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This Instruction Manual refers to a STIHL chain saw, also called a machine in this Instruction Manual.
Pictograms that appear on the machine are explained in this Instruction Manual.
Depending on the machine and equipment version, the following pictograms may appear on the machine.
Fuel tank; fuel mixture of gasoline and engine oil
Tank for chain oil; chain oil
Engage and release chain brake
Coasting brake
Direction of chain travel
Ematic; chain oil flow adjustment Tension saw chain
Intake air baffle: winter operation
Intake air baffle: summer operation
Handle heating
Actuate decompression valve
Actuate manual fuel pump
Warning where there is a risk of an accident or personal injury or serious damage to property.
NOTICE
Caution where there is a risk of damaging the machine or its individual components.
STIHL's philosophy is to continually improve all of its products. For this reason we may modify the design, engineering and appearance of our products periodically.
Therefore, some changes, modifications and improvements may not be covered in this manual.
Special safety precautions must be observed to reduce the risk of personal injury when working with a chain saw because of the very high chain speed and very sharp cutters.
It is important that you read the instruction manual before first use and keep it in a safe place for future reference. Non-observance of the instruction manual may result in serious or even fatal injury.
Observe all applicable local safety regulations, standards and ordinances.
The use of noise emitting power tools may be restricted to certain times by national or local regulations.
If you have not used this model before: Have your dealer or other experienced user show you how to operate your machine or attend a special course in its operation.
Minors should never be allowed to use a chain saw.
Keep bystanders, especially children, and animals away from the work area.
The user is responsible for avoiding injury to third parties or damage to their property.
Do not lend or rent your chain saw without the instruction manual. Be sure that anyone using it understands the information contained in this manual.
To operate a chain saw you must be rested, in good physical condition and mental health. If you have any condition that might be aggravated by strenuous work, check with your doctor before operating a chain saw.
Do not operate the chain saw if you are under the influence of any substance (drugs, alcohol) which might impair vision, dexterity or judgment.
To reduce the risk of accidents or injury, put off the work in poor weather conditions (rain, snow, ice, wind).
Persons with pacemakers only: The ignition system of your chain saw produces an electromagnetic field of a very low intensity. This field may interfere with some pacemakers. To reduce health risks, STIHL recommends that persons with pacemakers consult their physician and the pacemaker manufacturer before operating this power tool.
The machine may only be used to saw wood and wooden objects.
Do not use the machine for any other purpose – risk of accidents!
Do not modify the machine in any way – this may increase the risk of personal injury. STIHL excludes all liability for personal injury and damage to property caused while using unauthorised attachments.
Wear proper protective clothing and equipment.
Clothing must be sturdy and snug-fitting, but allow complete freedom of movement. Wear snug fitting clothing with cut-retardant pads – no loose-fitting jacket.
Avoid clothing that could get caught on branches, brush or moving parts of the machine. Do not wear a scarf, necktie or jewellery. Tie up and confine long hair (headscarf, cap, hard hat, etc.).
Wear suitable safety shoes – with cutretardant material, non-slip soles and steel toe caps.
To reduce the risk of eye injuries, wear tight-fitting safety goggles conforming to standard EN 166 or a face shield. Make sure that the safety goggles and the face shield fit correctly.
Wear "personal" hearing protection – for example, ear defenders.
Wear a hard hat wherever there is any risk of falling objects.
Wear sturdy protective gloves made of a resistant material (e.g. leather).
STIHL can supply a comprehensive range of personal protective equipment.
Before any transport – even over short distances – switch off the machine, engage the chain brake and attach the chain scabbard. This avoids the risk of the saw chain starting unintentionally.
Always carry the chain saw by the handle – with the hot muffler away from your body, the guide bar must point to the rear. To avoid serious burn injuries, avoid touching hot parts of the machine, especially the surface of the muffler.
In vehicles: Properly secure your saw to prevent turnover, fuel spillage and damage.
Clean plastic parts with a cloth. Harsh detergents can damage the plastic.
Clean the dust and dirt off the machine – do not use any grease solvents for this purpose.
Clean the ventilation slots if necessary.
Do not use a high-pressure cleaner to clean the machine. The hard jet of water can damage parts of the machine.
Only use those tools, guide bars, chains, chain sprockets, accessories or technically equivalent components that have been approved by STIHL for this machine. If you have any questions in this respect, consult a servicing dealer. Use only high quality tools and accessories. Otherwise, there may be a risk of accidents and damage to the machine.
STIHL recommends the use of genuine STIHL tools, guide bars, chains, chain sprockets and accessories. They are specifically designed to match your model and meet your performance requirements.
Gasoline is an extremely flammable fuel – keep clear of naked flames and fire – do not spill any fuel – no smoking.
Switch off the engine before refuelling.
Never refuel the machine while the engine is still hot – the fuel may spill over – risk of fire!
Open the fuel filler cap carefully so that any excess pressure is relieved gradually and fuel does not splash out.
The machine may only be refuelled in a well ventilated place. Clean the machine immediately if
fuel is spilled. Do not spill fuel over your clothing – contaminated clothing must be changed immediately.
