STIHL TS 420, TS 410 Instruction Manual

STIHL TS 410, 420

WARNING

Read Instruction Manual thoroughly before use and follow all safety precautions – improper use can cause serious or fatal injury.

ADVERTENCIA

Antes de usar la máquina lea y siga todas las precauciones de seguridad dadas en el manual de instrucciones – el uso incorrecto puede causar lesiones graves o mortales.

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Instruction Manual Manual de instrucciones

Instruction Manual 1 - 50

Manual de instrucciones 51 - 106

Contents

English

Guide to Using this Manual 2 Safety Precautions and Working

Techniques 3 Sample applications 16 Cutting wheels 20 Composite resin cutting wheels 20 Diamond cutting wheels 21 Electronic water control 24

Original Instruction ManualPrinted on chlorine-free paper

Assembling the cast arm and guard 25 Tensioning the ribbed V-belt 29 Fitting / replacing an abrasive

wheel 29 Fuel 31 Fueling 32 Starting / Stopping the Engine 33 Air Filter System 35 Engine Management 36 Adjusting the Carburetor 37 Spark Arresting Screen in Muffler 38 Spark Plug 38 Rewind Starter 40 Replacing the V-belt 40

Printing inks contain vegetable oils, paper can be recycled.

Cut-off machine cart 41 Storing the Machine 41 Maintenance and Care 42 Main Parts 44 Specifications 46 Maintenance and Repairs 47

Disposal 47 STIHL Incorporated Federal

Emission Control Warranty Statement 48

Trademarks 50

Allow only persons who fully understand this manual to operate your cut-off machine.

To receive maximum performance and satisfaction from your STIHL Cutquik cut-off machine, it is important that you read, understand and follow the safety precautions and the operating and maintenance instructions in the chapter "Safety Precautions and Working Techniques" before using your cut-off machine. For further information you can go to www.stihlusa.com

Contact your STIHL dealer or the STIHL distributor for your area if you do not understand any of the instructions in this manual.

WARNING

Because a cut-off machine is a highspeed cutting tool, some special safety precautions must be observed to reduce the risk of personal injury. Careless or improper use may cause serious or even fatal injury.

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TS 410, TS 420

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Guide to Using this Manual

Pictograms

The meanings of the pictograms attached to or embossed on the machine are explained in this manual.

Depending on the model concerned, the following pictograms may be on your machine.

Fuel tank for gasoline and engine oil mixture

Press to operate decom pression valve

Press to operate manual fuel pump

Water attachment, flow control

Tensioning nut for engag ing drive belt

Symbols in Text

Many operating and safety instructions are supported by illustrations.

The individual steps or procedures described in the manual may be marked in different ways:

N A bullet marks a step or procedure. A description of a step or procedure that

refers directly to an illustration may contain item numbers that appear in the illustration. Example:

N Loosen the screw (1). N Lever (2) ...

In addition to the operating instructions, this manual may contain paragraphs that require your special attention. Such paragraphs are marked with the symbols and signal words described below:

DANGER

Indicates an imminent risk of severe or fatal injury.

WARNING

Indicates a hazardous situation which, if

not avoided, could result in severe or fatal injury.

Engineering Improvements

STIHL’s philosophy is to continually improve all of its products. As a result, engineering changes and improvements are made from time to time. Therefore, some changes, modifications and improvements may not be covered in this manual. If the operating characteristics or the appearance of your machine differs from those described in this manual, please contact your STIHL dealer or the STIHL distributor for your area for assistance.

Pull starter grip

Indicates a risk of property damage, including damage to the machine or its individual components.

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NOTICE

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Safety Precautions and Working Techniques

The use of any cut-off machine may be hazard ous. Because a cut-off machine is a high-speed, fast-cutting power tool, special safety precau tions must be observed to reduce the risk of per sonal injury and fire.

It is important that you read, fully understand and observe the following safety precautions and warnings. Read the instruction manual and the safety precautions periodically.

WARNING

Careless or improper use of any cut-off machine may cause serious or fatal injury.

Have your STIHL dealer show you how to operate your cut-off machine. Observe all applicable national, state and local safety regulations, standards and ordinances.

WARNING

Your cut-off machine is for professional use only. Do not lend or rent your cut-off machine without the instruction manual. Be sure that anyone using it understands the information contained in this manual.

A first-time operator should obtain practical instruction before using the machine. Employers should establish a training program for operators of gasoline-powered, hand-held portable

cut-off machines to assure safe operation of these machines and proper choice of cutting attachments. These safety precautions and warnings apply to the use of all current STIHL Cutquiks.

WARNING

Use your cut-off machine only for authorized uses. For instance, it is not suitable for cutting wood or wooden objects. Misuse may result in personal injury or property damage, including damage to the machine.

WARNING

Minors should never be allowed to use a cut-off machine. Bystanders, especially children, and animals should not be allowed in the area where a cut-off machine is in use. Never let the cut-off machine run unattended.

Different models may have different parts and controls. See the appropriate section of your instruction manual for a description of the controls and function of the parts of your model cut-off machine.

Safe use of a cut-off machine involves

1. the operator

2. the power tool

3. the use of the power tool.

THE OPERATOR

Physical Condition You must be in good physical condition

and mental health and not under the influence of any substance (drugs, alcohol, etc.) which might impair vision, dexterity or judgment. Do not operate a cut-off machine when you are fatigued. Be alert – if you get tired while operating your cut-off machine, take a break; tiredness may result in loss of control. Working with any cut-off machine can be strenuous. If you have any condition that might be aggravated by strenuous work, check with your doctor before operating a cut-off machine.

WARNING

Prolonged use of cut-off machines (or other machines) exposing the operator to vibrations may produce whitefinger disease (Raynaud's phenomenon) or carpal tunnel syndrome. These conditions reduce the hand's ability to feel and regulate temperature, produce numbness and burning sensations and cause nerve and circulation damage and tissue necrosis. All factors which contribute to whitefinger disease are not known, but cold weather, smoking and diseases or physical conditions that affect blood vessels and blood transport, as well as high vibration levels and long periods of exposure to vibration are mentioned as factors in the development of whitefinger disease. In order to reduce the risk of whitefinger disease and carpal tunnel syndrome, please note the following:

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– STIHL cut-off machines are

equipped with an anti-vibration ("AV") system designed to reduce the transmission of vibrations created by the machine to the operator's hands. An AV system is recommended for those persons using cut-off machines on a regular or sustained basis.

– Wear gloves and keep your hands

warm.

– Keep the AV system well

maintained. A cut-off machine with loose components or with damaged or worn AV elements will tend to have higher vibration levels.

– Maintain a firm grip at all times, but

do not squeeze the handles with constant, excessive pressure. Take frequent breaks.

All the above-mentioned precautions do not guarantee that you will not sustain whitefinger disease or carpal tunnel syndrome. Therefore, continual and regular users should monitor closely the condition of their hands and fingers. If any of the above symptoms appear, seek medical advice immediately.

WARNING

The ignition system of your unit produces an electromagnetic field of a very low intensity. This field may interfere with some pacemakers. To reduce the risk of serious or fatal injury, persons with a pacemaker should consult their physician and the pacemaker manufacturer before operating this tool.

Proper Clothing

WARNING

To reduce the risk of injury, the operator should wear proper protective apparel.

