This deposit on the segments for outboard mounting, fasten the Page 19 2 nut 2 counterclockwise with the counterclockwise with the combination wrench — combination wrench — approx. Retighten the hexagon bolts. This ready-to-use fuel mix If STIHL two-stroke engine oil is not contains no benzol or lead, has a high available, use only quality two-stroke oil octane rating and ensures that you designed for use in air-cooled engines.
Page Fueling Other brand-name two-stroke engine Take care not to spill fuel while fueling oils: 25 parts gasoline to 1 part oil and do not overfill the tank. Page 25 Do not let the starter grip snap back — it may break! Guide it back into the continue cranking housing in the opposite direction so that it can rewind properly. With a new engine, pull the starter rope several times to prime the fuel line.
The high quality of these parts always also replace the auxiliary Page Adjusting The Carburetor The carburetor comes from the factory Carefully turn both adjusting screws with a standard setting. Check the standard setting clockwise until they are seated firmly clockwise Let the engine warm up Set idle speed correctly.
Page Spark Arresting Screen In Muffler Clean the soiled spark arresting Whenever the low speed screw L has screen been adjusted, at least one adjustment must also be made on the idle speed If the screen is damaged or heavily adjusting screw LA. Page Checking The Spark Plug operating hours — or sooner if Mount the clip the electrodes are badly eroded. To reduce the risk of arcing and fire If the spark plug comes with a Page 32 Press the spring clip 3 on to the starter post and over the pegs of the pawl with a screwdriver or suitable pliers — the spring clip must point in the clockwise direction — as in the picture TS Page 33 If it tips sideways: increase the spring tension by another turn It must be possible to turn the rope rotor on another half-turn when the rope has been drawn out completely.
If not, the spring has TS Page Replacing The V-Belt Line up the threaded holes in the The cut-off machine can be mounted on bearing plate with the oblong holes Remove the screws 3 from the the STIHL cut-off machine cart FW 20 in the cast arm starter cover special accessory in a few easy steps. Page Storing The Machine Remove the abrasive wheel Thoroughly clean the machine - pay special attention to the cylinder fins and air filter Store machine in a safe and dry place.
Protect against unauthorized use e. Page Maintenance And Care Carburetor Readjust idle speed Adjust electrode gap Spark plug replace after every hours of operation All accessible screws, nuts and bolts not Retighten adjusting screws test, check Antivibration elements Have them replaced by a specialist dealer TS Page 37 extensive dust, etc.
STIHL dealers are Minimize Wear and Avoid regularly given the opportunity to attend Damage training courses and are supplied with the necessary technical information. Observing the instructions in this manual helps reduce the risk of unnecessary If these maintenance operations are not wear and damage to the power tool.
Page Specifications 20 mm Attachment with outer diam- eter mm: 9. Page Special Accessories When repairing the machine, only use for the vibration measurement. Page 44 englisch www. Print page 1 Print document 44 pages. Rename the bookmark. Delete bookmark? Cancel Delete. Delete from my manuals? Sign In OR. Don't have an account? Sign up! Restore password. 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.
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.
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. An improperly tightened fuel cap can loosen or come off and spill quantities of fuel.
Never use a tool to open or close the bayonet filler cap, as this could damage the cap and cause fuel to leak out. Secure the fuel filler cap as tightly as possible after refuelling. This reduces the risk of the cap working loose due to engine vibrations and fuel leaking out. Never attempt to force the cap open by using a tool. It may damage the cap and allow fuel to leak. Before use, make sure that the fuel cap has been properly tightened and any spilled fuel wiped away. 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.
Your cut-off machine is a one-person tool. Do not allow other persons to be near the 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 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 V-belt pulley and turn the wheel. Never attempt to start the cut-off 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 and allow the engine to slow down to idle.
When you pull the starter grip, don't 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. 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. These gases e. To reduce the risk of serious or fatal injury from breathing toxic fumes, never run the cut-off machine indoors or in poorly ventilated locations. Ensure proper ventilation when working in trenches or other confined areas.
