Important Safety Precautions for Chain Saw Users A. Kickback Safety Precautions !Warning! Kickback may occur when the nose or tip of the guide bar touches an object, or when the wood closes in and pinches the saw chain in the cut. Tip contact in some cases may cause a lightning fast reverse reaction, kicking the guide bar up and back towards the operator. Pinching the saw chain along the top of the guide bar may push the guide bar rapidly back towards the operator.
Contents Main Parts of the Saw Definitions Safety Precautions - The Operator - The Saw - The Use of the Saw - Maintaining and Storing the Saw Mounting the Bar and Chain Tensioning the Saw Chain Checking Chain Tension Fuel Fueling Chain Lubricant Filling Chain Oil Tank Checking Chain Lubrication Chain Brake Information Before You Start Starting Oil Quantity Control Taking Care of Guide Bar During Break- in Period During Operation 2 3 4 4 6 6 23 25 26 26 26 27 28 28 28 29 30 30 33 34 34 35 After Finishing
Main Parts of the Saw 2 1 7 14 15 2 19 16 20 18 17 21 143BA033 11 Oil filler cap Muffler Front hand guard Front handle (handlebar) Starter grip Master Control lever Fuel filler cap Throttle trigger Throttle trigger interlock Rear handle Rear hand guard 139BA012 TR 10 6 12 11 = 12 = 13 = 14 = 15 = 16 = 17 = 18 = 19 = 20 = 21 = 9 3 13 Twist lock Spark plug boot Chain sprocket cover Chain sprocket Chain brake Chain catcher Chain tensioner Bumper spike Guide bar Oilomatic saw chain 8 5 4
Definitions 1. Carburetor Box Cover Twist Lock Lock for carburetor box cover. 11. Oil Filler cap For closing the oil tank. 2. Spark Plug Boot Connects the spark plug with the ignition wire. 12. Muffler Reduces engine exhaust noise and directs the exhaust gases. 3. Chain Sprocket Cover Covers the clutch and the sprocket. 4. Chain Sprocket The toothed wheel that drives the saw chain. 5.
Safety Precautions The use of any chainsaw may be hazardous. The saw chain has many sharp cutters. If the cutters contact your flesh, they will cut you, even if the chain is not moving. At full throttle, the chain speed can reach 45 mph (20 m/s). It is important that you read, fully understand and observe the following safety precautions and warnings. Read the Owner’s Manual and the safety instructions periodically. Pay special attention to the section on reactive forces.
reduce the hand’s ability to feel and regulate temperature, produce numbness and burning sensations and may 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.
Wear an approved safety hard hat to protect your head. Chainsaw noise may damage your hearing. Always wear sound barriers (ear plugs or ear mufflers) to protect your hearing. Continual and regular users should have their hearing checked regularly. THE USE OF THE SAW THE SAW Accidental acceleration of the engine can cause the chain to rotate. During operation, the powerhead muffler and the material around it reach extremely high temperatures.
Preparation for the use of the saw Take off the chain guard and inspect for safety in operation. For assembly, follow the procedure described in the chapter “Mounting the Bar and Chain” of your Owner’s Manual. STIHL Oilomatic chain, guide bar and sprocket must match each other in gauge and pitch. Before replacing any bar and chain, see the sections on “Specifications”, "Kickback" and the "ANSI B 175.1-1991 chainsaw kickback standard" in this manual.
!Warning! Unit vibrations can cause an improperly tightened fuel filler cap to loosen or come off and spill quantities of fuel. In order to reduce the risk of fuel spillage and fire, tighten fuel filler cap by hand with as much force as possible. !Warning! Your chainsaw is a one-person saw. Do not allow other persons to be near the running chainsaw. Start and operate your saw without assistance. For specific starting instructions, see the appropriate section of the Owner’s Manual.
!Warning! Important adjustments Be sure that the guide bar and chain are clear of you and all other obstructions and objects, including the ground. When the engine is started, the engine speed with the starting throttle lock engaged will be fast enough for the clutch to engage the sprocket and, if the chainbrake is not activated, turn the chain. If the upper quadrant of the tip of the bar touches any object, it may cause kickback to occur (see section on reactive forces).
eliminated, the operator and any bystanders should always wear a respirator approved by NIOSH / MSHA for the type substance at issue. !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 cut or disturb asbestos, asbestos containing products (e.g.