Clothing must be sturdy and snug-fitting, but allow complete freedom of movement. Avoid loosefitting jackets, scarfs, neckties, jewelry, flared or cuffed pants, uncon fined long hair or anything that could become caught on any obstacles or moving parts of the unit. Wear overalls or long pants to protect your legs. Do not wear shorts.

WARNING

When cutting metal, a cut-off machine generates sparks that can ignite clothing. Most fabrics used in clothing are flammable – even flame-retardant fabrics will ignite at higher temperatures. To reduce the risk of burn injury STIHL recommends wearing clothing made of leather, wool, flame-retardant-treated cotton or a tightly woven, heavier cotton such as denim. Some flame-retardant synthetic fabrics are also suitable, but others such as polyester, nylon, rayon and acetate can melt during a fire into a tar-like matter that burns into the skin. Check the clothing manufacturer's instructions. Keep clothing free of oil, fuel, grease and other flammable substances.

Always wear heavy duty work gloves (e.g. made of leather or other wear resistant material) when handling the cutt-off machine. Heavy-duty, nonslip gloves improve your grip and help to pro tect your hands.

Good footing is important in cut-off machine work. Wear sturdy boots with nonslip soles. Steel-toed safety boots are recommended.

WARNING

Loose objects may be thrown toward the operator by the cutting tool.

To reduce the risk of injury to your eyes never operate a cut-off machine unless wearing goggles or properly fitted safety glasses with adequate top and side protection complying with ANSI Z87 "+". Proper eye protection is a must.

Wear an approved safety hard hat to protect your head. Cut-off machine noise may damage your hearing. Always wear sound barriers (ear plugs or ear mufflers) to help protect your hearing. Regular users should have their hearing checked regularly.

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WARNING

When wet cutting at the recommended flow rate is not utilized, the opera tor should always wear a respirator approved by NIOSH/MSHA for the material being cut to reduce the risk of serious or fatal respiratory illness. For additional details and warnings on this subject, see information under "Working Conditions" in this instruction manual.

THE POWER TOOL

For illustrations and definitions of the parts of the cut-off machine, see the chapter "Main Parts."

WARNING

Never modify a cut-off machine in any way. Only STIHL branded parts and cutting attachments expressly approved by STIHL for use with the specific STIHL cut-off machine models are recommended. Although certain other parts or attachments may be useable with the STIHL powerhead, their use may, in fact, be extremely dangerous.

Abrasive Wheels

WARNING

Before mounting the cutting wheel, make sure that the maximum operating wheel speed is above or equal to the spindle speed of your cut-off machine as

provided in the specifications of this manual. A wheel that is not so rated may shatter or break and poses a threat of serious or fatal injury to the operator and other nearby persons.

Abrasive wheels for free-hand cutting are subjected to particularly high bending and compression stresses.

WARNING

Never use a reducer bushing inserted into the wheel to reduce the diameter of the arbor hole. It may slip out of place, causing out-of-roundness, vibration and wheel breakage.

WARNING

Wheels that are not STIHL branded may be more likely to shatter or break or create other hazards, such as increased reactive forces. Use only wheels with approved RPM ratings. Read and follow any addional safety precautions that accompany the wheel.

WARNING

Inspect the abrasive wheel frequently and replace immediately if the abrasive wheel is cracked or warped. Cracked or warped wheels may shatter or break and cause serious or fatal personal injury. Out-of-round or unbal anced abrasive wheels increase vibration and reduce the service life of the cut-off machine.

Some diamond abrasive wheels that are not STIHL branded utilize poor quality steel cores, are not properly tensioned, or have other design or manufacturing defects. As a result, they may begin to wobble during use, which can cause wheel breakage. Such wobbling can also lead to a severe binding of the wheel in the kerf, that, under certain circumstances, can then result in serious or fatal injury from reactive forces. See the section entitled "Reactive Forces including Kickback." Never use a wheel that wobbles or that has ever wobbled. Even though such a wheel may temporarily cease to wobble, e.g., if run without load, it will always be prone to wobble again under certain conditions. Replace it immediately before further use.

Composite abrasive wheels are heat sensitive. Always store your cut-off machine in a place where a composite wheel is not exposed to direct sunlight or other sources of heat. Store spare composite wheels flat on a level surface in a dry place where there is no risk of frost damage. Failure to follow these directions may cause the wheel to shatter or crack in use causing serious or fatal injury.

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WARNING

Never use circular saw blades, carbide tipped blades, rescue blades, wood-cutting blades or toothed blades of any nature. They can cause severe personal injury from blade contact, thrown objects and/or reactive forces, including kickback. See section on "Reactive Forces." Your STIHL dealer stocks a range of special abrasive wheels for the many applications of the cut-off machine.

WARNING

Use of the wrong abrasive wheel or the cutting of material for which the wheel was not designed may cause the wheel to wobble, shatter or increase reactive forces, causing serious or fatal injury. See below and section "Reactive Forces."

Only use the abrasive wheel approved for the type of material to be cut. There are different types of abrasive wheels, each specially marked. With respect to STIHL composite wheels, for example:

1. Stone Also can be used for concrete, masonry, reinforced concrete and brick cutting.

2. Steel Can be used for all ferrous metal cutting.

3. Asphalt Also can be used for aggregate concrete cutting.

4. Ductile iron Also can be used for certain grades of cast iron (SG 17-24), bronze and copper cutting.

For cutting composite materials please ask your STIHL dealer.

Diamond Abrasive Wheels Diamond abrasive wheels have a much

better cutting performance than composite abrasive wheels. The diamond wheels are steel centered, and diamond particles are imbedded in their cutting edges.

They can be used for concrete, asphalt, natural stone, clay pipe, brick and the like. STIHL also offers diamond wheels for cutting ductile iron and some structural steel.

They are not, however, suitable for cutting all metals and other materials.

Wet or dry cutting is possible. Water attachments are included with your STIHL cut-off machine. See the appropriate section of your instruction manual.

WARNING

Do not remount a used diamond abrasive wheel without first inspecting for under-cutting, flatness, core fatigue, segment damage or loss, signs of overheating (discoloration) and possible arbor hole damage. See the chapter "Diamond Cutting Wheels." Check the wheel for cracks and make sure that no pieces have broken off the wheel before use.

Always fit the wheel so that the arrow on the wheel points in the direction of the rotation of the spindle.

THE USE OF THE POWER TOOL

Transporting the STIHL Cutquik

WARNING

To reduce the risk of injury from unintended activation and/or contact with a moving wheel, always stop the engine before putting a cut-off machine down or carrying it. The abrasive wheel continues to rotate (coast down) for a short while after the throttle trigger is released (flywheel effect). Bring the wheel to a stop by lightly contacting the bottom of the wheel with a hard surface or wait until the wheel comes to a complete stop on its own. Carrying a cutoff machine with the engine running is extremely dangerous. Accidental acceleration of the engine can cause the wheel to rotate. Avoid touching the hot muffler.

By hand: When carrying your cut-off machine by hand, the engine must be stopped and the cut-off machine must be in the proper position. Grip the front handle and place the muffler at the side away from the body with the cutting attachment to the rear.

WARNING

Always protect the cutting wheel from hitting the ground or any other objects. Damaged wheels may shatter and cause serious or fatal injury.

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By vehicle: Properly secure your cut-off machine to prevent turnover, fuel spillage and damage to the cut-off machine. Never transport with cutting wheel mounted. A wheel damaged during transportation may shatter during operation and cause serious personal injury.