The machines can be equipped with the following filler caps as standard:
Cliplock filler cap (bayonet-type)
Place the cliplock filler cap (bayonet-type) in position, turn as far as stop and fold the cliplock down.
This helps reduce the risk of unit vibrations causing an incorrectly tightened filler cap to loosen or come off and spill quantities of fuel.
Look out for leaks! Never start the engine if fuel has been spilled or is leaking – Fatal burns may result!
Check that your saw is properly assembled and in good condition – refer to appropriate chapters in the instruction manual.
To reduce the risk of personal injury, do not operate your saw if it is damaged or not properly assembled.
Always work on a level surface. Ensure a firm and secure footing. Hold the machine securely – the chain must not touch any objects or the floor – danger of injury due to the rotating saw chain.
Your chain saw is a one-person saw. Do not allow other persons to be in the working area – not even while starting.
Do not start the chain saw if the chain is in a cut.
Move at least 3 meters away from the place where the machine was refuelled and never start the motor in enclosed spaces.
Lock the chain with the chain brake before starting – risk of injury due to rotating chain!
Do not drop-start the engine – start as described in the Instruction Manual.
Ensure you always have a firm and safe footing. Take special care when the bark is wet – danger of slipping!
Always hold the chain saw firmly with both hands: Right hand on the rear handle – even if you are left-handed. To ensure reliable control, wrap your thumbs tightly around the handlebar and handle.
In the event of impending danger or in an emergency, switch off the engine immediately by moving the Master Control lever / stop switch to STOP, 0 or
Never let the machine run unattended.
Exercise caution with slippery surfaces, water, snow, ice, steep slopes, uneven ground or green wood that has just been stripped of its bark – danger of slipping!
Use caution with tree stumps, roots, ditches – danger of stumbling!
Do not work alone – keep within calling distance of others who are trained in emergency procedures and can provide help in an emergency. Helpers at the cutting site must also wear protective clothing (helmet!) and stand well clear of the branches being cut.
More care and attention than usual are required when wearing ear protection, as warning sounds (shouts, beeps, etc.) cannot be heard properly.
Take a break in good time to avoid tiredness or exhaustion – risk of accidents!
Dust (e. g., sawdust), fumes and smoke produced while using the machine may be hazardous to health. If dust is generated, wear a dust mask.
When the engine is running: Note that the saw chain continues to rotate for a short period after you let go of the throttle trigger – coasting effect.
No smoking when working with or near the chain saw - risk of fire! Combustible fuel vapour may escape from the fuel system.
Examine the saw chain periodically at short intervals and as soon as you note any tangible changes:
Never touch the saw chain when the engine is running. If the saw chain becomes jammed by an object, switch off the engine immediately before attempting to remove the object – risk of injury!
Always turn off the engine before leaving the machine unattended.
To change the saw chain, switch off the engine. Risk of injury from the motor starting unintentionally!
Keep easily combustible materials (e. g., wood chips, bark, dry grass, fuel) away from hot exhaust gases and hot mufflers – risk of fire! Mufflers with catalytic converters can become especially hot.
Never work without chain lubrication – monitor the oil level in the oil tank. Stop work immediately if the oil level in the oil tank is too low and top up with chain oil – see also "Topping up with chain oil" and "Check chain lubrication".
If the machine is subjected to unusually high loads for which it was not designed (e. g., heavy impact or a fall), always check that it is in good condition before continuing work – see also "Before starting work".
Check the fuel system for leaks and make sure the safety devices are working properly. Never continue using a machine that is not in perfect working order. In case of doubt, have the unit checked by your servicing dealer.
Check for correct idling, so that the saw chain stops moving when the throttle trigger is released. Check the idle setting regularly and correct when possible. Have the machine repaired by a STIHL servicing dealer if the saw chain still continues to move during idling.
The chain saw produces poisonous exhaust gases as soon as the engine starts. These gases may be colourless and odourless and may contain unburnt hydrocarbons and benzene. Never work with the machine indoors or in poorly ventilated areas, even if your machine is equipped with a catalytic converter.
Ensure proper ventilation when working in trenches, hollows or other confined locations – risk of fatal injury from breathing toxic fumes!
If you feel sick, have a headache, vision problems (e. g., your field of vision gets smaller), hearing problems, dizziness or inability to concentrate, stop work immediately. Such symptoms may be caused by an excessively high concentration of exhaust emissions – risk of accident!
Switch off the motor, engage the chain brake and attach the chain scabbard.
When the machine is not in use, it should be stored in such a way that no-one is endangered. Secure the machine against unauthorised use.
Store the machine in a safe, dry room.
Prolonged use of the power tool may result in vibration-induced circulation problems in the hands (whitefinger disease).
No general recommendation can be given for the length of usage because it depends on several factors.
The period of usage is prolonged by:
The period of usage is shortened by:
Continual and regular users should monitor closely the condition of their hands and fingers. If any of the above symptoms appear (e.g. tingling sensation in fingers), seek medical advice.
Always switch off the engine before any repair, cleaning or maintenance work and any work on the chain. Risk of injury if the engine starts inadvertently!
Exception: adjustment of carburetor and idle speed.
The machine must be serviced regularly. Do not attempt any maintenance or repair work not described in the Instruction Manual. All other work should be carried out by a servicing dealer.
