Echo CSG-7410 User Manual

OPERATOR’S MANUAL ENGINE CUT-OFF SAW

CSG-7410

WARNING

The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.

Cancer and Reproductive Harm

www.P65Warnings.ca.gov

WARNING

Read the instructions carefully and follow the rules for safe operation. Failure to do so could result in serious injury.

ECHO, INCORPORATED

400 Oakwood Road, Lake Zurich, Illinois 60047-1564 Phone : 847-540-8400

Printed in USA

X7503954100

INTRODUCTION

The ECHO model CSG-7410 Engine Cut-off saw is a high-performance gasoline-powered tool designed for use with a recommended 350 x 4.7 x 20 mm (14 in. x 6/32 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 3820 rpm or higher. This manual provides the information necessary for assembly, operation and maintenance of the cutoff saw as well as the wheels available for it. It is important that you follow this information carefully.

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.

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.

Breathing in asbestos ﬁbers can pose a serious health risk and may cause severe or fatal respiratory diseases such as lung cancer. Do not use your engine cut-off saw to cut, damage, or disturb asbestos or products using asbestos in any form. If you believe you might be cutting asbestos, contact your employer immediately.

CONTENTS

Introduction ............................................ 2

Symbols and Signs ................................ 3

Packing List ........................................... 5

Nomenclature of Parts ........................... 6

Operator Safety Precautions ................. 8

Operator Safety ..................................... 10

Abrasive Wheel Types and Uses ........... 12

Preparation for Use ............................... 15

Fuel and Lubricant ................................. 18

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.

CSG-7410

2018

Emission Data ....................................... 20

Operation ............................................... 20

Cutting Instruction ................................. 23

Maintenance and Care .......................... 24

Troubleshooting ..................................... 31

Storage After Use .................................. 32

Technical Data ....................................... 34

Warranty Registration Sheet .................. 34

Notes ..................................................... 35

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.

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.

Decals

CIRCLE AND SLASH SYMBOL

This symbol means the speciﬁc action shown is prohibited. Ignoring these prohibitions can result in serious or fatal injury.

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.

Locate the safety decals on your unit. The complete unit illustration found in the “NOMENCLATURE OF PARTS” section will help you locate them. Make sure the decal is legible and that you understand and follow the instructions on it. If a decal cannot be read, a new one can be ordered from your ECHO dealer.

CSG-7410

SYMBOL FORM

Symbol form/shape Symbol description/application Symbol form/shape Symbol description/application

WARNING!! Read and follow all safety precaution in the Operator's Manual. Failure to follow instructions could result in serious personal injury.

Always wear an ear mufﬂer, a dust proof mask, goggles and a helmet when operating this machine. (ANSI Z87.1)

Choke control

Oil and gasoline mixture

Do not run the engine indoors, or where there is poor ventilation.

Cutting may cause sparks from the cut-off wheel. Make sure there is no ﬂammable substance nearby.

Kickback may force the cutting-off wheel up and back toward the operator with a lightning-fast reaction. Kickback can occur whenever the upper-half of the cutting-off wheel touches an object while operating the machine.

Usage of saw blades not permitted.

Make sure there are no breaks,cracks or warps.

Wheel rorating direction Max spindle speed

Purge pump

Decompression device

Carburetor adjustment

- Low speed mixture

Carburetor adjustment

- High speed mixture

CSG-7410

Emergency stop

Keep away from ﬁre.

Carburetor adjustment

- Idle speed

PACKING LIST

The ECHO product you purchased has been factory pre-assembled for your convenience. Due to packaging restrictions, wheel installation and other assembly may be necessary.

ECHO engine cut-off saw

Operator's manual

OPERATOR’S MANUAL ENGINE CUT-OFF SAW

CSG-7410

WARNING

Read the instructions carefully and follow the rules for safe operation. Failure to do so could result in serious injury.

ECHO, INCORPORATED

400 Oakwood Road, Lake Zurich, Illinois 60047-1564 Phone : 847-540-8400

Printed in USA

X750 395-410 0

Warranty sheet

• •

After opening the carton, check for damage. Immediately notify your retailer or ECHO dealer of damaged or missing parts. Use the packing list to check for missing parts.

13 x 19 mm T-wrench

Bar tool

Adapter (25.4 mm)

Coupler

Wheel

CSG-7410

NOMENCLATURE OF PARTS

OPERATOR’S MANUAL ENGINE CUT-OFF SAW

CSG-7410

Read the instructions carefully and follow the rules for safe operation. Failure to do so could result in serious injury.

ECHO, INCORPORATED

400 Oakwood Road, Lake Zurich, Illinois 60047-1564 Phone : 847-540-8400

Printed in USA

WARNING

X750 395-410 0

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. Front handle (for the left hand) - Support handle located at the front of the engine housing.

3. Wheel guard - A wheel guard which is intended to protect the operator from wheel contact, and also direct debris away from the operator.

4. Wheel - Serving as a cutting tool.

5. Wheel mouting bolt - Bolt that secures the

ﬂange.

6. Cutter ﬂange - Part that secures the cutting wheel.

7. Fuel tank cap - For closing the fuel tank.

8. Momentary stop switch - Button for momen-

tarily shorting ignition voltage, causing the engine to stop. This is NOT an ON/OFF Ignition switch.

9. Throttle trigger - Device activated by the operator’s ﬁnger, for controlling the engine speed.

10. 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.

11. Choke control knob - Device for enriching the fuel/air mixture in the carburetor to aid cold starting. Also activates fast idle throttle latch.

12. Starter grip - 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.

13. Air cleaner cover - Covers air cleaner.

14. Rear handle (for the right hand) - Support

handle located towards the rear of the engine housing.