Fuel Your STIHL power tool uses an oil-

gasoline mixture for fuel (see the chapter on "Fuel" of your instruction manual.)

WARNING

Gasoline is an extremely flammable fuel. If spilled and ignited by a spark or other ignition source, it can cause fire and seri ous burn injury or property damage. Use extreme caution when handling gasoline or fuel mix. Do not smoke or bring any fire or flame near the fuel or the power tool. Note that combusti ble fuel vapor may escape from the fuel system.

WARNING

Dust may collect on the powerhead, especially around the carburetor, and may absorb gasoline resulting in a risk of fire. Clean dust from the powerhead regularly.

Fueling Instructions

WARNING

Fuel your power tool in well-ventilated areas, outdoors. Always shut off the engine and allow it to cool before refueling. Gasoline vapor pressure may build up inside the fuel tank depending on the fuel used, the weather conditions and the tank venting system.

In order to reduce the risk of burns and other personal injury from escaping gas vapor and fumes, remove the fuel filler cap on your power tool carefully so as to allow any pressure build-up in the tank to release slowly. Never remove the fuel filler cap while the engine is running.

Select bare ground for fueling and move at least 10 feet (3 m) from the fueling spot before starting the engine. Wipe off any spilled fuel before starting your machine.

WARNING

Check for fuel leakage while refueling and during operation. If fuel leakage is found, do not start or run the engine until the leak is fixed and any spilled fuel has been wiped away. Take care not to get fuel on your clothing. If this happens, change your clothing immediately.

WARNING

If fuel gets spilled on clothes, especially trousers, it is very important to change clothes immediately. Do not rely upon evaporation. Flammable quantities of fuel may remain on clothes after a spill for longer than expected. Cutting metal with a cut-off machine when clothes are wet or damp from gasoline is extremely dangerous, as the operator's clothes might catch fire and cause serious or fatal injury.

WARNING

An improperly tightened fuel cap can loosen or come off and spill quantities of fuel.

Different cut-off machines may be equipped with different fuel filler caps:

Bayonet Fuel Filler Cap

Never use a tool to open or close the bayonet fuel filler cap, as this could damage the cap and cause fuel to leak out.

The bayonet fuel filler cap must be securely closed after refuelling.

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Fuel Filler Cap with Screw Thread

Tighten the fuel filler cap as securely as possible after refuelling.

This reduces the risk of the cap working loose due to engine vibrations and fuel leaking out.

WARNING

Never attempt to force the cap open by using a tool. It may damage the cap and allow fuel to leak.

WARNING

Before use, make sure that the fuel cap has been completely and properly tightened and any spilled fuel wiped away. Check for fuel leakage while refueling and during operation. If a fuel leak is suspected, do not start or run the engine until the leak is fixed and spilled fuel has been wiped away.

Before Starting For wheel installation, follow the

procedure described in the appropriate sections of your instruction manual.

WARNING

Check fuel system for leaks, especially the visible parts, e.g., filler cap, hose connections, manual fuel pump (only for power tools equipped with a manual fuel pump). Do not start the engine if there are leaks or damage – risk of fire! Have the machine repaired by a servicing dealer before using it.

WARNING

Never operate a cut-off machine if it is damaged, improperly adjusted or maintained, or not completely or securely assembled. Check machine that it is ready for proper operation.

Keep the handles dry, clean and free of oil and fuel.

WARNING

Before operation of your cut-off machine, be sure the controls (e.g. throttle trigger, throttle trigger lockout, stop switch) and the safety devices are working properly, the carburetor idle and maximum speed are correctly adjusted, the wheel is properly mounted, and the wheel guard is in place and securely fastened to your unit. All wheels should be carefully inspected for good condition before mounting.

Adjust the wheel guard so that sparks, dust and cut material are deflected away from the operator, and cannot reach flam

mable surroundings. See section "Operating Instructions" of your instruction manual.

WARNING

Check that the spark plug boot is securely mounted on the spark plug – a loose boot may cause arcing that could ignite combustible fumes and cause a fire.

Proper tensioning of the ribbed V-belt is important. In order to avoid an incorrect setting, the tensioning procedure must

be followed as described in your manual. Always make sure the hexagonal collar nuts for the cast arm are tightened securely.

Check ribbed belt tension after one hour of operation and correct if necessary.

Starting

WARNING

Your cut-off machine is a one-person tool. Do not allow other persons to be near a running cut-off machine. Start and operate your cut-off machine without assistance. For specific starting instructions, see the appropriate section of your instruction manual.

Do not drop start. This method is very dangerous because you may lose control of the cut-off machine. Place the cut-off machine on firm ground or other solid surface in an open area. Maintain good balance and secure footing. Be

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absolutely sure that the cutting wheel is clear of you and all other obstructions and objects, including the ground. When the engine starts at starting-throttle, engine speed will be fast enough for the clutch to engage the belt pulley and turn the wheel. Never attempt to start the cutoff machine when the abrasive wheel is in a cut.

Once the engine has started, immediately blip the throttle trigger, which should release the starting throttle lock and allow the engine to slow down to idle.

WARNING

When you pull the starter grip, do not wrap the starter rope around your hand. Do not allow the grip to snap back, but guide the starter rope slowly back to permit the rope to rewind properly. Failure to follow this procedure may result in injuries to hand or fingers and may damage the starter mechanism.

Important Adjustments At correct idle speed, the wheel should

not turn. For directions to adjust idle speed, see the appropriate section of your instruction manual.

WARNING

Do not use a cut-off machine with incorrect idle speed adjustment. The rotating wheel may cause injury. If you cannot obtain the correct setting, have your STIHL dealer check your cut-off machine and make proper adjustments or repairs.

Working Conditions Operate the cut-off machine under good

visibility and daylight conditions only. Wearing of hearing protection reduces

sound perception. Be alert not to miss voice signals from co-workers. Keep within calling distance to other persons who may assist in case of emergency.

WARNING

As soon as the engine is running, this product gen erates toxic exhaust fumes containing chemi cals, such as unburned hydrocarbons (including benzene) and carbon monoxide, that are known to cause respira tory problems, cancer, birth defects, or other reproductive harm. Some of the gases (e.g. carbon monoxide) may be color less and odorless. To reduce the risk of serious or fatal injury/illness from inhaling toxic fumes, never run the machine indoors or in poorly venti lated locations. Ensure proper ventilation when working in trenches or other confined areas.

WARNING

Use of this product to cut masonry, concrete, metal and other materials can generate dust and fumes containing chemicals known to cause serious or fatal injury or illness, such as respiratory

disease, cancer, birth defects or other reproductive harm. If you are unfamiliar with the risks associated with the particular material being cut, review the material safety data sheet and/or consult your employer, the material manufacturer/supplier, governmental agencies such as OSHA and NIOSH and other sources on hazardous materials. California and some other authorities, for instance, have published lists of substances known to cause cancer, reproductive toxicity, etc.

Control dust and fumes at the source where possible.

In this regard use good work practices and follow the recommendations of the manufacturer/supplier, OSHA/NIOSH, and occupational and trade associations. A water attachment kit is provided with your cut-off machine and should be used to reduce dust whenever wet cutting is feasible. For dust suppression purposes, the flow rate should be at least 0.6 liters (20 fl.oz) of

water per minute. If wet cutting at the recommended flow rate is not utilized, the operator and any bystanders should always wear a respirator approved by NIOSH/MSHA for the material being cut. See the section on "Respiratory

Protection" in the chapter "Sample Applications" in the instruction manual. Even if wet cutting at the recommended flow rate, an operator who is actively cutting for more than two hours in one day should wear at least a NIOSHapproved disposable respirator. Consult and follow any federal, state or local laws or regulations with respect to dry and wet cutting.

