the wheel engages the work, the thrust will exert a forward
pull which you must be ready to control. Keep bystanders out of
the way.

17 CSG-670 TYPE1-E
CUTTING TECHNIQUE
The main objectives are to avoid overheating the
wheel, and to prevent it from being pinched or
trapped or stressed in any way.
zAdjust position of wheel guard to direct the
discharge away from you.
zPrepare to make straight cuts only. Use a snap-
line to mark long cuts, and follow the marked
line carefully.
zTake a balanced, comfortable stance on the left
side of the saw. Hold saw firmly with both
hands.
zAlways throttle up to cutting speed before letting
the wheel make contact. The saw may be jerked
forward, causing loss of control, if wheel is in
contact during throttling up. Carefully let cutting
edge of wheel make light contact with the work.
Do not push or bounce the wheel onto the work.
Hold saw steady. Do not let it tilt or wobble.
zDo not let the wheel stop in one place, but keep
it moving - in one direction, or back and forth,
along the line of cut. Cutting in one spot causes
heat build-up which can damage or glaze the
wheel. Too much cutting pressure also causes
overheating.
zCut as shallow and straight a groove as you
can. If you cut a curve, the wheel will start to
bind as the cut deepens.
zGo over and over the groove you have started
until the cut is completed.
zOn cuts of long duration, remove saw from cut
often to let the wheel cool.
zNever put any side pressure on a cut-off saw
wheel, grind on the side of it or use it to flick
away debris.
zWhen cutting large diameter pipe, cut 360
degrees around and try not to cut through. If a
large segment of the wheel breaks through, the
wheel may catch and kick out at lightning-fast
speed.
zBefore cutting materials which are not supported
along their entire length, provide support to
prevent binding. Also be aware that the top
section will settle on the wheel if a column is cut
in two.
NOTE
Always cut at full throttle. Cutting at less than full
throttle may harm the clutch as it will overheat
during slippage.
DANGER
Do not cut with the portion of the wheel
running from just below horizontal to just
past top dead center. This is the zone of
contact where the saw is likely to be kicked
upward and backward towards you.
Follow Snap Line
Keep Wheel
Moving
Cut in a
Straight Line
Saw Will Bind in
Crocked Cut
Roll Pipe to Cut
360° Around
Try Not to Let Wheel
Break Through in One
Place
Kickback
Danger Zone

18
CSG-670 TYPE1-E
TROUBLESHOOTING CUTTING PROBLEMS
Trouble
Wheel stops when cutting pressure
is applied
Belt slips and cannot be tensioned
properly
Poor cutting - wheel discolored at
outer area
Probable Cause
1. Bearing down too hard.
2. Binding in crooked cut.
3. Binding in closing cut.
4. Loose V-belt.
Belt worn beyond the limit.
Heat damage.
Remedy
1. Ease up cutting pressure.
2. Lay out and follow a straight line.
3. Support material so cut will open.
4. Increase belt tension.
Replace V-Belt.
Replace wheel. Do not cut long in
one spot. Water flush when
recommended.
TROUBLESHOOTING ENGINE PROBLEMS
Trouble
Engine will not start
Engine hard to start
Engine misses
Engine overheats and/or stalls under
cutting load
Probable Cause
1. Out of fuel.
2. Switch not on.
3. Engine flooded.
4. Fuel strainer clogged.
5. Air filter blocked.
6. Spark plug fouled or
cracked.
7. Ignition magneto or
spark plug wire faulty.
1. See reasons under “Will
Not Start”.
2. Water in fuel or fuel has
gone stale or sour.
3. Engine not getting the
proper fuel/air mixture.
4. Carburetor out of
adjustment.
1. Dirt in carburetor or fuel
line.
2. Carburetor out of
adjustment.
3. Weak or intermittent
spark.
1. Not enough oil.
2. Air passages around
cylinder clogged.
3. Carburetor main
adjustment is set too
“Lean”.
Remedy
1. Fill fuel tank.
2. Move switch to “RUN” position.
3. Remove spark plug. Turn switch
off and crank engine to expel the
fuel. Install clean, dry, properly
gapped spark plug.
4. Install clean fuel strainer. Check
that fuel pick-up line is not leaking
or clogged. Clean fuel tank.
5. Clean or replace air filter element.
6. Replace plug.
7. Contact nearest authorized ECHO
servicing dealer.
1. See remedies above.
2. Fill tank with clean, fresh fuel
mixture.
3. If over-choked and flooded,
remove plug and crank engine
before installing clean, dry plug. If
not choked enough, set controls
properly for starting.
4. See “Carburetor Adjustment” or
seek authorized dealer for
adjustment.
1. Contact nearest authorized
servicing dealer.
2. Adjust, or seek dealer service.
3. Contact nearest authorized
servicing dealer.
1. Use proper amount of oil in fuel
mixture.
2. Clean air intake grid on starter
side, flywheel, cylinder fins and
surrounding area.
3. See “Carburetor Adjustment” or
seek authorized dealer for
adjustment.