15. Water kit - Supplies water while cutting to keep dust from scattering.

16. Clutch cover - Protective belt and clutch when the engine cut-off saw is in use.

17. Arm mounting bolts - Secures the cut-off saw.

18. Pulley Cover - Protects the belt and pulley.

19. Wheel guard locking knob - For use when

changing the angle of the wheel guard.

Wheel guard knob - Grip and move this knob

20.

when changing the angle of the wheel guard.

21. Spark arrestor mufﬂer - The spark arrestor mufﬂer controls the exhaust noise and prevents hot, glowing particles of carbon from leaving the mufﬂer.

22. Decompression device - Device for lowering the compression in the cylinder, to aid starting.

23. Safety labels - Device for lowering the compression in the cylinder, to aid starting.

CSG-7410

OPERATOR SAFETY PRECAUTIONS

Read this engine 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 engine cut-off saw operators.

OPERATOR’S MANUAL ENGINE CUT-OFF SAW

Read the instructions carefully and follow the rules for safe operation. Failure to do so could result in serious injury.

ECHO, INCORPORATED

400 Oakwood Road, Lake Zurich, Illinois 60047-1564 Phone : 847-540-8400

Printed in USA

3 m

WARNING

CSG-7410

X750 395-410 0

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 non-meltable material should be worn by emergency crews exposed to ﬂames or high heat conditions.

Use caution when handling fuel. Put the fuel tank caps back tightly on both the fuel container and the saw tank, move at least 3 m (10 ft.) from the fueling point, and be sure there is no leakage of fuel from the fuel tank cap or the fuel system before starting the engine. Avoid ignition from sparks.

DANGER

After refuelling, tighten fuel cap ﬁrmly and check for leakage. In case of fuel leakage repair before starting operation since there is a danger of ﬁre.

WARNING

Do not run the engine indoors, or where there is poor ventilation. Engine fumes contain deadly poisonous carbon monoxide.

IMPORTANT

Check before every use.



After refuelling, 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.

It is not permitted to ﬁll fuel above the shoulder level of fuel tank.



Adjust Wheel guard

Wheel guard locking knob

CSG-7410

Operate this gasoline engine cut-off saw only in well-ventilated areas.

Do not store the unit with fuel in its tank, because a fuel leak could start a ﬁre.

Do not cause sparks in any area where there are ﬂammable materials.

Start the engine cut-off saw on the ground with the cutting wheel completely in the clear. Do not drop-start the engine cut-off saw, or start it if the wheel is obstructed by the ground or any other object.

Do not allow other persons to be closer than 9 m (30 ft.) when you are starting or cutting with the saw. 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 guard to a position where the sparks and debris from the wheel will be thrown away from you. Turn the wheel guard locking knob counterclockwise, grasp the wheel guard knob and move the wheel guard to the desired position, slowly release it and secure the wheel guard with the locking knob. Do not operate if the wheel guard is damaged, missing from the unit, improperly positioned, or cannot be locked in proper position.

Keep to Left of

Cutting Line

Keep a ﬁrm grip on the engine cut-off 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 engine cut-off saw with only one hand.

Be careful around electrical cables, sewer and gas lines to avoid cutting them.

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. 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.

Never leave the engine cut-off saw while the engine is running.

Put no Side Pressure on the Wheel

Check for Wheel

Damage

Always carry the saw with the engine stopped and the hot mufﬂer away from your body. Do not touch a hot mufﬂer, wheel, cylinder cover or cylinder.

Do not touch high voltage parts such as spark plug and spark plug lead.

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 engine 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 adjustment and maintenance instructions in this operator’s manual should be performed as necessary, and may be done by the saw owner. All other service or adjustment should be performed only by a qualiﬁed ECHO servicing dealer.

CSG-7410

OPERATOR SAFETY

Protective Equipment

WARNING

Engine 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 engine cut-off saw.

Hard Hat

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

You must wear eye protection goggles qualiﬁed



to the CE mark or 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.

Hearing protection should be worn. (See



“DANGER,” page 23)

Wear a respirator or dust mask (APF10) when



cutting concrete, stone, brick or other materials where ﬁne dust is produced while cutting. Use water ﬂush to keep down the dust.

Clothing should be made from fabric containing



natural ﬁbres 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 jewellery.

Wear heavy duty boots with non-slip soles. The



boots should be high enough for shin protection, or you should wear chaps for shin protection.

Wear 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.

Heavy Duty Boots with non-Slip Soles

Protecting Others

No Bystanders!

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.

CSG-7410

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 Engine 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 colour 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.

Keep your body warm – especially head,



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 engine 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.

If 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.

CSG-7410

ABRASIVE WHEEL TYPES AND USES

ECHO Reinforced Wheels

ECHO Wheels are labelled 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.

WARNING

This saw includes an abrasive wheel and a water system.



Do not use water with an abrasive wheel.



Labeled Application Primary Use Other Uses Dry or Water Flush

General purpose mild and

Metal

Ductile

Rail Track

Masonry

Diamond Wheel Rock, block, stone, tile

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

Aluminum and soft brass. Does not cut non-metals very well

AII except very hard metals

Not for non-metals Dry

Not for metals

Not for metal or reinforced concrete

Dry

Dry. Does not cut well when wet

Constant Water Flush or Dry

Dry

Wheel Speed Rating

This is the minimum acceptable wheel speed rating for this unit. Wheels rated less than 3820 rpm must not be used on this engine cut-off saw.