STIHL recommends that maintenance and repair work be carried out only by authorised STIHL dealers. STIHL dealers receive regular training and are supplied with technical information.
Use only high-quality spare parts. Otherwise, there may be a risk of accidents and damage to the machine. If you have any questions in this respect, consult a servicing dealer.
Do not modify the machine in any way – this may increase the risk of personal injury –risk of accidents!
To reduce the risk of fire due to ignition outside the cylinder, move the master control level to STOP, 0 or before turning the engine over on the starter when the spark plug boot is removed or the spark plug is unscrewed!
Do not service or store the machine near a naked flame – risk of fire due to the fuel.
Check fuel cap regularly for tightness.
Use only spark plugs that are in perfect condition and have been approved by STIHL – see "Specifications".
Check ignition lead (insulation in good condition, secure connection).
Check that the muffler is in perfect working condition.
Do not use the machine if the muffler is damaged or missing – risk of fire, damage to hearing!
Never touch a hot muffler – risk of burns!
The condition of the anti-vibration elements influences vibration behaviour – inspect anti-vibration elements periodically.
Inspect chain catcher – replace if damaged.
Switch off the engine
Observe sharpening instructions – for safe and proper handling, always keep the chain and guide bar in flawless condition. Keep the chain properly sharpened, tensioned and well lubricated.
Change chain, guide bar and chain sprocket in due time.
Regularly check that the clutch drum is in perfect working condition.
Always store fuel and chain lubricant only in the specified type of containers and ensure they are correctly labelled. Store in a dry, cool and secure place protected against light and sunlight.
In the event of a chain brake malfunction, switch off the machine immediately – risk of injury! Consult a servicing dealer – do not use the machine until the malfunction has been remedied, see "Chain brake".
The most common reactive forces that occur during cutting are: kickback, pushback and pull-in.
Kickback can result in serious or fatal injury.
(Kickback) occurs when the saw is suddenly thrown up and back in an uncontrolled arc towards the operator.
This device reduces the risk of injury in certain situations – it cannot prevent kickback. When activated, the chain brake stops the saw chain within a fraction of a second – see the section "Saw chain" in this Instruction Manual.
(A)
Pull-in occurs when the chain on the bottom of the bar is suddenly pinched, caught or encounters a foreign object in the wood. The reaction of the chain pulls the saw forward – to reduce this risk, always engage the spiked bumper securely in the tree or limb.
(B)
Pushback occurs when the chain on the top of the bar is suddenly pinched, caught or encounters a foreign object in the wood.
The reaction of the chain drives the saw straight back toward the operator – to avoid this risk:
In these cases, do not use a chain saw – use a hoist, winch or drag line instead.
Pull out exposed and cleared logs. Select clear area for cutting.
Deadwood (dry, decayed or rotted wood) represents a considerable risk that is difficult to assess. Identifying the extent of the dangers is complicated, if not impossible. Use aids such as a cable winch or tractor in such cases.
When felling in the vicinity of roads, railways, power lines, etc., take extra precautions. If necessary, inform the police, utility company or railway authority.
Sawing and felling work, including all related work (plunge cutting, limbing, etc.) may only be carried out by persons who have been specially trained and instructed. Persons who are not experienced chain saw users should not carry out any such work – increased risk of accidents!
Country-specific legislation on felling technique must be complied with during felling work.
Do not operate your saw with the starting throttle lock engaged. Engine speed cannot be controlled with the throttle trigger in this position.
Work calmly and carefully – in daylight conditions and only when visibility is good. Ensure you do not endanger others – stay alert at all times.
It is advisable for first-time users to practice cutting logs on a sawbuck – see "Sawing thin wood".
Use the shortest possible guide bar: The chain, guide bar and chain sprocket must match each other and your saw.
Position the saw so that your body is clear of the cutting attachment.
Always pull the saw out of the cut with the chain running.
Use your chain saw for cutting only. It is not designed for prying or shoveling away limbs, roots or other objects.
Do not underbuck freely hanging limbs.
Be careful when cutting scrub and young trees. Thin shoots can be scooped up by the chain saw and hurled towards the user.
Be careful when cutting splintered wood – Risk of injury from ejected pieces of wood!
Make sure your saw does not touch any foreign materials: Stones, nails, etc. may be flung off and damage the saw chain. The chain saw may kick back unexpectedly – risk of accident!
If a rotating saw chain hits a stone or another hard object, sparks may be generated which may ignite easily flammable materials under certain conditions. Also dried-out plants and brushwood are combustible, above all in hot and dry weather. If there is a risk of fire, do not use the chain saw in the vicinity of easily combustible materials, dry plants or scrub. It is mandatory that you ask the responsible forestry office about the current fire hazard.
If on a slope, stand on the uphill side of the log. Watch out for rolling logs.
When working at heights:
Begin cutting with the saw at full throttle and engage the spiked bumper firmly in the wood, and then continue cutting.
Never work without the spiked bumper because the saw may pull you forwards and off balance. Always hold the spiked bumper securely against the tree or limb.
At the end of the cut, the chain saw is no longer supported by the cutting attachment in the cut. The chain saw's weight must be borne by the user – risk of loss of control!