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WARNING

Cutting masonry, concrete and other materials with silica in their composition may give off dust containing crystalline silica. Silica is a basic component of sand, quartz, brick clay, granite and numerous other minerals and rocks. Repeated and/or substantial inhalation of airborne crystalline silica can cause serious or fatal respiratory diseases, including silicosis. In addition, California and some other authorities have listed respirable crystalline silica as a substance known to cause cancer. When cutting such materials, always follow the respiratory precautions mentioned above.

WARNING

Breathing asbestos dust is dangerous and can cause severe or fatal injury, respiratory illness or cancer. The use and disposal of asbestos-containing products have been strictly regulated by OSHA and the Environmental Protection Agency. Do not use your cut-off machine to cut or disturb asbestos, asbestoscontaining products, or products such as pipes which are wrapped or covered with asbestos insulation. If you have any reason to believe that you might be cutting asbestos, immediately contact your employer or a local OSHA representative.

WARNING

Your STIHL cut-off machine is designed for hand-held use or operation on a cutoff machine cart. Cutting with your cutoff machine resting on the ground or other surface can cause excessive wear to the bracket designed to protect the bottom of the tank housing. Loss of fuel and personal injury from fire may result. Replace damaged or badly worn brackets immediately.

Grip: Never use the cut-off machine with one hand. Always hold the cut-off machine firmly with both hands when the engine is running. Place your left hand on front handle bar and your right hand on rear handle and throttle trigger. Lefthanded users should follow this instruction too.

Wrap your fingers tightly around the handles, keeping the handles cradled between your thumbs and forefingers. Make sure your cut-off machine handles and grip are in good condition and free of moisture, pitch, oil, fuel mix or grease.

Never touch a rotating wheel with your hand or any part of your body.

WARNING

Clear the area where you are working. Avoid stumbling on obstacles and watch out for holes or ditches. Be extremely cautious when working on slopes or uneven ground. Take extreme care in wet and freezing weather (rain, snow,

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ice.)

WARNING

Never operate the cut-off machine with the starting-throttle lock engaged as this does not permit proper control of the speed of the unit and may lead to serious injury.

WARNING

Sparks from cutting metal can burn or cause cloth ing to catch fire. Always direct sparks away from the operator or any flam mable surroundings. Never cut metal while standing on a flammable surface, such as wood or tar paper. Where there is a risk of fire, have appro priate fire extinguishing equipment readily available.

WARNING

To reduce the risk of injury from fire, do not cut into any pipe, drum or other container without first ensuring that it does not contain a volatile or flammable substance.

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WARNING

When cutting into existing walls, floors or similar structures, be alert for hidden hazards such as electrical cables, water and gas pipes and flammable substances. Make sure that power, water and gas have been shut off and pipes drained before starting to cut.

Operating Instructions

WARNING

The wheel guard is adjustable. It is extremely important that the wheel guard is in place and set to suit the type of work and your stance. The guard should always be adjusted so that the user is not endangered by particles of the material being cut, sparks or pieces of damaged wheels either directly or by ricochet. Failure to follow this instruction could result in serious or fatal injury.

WARNING

Your cut-off machine is equipped with a wheel guard limit stop that restricts the positioning of the wheel guard. To reduce the risk of injury from wheel contact and/or reactive forces and to avoid damaging the guarding system, never attempt to pull the adjusting lever past the limit stop.

WARNING

Always check the wheel before use and after unintentionally striking any object; frequently check it during use when it is stopped. Look for cracks and make sure that it is undamaged and in good condition and that no pieces have broken off. See sections on "Abrasive Wheels" and "Reactive Forces" in this manual. Check the wheel guard for cracks. If you discover any breaks or cracks, fit a new guard before further use.

WARNING

It is essential to determine the exact direction of the cut before applying the abrasive wheel to the work. Wheels are

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constructed for radial pressure only. Lateral pressure must be avoided. Hold the cut-off machine steady. To reduce the risk of serious or fatal injury, do not change the direction of the cut during the cut as this may produce a high torsional load on the abrasive wheel and may cause it to bind, break or shatter. A binding of the wheel can also result in reactive forces. See section on "Reactive Forces."

WARNING

Do not use abrasive wheels for rough grinding. Large bending stresses occur during such work, which may cause abrasive wheels to shatter or break and result in serious or fatal injury.

WARNING

To reduce the risk of injury from shattered abrasive wheels:

1. Do not exceed the maximum operating speed marked on the wheel.

2. Do not use a wheel that has been dropped.

3. Test each new wheel immediately after installation for approximately one minute at maximum speed without cutting, making sure to keep bystanders away.

4. Do not cut any material for which the abrasive wheel is not authorized.

5. Do not grind on the side of the abrasive wheel.

6. Do not twist, thrust, knock or drop the machine. This can cause damage to the wheel.

To achieve a clean and efficient cut, pull the abrasive wheel across the work or move it "to and fro" in the cutting direction. Do not use force to push the abrasive wheel into the work.

Insert the wheel into the material only as deep as necessary to make the cut. To reduce the amount of dust created, do not cut all the way through stone and concrete materials – leave a thin piece uncut. For most such materials, this piece can be easily broken afterwards. Do not cock, jam or wedge the wheel in the cut.

Always stop the engine and be sure the wheel has stopped rotating before setting down the cut-off machine.

If a cut-off machine cart is used, sweep debris from the path of the wheels, as debris under one of the cart’s wheels may cause flexing of the abrasive wheel. This could result in high frictional forces and thus greatly reduce the engine

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power available for the actual cutting work. It could also damage the abrasive wheel.

STIHL recommends the use of the cart for longer cuts in a straight line.

Wet Cutting with Abrasive Wheels Before wet cutting, make sure water will

not damage the floor or building.

WARNING

To reduce the risk of electrocution to you or bystanders, do not allow water or sludge to contact live electric wires.

WARNING

To reduce the risk of injury from wheel breakage when wet cutting with any composite wheel:

1. Make certain water does not flow on a wheel that is not running, since the wheel will absorb water, which will affect wheel balance.

2. Be certain water is applied to both sides of wheel, since uneven distribution can cause "one sided" wear.

3. After finishing work, run the cutting wheel at normal operating speed for about 3 to 6 seconds without water so that the remaining water is flung off.

WARNING

To reduce the risk of injury from wheel breakage when wet cutting with a composite wheel that is not specifically designed for wet cutting, never store and

reuse such a wheel that has been used with water. Use these wheels up the same day.

Reactive Forces including Kickback

WARNING

Reactive forces may occur at any time the cut ting wheel on a cut-off machine is rotating.

The powerful force used to cut through a workpiece can be reversed and work against the operator. If the wheel is slowed or stopped by frictional contact with any solid object or by a pinch or binding, reactive forces can occur instantly and may result in the operator losing control of the cut-off machine, which, in turn, may result in serious or fatal injury.