Read Label on The

Wheel

Maximum Allowable Wheel Speed

The wheel rotates at the same speed as the spindle (arbour) on which it is mounted. The wheel must never be allowed to rotate faster than 3820 rpm if the wheel speed is rated at 3820 rpm.

CSG-7410

Wheel Blotters and Mounting Flanges

Blotter 108 mm

20 mm

(25.4 mm)

350 mm

Abrasive Wheel: 350 mm (13.8 in.)

Diamond Wheel: 350 mm (13.8 in.)

Refer to Chart

Wheel Diameter Mounting Hole Diameter Thickness

Emergency Applications

Do not grind with a cut-off wheel or put pressure on the sides.



Do 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 25 N•m (250 kgf•cm) - 30 N•m (300 kgf•cm).

Examine wheel carefully before use.



Do not use if wheel is warped, damp, cracked, chipped or cutting area shows heat discolouration.

Dropping a wheel can easily damage it.



Discard a wheel if you drop it.

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 (4 1/4 in.) 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.

Wheel Dimensions

20 mm

(25.4 mm with Adapter)

20 mm

(25.4 mm with Adapter)

Max. 4.7 mm (6/32 in.)

WARNING

Ring Testing Wheels

Centre Line

45°

“Tap” Here

45°

Cracks or defects in a wheel may not be visible. To help in verifying that a wheel is OK to use, a “ring test”. Perform the ring test immediately before mounting all new or used wheels.

Put your ﬁnger through the mounting hole to support the wheel. Use a nonmetallic 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. Wheels without cracks 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 centre line, the resulting sound will be mufﬂed and not reliable.

CSG-7410

Facts About Abrasive Wheel

ECHO wheels are made by laying a strong ﬁbre 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.

Do not use water with an abrasive wheel.

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 arbour improperly may shatter, causing serious personal injury. So may wheels of low speed rating or those that are cracked, warped, out-of-round or edge-damaged.

WARNING

Put no Side Pressure on the Wheel

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.

Saws intended for forcible entry should be equipped with new wheels for each use. If the used wheels can pass the ring test (page 13) and close inspection, they may be use in training emergency crews.

Handling and Storage of Wheels

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 laying ﬂat, on a 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.

CSG-7410

PREPARATION FOR USE

How to Install the Wheel

Replacing the Adapter

Install the adapter that ﬁts the inside diameter of the cutting wheel. When shipped, an adapter with an outside diameter of 20 mm is mounted. If the inside diameter of the cutting wheel to be used is 25.4 mm, replace the adapter as follows.

1. Insert the bar tool.

2. Rotate the drive shaft until the hole in the large pulley and the bar tool aligned.

Bar Tool

3. Unscrew wheel mounting bolt with the 19 mm end of the box wrench or your ﬁngers. Remove wheel bolt and outer ﬂange, leaving inner ﬂange in place.

4. The adapter is held to the drive shaft with a snap ring. Insert a tool like a small slotted screwdriver in the gap and remove the snap ring.

Adapter

Bar Tool

Snap ring

Flange

Bolt

Adapter

5. Replace with an adapter that ﬁts the inside diameter of the cutting wheel to be used.

6. Press the snap ring in until it reaches the groove in the drive shaft and secures the adapter. If the snap ring is deformed, replace it with a new one.

Installing a Cutting Wheel

1. Insert the bar tool. Rotate the drive shaft until the hole in the large pulley and the bar tool aligned.

2. Unscrew wheel mounting bolt with the 19 mm end of the box wrench or your ﬁngers.

3. Remove wheel bolt and outer ﬂange, leaving inner ﬂange in place.

4. Conﬁrm the direction of rotation of the cutting wheel and mount it so its centre hole ﬁts over the adapter mounted on the drive shaft.

Cutting Wheel

Tighten

5. Align the hole in the cutter ﬂange with the drive shaft and press it on.

6. Finger tighten the wheel bolt and then tighten it fully with a socket wrench. Tighten it to a torque of 25 to 30 N･m.

7. Remove the bar tool and rotate the cutting wheel by hand; make sure it is straight and wobble-free.

CSG-7410

Before 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. Do not use pneumatic, electric-powered tools or one’s body weight for tightening. Otherwise the thread could be broken. Do not tighten more than 30 N•m (300 kgf•cm).

NOTE

Arm may be removed and remounted with wheel on the outboard side of the arm as required for certain procedures.

Adjusting the Wheel Guard Angle

WARNING

Wheel guard knob

Never operate the machine without the wheel guard in place.



1. The wheel guard can be adjusted to prevent debris from ﬂying off and hitting the

operator.

2. Turn the wheel guard locking knob counterclockwise, grasp the wheel guard

knob and move the wheel guard to the desired position, then slowly release it and

Wheel guard

Locking knob

secure the wheel guard with the locking knob.

* Never operate the machine without the guard stopper in place.

Reverse Mounting the Cutter Arm

When shipped the cutting wheel is mounted so it is near the center of gravity of the machine. The cutting wheel can be moved to a position outside the machine by reverse mounting the cutter arm.

Reverse mounting the cutter arm compromises the balance of



Pipe

the machine and makes it difﬁcult to operate. Do not use it in the reversed state except when necessary.

WARNING

Guard Stopper

Wheel guard knob

Nozzle

CSG-7410

1. Remove the cutting wheel.

2. Remove the 2 screws and remove the guard stopper.

3. Remove both of the pipes connected to the pipe connector. Remove the pipe

connector after removing the nut mounted on the wheel guard.

4. Mount the pipe connector in the lower hole in the wheel guard.

Pipe connector

5. Loosen the nut that holds the nozzle in place.

6. Remove the wheel guard knob mounted on the wheel cover.

Locking Knob

7. Loosen the nut of the locking knob and reinstall it after changing the angle of

the knob.