19 CSG-670 TYPE1-E
MAINTENANCE AND ADJUSTMENT
V-BELT CHANGE AND ADJUSTMENT
1. Move ignition switch down “STOP” position.
2. Remove wheel shield adjusting knob, the lock
washer and two flat washers.
3. Remove rear arm cover and front arm cover.
(Save the seven screws.)
4. Use the 13 mm end of the box wrench to loosen
arm mounting nuts just a little.
5. Remove belt tension (with 10 mm open end
wrench) by turning the nut counterclockwise as
far as it will travel.
6. Push arm towards small pulley. Pull belt off
pulley at point (B) and slip new belt onto large
pulley. At point (A), start belt over the rim and
onto the small pulley.
7. Turn the tension adjusting nut clockwise finger
tight. Then reinstall the covers. Turn the adjusting
nut until a part of the spring seat is hidden by the
forward edge of the peep window.
8. Lightly swing the tip of the arm up and down
several times. This sets the tension automatically.
9. Tighten the arm mounting nuts fully, and reinstall
the wheel shield adjusting knob.
REMOUNTING ARM FOR FLUSH CUTTING
When necessary to cut up close to a barrier, invert and remount the arm so
the wheel is on the outboard side.
1. Refer to “V-belt Change and Adjustment” to remove the belt. This time,
remove the arm mounting nuts, the long plate and the two spacer washers.
2. Use the parts removed in step one to remount the arm – this time in the
inverted position.
3. Push the wheel shield and arm through loop of the V-belt. Follow
instructions to mount and tension the V-belt.
4. Reinstall all parts previously removed, and tension the belt.
Long Plate
Rear Arm Cover
Front arm Cover
Shield Adjusting Knob
Large Pulley (B)
V-Belt BANDO ORC 850
Arm Mounting Nuts
Spacer Washer
10 mm Wrench
Small Pulley (A)
Peep Window
Spring Seet
Peep Window

20
CSG-670 TYPE1-E
Pleated Main Filter
Nylon Mesh Third Filter
Foam First Filter
Air Cleaner Base Plate
AIR FILTER
Air Cleaner Cover
Dust from cutting must be prevented from entering
the engine. The three (3) filters in the Air Cleaner
System can do this if they are properly maintained
and correctly installed. The foam, first filter when
used dry should be removed and cleaned each
time the fuel tank is refilled. If the foam filter is oiled
[recommended to prolong main (paper) filter life],
cleaning may be required more frequently if a
noticeable drop in power due to a clogged air filter
is noted.
Bolts
Wing Nut
IMPORTANT
Excess oil will contaminate the paper (main)
filter, shortening its life.
1. Close the choke (pull out knob) before removing the air cleaner cover to
prevent debris from entering the carburetor.
2. Loosen the wing nut and remove air cleaner cover.
3. Before removing the filters, clean the accumulated dust from the filters and
air cleaner base plate with a soft brush or by gently blowing (Do not use
compressed air).
4. The third (nylon mesh) filter should be removed only when cleaning is
necessary. When re-installing, be sure filter base is properly installed in the
rubber connector.
5. Clean the foam (first) filter and nylon (third) filter in water/detergent
solution. Wrap the foam filter in a clean cloth and squeeze (Do not wring)
dry.
6. If foam (first) filter is to be oiled, soak it in clean 20W or 30W engine oil.
Again wrap the filter in a clean dry cloth and squeeze (Do not wring) until
the filter appears dry.
7. Clean the main filter by gently tapping filter flat against a flat surface. Do
not brush or wet the paper, harsh cleaning methods will damage the filter.
Fasten firmly the main filter mounting bolts.
8. Examine all three filters for cracks or tears. Replace any filter that is, or
appears, clogged or damaged after cleaning.