An understanding of the causes of these reactive forces may help you avoid loss of control. Reactive forces are exerted in a direction opposite to the direction in which the wheel is moving at the point of contact or of pinching/binding. If the wheel is slowed solely by frictional contact with a solid object, such as the workpiece, the resulting reactive forces are normally moderate and readily controllable by an operator who is holding the machine properly. If, however, the wheel is abruptly slowed or stopped by a pinch or severe bind, the reactive forces may be substantially greater. The greater the force generated, the more difficult it will be for the operator to control the cut-off machine. Loss of control can result in severe personal injury or death.

Pull-away, Climbing, Pinching and Rotational Kickback Forces

The most common reactive forces are pull-away and climbing. If the contact is at the bottom of the wheel, a cut-off machine will try to pull away from the operator (pull-away.) If the contact is at the front of the wheel, the wheel may attempt to climb the object being cut (climbing.)

Pinching occurs when the piece being cut closes on the wheel. A severe binding may also occur if the wheel is substantially sideloaded in the kerf or if an improper or damaged diamond wheel begins or ceases to wobble in the kerf. If the wheel is severely pinched or bound in the upper quadrant, the wheel may be instantly thrown up and back towards the operator with great force in a rotational kickback motion. Such kickback situations can and should always be avoided. Pinching of the wheel can be prevented by proper support of the workpiece. (See below.) Severe binding of the wheel can be prevented by proper cutting techniques, e.g., not sideloading the wheel, and by the use of properly designed, manufactured and maintained wheels.

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002BA146 KN

002BA603 KN

Reducing the Risk of Kickback Injury

WARNING

To reduce the risk of kickback injury, avoid cutting with the upper quadrant of the wheel where possible. Be especially cautious for a pinching or binding of the wheel in this area, which can cause severe reactive forces in a rotational kickback motion.

Avoid wedge action. The severed part must not bind the abrasive wheel.

Be alert to potential movement of the workpiece or anything else that could cause the cut to close and pinch the wheel. In order to reduce the risk of pinching, support the workpiece in such a way that the cut remains open during the cutting process and when the cut is finished (see illustration). Never make a cut that results in a binding of the wheel. If you cannot properly support the workpiece, do not use a cutting-off machine to make the cut; select another tool or cutting technique that is not subject to kickback.

Where there is a possibility of a pinch, you can leave an uncut part that prevents the kerf from closing and pinching the wheel, which can later be broken manually. If you are making a

002BA582 ST

complete cut, make sure that the final, separating cut is made at the top of the workpiece with the bottom of the wheel. In this way, if there is any residual pinching, it will be at the bottom of the wheel, where it may result in pull-away, but not in kickback. Be alert for pullaway.

Objects to be cut must therefore be properly supported and must be secured against rolling away, slipping or vibrations.

Support an exposed pipe in a trench so that it is stable and capable of bearing weight. If the ends of the pipe are firmly in the ground, the ground may act as a support where the pipe emerges into the open. Additional support will be needed closer to the cut, however, to prevent sagging (see illustration). Be alert for pipe that is under stress that may cause it to shift when cut; pipe in the ground may be under stress because of uneven surfaces.

Make sure any section of pipe to be removed is also properly supported and will not shift. After the first cut, you may need to move the supports or add additional support for the second cut so that both sides of that cut are fully supported, including the section to be removed. That section can also be supported by means of a strap from above, e.g., suspended from a backhoe. It must be evenly supported and properly tensioned, however, so that the section remains in its position and does not tend to go up or down as a whole or on one side when separated.

Always pay attention in subgrade/subsurface work areas – supporting material can crumble or slide away.

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WARNING

Be particularly alert when cutting a workpiece such as a pipe with a belled end or cutting out a section of pipe in a trench that, if not properly supported, can sag or drop upon completion of the cut, creating a pinch not where you are actually cutting but, rather, at or near the top of the workpiece. If the pinch is in the upper quadrant of the abrasive wheel, kickback can result.

WARNING

Use wet-cutting whenever feasible, since the water can act as a lubricant in a pinch situation and thus reduce the likelihood of reactive forces occurring and the energy of any such forces that do occur, making it easier to maintain control of the machine.

WARNING

Only STIHL branded cutting attachments are recommended. Use of certain non-STIHL branded wheels may be extremely dangerous. Many substandard diamond wheels, for instance, are available in the market. If they are not manufactured with the proper quality steel in their core, if they are not properly tensioned, or if other design or manufacturing defects exist, they may, e.g., begin to wobble during use, lose segments or exhibit other operational problems that can substantially increase the risk of personal injury or death. If a diamond wheel begins or ceases to wobble within the kerf, the change in the behavior of the wheel may cause a severe binding that can lead to loss of control and/or

kickback. If the wheel you are using begins to wobble or has ever wobbled, discard it immediately. Although such a wheel may temporarily cease to wobble, e.g., if run without load, it will always be prone to wobble again under certain conditions.

WARNING

Some other non-STIHL branded diamond wheels are manufactured with abrasive material on their sides. Do not use such wheels, since the abrasive material may lead to substantially increased reactive forces in a pinch or sideloading situation.

WARNING

Never use chipped abrasive wheels or circular saw blades, carbide-tipped blades, rescue blades or wood-cutting or toothed blades of any nature on a cut-off machine. The use of such wheels or blades will greatly increase the risk of loss of control and severe personal injury or death from reactive forces, since the chipped section of an abrasive wheel or the teeth of a saw blade may catch in the material being cut and generate substantially greater reactive forces, including rotational kickback.

Cut-off machines are designed for use with abrasive wheels in good condition only. Machines designed for use with wood-cutting or other toothed blades use different types of guarding systems that provide the protection necessary for those types of blades. Machines, such as a cut-off machine, that are designed for use with abrasive wheels require a different guarding system, which is not designed to provide protection against

all dangers presented by circular saw blades, carbide-tipped blades, rescue blades or wood-cutting or toothed blades of any nature.

WARNING

To reduce the risk of injury from loss of control from reactive forces, including kickback:

1. Hold the cut-off machine firmly with both hands.

2. Maintain good balance and footing at all times. Never cut while standing on a ladder.

002BA554 AM

3. Position the cut-off machine in such a way that your body is clear of the cutting attachment. Avoid standing in direct line with the wheel (See illustration.) Never bend over the cutting attachment, especially when the guard is pulled back towards the top and there is a risk of reactive forces. Ensure sufficient freedom of movement, especially in trenches. Make sure there is sufficient space for the user and the fall of the severed part.

4. Do not cut above shoulder height.

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5. Only STIHL branded diamond and composite abrasive wheels are recommended. The use of nonSTIHL branded wheels can be extremely dangerous. Never work with a diamond wheel that wobbles or that has ever wobbled or that is manufactured with abrasive material on its sides.

6. Do not cut wood or any other material for which the abrasive wheel is not authorized.

7. Never use circular saw blades, carbide-tipped blades, rescue blades, wood-cutting blades or toothed blades of any nature. Their use increases the risk of injury from blade contact, thrown tips and reactive forces, including kickback.

8. Begin cutting and continue at full throttle.

9. Do not overreach.

10. Never sideload a wheel in the kerf.

11. Use your cut-off machine for cutting only. It is not designed for prying or shoveling away any objects.

12. Be especially alert for reactive forces, including kickback, when cutting with the front and upper quadrant of the wheel. Never pull the top of the wheel guard back beyond the limit stop.

13. Be alert to shifting of the workpiece or anything that could cause the cut to close and pinch the wheel, especially in the upper quadrant. Support the workpiece in such a way that the cut remains open. Never make a cut that results in a binding of the wheel.