8. Change the angle of the wheel guard.

Tension screw

Cutter arm

Pulley cover

Belt

Pulley

Bolt

9. Loosen the tension screw until its tip cannot be seen, then remove the 2 pulley

cover bolts.

10. Remove the pulley cover.

11. Remove the cutter arm from the crankcase. Remove the belt at the same time.

12. Reverse the cutter arm and mount it in the long hole in the crankcase.

13. Put the belt on the pulley.

14. Put the pulley cover into the cutter arm. Make sure the pulley cover is not mis-

aligned when putting it into the arm.

15. Finger tighten the 2 pulley cover bolts, then back them off about 1 turn. Adjust

the tightness of the belt.

16. Tighten the 2 pulley cover bolts. Note: Tighten it to a torque of 23 to 27N･m (230

to 270 kgf･cm).

17. Change the nozzle angle and then tighten the nut.

18. Insert the 2 pipes into the pipe connector.

19. Mount the knob on the top of the wheel guard.

20. Install the guard stopper on the guard (above the cutting arm).

CSG-7410

FUEL AND LUBRICANT

FUEL

WARNING

Diesel fuels and alternative fuels, such as E-15 (15% ethanol), E -85 (85% ethanol) or any fuels not meeting ECHO requirements are NOT approved for use in ECHO 2-stroke gasoline engines. Use of diesel or 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. Diesel or alternative fuels may also cause premature deterioration of fuel lines, gaskets, carburetors and other engine components.

Fuel Requirements Gasoline - Use 89 Octane [R+M/2] (mid grade or

higher) gasoline known to be good quality. Gasoline may contain up to 10% Ethanol (grain alcohol) or 15% MTBE (methyl tertiary-butyl ether). Gasoline containing methanol (wood alcohol) is NOT approved. Use of ECHO brand fuel is recommended to extend engine life in all air-cooled 2-stroke and 2/4-stroke hybrid engines.

Two Stroke Oil - A two-stroke engine oil meeting ISO-LEGD (ISO/CD 13738) and J.A.S.O. FD Standards must be used. ECHO brand 2-stroke oils meet these standards. Engine problems due to inadequate lubrication caused by failure to use an ISO-L-EGD (ISO/CD 13738) and J.A.S.O. M345-FD certiﬁed oil, such as ECHO brand 2-stroke oils, will void the two-stroke engine warranty.

WARNING

2-Stroke engine oil contains petroleum distillates and other additives that may be harmful if swallowed. Heated oil can release vapors that can cause ﬂash ﬁre, or ignite with explosive force. Read and follow the oil manufacturer’s instructions, and observe all safety warnings and precautions for handling ﬂammable liquids. For more detailed safety and ﬁrst aid information, visit www.echo-usa.com for a copy of the Material Safety Data Sheet.

• KEEP OUT OF REACH OF CHILDREN.

• If swallowed, do not induce vomiting. CALL PHYSICIAN OR A POISON CONTROL CENTER IMMEDIATELY.

• WEAR SAFETY GLASSES when mixing or handling.

• AVOID repeated or prolonged skin contact

• AVOID inhaling oil mists or vapors.

NOTICE

ECHO brand 2-stroke oils may be mixed at 50:1 ratio for application in all ECHO engines sold in the past regardless of ratio speciﬁed in those manuals.

Handling Fuel

DANGER

Fuel is VERY ﬂammable. Use extreme care when mixing, storing or handling, or serious personal injury may result.

Use an approved fuel container. Mark fuel containers as containing 2-stroke mixture fuel.

• DO NOT smoke near fuel.

• DO NOT allow ﬂames or sparks near fuel.

• Fuel tanks/cans may be under pressure. Always loosen fuel caps slowly allowing pressure to equalize.

• NEVER refuel a unit when the engine is HOT or RUNNING!

• DO NOT ﬁll fuel tanks indoors. ALWAYS ﬁll fuel tanks outdoors over bare ground.

• DO NOT overﬁll fuel tank. Wipe up spills immediately.

• Securely tighten fuel tank cap and close fuel container after refueling.

• Inspect for fuel leakage. If fuel leakage is found, do not start or operate unit until leakage is repaired.

• Move at least 3 m (10 ft.) from refueling location before starting the engine.

DANGER

Gasoline vapor is heavier than air, and can travel along the ground to nearby sources of ignition such as electrical motors, pilot lights, and hot or running engines. Vapors ignited by an ignition source can ﬂash back to the fuel container, resulting in an explosion, ﬁre, serious or fatal injuries, and extensive property damage.

CSG-7410

Mixing Instructions

1. Fill an approved fuel container with half of the required amount of gasoline.

2. Add the proper amount of 2-stroke oil to gasoline.

3. Close container and shake to mix oil with gasoline.

4. Add remaining gasoline, close fuel container, and remix.

Fuel to Oil Mix – 50:1 Ratio

US Metric

Gas Oil Gas Oil

gal. ﬂ.oz. L cc

1 2.6 5 100 2 5.2 10 200 5 13 25 500

NOTICE

Stored fuel ages. Do not mix more fuel than you expect to use in 30 days, 90 days when a fuel stabilizer is added.

Stored two-stroke fuel may separate. ALWAYS shake fuel container thoroughly before each use.

Used oil and gasoline, and soiled towels are hazardous waste materials. Disposal laws vary by locality.