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.
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. A water attachment kit is provided with your cut-off machine and should be used for dust suppression when wet cutting is feasible. Consult and follow any federal, state or local laws or regulations with respect to dry and wet cutting.
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. 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. Breathing asbestos dust is dangerous and can cause severe or fatal injury, respiratory illness or cancer. 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. 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 or grease. 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, ice.
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. Never cut metal while standing on a flammable surface, such as wood or tar paper. Where there is a risk of fire, have appropriate fire extinguishing equipment readily available.
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. 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.
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. 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. It is essential to determine the exact direction of the cut before applying the abrasive wheel to the work. Wheels are 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 break or shatter. Do not use abrasive wheels for rough grinding. Large bending stresses occur during such work and abrasive wheels may shatter or break and could cause serious or fatal injury. Do not exceed the maximum operating speed marked on the wheel. Do not use a wheel that has been dropped. Test each new wheel immediately after installation for approximately one minute at maximum speed without cutting, making sure to keep bystanders away.
Do not cut any material for which the abrasive wheel is not authorized. Do not grind on the side of the abrasive wheel. 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. This could result in high frictional forces and thus greatly reduce the engine power available for the actual cutting work.
It could also damage the abrasive wheel. To reduce the risk of electrocution to you or bystanders, do not allow water or sludge to contact live electric wires. To reduce the risk of injury from wheel breakage when wet cutting with a composite non-diamond wheel:. Never store and re-use a wheel that has been used with water. Use these wheels up the same day. Make certain water does not flow on a wheel that is not running, since the wheel will absorb water, which will affect wheel balance.
Shut water off before the wheel stops so that excess water will be dissipated. Be certain water is applied to both sides of wheel, since uneven distribution can cause "one sided" wear. At correct idle speed, the wheel should not turn. For directions to adjust idle speed, see the appropriate section of your instruction manual.
Do not use a cut-off machine with incorrect idle speed adjustment. The rotating wheel may cause injury. Reactive forces may occur at any time the cutting wheel on a cut-off machine is rotating.
If the wheel is slowed or stopped by frictional contact with any solid object or by a pinch, reactive forces may occur instantly and with great force. These reactive forces may result in the operator losing control of the cut-off machine, which may, in turn, 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 pinch. 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. If the wheel is severely pinched at the front, especially in the upper quadrant, the wheel may be instantly thrown up and back towards the operator with great force in a rotational kickback motion.
The greater the force generated, the more difficult it will be for the operator to control the cut-off machine. Any of the reactive forces can, in some circumstances, cause the operator to lose control of a cut-off machine, allowing the rotating wheel to come into contact with the operator.
Severe personal injury or death can result. To reduce the risk of kickback injury, avoid cutting with the upper quadrant of the wheel where possible. Be especially cautious for a pinching of the wheel in this area, which can cause severe reactive forces in a rotational kickback motion. Be alert to potential movement of the work piece or anything else that could cause the cut to close and pinch the wheel.
In order to reduce the risk of pinching, support the work piece 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. Be particularly alert when cutting a work piece that, if not properly supported, can sag upon completion of the cut, creating a pinch not where you are actually cutting but, rather, at or near the top of the work piece see illustration.
If that pinch is in the upper quadrant of the abrasive wheel, kickback can result. Never use chipped abrasive wheels, circular saw blades, carbidetipped blades, rescue blades or woodcutting 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 which 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.
To reduce the risk of injury from loss of control from reactive forces, including kickback:. Hold the cut-off machine firmly with both hands. Maintain good balance and footing at all times.
Never cut while standing on a ladder. 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. Never bend over the cutting attachment, especially when the guard is pulled back towards the top and there is a risk of reactive forces. Do not cut above shoulder height. Do not cut wood or any other material for which the abrasive wheel is not authorized.
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.
Begin cutting and continue at full throttle. Use your cut-off machine for cutting only. It is not designed for prying or shoveling away any objects. Be especially alert for reactive forces, including kickback, when cutting with the front and upper quadrant of the wheel. Be alert to shifting of the work piece or anything that could cause the cut to close and pinch the wheel, especially in the upper quadrant. Support the work piece in such a way that the cut remains open.
Use wet cutting if feasible. In a pinch situation the water can act as a lubricant and reduce the energy of reactive forces. 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. 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 pinching of the wheel.
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. 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 claim warranty for a component which has not been serviced or maintained properly or if nonapproved replacement parts were used, STIHL may deny warranty.
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 section of your owner's manual. Use of parts manufactured by others may cause serious or fatal injury. Always stop the machine, make sure that the wheel is stopped, and remove the spark plug boot from the spark plug 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. Clean off grinding dust after finishing work. Tighten all nuts, bolts and screws except the carburetor adjustment screws after each use. Never test the ignition system with spark plug boot removed from spark plug or with unseated spark plug, since uncontained sparking may cause a fire.
Always press spark plug boot snugly onto spark plug terminal of the proper size. Note: If terminal has 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. 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.
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. 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, up to 10 liters per minute. Wet cutting can reduce the energy of reactive forces. In a pinch situation, the water can act as a lubricant. Composite resin cutting wheels can be used for dry cutting of metals or for wet or dry cutting of concrete, stone or masonry. Special procedures must be followed when dry cutting with a composite nondiamond wheel. Wet cutting is generally not suitable for cutting metals.
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. If corrections are necessary, always reposition the cutting wheel, taking care to ensure that it is not wedged.
Thicker material must be cut in several passes. Advance the cutting wheel along the guiding groove at full cutting depth. Always reposition the cutting wheel, taking care not to wedge it, if the cutting direction has to be corrected slightly. If necessary, leave small ridges of uncut material to hold the severed part in position.
Particular care and precision are required for free-hand cutting along such cutting lines. Avoid side-loading the wheel or causing it to bind. Always reposition the cutting wheel afresh, taking care not to wedge it if the cutting direction has to be corrected slightly. Economic benefit is improved and premature wear can be avoided by choosing and using the correct composite resin cutting wheel. The short name e. 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. The short name is a combination of letters and numerals with up to four digits:. 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 wobble B results in higher thermal stress and wider cuts. 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. Built-up edges are identified by a pale grey deposit on the top of the diamond segments that clogs and blunts the segments. Built-up edges increase vibrations, reduce cutting performance and cause sparking.
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. Such cutting wheels may break apart or throw off segments during use, causing serious or fatal injury.
Replace them immediately. The bearing with guard can be mounted on the inboard or outboard side of the cast arm, depending on requirements. Assembly on the inboard side is recommended for freehand cutting on account of the better balance; outboard mounting is recommended when the machine is mounted on a STIHL cut-off machine cart. This machine is equipped with an automatic spring-loaded V-belt tensioning device.
If not:. The tensioning nut is spring-loaded: the combination wrench must therefore be held securely! The spring force begins to act on the tensioning nut after approx.
The V-belt is automatically tensioned by the force of the spring in this position. The abrasive wheels are subjected to extremely high loads, especially when cutting free-hand.
The abrasive wheels developed by STIHL in cooperation with leading wheel manufacturers are of very high quality and precisely matched to the application in question, as well as to the engine power of the respective cut-off machines. They are of consistently outstanding quality, with high axial and radial runout. The catches of the front thrust washer must engage in the arbor grooves. Two diamond wheels of the same type can also be used together if a wider cut is required e.
It is essential to ensure that the segments are positioned exactly side by side in such a case. However, two composite abrasive wheels must never be used simultaneously, for they can break and cause injuries as they wear down unevenly. This engine is certified to operate on unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of Your engine requires a mixture of highquality gasoline and quality two-stroke air cooled engine oil.
If the octane rating of the mid-grade gasoline in your area is lower, use premium unleaded fuel.
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