Sawing thin wood:
Limbing
Lying or standing logs under tension:
Always make the cuts in the correct order (first compression side (1), then tension side (2)), otherwise the cutting attachment may stick in the cut or kick back – risk of injury!
Be wary of pushback when making bucking cut from the bottom upwards (underbuck).
NOTICE
Do not cut a lying log at a point where it is touching the ground because the saw chain will otherwise be damaged.
Ripping:
Sawing technique without use of the spiked bumper – risk of pull-in – position the guide bar at as shallow an angle as possible – be especially careful – increased risk of kickback!
Check that there are no other persons in the felling area – other than helpers.
Make sure no-one is endangered by the falling tree – the noise of your engine may drown any warning calls.
Maintain a distance of at least 2 1/2 tree lengths from the next felling site.
Determining direction of fall and escape path
Select gap in stand into which you want the tree to fall.
Pay special attention to the following points:
Preparing work area at base of tree
Preparing the felling notch
The felling notch (C) determines the direction of fall.
Determine direction of fall with gunning sight on cover and fan housing
Your chainsaw has a gunning sight on the cover and fan housing. Use this gunning sight.
Making the felling notch
When making a felling notch, align the chainsaw so that the notch lies at a right angle to the direction of fall.
During the procedure, various sequences are permitted for making a felling notch with a bottom (horizontal) cut and top (angled) cut – comply with national legislation regarding felling technique.
Checking the direction of fall
Sapwood cuts in long-fibered softwood help prevent sapwood splintering when the tree falls. Make cuts at both sides of the trunk at same height as bottom of felling notch to a depth of about 1/10 of trunk diameter. On large diameter trees, cut to no more than width of guide bar.
Do not make sapwood cuts if wood is diseased.
Basic dimensions
The felling notch (C) determines the direction of fall.
The hinge (D) functions like a real hinge to guide the tree to the ground.
The tree is felled with the felling cut (E).
The holding strap (F) or stabilizing strap (G) supports the tree and helps prevent it from falling prematurely.
Plunge cutting
Where possible, use a plunge blade. The plunge blade and the upper/lower side of the guide bar are parallel.
During plunge cutting, the plunge bar helps to keep the hinge parallel in form, i.e. the same thickness at all points. To do this, guide the plunge bar parallel to the sink chord.
Felling wedges
Insert the felling wedge as soon as possible, i.e. as soon as no obstruction of saw control is to be expected. Position the felling wedge in the felling cut and drive in with suitable tools.
Only use aluminum or plastic wedges – do not use steel wedges. Steel wedges can seriously damage the saw chain and cause dangerous kickback.
Select suitable felling wedges dependent on the trunk diameter and the width of the kerf (analogue to felling cut (E)).
Contact the STIHL dealer for the selection of the felling wedge (suitable length, width and height).
The selection of the appropriate felling cut is dependent on the same tree characteristics that must be noted when determining the direction of fall and the escape paths.
There are various different features of these characteristics. This User Manual will only describe the two most commonly occurring variants:
left: | Normal tree – vertically upright tree with uniform crown |
right: | Leaner tree - crown pointing in direction of fall |
Implement this felling cut when the trunk diameter is smaller than the cutting length of the chainsaw.
Shout a warning before starting the felling cut.
Shout a second warning immediately before the tree falls.
Implement this felling cut when the trunk diameter is greater than the cutting length of the machine.
Shout a warning before starting the felling cut.
The felling cut must be continued on the opposite side of the trunk.
Ensure that the second cut is at the same level as the first cut.
Shout a second warning immediately before the tree falls.
Implement this felling cut when the trunk diameter is smaller than the cutting length of the chainsaw.
Shout a second warning immediately before the tree falls.
Perform this felling cut when the tree diameter is greater than the cutting length of the chainsaw.
The felling cut must be continued on the opposite side of the trunk.
Ensure that the second cut is at the same level as the first cut.
Shout a second warning immediately before the tree falls.
A cutting attachment consists of the saw chain, guide bar and chain sprocket.
The cutting attachment that comes standard is designed to exactly match the chain saw.
If non-matching components are used, the cutting attachment may be damaged beyond repair after a short period of operation.
Your saw comes standard with a chain scabbard that matches the cutting attachment.
If guide bars of different lengths are mounted to the saw, always use a chain scabbard of the correct length which covers the complete guide bar.
The length of the matching guide bars is marked on the side of the chain scabbard.
Wear work gloves to protect your hands from the sharp cutters.
Put on protective gloves – risk of injury by the sharp cutters.
When fitting the chain sprocket cover, the teeth of the adjusting wheel and the tensioning gear must mesh; if necessary,
Retensioning during cutting work:
A new chain has to be retensioned more often than one that has been in use for some time.
Retensioning during cutting work:
A new chain has to be retensioned more often than one that has been in use for some time. 10 Checking Chain Tension
A new chain has to be retensioned more often than one that has been in use for some time.
The engine requires a mixture of gasoline and engine oil.
Avoid direct skin contact with fuel and breathing in of gasoline fumes.
STIHL recommends using STIHL MotoMix. This pre-blended fuel is free of benzene and lead, is distinguished by a high octane rating, and always provides the proper mixing ratio.
STIHL MotoMix uses STIHL HP Ultra two-stroke engine oil for optimum engine life.
MotoMix is not available in all markets.
NOTICE
Unsuitable fuels or a mixing ratio that deviates from the specification can lead to severe engine damage. The engine, seals, fuel lines and fuel tank may be damaged if low-quality gasoline or engine oil is used.
Use only high-quality gasoline with an octane rating of at least 90 ROC – leaded or unleaded.
Gasoline with an alcohol component exceeding 10% can cause impaired engine performance in engines with manually adjustable carburetors and thus should not be used in these engines.
Engines with M-Tronic deliver full engine performance using gasoline with an alcohol component of up to 27% (E27).
If you mix the fuel yourself, use only STIHL two-stroke engine oil or another high-performance engine oil classified as JASO FB, JASO FC, JASO FD, ISO-L-EGB, ISO-L-EGC or ISO-LEGD.
STIHL specifies STIHL HP Ultra two-stroke engine oil or an equivalent high-performance engine oil in order to maintain emission limits over the machine's service life.
with STIHL two-stroke engine oil 1:50; 1:50 = 1 part oil + 50 parts gasoline
Quantity of gasoline Liters | STIHL two-stroke engine oil 1:50 | |
Liters | (ml) | |
1 | 0.02 | (20) |
5 | 0.10 | (100) |
10 | 0.20 | (200) |
15 | 0.30 | (300) |
20 | 0.40 | (400) |
25 | 0.50 | (500) |
Store in approved safety fuel canisters only in a dry, cool and secure place protected against light and sunlight.
Fuel mixture deteriorates with age – mix only as much as needed for a few weeks. Do not store fuel mixture for longer than 30 days. The fuel mixture can become unusable more quickly if exposed to light, sunlight or low or high temperatures.
STIHL MotoMix however can be stored for up to 5 years without any problems.
Pressure may have built up in the canister – open it carefully.
Residual fuel and the liquid used for cleaning must be disposed of in accordance with regulations and without harming the environment!
Take care not to spill fuel while fueling and do not overfill the tank.
STIHL recommends you use the STIHL filler nozzle for fuel (special accessory).
Grip must be vertical:
Bottom of cap is twisted in relation to top.
Left: | Bottom of cap is twisted – inner mark (1) in line with outer mark. |
Right: | Bottom of cap in correct position – inner mark is under the grip. It is not in line with the outer mark. |
For automatic and reliable lubrication of the chain and guide bar – use only an environmentally compatible quality chain and bar lubricant. Rapidly biodegradable STIHL BioPlus is recommended.
NOTICE
Biological chain oil must be resistant to aging (e.g. STIHL BioPlus), since it will otherwise quickly turn to resin. This results in hard deposits that are difficult to remove, especially in the area of the chain drive and chain. It may even cause the oil pump to seize.
The service life of the chain and guide bar depends on the quality of the lubricant. It is therefore essential to use only a specially formulated chain lubricant.
Do not use waste oil. Renewed contact with waste oil can cause skin cancer. Moreover, waste oil is environmentally harmful.
NOTICE
Waste oil does not have the necessary lubricating properties and is unsuitable for chain lubrication.
If the oil level in the tank does not go down, the reason may be a fault in the oil supply system: Check chain lubrication, clean the oilways, contact your dealer for assistance if necessary STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer.
The saw chain must always spin off a small amount of oil.
NOTICE
Never operate your machine without chain lubrication. If the saw chain runs dry, the cutting attachment may very quickly be damaged beyond repair. Before starting work, always check the chain lubrication and oil level in the tank.
Every new saw chain needs a run-in time of 2 to 3 minutes.
After the saw chain has run in, check the tension of the chain and correct if necessary – see "Checking the chain tension".
Press the hand guard towards the nose of the guide bar with the left hand - or automatically due to kickback: Saw chain is blocked - and stops running.
NOTICE
The chain brake must be released before opening the throttle (except during functional checkout) and before sawing.
Running the engine at high revs with the chain brake engaged (chain locked) will quickly damage the engine and chain drive (clutch, 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.
Before starting work: Run engine at idle speed, engage the chain brake (push hand guard towards bar nose) and open the throttle wide for (no more than 3 seconds) – the chain must not rotate. The hand guard must be free of dirt and easily moveable.
The chain brake is subject to (normal wear). It is necessary to have it serviced and maintained regularly by trained personnel. STIHL recommends that maintenance and repair work be carried out only by authorised STIHL dealers. The following intervals must be complied with:
Full-time use: | quarterly |
Part-time use: | every six months |
occasional use: | annually |
Heated air is now drawn in from around the cylinder and circulates around the carburetor – this helps prevent carburetor icing.
In case of erratic idling behavior or poor acceleration
Whenever the low speed screw (L) has been adjusted, it is usually also necessary to adjust the idle speed adjusting screw (LA), see "Setting the carburetor".
Stop 0 – engine off – the ignition is switched off
Normal run position – engine runs or can fire.
Starting throttle – this position is used to start a warm engine. The Master Control lever moves to the normal run position as soon as the throttle trigger is squeezed.