EMISSION DATA

EMISSION CONTROL

(EXHAUST and EVAPORATIVE)

EPA 2010 and Later and/or C.A.R.B. TIER III

The emission control system for the engine is EM (engine modiﬁcation) and, if the second to last character of the Engine Family on the Emission Control Information label (sample below) is “C”, “K”, or “T”, the emission control system is EM and TWC (3-way catalyst). The fuel tank/fuel line emission control system is EVAP (evaporative emissions). Evaporative emissions for California models may only be applicable to fuel tanks.

An Emission Control Label is located on the engine ( example only, information on label varies by engine family).

PRODUCT EMISSION DURABILITY (EMISSION COMPLIANCE PERIOD)

The 300 hours emission compliance period is the time span selected by the manufacturer certifying the engine emissions output meets applicable emissions regulations, provided that approved maintenance procedures are followed as listed in the Maintenance Section of this manual.

EMISSION CONTROL INFORMATION

ENGINE FAMILY: #EHXS.0735RA DISPLACEMENT: 73.5 cc EMISSION COMPLIANCE PERIOD: 300 Hours THIS ENGINE MEETS U.S. EPA EXH/EVP EMISSION REGULATIONS FOR MODEL YEAR **** REFER TO OWNER’S MANUAL FOR MAINTENANCE SPECIFICATIONS AND ADJUSTMENTS.

***XXXX

CSG-7410

OPERATION

Safe Starting Techniques

Set saw down on level ground with wheel in the clear. Grasp front handle with left hand, and hold down rear handle with toe of your boot. Never “dropstart” the saw.

Wheel will rotate when engine is started at fast idle throttle latch setting. Keep cutting wheel in the clear.

IMPORTANT

Check unit for loose nuts, bolts and screws before starting.



Make sure the wheel guard is securely in place.



Always clear work area of debris before starting operation.



Always hold the unit ﬁrmly.



When pulling starting rope, use short pulls, 1/2 to 2/3 of rope length.



Do not allow the starter grip to snap back against the housing.



WHEN THE ENGINE IS COLD

WARNING

Decompression device

Primer pump

Choke

Starter grip

Throttle trigger lockout

1. Fill the fuel tank with fuel mixture. It is not permitted to ﬁll fuel above the shoulder level of fuel tank.

2. Press the decompression device.

3. Push primer pump until fuel is visible in primer pump.

4. Pull out choke all the way (engages the fast idle throttle latch setting).

5. Securely hold the engine cut-off saw. Pull starter grip briskly, but only 1/2 to 2/3 its full length. Pulling rope to the end may damage the starter.

6. 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.

7. Squeeze and release trigger when engine runs to release the fast idle throttle latch setting. You now have trigger control of the throttle speed.

CSG-7410

Throttle trigger

WHEN THE ENGINE IS WARM

Starter grip

1. Fill the fuel tank with fuel mixture. It is not permitted to ﬁll fuel above the shoulder level of fuel tank.

2. Press the decompression device.

3. Securely hold the engine cut-off saw. Pull starter grip briskly, but only 1/2 to 2/3 its full length. Pulling rope to the end may damage the starter.

Choke

RUNNING

Stopping Engine

Momentary stop switch

Choke

* If the engine is hard to start, pull the choke to engage the fast idle throttle

latch setting, then return the choke to its normal position (this opens the throttle slightly).

If it still fails to start, revert to the WHEN ENGINE IS COLD starting

procedure.

1. Once the engine starts, allow it to warm up for 2 to 3 minutes at idling (i.e.

low speed).

2. Warming the engine helps to lubricate its internal workings more smoothly.

Allow the engine to warm up fully, especially when it is cold.

WARNING

Momentary stop switch automatically returns to run position. Engine can start unintentionally when starter handle is pulled. Always remove spark plug lead from spark plug before pulling starter handle, otherwise severe personal injury may result.

Release throttle trigger and allow engine to idle. Push the momentary stop switch. The engine stops with just one press of the stop switch. It is not necessary to hold the

switch until it 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.

Dust Suppression

Open

Coupler

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.

WARNING

Do not use with wheels that are not designed to be used with water-ﬂush cutting. Doing so may damage the wheel while it is being used.

1. Use water-ﬂush cutting when doing work that generates a lot of dust, such

as cutting concrete.

2. Attach a water hose with a coupler on it to the joint of the engine cut-off

saw.

3. Make sure the liquid cock is in the closed position before turning the water

faucet on.

4. Adjust the water ﬂow with the liquid cock.

5. After cutting, turn off the water and let the wheel spin itself dry.

IMPORTANT

Make sure there are no water leaks before use. Use as little water as possible to sufﬁciently suppress generation of dust.

CSG-7410

CUTTING INSTRUCTION

Sequence after Starting Engine

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.

Cutting 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.

Do 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.

Wear hearing protection. Without it you risk hearing loss,



especially where bounce-back of sound waves off nearby surfaces increases the noise.

Do 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.

Kickback safety precautions

Rotational kickback

Linear kickback

operator, resulting in serious injury

Rotational kickback



Cutting with the upper part of the cutting wheel generates kickback from the material being cut; this causes the tip of the cutting wheel to kick back from the rotation and is extremely dangerous. Always cut with the bottom of the cutting wheel.

DANGER

CSG-7410

Linear kickback



When cutting with the bottom of the cutting wheel, the machine may generate a force that pulls the machine forward. Always hold the handle ﬁrmly while working.

Cutting Technique

Keep Wheel Moving

Cut in a Straight Line

Roll Pipe to Cut 360° Around

Follow Snap Line

Saw will Bind in Crocked Cut

The main objectives are to avoid overheating the wheel, and to prevent it from being pinched or trapped or stressed in any way.

Adjust position of wheel guard to direct the



discharge away from you.