!Warning! Do not operate your chainsaw with the starting throttle lock engaged. Cutting with the starting throttle lock engaged does not permit the operator proper control of the saw or chain speed. ! Warning! Never touch a chain with your hand or any part of your body when the engine is running, even when the chain is not rotating. The chain continues to rotate for a short period after the throttle trigger is released.
powerful force used to cut wood can be reversed (and work against the operator). If the rotating chain is suddenly stopped by contact with any solid object like a log or branch or is pinched, the reactive forces may occur instantly. These reactive forces may result in loss of control which may, in turn, cause serious or fatal injury. An understanding of the causes of these reactive forces may helpyou avoid loss of control. The most common reactive forces are – kickback, – pushback, – pull-in.
It may also occur during limbing. The greater the force of the kickback reaction, the more difficult it becomes for the operator to control the saw. Many factors influence the occurrence and force of the kickback reaction. These include chain speed, the speed at which the bar and chain contact the object, the angle of contact, the condition of the chain and other factors. The type of bar and saw chain you use is an important factor in the occurrence and force of the kickback reaction.
!Warning! Devices for reducing the risk of kickback injury Never operate your chainsaw without a front hand guard. In a kickback situation this guard helps protect your left hand or other parts of your body. In addition, removal of the hand guard on a saw equipped with a chain brake will deactivate the chain brake. STIHL recommends the use of the STIHL Quickstop chain brake on your powerhead with green labeled reduced kickback bars and low kickback chains.
!Warning! An improperly maintained chain brake may increase the time needed to stop the chain after activation, or may not activate at all. !Warning! Never run the chainsaw above idle speed for more than 3 seconds when the chain brake is engaged or the chain is pinched or otherwise caught in the cut. Clutch slippage can cause excessive heat, leading to severe damage of the motor housing, clutch and oiler component and may interfere with the operation of the chain brake.
Low kickback chain Some types of saw chain have specially designed components to reduce the force of nose contact kickback. STIHL has developed low kickback chain for your powerhead. “Low kickback saw chain” is a chain which has met the kickback performance requirements of § 5.12.2.4 of ANSI B 175.1-1991 (Safety Requirements for Gasoline-Powered ChainSaws) when tested on a selected representative sample of chainsaws below 3.8 cubic inch displacement specified in ANSI B 175.1-1991.
Cutting Techniques Felling 001BA038 LÄ 001BA037 LÄ Felling is cutting down a tree. Before felling a tree, consider carefully all conditions which may affect the direction of fall, including: A = Pull-in: B = Pushback: The intended direction of the fall. Pull-in occurs when the chain on the bottom of the bar is suddenly stopped when it is pinched, caught or encounters a foreign object in the wood. The reaction of the chain pulls the saw forward and may cause the operator to lose control.
1/ 2 1 21/2 001BA088 LÄ 1 Felling Instructions: 001BA041 LÄ 001BA040 LÄ When felling, maintain a distance of at least 21/2 tree lengths from the nearest person. When felling in the vicinity of roads, railways and power lines, etc., take extra precautions. Inform the police, utility company or railway authority before beginning to cut. Escape path Buttress roots The noise of your engine may drown any warning call.
001BA042 LÄ 001BA019 KN Gunning sight Conventional cut Open-face technique When making the felling notch, use the gunning sight on the shroud and housing to check the required direction of fall: A = felling notch - determines the direction of the fall A = felling notch - determines the direction of the fall • For a conventional cut: For an open-face cut: • • Position the saw so that the gunning sight points exactly in the direction you want the tree to fall.
• • • For medium sized or larger trees make cuts at both sides of the trunk, at same height as subsequent felling cut. Cut to no more than width of guide bar. This is especially important in soft wood in summer - it helps prevent sapwood splintering when the tree falls. B = Felling cut Conventional and open-face technique: Begin 1 to 2 inches higher than center of felling notch Cut horizontalIy towards the felling notch Leave approx.1/10 of diameter uncut.
Felling cut for large diameter trees: Be extremely careful with partially fallen trees which are poorly supported. When the tree hangs or for some other reason does not fall completely, set the saw aside and pull the tree down with a cable winch, block and tackle or tractor. If you try to cut it down with your saw, you may be injured. Warning! Felling a tree that has a diameter greater than the length of the guide bar requires use of either the sectioning felling cut or plunge-cut method.
First, cut a large, wide felling notch. Make a plunge cut in the center of the notch. The plunge cut is made with the guide bar nose. Begin the plunge cut by applying the lower portion of the guide bar nose to the tree at an angle. Cut until the depth of the kerf is about the same as the width of the guide bar. Next, align the saw in the direction in which the recess is to be cut. With the saw at full throttle, insert the guide bar in the trunk. Enlarge the plunge cut as shown in illustration.
MAINTENANCE, REPAIR AND STORING 2. Cut only one log at a time. 3. Shattered wood should be cut very carefully. Sharp slivers of wood may be caught and flung in the direction of the operator of the saw. 4. When cutting small logs, place log through “V” - shaped supports on top of a sawhorse. Never permit another person to hold the log. Never hold the log with your leg or foot.
changing the saw chain or cleaning the saw. Do not attempt any maintenance or repair work not described in your Owner’s Manual. Have such work performed at your STIHL service shop only. !Warning! Never test the ignition system with ignition wire terminal removed from spark plug or with 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.
Mounting the Bar and Chain 3 • 145BA001 K You can run chains of different pitches on this chainsaw - depending on the chain sprocket (see "Specifications") The chain pitch must match the guide bar. In addition the drive link gauge must match the guide bar groove width. • 143BA003 KN 1 2 Unscrew nuts and take off cover - • • • Disengage the chain brake: Pull hand guard (3) toward the front handle. Wear work gloves to protect hands Fit the chain - start at the bar nose.
Checking Chain Tension Tensioning the Saw Chain Fuel • • • Retensioning during cutting work: Turn off the engine and then slacken the nuts. Hold the bar nose up and use screwdriver to turn tensioning screw (1) clockwise until chain fits snugly against the underside of the bar while still holding bar nose up, tighten down the nuts firmly. Go to section "Checking Chain Tension". 143BA007 KN 1 133BA024 KN This engine is certified to operate on unleaded gasoline and oil with the mix ratio 50:1.
Fueling We recommend STIHL 50:1 two-stroke engine oil since it is specially formulated for use in STIHL engines. Do not use BIA or TCW (two-stroke water cooled) mix oils! Take care when handling gasoline. Avoid direct contact with the skin and avoid inhaling fuel vapour (see “Safety Precautions”). 143BA008 KN The fuel tank and the canister in which fuel mix is stored should be cleaned from time to time.
Chain lubricant Filling Chain Oil Tank Checking Chain Lubrication For automatic and reliable lubrication of the chain and guide bar: Use only a quality, environmentally compatible chain and bar lubricant. STIHL chain lubricant with non-fling additive or the rapidly biodegradable STIHL Bioplus is recommended. If special chain lubricant is not available, you may - in an emergency - use an HD single grade or multigrade engine oil with a viscosity that suits the prevailing outside temperature.
Chain Brake The chain brake is also activated by the inertia of the front hand guard if the kickback force of the saw is high enough: The hand guard is accelerated toward the bar nose - even if your left hand is not behind the hand guard, e.g. during felling cut. The chain brake will operate only if the hand guard has not been modified in any way. 143BA011 KN 143BA012 KN Check operation of chain brake Locking chain with chain brake - in an emergency - when starting - at idling speed.
Starting STOP 0 4 3 1 The four positions of the Master Control lever To start the engine, move the lever to the “cold start” position l (1) - do not use force. If the Master Control lever is in the “run” position # (3): Press down the throttle trigger interlock and move the Master Control downward. “Cold Start” position: Choke shutter is closed throttle trigger is in starting-throttle position. This position is used to start a cold engine.
• • 044 Place your saw on the ground make sure you have a firm footing check that chain is not touching any object or the ground bystanders must be well clear of general work area of the saw. Hold the saw firmly on the ground with your left hand on the front handle - your thumb should be under the handle. Put your right foot into the rear handle and press down.
STOP 5 • 4 • 143BA021 KN 3 When engine begins to fire: Move Master Control lever (3) to n and continue cranking as soon as engine runs, immediately blip the throttle trigger (4) - the Master Control lever (3) will move to the “Run” # position (5) and the engine settles down to idle speed. As the chain brake is still engaged, the engine must be returned to idle speed immediately to avoid damage to the engine and chain drive (clutch, chain brake).
Oil Quantity Control 139BA001 KN 1 132BA001KN 1 • • • • • • Pull the prefilter (1) upward and out Pull off the spark plug boot (2) Unscrew and dry off the spark plug Set the Master Control lever to b Crank the engine several times with the starter to clear the combustion chamber Refit the spark plug and connect the spark plug terminal reassemble all other parts. Set Master Control lever to “Warm Start” n even if engine is cold. Now start the engine.
Taking Care of Guide Bar During Break- in Period 2 Chain type Pitch Minimum groove depth Rapid 3/8" 6.0 mm (0.24") If groove depth is less than specified: Replace the guide bar. 1 • 3 143BA026 KN The drive link tangs will otherwise scrape along the bottom of the groove - the cutters and tie straps will not ride on the bar rails. Turn the bar over - every time you sharpen the chain - and every time you replace the chain this avoids one-sided wear, especially at nose and underside of the bar.
During Operation Check chain tension frequently. A new chain has to be retensioned more often than one that has been in use for some time. Chain cold: Tension is correct when chain fits snugly against the underside of the bar and can still be pulled along the bar by hand. Retension if necessary see section "Tensioning the Saw Chain". Chain at operating temperature: The chain stretches and begins to sag. The drive links must not come out of the bar groove - the chain may otherwise jump off the bar.
Air Filter System Cleaning Standard Filter Remove the filter 137BA013 KN When there is a noticeable loss of engine power Knock the filter out on the palm of your hand or blow it out with compressed air from the inside outward. • en Ob OP T T AU H The air filter system can be adapted to suit different operating conditions by simply installing a choice of filters. Standard wire mesh filter (1) (green) for normal operating conditions and winter operation.
HD Filter* 2 2 1 Clean the felt prefilter (1) when there is a noticeable loss of engine power After cleaning felt prefilter several times: Separate the filter components Knock out the HD filter (2) and blow it out with compressed air from the inside outward • • In case of stubborn dirt or sticky filter fabric: Wash the filter with STIHL universal cleaner or in a clean, non-flammable cleaning solution (e.g. warm soapy water) Rinse the filter, from the inside outward, under a low-pressure water jet.
Electrically Handle Heating* Winter Operation 1 At temperatures below +10 °C/+50 °F preheat carburetor as follows: At temperatures below -10 °C (+14 °F): • It is advisable to fit the cover plate* on the fan housing if you use your saw in extremely cold conditions (temperatures below -10 °C/+14 °F, in powder or drifting snow). Remove the carburetor box cover. Inside the carburetorbox cover: Move shutter (1) from summer position to winter position (2).
Adjusting Carburetor Motor management Setting idle speed Exhaust emissions are controlled by the design of the fundamental engine parameters and components (e.g. carburetion, ignition, timing and valve or port timing) without the addition of any major hardware. It is usually necessary to change the setting of the idle speed adjusting screw (LA) after every correction to the low speed adjusting screw (L).
A • If engine is down on power, check the spark arresting screen in the muffler: Allow muffler to cool down. • • • • • • • 40 Take out the four screws. Remove the muffler upper casing (4). Bend back the retaining tabs (5). Pull out the spark arresting screen (6). Clean spark arresting screen if necessary. If screen is damaged or coked up, fit a new one. Refit the spark arresting screen in the reverse sequence. Use only resistor type spark plugs of the approved range.
Replacing Starter Rope and Rewind Spring 2 1 3 133BA014 KN 1 1 4 4 001BA096 KN 1 5 2 3 • • • • 044 133BA016 KN 4 001BA096 KN 4 Remove the screws (1) Push the hand guard upward Pull underside of fan housing away from crankcase and remove it downward. Use screwdriver or suitable pliers to carefully remove spring clip (2) from the starter post.
Checking and Replacing Chain Sprocket 001BA104 ST 6 • • • • • • Release the rotor Let go of rope slowly so that it winds onto the rotor. The starter grip must locate firmly in the rope guide bush. If the grip droops to one side: Add one more turn on rope rotor to increase spring tension. When starter rope is fully extended it must be possible to rotate the rotor at least another half turn. If this is not possible, the spring is overtensioned and could break. Take one turn off the rope.
Ordering Spare Parts Please enter your saw model, machine number as well as the part numbers of the guide bar, saw chain and chain sprocket in the spaces provided. K This will make re-ordering simpler. Rim sprocket • • • Use a screwdriver to remove the E-clip. Take off the washer and rim sprocket.
Maintaining and Sharpening Saw Chain Correctly sharpened chain A Do not work with a dull or damaged chain as it will increase the physical effort required, produce unsatisfactory results and a higher rate of wear. Clean and check your chain for cracks in the links and damaged rivets replace any damaged or worn parts of the chain and match the new parts to the shape and size of the original parts. Important: It is absolutely imperative to comply with the angles and dimensions specified below.
689BA025 KN 90° As these requirements can be met only after sufficient and constant practice: File correctly Use a file holder.* A file holder must be used for manual resharpening of Super chain. The correct filing angle is marked on the file holder. • • • • • 80° 30° 35° 10° 0° 689BA022 KN 90° 85° 70° 60° 689BA018 KN • • For checking angles STlHL filing gauge* (see table) A universal tool for checking the filing and side plate angles, depth gauge setting and cutter length.
a Depth gauge distance “a” (mm) mm (Inch) Depth gauge setting 1/4 3/8-PM 3/8-PMN 0.325 3/8 0.404 (6.35) (9.32) (9.32) (8.25) (9.32) (10.26) 0.65 0.65 0.45 0.65 0.65 0.80 (0.026) (0.018) (0.026) (0.026) (0.026) (0.031) The depth gauge determines the height at which the cutter enters the wood and thus the thickness of the chip removed. This setting may be increased by 0.2 mm (0.008") for cutting softwood in mild weather season - no frost.
Throttle trigger , trigger interlock, Master Control Check operation Chain brake Filter in fuel tank Fuel tank Chain oil tank Chain lubrication Saw chain Guide bar Chain sprocket Air filter Cooling inlets Cylinder fins Carburetor Spark plug All accessible screws and nuts (not adjusting screws)* Rubber vibration buffers Spark arresting screen in muffler Chain catcher Check operation Check by STIHL dealer Check Clean, Replace filter element Replace Clean Clean Check Inspect, also check sharpness Check cha
Specifications Engine STIHL single cylinder two-stroke engine Displacement: Bore: Stroke: Idle speed: Maximum engine speed (cut-off speed): 70.7 cm3 (4.31 cu.in) 50 mm (1.97 in) 36 mm (1.42 in) 2,500 r.p.m. 13,500 rpm Ignition System Type: Electronic magneto ignition (breakerless) Spark plug (suppressed): Bosch WSR 6 F or NGK BPMR 7 A Heat range 200 Electrode gap 0.5 mm (0.02 in) Spark plug thread: M 14x1.25; 9.5 mm (0.
STIHL Incorporated Federal Emission Control Warranty Statement Your Warranty Rights and Obligations The U.S. Environmental Protection Agency (EPA) and STIHL Incorporated are pleased to explain the Emission Control System Warranty on your equipment type engine. In the U.S. new 1997 and later model year small off-road equipment engines must be designed, built and equipped, at the time of sale, to meet the U.S. EPA regulations for small non road engines.
purchaser that your engine is free from defects in materials and workmanship which cause the engine to fail to conform with applicable regulations for a period of two years. Mechanical diagnostic work will be performed at an authorized STIHL servicing dealer. Emission test may be performed either at STIHL Incorporated or at any independent test laboratory.
Continuation of Important Safety Precautions 4. Use caution when handling fuel. Move the chainsaw at least 10 feet (3 m) from the fueling point before starting the engine. 5. Do not allow other persons to be near the chainsaw when starting or cutting with the chainsaw. Keep bystanders and animals out of the work area. 6. Do not start cutting until you have a clear work area, secure footing, and a planned retreat path from the falling tree. 7.