14. Use wet-cutting whenever feasible. In a pinch situation the water can act as a lubricant and reduce the energy of reactive forces.

15. Release the pressure on the cut-off machine as you reach the end of the cut. Too much pressure may cause the operator to lose control of the cut-off machine when the abrasive wheel completes the cut. The abrasive wheel may contact the operator or strike some foreign object and shatter.

16. Use extreme caution when reentering a cut and do not turn the wheel at an angle or push the wheel into the cut as this may result in a binding of the wheel.

Gyroscopic Forces Be alert for gyroscopic forces that are

caused by the rapid spinning of the cutoff wheel. These forces result in opposition to directional change, e.g., when the operator attempts to move the machine in a sideways direction.

Maintenance, Repair and Storing of the Cut-Off Machine

Maintenance, replacement, or repair of the emission control devices and systems may be performed by any nonroad engine repair establishment or individual. However, if you make a warranty claim for a component that has not been serviced or maintained properly or if nonapproved replacement parts were used, STIHL may deny warranty coverage.

Never operate a cut-off machine that is damaged, improperly adjusted or not completely or securely assembled. Follow the maintenance and repair instructions in the appropriate sections of your instruction manual.

WARNING

Use only STIHL replacement parts for maintenance and repair. Use of parts manufactured by others may cause serious or fatal injury.

WARNING

Always stop the machine and make sure that the wheel is stopped before doing any maintenance or repair work or cleaning the cut-off machine. Do not attempt any maintenance or repair work not described in your instruction manual. Have such work performed only at your STIHL servicing dealer.

Clean off grinding dust after finishing work. Tighten all nuts, bolts and screws except the carburetor adjustment screws after each use.

Do not clean your machine with a pressure washer. The solid jet of water may damage parts of the machine.

WARNING

Never test the ignition system with spark plug boot removed from spark plug or with an unseated spark plug, since uncontained sparking may cause a fire.

WARNING

To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL. Always press spark plug boot

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English

snugly onto spark plug terminal of the proper size. (Note: If terminal has a detachable SAE adapter nut, it must be attached.) A loose connection between spark plug terminal and ignition wire connector in the boot may create arcing that could ignite combustible fumes and cause a fire. Keep spark plug clean, and make sure ignition lead is in good condition.

WARNING

Do not operate your cut-off machine if the muffler is damaged, missing or modified. An improperly maintained muffler will increase the risk of fire and hearing loss. Never touch a hot muffler or spill fuel or other flammable liquid over it. Burn injuries or fire will result. If your muffler was equipped with a sparkarresting screen to reduce the risk of fire (e. g. in the USA, Canada and Australia), never operate your cut-off machine if the screen is missing or damaged.

In California, it is a violation of § 4442 or

§ 4443 of the Public Resources Code to use or operate gasoline-powered tools on forest-covered, brush-covered or grass-covered land unless the engine’s exhaust system is equipped with a complying spark arrester that is maintained in effective working order. The owner/operator of this product is responsible for properly maintaining the spark arrester. Other states or governmental entities/agencies, such as the U.S. Forest Service, may have similar requirements. Contact your local fire agency or forest service for the laws or regulations relating to fire protection requirements.

For any maintenance please refer to the maintenance chart and to the warranty statement near the end of the instruction manual.

Store wheels on a flat surface in a dry place, preferably at a constant temperature, where there is not a risk of frost. Do not store a cut-off machine with a wheel mounted on the machine. Store cut-off machine in a high or locked place, away from children.

Empty the fuel tank before storing for longer than a few days. Store fuel only in correctly labeled and approved containers. Avoid direct skin contact and do not inhale the gas vapors.

Sample applications

Water connection

– A water attachment kit is mounted

on the machine for use with all types of water supply.

– A pressurized 2.6 gallons (10 liter)

water tank is available from STIHL for wet cutting.

– A water tank for mounting on the

Cutquik cart is also available for wet cutting.

Most diamond cutting wheels are suitable for wet cutting

Wet cut whenever feasible. It increases the service life and cutting speed of diamond cutting wheels.

Ensure that the cutting wheel is generously supplied with water.

Wet cutting helps to suppress dust. The water binds the dust. The cutting wheel must be supplied with

at least 20 fl. oz (0.6 liters) water per minute.

Wet cutting can reduce the energy of reactive forces. In a pinch situation, the water can act as a lubricant.

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Composite resin wheels can be used for dry cutting of metals or for wet or dry cutting of concrete, stone or masonry.

Composite resin wheels designed for dry cutting

Special procedures must be followed when wet cutting with a composite nondiamond wheel designed for dry cutting. See the section entitled "Wet Cutting with Abrasive Wheels" in the safety precautions of this manual. Wet cutting is generally not suitable for cutting metals.

Composite resin wheels designed for wet cutting

Adjust water flow rate during cutting so it is suf ficient to bind all the dust that occurs (at least 20 fl. oz (0.6 L/min)).

If the water flow rate is too high, the cutting wheel may skim on the water surface in the cut and greatly reduce cutting performance. To avoid this, do not exceed a water flow rate of about 135fl.oz (4L/min).

Use water properly:

1. Be certain water is applied to both sides of wheel, since uneven distribution can cause one sided wear with possible wheel breakage.

2. Make certain water does not flow on wheel that is not running, since the wheel will absorb water and that will affect wheel balance.

3. After finishing work, run the cutting wheel at normal operating speed for about 3 to 6 seconds without water so that the remaining water is flung off.

Respiratory protection

WARNING

When wet cutting at the recommended flow rate is not utilized, the operator and any bystanders should always wear a respirator approved by NIOSH/MSHA for the material being cut. Even if wet cutting, an operator who is actively cutting for more than two hours a day should wear at least a NIOSH-approved disposable respirator.

The cutting sequence The cutting sequence is important when

cutting openings and recesses, etc. The last cut must always be made in such a way that the cutting wheel cannot become bound and so that the user is not at risk of being injured by the part that has been cut off or out.

If applicable, leave small ridges of uncut material to hold the severed part in position. These ridges can subsequently be broken through.

A number of points must be decided before the part is finally severed:

– How heavy is the part? – In which direction can it move after

being severed? – Is it under tension? Helpers must not be put at risk of injury

when the part is broken off or out.

Cutting in several passes

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Points to be noted with diamond and composite cutting wheels

Object to be cut

– Must be fully supported – Must be secured so that it cannot

roll or slip away

– Must be protected against vibration

N Mark cutting line (A).

English

N Work along the cutting line. If

corrections are necessary, always reposition the cutting wheel, taking care to ensure that it is not wedged. The cutting depth per pass should not exceed 5 to 6 cm (2“ to 2 1/2“). Thicker material must be cut in several passes.

Cutting slabs

N Secure the slab (e. g. on a non-slip

surface, sandbed).

180BA027 AM

N Cut deeper into the parting cut (B). N Leave a ridge (C) of uncut material. N Cut through the slab at the ends so

the material does not chip.

N Then break the slab.

N Determine sequence of severing

cuts. N Grind a guide groove along the line

marked. N Make cuts deeper along the guide

groove – observe recommended

cutting depth on each pass. For

180BA028 AM

small corrections of direction, do not

tilt the abrasive wheel, but always

position it anew instead. If

necessary, leave small ridges that

hold the part that is to be separated

in position. Break these ridges

manually after the last cut.

Cutting concrete pipe

N Cut a guiding groove (A) along the

marked line.

N Curves must be cut in several

straight passes, taking care to ensure that the cutting wheel does not become wedged.

Cutting pipes, round and hollow bodies

N Secure pipes, round and hollow

bodies against vibrations, slipping and rolling away.

N Note direction of fall and weight of

the severed part.

N Determine and mark the cutting line;

avoid metal reinforcement to the extent possible, especially in the direction of the severing cut.

002BA557 AM

The procedure is dependent on the outer diameter of the pipe and the maximum possible cutting depth of the abrasive wheel (A).

N Secure pipe against vibrations,

slipping and rolling away. N Note weight, tension and direction

of fall of the part to be severed.

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002BA559 AM

N Determine and mark direction of cut. N Determine sequence of cuts.

Outer diameter of pipe is smaller than the maximum cutting depth

N Make one cut from the top to the

bottom

Outer diameter of pipe is greater than the maximum cutting depth

Plan first, then cut. Several cuts are needed – correct sequence is important.

N Turn guard to rear stop.

002BA528 AM

N Always start at the bottom, use the

front and upper part of the abrasive wheel for cutting.

N Use the front and upper part of the

002BA558 AM

abrasive wheel for cutting the opposite lower side. Make sure that the cut at the bottom is complete.

N Next, make a first lateral cut on the

top half of the pipe, connecting with the kerf from the bottom half.

002BA560 AM002BA561 AM002BA562 AM

N A second lateral cut is then made in

the marked area. To keep the pipe

from pinching during this cut, never

cut into the area of the final cut. Only make the final top cut once all

bottom and lateral cuts have been completed and connect with one another.

N Always make the final separating

cut from the top (approx. 15 % of the

pipe circumference). If the

workpiece is properly supported, it

should not pinch when the cut is

completed. If there is any residual

pinching, however, it will be at the

bottom of the wheel, where it may

result in pull-away, but not in

kickback. Be alert for pull-away.

Concrete pipe – cut recess

002BA563 AM

TS 410, TS 420

Sequence of cuts (1 to 4) is important: N First, cut hard-to-reach areas.

English

180BA025 AM

N Always make severing cuts so that

the abrasive wheel is not pinched.

N Use wedges and/or leave ridges

that are broken after cutting.

N If the severed part remains in the

recess after cutting (due to wedges, ridges used), do not make any further cuts – break the severed part.

Cutting wheels Composite resin cutting

wheels

Cutting wheels are exposed to extremely high loads especially during hand-held cutting.

Only use abrasive whhels that comply with ANSI B 7.1 for hand-held machines

180BA024 AM

and are correspondingly labeled. Note that the maximum permissible speed of the cutting wheel must be higher than the maximum spindle speed listed on the wheel guard label.

The cutting wheels that have been developed for STIHL by well-known manufacturers of abrasive wheels are of high quality and tailored precisely to the respective intended use as well as the engine performance of the cut-off machine.

Transport and storage

– Do not expose cutting wheels to

direct sunshine or other thermal stresses during transport and storage.

– Avoid jolting and impacts. – Stack cutting wheels flat on a level

180BA026 AM

surface in the original packaging in a dry place where the temperature is as constant as possible.

– Do not store cutting wheels in the

vicinity of aggressive fluids.

– Store cutting wheels in a frost-free

place.

Types:

– for dry applications – for wet applications

Economic benefit is improved and premature wear can be avoided by choosing and using the correct composite resin cutting wheel. The short name (e.g. “asphalt“, “concrete“)

– on the label and – on the packaging (table with

recommended uses) can help to ensure the correct choice. STIHL composite resin cutting wheels

are suitable, depending on the version, for cutting the following materials:

– Asphalt – Concrete – Stone – Ductile cast pipes – Steel; STIHL composite resin

cutting wheels cannot be used to cut

railway tracks. Do not cut any other materials – risk of

accident!

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Diamond cutting wheels

For wet applications. Economic benefit is improved and

premature wear can be avoided by choosing and using the correct diamond cutting wheel. The short name (see following explanation)

– on the label and – on the packaging (table with

recommended uses) can help to ensure the correct choice. STIHL diamond cutting wheels are

suitable, depending on the version, for cutting the following materials:

– Asphalt – Concrete – Stone (hard rock) – Abrasive concrete – Green concrete – Clay bricks – Clay pipes – Ductile iron – Structural steel up to 10 mm thick

Do not cut any other materials. Cut-off machines are not suitable for cutting certain metals and other substances.

Never use diamond abrasive wheels with abrasive material on their sides, since in a pinch situation, they can result in extreme kickback – Risk of severe or fatal injury.

Short names

The short name is a combination of letters and numerals with up to four digits:

– The letters indicate the main area of

use for the cutting wheel.

– The numerals indicate the

performance class of the STIHL diamond cutting wheel.

Letter Main area of use A Asphalt B Concrete BA Concrete, Asphalt S Stone (rock) SB* Rock, Concrete

can be used for structural steel up to 10 mm thick and ductile iron – not suitable for continuous cutting of such materials

Radial and axial run-out

A correctly mounted spindle bearing on the cut-off machine is essential for a long service life and efficient operation of the diamond cutting wheel.

Using a cutting wheel on a cut-off machine with defective spindle bearing can lead to axial and radial run-out.

Excessive radial run-out (A) causes individual diamond segments to be overloaded and to overheat. This can in turn lead to stress cracking in the wheel core or to softening of individual segments.

Axial run-out or spindle wobble (B) results in higher thermal stress and wider cuts.

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Troubleshooting

Cutting wheel

Problem Cause Remedy Frayed edges or tears, cut wanders out

Radial or axial run-out Consult a dealer of line, increased wear at the sides of the segments

Cutting wheel wobbles Use a new cutting wheel Frayed edges, cut wanders out of line, lit

tle or no cutting performance, sparking

Cutting wheel is blunt; built-up edges on cut

ting wheels for stone

Dress the cutting wheel for stone by briefly cutting in abrasive material; use a new cutting wheel for cutting asphalt

Poor cutting performance, high level of segment wear

Chipping or cracking in the wheel core and segments

Undercutting Cutting in a material for which the wheel is

STIHL recommends that a STIHL servicing dealer be consulted.

Cutting wheel rotates in the wrong direction Mount the cutting wheel with correct

direction of rotation

Overload Replace immediately with a new cutting

wheel Use a new cutting wheel; note the differ

not rated

ent cutting layers in different materials

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Undercut

Undercutting is a wearing away of the steel core at or just below the diamond segments. When cutting road surfaces, do not cut through into the more abrasive ballast (gravel, crushed rock) below, as indicated by a light colored dust. This can cause excessive undercutting, resulting in wheel breakage and/or thrown segments.

WARNING

Immediately replace a diamond wheel if the core has been severely undercut.

Built-up edges, dressing

Built-up edges can form: – when cutting extremely hard

material, such as granite,

– as a result of incorrect handling,

such as applying excessive feed force.

Built-up edges increase vibrations, reduce cutting performance and cause sparking.

Diamond cutting wheels must be "dressed" at the first sign of built-up edges. For this purpose, briefly cut a more abrasive material, such as sandstone, aerated concrete or asphalt.

Wet cutting helps to prevent the formation of built-up edges.