Prepare to make straight cuts only. Use a snap-



line to mark long cuts, and follow the marked line carefully.

Take a balanced, comfortable stance on the left



side of the saw. Hold saw ﬁrmly with both hands.

Always 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.

Do 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.

Cut as shallow and straight a groove as you can.



If you cut a curve, the wheel will start to bind as the cut deepens.

Go over and over the groove you have started



until the cut is completed.

On cuts of long duration, remove saw from cut



often to let the wheel cool.

Never put any side pressure on a engine cut-off



saw wheel, grind on the side of it or use it to ﬂick away debris.

When 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.

Before 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.

Try not to Let Wheel Break Through in One Place

Be careful not to cut your own legs in the



downward cutting. Be particularly careful at the end of cutting.

NOTE

Always cut at full throttle. Cutting at less than full throttle may harm the clutch as it will overheat during slippage.

CSG-7410

MAINTENANCE AND CARE

Your ECHO engine cut-off saw is designed to provide many hours of trouble free service. Regular scheduled maintenance will help your engine cutoff saw achieve that goal. If you are unsure or are not equipped with the necessary tools, you may want to take your unit to an ECHO Service Dealer for maintenance. To help you decide whether you want to DO-IT-YOURSELF or have the ECHO Dealer do it, each maintenance task has been graded. If the task is not listed ask your ECHO dealer for repairs.

SKILL LEVELS

Level 1 = Easy to do. Most required tools come

with unit.

Level 2 = Moderate difﬁculty. Some specialized

tools may be required.

WARNING

Momentary stop switch automatically returns to run position. Engine can start unintentionally. Always remove spark plug lead from spark plug before assembling or performing maintenance procedures or serious personal injury can result.

MAINTENANCE INTERVALS

Component / system Maintenance procedure

Required Skill

level

Daily or Before

use

Every refuel

Air Filter Inspect / Replace 1 I R *

Every 50 hours

or Yeary

Every 100

hours

Fuel System Inspect / Clean / Replace 1 I * I *

Fuel Filter Inspect / Replace 1 I / R *

Fuel Cap Gasket Inspect / Replace 1 I * R *

Wheel Inspect / Replace 1 I I

Wheel guard Inspect / Clean 1 I / C

Flange Inspect / Clean / Replace 1 I / C *

Belt Inspect / Tensioning / Replace 1 I I / R *

Clutch Inspect / Replace 2 I *

Spark Plug Inspect / Clean / Replace 1

Cooling System Inspect / Clean 1 I / C

Mufﬂer Spark Arrestor Inspect / Clean / Replace 2 I

Cylinder Exhaust Port Inspect / Clean / Decarbon 2 I / C

Recoil Starter Rope Inspect / Clean 2 I / C *

Screws / Nuts / Bolts Inspect / Tighten / Replace 1 I *

Maintenance Procedure Letter Codes:

I = Inspect C = Clean R = Replace

Maintenance Procedure Notes:

* = All recommendations to replace are based

on the ﬁnding of damage or wear during inspection.

When replacing parts, always use ECHO genuine parts. Using non genuine parts may result in serious injury.

IMPORTANT

Time intervals shown are maximum. Actual use and your experience will determine the frequency of required maintenance.

WARNING

I / C / R *

CSG-7410

Air Filter

The air ﬁlters of this product are designed to be maintenance-free for a long period of time. However, in the following cases the main and sub air ﬁlters should be replaced.

・If engine output drops markedly

・After 1 year or 50 hours of operation

IMPORTANT

Do not attempt to clean the main or sub air ﬁlters with compressed air.

Bolts (A)

Air Cleaner Cover

Sub air ﬁlter

Grommets

Bolt (B)

Main air ﬁlter

Filter case

Choke knob

Air Filter Replacement Procedure

1. Remove the 4 grommets on the air cleaner cover.

2. Remove the 4 bolts securing the air cleaner cover and then remove the cover.

3. Remove the main and sub air ﬁlters. The sub air ﬁlter can be removed by pulling out the choke and lifting up the ﬁlter case and then pressing on the ﬁlter from the under side.

4. Put the ﬁlter case back in position.

5. Install new sub and main air ﬁlters. Replace both ﬁlters at the same time.

6. Install the air cleaner cover and tighten its 4 bolts. Tighten the 3 bolts (A) and then the bolt (B).

7. Make sure the grommets are facing the right way when installing them on the air cleaner cover.

CSG-7410

Spark Plug

Spark plug

Spark plug lead

1. Remove air cleaner cover.

2. Remove spark plug lead.

3. Remove spark plug.

4. The proper spark plug for this engine is NGK BPMR7A. The ﬁring gap between the electrodes should be adjusted to 0.65 mm (0.026 in) before use.

5. Install the spark plug. Proper tightness with a cold engine is 17 to 19 N•m (170 to 190 kgf•cm).

6. Many failed plugs can be restored by ﬁling or scraping the electrodes down to bare metal, cleaning all deposits off the porcelain insulation around the centre electrode, then setting the gap.

0.65 mm (0.026 in)

Replace Fuel Filter

Fuel Filter

Fuel Tank Cap

WARNING

Fuel vapours 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.

(Check Periodically)

1. Do not allow dust to enter fuel tank.

2. Clogged ﬁlter will cause difﬁculty in starting engine or abnormalities in engine performance.

3. Pull the fuel ﬁlter out through fuel inlet port with a piece of steel wire or the like.

4. When the ﬁlter is dirty, replace it. Do not attempt to clean the ﬁlter.

5. When the inside of the fuel tank is dirty, rinsing the tank out with petrol can clean it.

WARNING

Check condition of fuel cap and gasket. Be sure the cap ﬁts tightly and there is no fuel leak.