Choke shutter closed – this position is used to start a cold engine.
To move the Master Control lever from the normal run position () to choke closed (
), press down the throttle trigger lockout and squeeze the throttle trigger at the same time and hold them in that position – now set the Master Control lever. 18 Starting / Stopping the Engine
To select the starting throttle position (), move the Master Control lever to choke closed (
) first, then push it into the starting throttle position (
).
The Master Control lever must be in the choke closed position () for the changeover to the starting throttle position (
).
The Master Control lever moves from the starting throttle position () to the run position (
) when you press down the throttle trigger lockout and blip the throttle trigger at the same time.
To switch off the engine, move the Master Control lever to Stop (0).
()
()
Press the manual fuel pump bulb several times – even if the bulb is already filled with fuel:
There are two ways of holding the saw when starting.
Machines without additional manual fuel pump: If the engine is new or after a long out-of-service period, it may be necessary to pull the starter rope several times to prime the fuel system.
This machine is extremely simple and easy to start, even for children – risk of accidents.
Do not allow children or other unauthorized persons to attempt to start or otherwise use the machine:
The ErgoStart stores the energy required to start the saw. For this reason there may be a delay of a few seconds between cranking the engine and it actually starting.
There are two ways of starting with the ErgoStart:
Bystanders must be well clear of the general work area of the saw.
Choke shutter closed ()
Starting throttle position ()
NOTICE
As the chain brake is still engaged, the engine must be returned to idling speed immediately – or the engine housing and chain brake might otherwise be damaged.
The chain brake is now disengaged – your saw is ready for operation.
NOTICE
Always disengage chain brake before accelerating the engine. High revs with the chain brake engaged (chain locked) will quickly damage the clutch and chain brake.
If you did not move the Master Control lever from the choke closed position ) to the starting throttle position (
) quickly enough after the engine began to fire, the combustion chamber may be flooded.
A factory new machine should not be run at high revs (full throttle off load) for the first three tank fillings. This avoids unnecessarily high loads during the break-in period. As all moving parts have to bed in during the break-in period, the frictional resistances in the shortblock are greater during this period. The engine develops its maximum power after about 5 to 15 tank fillings.
NOTICE
Do not make the mixture leaner to achieve an apparent increase in power – this could damage the engine – see "Adjusting the Carburetor".
NOTICE
Open the throttle only when the chain brake is off. Running the engine at high revs with the chain brake engaged (chain locked) will quickly damage the shortblock and chain drive (clutch, chain brake).
A new saw chain must be retensioned more frequently than one that has been in use already for an extended period.
Tension is correct when the chain fits snugly against the underside of the bar but can still be pulled along the bar by hand. Retension if necessary – see "Tensioning the Saw Chain".
The chain stretches and begins to sag. The drive links must not come out of the bar groove on the underside of the bar – the chain may otherwise jump off the bar. Retension the chain – see "Tensioning the Saw Chain".
NOTICE
The chain contracts as it cools down. If it is not slackened off, it can damage the crankshaft and bearings.
After a long period of full-throttle operation, allow engine to run for a while at idle speed so that the heat in the engine can be dissipated by flow of cooling air. This protects engine-mounted components (ignition, carburetor) from thermal overload.
NOTICE
Always slacken off the chain again after finishing work. The chain contracts as it cools down. If it is not slackened off, it can damage the crankshaft and bearings.
Wait for engine to cool down. Keep the machine with a full tank of fuel in a dry place, well away from sources of ignition, until you need it again.
See "Storing the machine"
Chain type | Chain pitch | Minimum groove depth |
Picco | 1/4" P | 4.0 mm |
Rapid | 1/4" | 4.0 mm |
Picco | 3/8" P | 5.0 mm |
Rapid | 3/8"; 0.325" | 6.0 mm |
Rapid | 0.404" | 7.0 mm |
If groove depth is less than specified:
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.
The air filter system can be adapted to suit different operating conditions by installing different filters. Changing a filter is accomplished quickly and simply.
Different air filters are available for suit different conditions.
NOTICE
To avoid damaging the filter, do not use tools for removing and installing the air filter.
Wash the filter thoroughly if knocking it out or blowing it clear is not sufficient to remove stubborn dirt, or if the filter fabric is sticky.
Washing the filter
The carburetor comes from the factory with a standard setting.
The carburetor has been adjusted for optimum performance and fuel efficiency in all operating states.
If the saw chain continues to keep rotating in idle even after adjustment, have the chain saw checked by a servicing dealer.
The idle setting is too lean.
Whenever the low speed adjusting screw (L) has been adjusted, it is usually also necessary to readjust the idle speed adjusting screw (LA).
The setting may have to be marginally corrected if engine performance is unsatisfactory at high altitudes:
NOTICE
After descending from a high altitude, restore the carburetor setting to the standard setting. If you make the setting too lean it will increase the risk of engine damage through lack of lubrication and overheating.
Possible causes are:
Arcing may occur if the adapter nut (1) is loose or missing. Working in an easily combustible or explosive atmosphere may cause a fire or an explosion. This can result result in serious injuries or damage to property.
For periods of about 30 days or longer
Using two saw chains in alternation helps preserve the chain sprocket.
STIHL recommends use of original STIHL chain sprockets in order to ensure optimal functioning of the chain brake.
A properly sharpened saw chain cuts through wood effortlessly even with very little pushing.
Never use a dull or damaged saw chain – this leads to increased physical strain, increased vibration load, unsatisfactory cutting results and increased wear.
Carbide-tipped (Duro) saw chains are especially wear-resistant. For an optimal sharpening result, STIHL recommends STIHL servicing dealers.
Compliance with the angles and dimensions listed below is absolutely necessary. An improperly sharpened saw chain – especially depth gauges that are too low – can lead to increased kickback tendency of the chain saw – risk of injury!
The chain pitch marking (a) is embossed in the area of the depth gauge of each cutter.
Marking (a) | Chain pitch | |
Inches | mm | |
7 | 1/4 P | 6.35 |
1 or 1/4 | 1/4 | 6.35 |
6, P or PM | 3/8 P | 9.32 |
2 or 325 | 0.325 | 8.25 |
3 or 3/8 | 3/8 | 9.32 |
4 or 404 | 0.404 | 10.26 |
The diameter of file to be used depends on the chain pitch – see table "Sharpening tools".
The angles of the cutter must be maintained during resharpening.
Tooth shapes | Angle (°) | |
A | B | |
Micro = semi-chisel tooth, e. g., 63 PM3, 26 RM3, 36 RM | 30 | 75 |
Super = full chisel tooth, e. g., 63 PS3, 26 RS, 36 RS3 | 30 | 60 |
Ripping chain, e. g., 63 PMX, 36 RMX | 10 | 75 |
The angles must be identical for all cutters in the saw chain. Varying angles: Rough, uneven running of the saw chain, increased wear – even to the point of saw chain breakage.
Always use a file holder (special accessory, see table "Sharpening tools") when sharpening saw chains by hand. File holders have markings for the sharpening angle.
Use only special saw chain files! Other files are unsuitable in terms of shape and type of cutting.
STIHL filing gauge (special accessory, see table "Sharpening tools") – a universal tool for checking sharpening and side plate angles, depth gauge setting, and tooth length, as well as cleaning grooves and oil inlet holes.
All cutters must be equally long.
With varying cutter lengths, the cutter heights also vary and cause rough running of the saw chain and chain breakage.
The depth gauge determines the depth to which the cutter penetrates the wood and thus the chip thickness.
When cutting softwood outside of the frost season, the distance can be increased by up to 0.2 mm (0.008").
Chain pitch | Depth gauge Distance (a) | ||
Inches | (mm) | mm | (Inches) |
1/4 P | (6.35) | 0.45 | (0.018) |
1/4 | (6.35) | 0.65 | (0.026) |
3/8 P | (9.32) | 0.65 | (0.026) |
0.325 | (8.25) | 0.65 | (0.026) |
3/8 | (9.32) | 0.65 | (0.026) |
0.404 | (10.26) | 0.80 | (0.031) |
The depth gauge setting is lowered when the cutter is sharpened.
Saw chains with humped drive link (2) – upper part of the humped drive link (2) (with service mark) is lowered at the same time as the depth gauge of the cutter.
The rest of the humped drive link must not be filed; otherwise, this could increase the tendency of the chain saw to kick back.
Depth gauges that are too low increase the kickback tendency of the chain saw.
Sharpening tools (special accessories)
1) STIHL recommends STIHL servicing dealer
2) When using professional chainsaws (with a power output of 3.4 kW or more) for the first time, tighten the cylinder block screws after 10 to 20 hours of operation
Observing the instructions in this manual helps reduce the risk of unnecessary wear and damage to the power tool.
The power tool must be operated, maintained and stored with the due care and attention described in this owner's manual.
The user is responsible for all damage caused by non-observance of the safety precautions, operating and maintenance instructions in this manual. This includes in particular:
All the operations described in the "Maintenance Chart" must be performed on a regular basis. If these maintenance operations cannot be performed by the owner, they should be performed by a servicing dealer.
STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. STIHL dealers are regularly given the opportunity to attend training courses and are supplied with the necessary technical information.
If these maintenance operations are not carried out as specified, the user assumes responsibility for any damage that may occur. Among other parts, this includes:
Some parts of the power tool are subject to normal wear and tear even during regular operation in accordance with instructions and, depending on the type and duration of use, have to be replaced in good time. Among other parts, this includes:
STIHL single-cylinder two-stroke engine
MS 231, MS 231 C
Displacement: 42.6cm3
Cylinder bore: 42.5 mm
Piston stroke: 30 mm
Engine power to ISO 7293:
2.0 kW (2.7 hp) at
10000 1/min
Idle speed:1) 2800 rpm
1) Depending on model
2) according to ISO 11681 +/- 50 1/min
MS 251, MS 251 C
Displacement: 45.6cm3
Cylinder bore: 44 mm
Piston stroke: 30 mm
Engine power to ISO 7293:
2.2 kW (3.0 hp) at
10000 1/min
Idle speed:1) 2800 rpm
Electronic magneto ignition
Spark plug (suppressed): NGK CMR6H, BOSCH USR 4AC
Electrode gap: 0.5 mm
All-position diaphragm carburetor with integral fuel pump
Fuel tank capacity: 390 cm3 (0.39 l)
Fully automatic, speed-controlled oil pump with rotary piston
Oil tank capacity: 200 cm3 (0.2 l)
dry, without cutting attachment
MS 231: | 4.8 kg |
MS 231 C with ErgoStart and quick chain tensioner: | 5.1 kg |
MS 251: | 4.8 kg |
MS 251 C with ErgoStart and quick chain tensioner: | 5.1 kg |
The actual cutting length may be less than the specified cutting length.
Rollomatic E.325" guide bars
Cutting lengths: 35, 40, 45 cm
Pitch: .325" (8.25 mm)
Groove width: 1.3 mm
Sprocket nose: 11-tooth
Rollomatic E.325" guide bars
Cutting lengths: 35, 40, 45 cm
Pitch: .325" (8.25 mm)
Groove width: 1.6 mm
Sprocket nose: 11-tooth
Rollomatic E 3/8" P guide bars
Cutting lengths: 30, 35, 40, 45 cm
Pitch: 3/8" P (9.32 mm)
Groove width: 1.3 mm Sprocket nose: 9 tooth
Saw chains.325"
Rapid Micro Pro (23 RM) Type 3693
Rapid Micro 3 Pro (23 RM3) Type 3695
Pitch: .325" (8.25 mm)
Drive link gauge: 1.3 mm
Saw chains.325"
Rapid Micro 3 (26 RM3) Type 3634
Rapid Duro 3 (26 RD3) Type 3667
Pitch: .325" (8.25 mm)
Drive link gauge: 1.6 mm
Saw chains 3/8" P
Picco Micro 3 (63 PM3) Type 3636
Picco Super 3 (63 PS3) Type 3616
Picco Duro 3 (63 PD3) Type 3612
Pitch: 3/8" P (9.32 mm)
Drive link gauge: 1.3 mm
Chain sprocket
7-tooth for.325" | |
Max. chain speed according to ISO 11681: | 25.6 m/s |
Chain speed at maximum power: | 19.3 m/s |
6-tooth for 3/8" P | |
Max. chain speed according to ISO 11681: | 24.8 m/s |
Chain speed at maximum power: | 18.6 m/s |
For further details on compliance with Vibration Directive 2002/44/EC, see www.stihl.com/vib
Sound pressure level Lpeq in accordance with ISO 22868
MS 231: 103 dB(A)
MS 231 C: 103 dB(A)
MS 251: 103 dB(A)
MS 251 C: 103 dB(A)
Sound power level Lweq in accordance with ISO 22868
MS 231: 113 dB(A)
MS 231 C: 113 dB(A)
MS 251: 113 dB(A)
MS 251 C: 113 dB(A)
MS 251 (for China only): 112 dB(A)
MS 251 C (China only): 112 dB(A)
Vibration level ahv, eq according to ISO 22867
Handle, left | Handle, right | |
MS 231: | 3.9 m/s2 | 3.9 m/s2 |
MS 231 C: | 3.9 m/s2 | 3.9 m/s2 |
MS 251: | 3.9 m/s2 | 3.9 m/s2 |
MS 251 C: | 3.9 m/s2 | 3.9 m/s2 |
The K‑factor in accordance with Directive 2006/42/EC is 2.0 dB(A) for the sound pressure level and sound power level; the K‑factor in accordance with Directive 2006/42/EC is 2.0 m/s2 for the vibration level.
REACH is an EC regulation and stands for the Registration, Evaluation, Authorization and Restriction of Chemical substances.
For information on compliance with the REACH regulation (EC) No. 1907/2006 see www.stihl.com/reach
The CO2 value measured in the EU type approval procedure is specified at www.stihl.com/co2 in the product-specific technical data.
The measured CO2 value was determined on a representative engine in accordance with a standardized test procedure under laboratory conditions and does not represent either an explicit or implied guarantee of the performance of a specific engine.
The applicable exhaust emission requirements are fulfilled by the intended usage and maintenance described in this User Manual. The operating license shall be void if the engine is modified in any way.
Please enter your saw model, serial number as well as the part numbers of the guide bar and saw chain in the spaces provided. This will make re-ordering simpler.
The guide bar and saw chain are subject to normal wear and tear. When purchasing these parts, always quote the saw model, the part numbers and names of the parts.
Model
Serial number
Guide bar part number
Chain part number
Users of this machine may only carry out the maintenance and service work described in this user manual. All other repairs must be carried out by a servicing dealer.
STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. STIHL dealers are regularly given the opportunity to attend training courses and are supplied with the necessary technical information.
When repairing the machine, only use replacement parts which have been approved by STIHL for this power tool or are technically identical. Only use high-quality replacement parts in order to avoid the risk of accidents and damage to the machine.
STIHL recommends the use of original STIHL replacement parts.
Original STIHL parts can be identified by the logo and the STIHL parts symbol
(the symbol may appear alone on small parts).
Here you can download full pdf version of manual, it may contain additional safety instructions, warranty information, FCC rules, etc.
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