WARNING

Such cutting wheels may break apart or throw off segments during use or lead to significant reactive forces, causing serious or fatal injury. Replace them immediately.

Built-up edges are identified by a pale grey deposit on the top of the diamond segments that clogs and blunts the segments.

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If you continue to use a cutting wheel with blunt segments, the segments may soften as a result of excessive heat built up. The wheel core will also overheat and lose its mechanical strength. This can lead to considerable stress, as clearly indicated by stress cracks and/or a wobbling movement of the cutting wheel.

English

1307BA001 KN

370BA085 KN

Electronic water control

STIHL cut-off machines may be equipped with an electronic water control system.

The electronic water control makes it possible to feed the optimum amount of water to the cutting wheel. No water is fed to the cutting wheel during idling or when the machine is turned off.

Before starting work

N Familiarize yourself with the control

panel and sequence of motions while the engine is switched off.

N All of the control panel buttons can

be reached with the thumb of the right hand while the right hand remains on the rear handle.

N The left hand always remains on the

handlebar.

Control Panel

When the engine is running, it is possible to activate/deactivate the electronic water control and adjust the water flow.

1 Button (+):

activates the electronic water control or increases water flow to cutting wheel.

2 Button (–):

activates the electronic water control or decreases water flow to cutting wheel.

3 Deactivates electronic water

control; no water is fed to the cutting wheel.

Using the Electronic Water Control

N Start engine: see the chapter

"Starting/Stopping the Engine."

N Briefly push the (+) button or (–)

button with the thumb of the right hand. The right hand must always remain on the rear handle while doing so; the left hand must always remain on the handlebar. No water is fed to the cutting wheel during idling.

During use, the set amount of water is fed to the cutting wheel.

N Adjust water flow if necessary – to

do so, briefly push the (+) button or (–) button with the thumb of the right hand until the correct water quantity is attained at one of the settings.

The right hand must always remain on the rear handle while doing so; the left hand must always remain on the handlebar.

The water pressure will affect the actual amount of water flow at any setting. It may be necessary to use a higher setting with a lower water pressure, e.g., when using a pressurized or gravity water tank. For proper dust suppression and cutting performance, always make sure that the water flow is within the proper range, as described in the chapter "Sample Applications."

If the cut-off machine is idling after use, no more water will be fed to the cutting wheel – the electronic water control, however, remains activated. With continued use, the last setting will be automatically re-entered.

If the engine is stopped and restarted, the electronic water control is switched off.

Maintenance and Care

If too little water or no water is fed to the cutting wheel during use although the electronic water control has been activated:

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370BA086 KN

370BA068 KN

370BA069 KN

370BA070 KN

N remove the coupling sleeve (1); N unscrew the "water connection with

screen" (2) and rinse under running water – the screen remains on the water connection.

Assembling the cast arm and guard

The "cast arm with guard" is mounted on the inboard side by the manufacturer.

The "cast arm with guard" can also be mounted on the outboard side depending on requirements.

Assembly on the inboard side is recommended for freehand cutting on account of the better balance.

Outboard mounting

N Disassemble the cutting wheel (see

“Fitting / replacing an cutting wheel”)

Remove water attachment

Removing the adjusting lever

N Unscrew the banjo bolt (1) with the

combination wrench and remove it together with the seal – in the process, remove the square nut from the inside of the guard from the guide

N Remove screw (2) N Turn the adjusting lever (3) upwards

and remove

Slackening the V-belt

N Unscrew the banjo bolt (1) with the

combination wrench – in the process, remove the square nut from the inside of the guard from the guide

N Remove the water hose (2) with

connector from the adjusting lever (3)

N Pull the water hose (2) out of the

guide (arrows) in the V-belt guard

N Unscrew the nuts (1) – do not

remove them

N Turn the tensioning nut (2)

counterclockwise with the combination wrench – approx. 1/4 turn, as far as it will go = 0

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370BA071 KN

370BA079 KN

370BA072 KN

370BA073 KN

370BA074 KN

4 5

370BA075 KN

Removing the V-belt guard

N Remove screw (1) N Raise the V-belt guard (2) slightly

and pull it off to the front

N Remove the V-belt (3) from the front

pulley (4)

Remove the "cast arm with guard"

N Turn the guard so that it is in the

position shown (see picture)

N Screw in and tighten the stop pin (1) N Move the adjusting lever (2) to

position A

N Screw in the bolt (3) and tighten up N Unscrew the bolt (4) of the limit

stop (5)

N Remove the limit stop (5)

N Unscrew the nuts (1) N Remove the "starter cover with

rewind starter" (2)

N Remove the "cast arm with

guard" (3) from the studs

Preparing the "cast arm with guard" for outboard mounting

N Turn the "cast arm with guard" so

that the guard is on the outboard side

N Insert limit stop (5) – align the hole

in the limit stop with the hole in the cast arm

N Unscrew stop pin (1)

N Screw in the bolt (4) and tighten up

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370BA008 KN

370BA051 KN

370BA077 KN

370BA078 KN

370BA076 KN

N Insert the square nut into the guide

in the guard and hold it in place

N Screw in the shorter banjo bolt (6)

and washer at the adjusting lever and tighten up with the combination wrench

Mount "cast arm with guard" – guard on the outboard side

N Fit the "starter cover with rewind

starter" (5) over the studs (2)

N Tighten up the nuts (6) by hand

N Push the V-belt guard (7) into place N Screw in the bolt (8) and tighten up

Connect water connection

N Fit the support with the longer banjo

bolt on the adjusting lever (3) – screw in the banjo bolt and tighten with the combination wrench

N Insert the water hose into the guide

in the V-belt guard (arrow) from the shut-off cock towards the guard – avoid tight radiuses

Checking the adjustment range of the guard

N Press the oblong holes (1) in the

"cast arm with guard" on to the studs (2), guiding the ribbed V-belt over the front pulley

NOTICE

The belt action must run smoothly. N The belt tensioner (3) must sit close

to the lug (4)

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N Insert the longer banjo bolt (1)

through the connector (2) of the water attachment – observe the position of the connector

N Insert the square nut into the guide

in the guard and hold it in place

N Rotate the guard forwards and

backwards as far as possible – adjustment range (A) must be limited by the stop pin

Continue as described in the chapter “Tensioning the V-belt”.

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370BA080 KN

370BA081 KN

370BA082 KN

370BA083 KN

Inboard mounting

N Disassemble the cutting wheel (see

“Fitting / replacing an cutting wheel”)

N Remove water attachment N Remove the adjusting lever N Slacken the V-belt N Remove the V-belt guard N Remove the "cast arm with guard"

Preparing the "cast arm with guard" for inboard mounting

N Unscrew the screw (1) of the limit

stop (2)

N Remove the limit stop (2)

N Screw in the bolt (1) and tighten up N Unscrew stop pin (3)

N Turn the guard so that it is in the

position shown (see picture)

N Screw in and tighten the stop pin (3) N Install the adjusting lever N Mount "cast arm with guard" – guard

on the inboard side

N Install the V-belt guard N Connect water connection

Check the adjustment range of the guard

N Rotate the guard forwards and

backwards as far as possible – adjustment range (A) must be limited by the stop pin

Continue as described in the chapter “Tensioning the V-belt”.

N Turn the "cast arm with guard" so

that the guard is on the inboard side

N Insert limit stop (2) – align the hole

in the limit stop with the hole in the cast arm

TS 410, TS 420

+ 82 hidden pages