CSG-7410

NOTE

Federal EPA regulations require all model year 2012 and later gasoline powered engines produced for sale in the United States to be equipped with a special low permeation fuel supply hose between the carburetor and fuel tank. When servicing model year 2012 and later equipment, only fuel supply hoses certiﬁed by EPA can be used to replace the original equipment supply hose. Fines up to $37,500 may be enforced for using an un-certiﬁed replacement part.

Carburetor Adjustment

Idle adjusting screw

High speed needle (H)

Low speed needle (L)

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 prevent settings outside acceptable limits.

1. Before adjusting carburetor clean or replace air ﬁlter and mufﬂer “Spark Arrestor Screen”.

2. Install the wheel.

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 “L” speed needle counterclockwise (CCW) to stop. Turn “H” 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 wheel begins to turn, then turn screw out CCW until the wheel stops turning. Turn screw out, CCW, an additional 1 + ½ turn.

High Altitude Operation

This engine has been factory adjusted to maintain satisfactory starting, emission, and durability performance up to 1100 feet above sea level (ASL) (96.0 kPa). To maintain proper engine operation and emission compliance above 1100 feet ASL the carburetor may need to be adjusted by an authorized ECHO service dealer.

IMPORTANT

If the engine is adjusted for operation above 1100 feet ASL, the carburetor must be readjusted when operating the engine below 1100 feet ASL, otherwise severe engine damage may result.

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.

7. Check idle speed and reset if necessary as described in item 5. If a tachometer is available idle speed should be set to 2800 rpm.

CAUTION

When starting, idling adjustment speed should be adjusted not to rotate the wheel. Correct idle speed is adjusted 2800 rpm. Or 1 + ½ turn CCW from the point the wheel stops moving. When you experience trouble with the carburetor, contact your dealer.

CSG-7410

Cylinder Fins

Cylinder ﬁns

Mufﬂer Spark Arrestor

Spark arrestor screen

Bolts

Spark arrestor screen cover

1. Check periodically.

2. Clogged ﬁns will result in poor engine cooling.

3. Remove dirt and dust from between ﬁns to let cooling air pass easily.

1. Remove air cleaner cover and remove spark plug lead.

2. Remove the cutter arm. (See page 30.)

3. Remove spark arrestor screen cover and screen from mufﬂer body.

4. Clean carbon deposits from mufﬂer components.

5. Replace screen if it is cracked, or has holes burned through.

6. Assemble components in reverse order.

NOTE

Carbon deposits in mufﬂer will cause drop in engine output. Spark arrestor screen must be checked periodically.

Clutch and Maximum Speed Checks

Clutch

Slipping of the clutch under a cutting load is not the only thing that can happen to a clutch. Another problem may appear during setting of the Carburetor for proper idling speed. The clutch may be at fault if an adjustment high enough for stable idling results in wheel rotation. Such a condition should be checked out by your servicing dealer before any further use of the saw.

Speed

To ensure the wheel does not over speed, the engine no load speed must be adjusted to a maximum of 9950 rpm. Use a tachometer to measure speed. If engine speed exceeds 9950 rpm, have the unit serviced by your nearest ECHO servicing dealer before further use.

Whenever activated, the vibration-sensitive governor in the Carburetor high speed fuel circuit supplies more fuel than the engine can burn. Consequently, the engine has to purge itself of the extra fuel and slows down in the process. Proper high speed adjustment (see page 28) of the Carburetor should result in engine high speed, no load, operation within the desired range. This range is 9750 rpm ± 200 rpm, which is required for the proper wheel spindle speed range of 3700 – 3820 rpm.

WARNING

CSG-7410

Belt Change and Adjustment

Adjusting the Belt

Washer

Tension screw

Water-ﬂush pipe

Tension screw

Mark

Bolt

Pipe connector

Pulley cover

Adjust the belt if it becomes loose.

1. Loosen the 2 pulley cover bolts about 1 turn.

2. Turn the tension screw so the washer lines up with the mark on the clutch cover.

3. Tighten the 2 pulley cover bolts. Note: Tighten to a torque of 23 to 27N･m (230 to 270 kgf･cm).

Replacing the Belt

Replace the belt when it becomes very worn

(peeling, turning, cuts, cracking, etc.)

1.Disconnect the water-ﬂush pipe from the pipe connector.

2. Loosen the tension screw and then remove the 2 pulley cover bolts.

Pulley (small)

Clutch cover

Belt

Cutter arm

Belt

Clutch cover

3. Remove the pulley cover along its rail.

4. Loosen the clutch cover bolt and then remove the clutch cover.

5. Remove the old belt and then remove the cutter arm.

6. Put the new belt on the small pulley.

7. While pulling the belt in the direction of the cutter, install the clutch cover and fasten it with its bolt.

CSG-7410

Flange

Bolt

Cutter arm

Belt

Large pulley

8. Fit the cutter arm into the long hole in the crankcase and then put the belt on the large pulley.

9. Put the pulley cover on along the outside of the cutter arm. Make sure the pulley cover is not misaligned when putting it into the arm.

10. Tighten the 2 pulley cover bolts and then back them off 1 turn. Adjust the tightness of the belt.

11. Tighten the 2 pulley cover bolts. Note: Tighten to a torque of 23 to 27N･m (230 to 270 kgf･cm).

12. Insert the water-ﬂush pipe into the pipe connector.

13. The belt stretches after being replaced, so readjust its tension after operating the machine.

1. Check for wear, cracks and broken pieces.

2. Replace with a new one if anything is abnormal.

Wheel Guard

Wheel guard locking knob

1. Make sure it does not touch the cutting wheel, as a result of deformation or rattling.

2. Consult your dealer if the wheel guard moves back and forth even when the wheel guard locking knob is tightened.

3. Consult your ECHO dealer if there is any wear or cracking.

Wheel guard

CSG-7410

Troubleshooting Cutting Problems

Trouble Probable Cause Remedy

Wheel stops when cutting pressure is applied

Poor cutting – wheel discolored at outer area

1. Bearing down too hard

2. Binding in crooked cut

3. Binding in closing cut

4. Loose belt

Belt worn beyond the limit Replace belt

Heat damage

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 wheel. Do not cut long in one spot. Water ﬂush when recommended.

Troubleshooting Engine Problems

Trouble Probable Cause Remedy

1. Out of fuel 1. Fill fuel tank

2. Engine ﬂooded 2. Remove spark plug

• Push in and hold the momentary STOP switch

• Crank the engine to expel the fuel

• Install clean, dry, properly gapped spark plug

Engine will not start

Engine hard to start

Engine misses

Engine overheats and / or stalls under cutting load

3. Fuel ﬁlter clogged 3. Install clean fuel ﬁlter. Check that fuel pick-up line is not leaking or clogged. Clean fuel tank.

4. Air ﬁlter blocked 4. Replace air ﬁlter element

5. Spark plug fouled or cracked 5. Replace plug.

6. 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 4. See “Carburetor Adjustment” or seek

1. Dirt in Carburetor or fuel line 1. Contact nearest authorized servicing dealer

2. Carburetor out of adjustment 2. Adjust, or seek dealer service

3. Weak or intermittent spark 3. Contact nearest authorized servicing dealer

1. Not enough oil 1. Use proper amount of oil in fuel mixture

2. Air passages around cylinder

clogged

3. Carburetor main adjustment

is set too “Lean”

6. 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 spark plug

• Push in and hold the momentary STOP

switch

• Crank the engine to expel the fuel

• if not choked enough, set controls properly

for starting

authorized dealer for adjustment

2. Clean air intake grid on starter side, ﬂywheel, cylinder ﬁns and surrounding area

3. See “Carburetor Adjustment” or seek authorized dealer for adjustment

CSG-7410

STORAGE AFTER USE

WARNING

• Inspect and adjust every part of the engine cutoff saw.

- Completely clean every part and repair if

necessary.

- Apply thin coating of oil on metal parts to

prevent rust.

• Remove wheel.

• Drain fuel tank, pull starter slowly a few times to drain fuel from carburetor.

• Pour a small amount of clean motor oil into spark plug hole, pull starter and crank the engine until piston reaches: TOP DEAD CENTER.

• Store in a dry area, free from dust.

WARNING

Do not store in an enclosure where fuel fumes may accumlate or reach an open ﬂame or spark.

CAUTION

Do not lend or rent your engine cut-off saw without the Operator's Manual.

NOTE

• For future reference, you should keep this Operator's Manual.

• If this Operator's Manual has become illegible or is lost, please purchase a new one from your ECHO dealer.

CSG-7410

TECHNICAL DATA

Model

External dimensions : Without cutting wheel

Length × Width × Height mm (in) 620 × 240 × 407 (24.4 x 9.4 x 16.0)

Mass : Without cutting wheel and empty tank kg (lb) 10.7 (23.6)

Volume :

Fuel tank mL

(US ﬂ. oz.)

Fuel ( Mixture ratio ) 50:1 ratio with ECHO band oil,

Engine :

Type Air-cooled, two-stroke, single cylinder

Engine displacement

Carburetor Diaphragm type, Inner vent type

Magneto Flywheel magneto, CDI type

Spark plug NGK BPMR7A

Starter Recoil starter

Clutch Centrifugal type

Maximum shaft brake power kW 3.2

Wide open throttle speed rpm 9650 (9350-9750)

Idle speed rpm 2800 (2600-3000)

Throttle control Throttle trigger with throttle lockout

Cutting device :

Belt 6PJ-808

Pulley ratio 2.57 : 1

Belt tensioner Coil Spring system

Wheel mm (in.) 350 × 4.7 × 20 (14 x 6/32 x 25/32)

Maximum cut-off wheel speed rpm 3820

Flange outside diameter mm 100

Wheel fastener tightening torque N•m 25 - 30

Maximum spindle speed rating rpm 3820

Sound pressure level : measured at 15 m (50 ft) dB(A) 78.2

Other device :

Vibration reduction system Rubber mounted between the engine

mL (cu.in.)

700 (23.67)

ISO-L-EGD (ISO/CD 13738), JASO M345-FC/FD two-stroke, air-cooled engine oil.

Use 89 octane unleaded. Do not use fuel containing methyl alcohol, more than 10% ethyl alcohol or 15% MTBE.

gasoline engine

73.5 (4.49)

and the handles

CSG-7410

* Technical data subject to change without notice.

CSG-7410

WARRANTY REGISTRATION SHEET

Thank you for choosing ECHO Power Equipment

Please go to http://www.echo-usa.com/Warranty/Register-Your-ECHO to register your new product on-line. It’s FAST and EASY! NOTE: your information will never be sold or misused by ECHO, Inc. Registering your purchase enables us to contact you in the unlikely event of a service update or product recall, and veriﬁes your ownership for warranty consideration.

If you do not have access to the Internet, you can complete the form below and mail to:

ECHO Inc., Product Registration, PO Box 1139, Lake Zurich IL 60047.

CSG-7410

NOTES

CSG-7410

C72715001001 – C72715999999

Echo CSG-7410 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual