STIHL MS 231, 251 Instruction Manual
←
→
Page content transcription
If your browser does not render page correctly, please read the page content below
STIHL MS 231, 251 Instruction Manual
English Contents Guide to Using this Manual 2 Maintaining and Sharpening the Dear Customer, Safety Precautions 3 Saw Chain 39 Thank you for choosing a quality Reactive Forces 8 Maintenance and Care 43 engineered STIHL product. Minimize Wear and Avoid Damage 45 Original Instruction Manual Working Techniques 9 It has been built using modern Cutting Attachment 18 Main Parts 46 production techniques and Specifications 47 comprehensive quality assurance. Mounting the Bar and Chain (side Every effort has been made to ensure chain tensioner) 18 Ordering Spare Parts 48 your satisfaction and trouble-free use of Mounting the Bar and Chain (quick Maintenance and Repairs 49 the product. chain tensioner) 19 Disposal 49 Please contact your dealer or our sales Tensioning the Saw Chain (side EC Declaration of Conformity 49 company if you have any queries chain tensioner) 21 Printing inks contain vegetable oils, paper can be recycled. concerning this product. Tensioning the Saw Chain (quick chain tensioner) 22 Your Checking Chain Tension 22 Fuel 22 Fueling 23 Chain Lubricant 25 Printed on chlorine-free paper Filling Chain Oil Tank 25 Dr. Nikolas Stihl Checking Chain Lubrication 26 Chain Brake 26 Winter Operation 27 Starting / Stopping the Engine 28 Operating Instructions 32 Taking Care of the Guide Bar 33 Shroud 34 Air Filter System 34 © ANDREAS STIHL AG & Co. KG, 2020 Cleaning the Air Filter 35 Adjusting the Carburetor 36 Spark Plug 37 0458-737-0121-B. VB0.J20. Storing the Machine 38 0000006607_011_GB Checking and Replacing the Chain Sprocket 38 This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process with electronic systems. MS 231, MS 231 C, MS 251, MS 251 C 1
English Intake air baffle: winter Engineering improvements Guide to Using this Manual operation STIHL's philosophy is to continually This Instruction Manual refers to a improve all of its products. For this Intake air baffle: summer STIHL chain saw, also called a machine reason we may modify the design, operation in this Instruction Manual. engineering and appearance of our products periodically. Pictograms Handle heating Therefore, some changes, modifications and improvements may not be covered Pictograms that appear on the machine in this manual. are explained in this Instruction Manual. Actuate decompression Depending on the machine and valve equipment version, the following pictograms may appear on the machine. Fuel tank; fuel mixture of Actuate manual fuel gasoline and engine oil pump Tank for chain oil; chain oil Symbols in text Engage and release chain brake WARNING Warning where there is a risk of an Coasting brake accident or personal injury or serious damage to property. Direction of chain travel NOTICE Caution where there is a risk of damaging the machine or its individual components. Ematic; chain oil flow adjustment Tension saw chain 2 MS 231, MS 231 C, MS 251, MS 251 C
English Do not lend or rent your chain saw Clothing and Equipment Safety Precautions without the instruction manual. Be sure that anyone using it understands the information contained in this manual. Wear proper protective clothing and Special safety precau- equipment. tions must be observed to To operate a chain saw you must be reduce the risk of per- rested, in good physical condition and Clothing must be sturdy sonal injury when mental health. If you have any condition and snug-fitting, but allow working with a chain saw that might be aggravated by strenuous complete freedom of because of the very high work, check with your doctor before movement. Wear snug chain speed and very operating a chain saw. fitting clothing with cut- sharp cutters. retardant pads – no Do not operate the chain saw if you are loose-fitting jacket. It is important that you under the influence of any substance (drugs, alcohol) which might impair Avoid clothing that could get caught on read the instruction man- vision, dexterity or judgment. branches, brush or moving parts of the ual before first use and machine. Do not wear a scarf, necktie or keep it in a safe place for To reduce the risk of accidents or injury, jewellery. Tie up and confine long hair future reference. Non- put off the work in poor weather (headscarf, cap, hard hat, etc.). observance of the conditions (rain, snow, ice, wind). instruction manual may Wear suitable safety result in serious or even Persons with pacemakers only: The shoes – with cut-retard- fatal injury. ignition system of your chain saw ant material, non-slip produces an electromagnetic field of a soles and steel toe caps. General very low intensity. This field may interfere with some pacemakers. To reduce health risks, STIHL recommends Observe all applicable local safety that persons with pacemakers consult WARNING regulations, standards and ordinances. their physician and the pacemaker To reduce the risk of eye The use of noise emitting power tools manufacturer before operating this injuries, wear tight-fitting may be restricted to certain times by power tool. safety goggles conform- national or local regulations. ing to standard EN 166 or Intended use a face shield. Make sure If you have not used this model before: that the safety goggles Have your dealer or other experienced The machine may only be used to saw and the face shield fit user show you how to operate your wood and wooden objects. correctly. machine or attend a special course in its operation. Do not use the machine for any other Wear "personal" hearing protection – for Minors should never be allowed to use a purpose – risk of accidents! example, ear defenders. chain saw. Do not modify the machine in any way – Wear a hard hat wherever there is any Keep bystanders, especially children, this may increase the risk of personal risk of falling objects. and animals away from the work area. injury. STIHL excludes all liability for personal injury and damage to property The user is responsible for avoiding caused while using unauthorised injury to third parties or damage to their attachments. property. MS 231, MS 231 C, MS 251, MS 251 C 3
English Wear sturdy protective Clean the dust and dirt off the machine – Open the fuel filler cap carefully so that gloves made of a resist- do not use any grease solvents for this any excess pressure is relieved ant material (e.g. purpose. gradually and fuel does not splash out. leather). Clean the ventilation slots if necessary. The machine may only be refuelled in a well ventilated place. Clean the machine Do not use a high-pressure cleaner to STIHL can supply a comprehensive immediately if fuel is spilled. Do not spill clean the machine. The hard jet of water range of personal protective equipment. fuel over your clothing – contaminated can damage parts of the machine. clothing must be changed immediately. Transport Accessories The machines can be equipped with the following filler caps as standard: Before any transport – even over short Only use those tools, guide bars, chains, Cliplock filler cap (bayonet-type) distances – switch off the machine, chain sprockets, accessories or engage the chain brake and attach the Place the cliplock filler technically equivalent components that cap (bayonet-type) in chain scabbard. This avoids the risk of have been approved by STIHL for this the saw chain starting unintentionally. position, turn as far as machine. If you have any questions in stop and fold the cliplock this respect, consult a servicing dealer. down. Use only high quality tools and accessories. Otherwise, there may be a This helps reduce the risk of unit risk of accidents and damage to the vibrations causing an incorrectly machine. tightened filler cap to loosen or come off and spill quantities of fuel. STIHL recommends the use of genuine 001BA115 KN STIHL tools, guide bars, chains, chain Look out for leaks! Never sprockets and accessories. They are start the engine if fuel has specifically designed to match your been spilled or is leaking Always carry the chain saw by the model and meet your performance – Fatal burns may result! handle – with the hot muffler away from requirements. your body, the guide bar must point to the rear. Avoid touching hot parts of the Refuelling Before Starting Work machine, especially the surface of the muffler – risk of burns! Gasoline is an extremely Check that your saw is properly In vehicles: Properly secure the machine flammable fuel – keep assembled and in good condition – refer to prevent tipping, damage and chain oil clear of naked flames and to appropriate chapters in the instruction or fuel spillage. fire – do not spill any fuel manual. – no smoking. – Check the fuel system for leaks, Cleaning paying special attention to visible Switch off the engine before refuelling. parts such as the tank cap, hose Never refuel the machine while the connections and the manual fuel Clean plastic parts with a cloth. Harsh engine is still hot – the fuel may spill over detergents can damage the plastic. pump (on machines so equipped). If – risk of fire! 4 MS 231, MS 231 C, MS 251, MS 251 C
English there are any leaks or damage, do Your chain saw is a one-person saw. Do Never let the machine run unattended. not start the engine – risk of fire. not allow other persons to be in the Exercise caution with slippery surfaces, Have your saw repaired by a working area – not even while starting. water, snow, ice, steep slopes, uneven servicing dealer before using it Do not start the chain saw if the chain is ground or green wood that has just been again. in a cut. stripped of its bark – danger of slipping! – Check operation of chain brake, Move at least 3 meters away from the Use caution with tree stumps, roots, front hand guard place where the machine was refuelled ditches – danger of stumbling! – Correctly mounted guide bar and never start the motor in enclosed Do not work alone – keep within calling spaces. – Correctly tensioned chain distance of others who are trained in Lock the chain with the chain brake emergency procedures and can provide – The trigger and trigger lockout must before starting – risk of injury due to help in an emergency. Helpers at the move freely and spring back to the rotating chain! cutting site must also wear protective idle position when they are clothing (helmet!) and stand well clear of released. Do not drop-start the engine – start as the branches being cut. described in the Instruction Manual. – Master Control lever must move More care and attention than usual are easily to STOP, 0 or † During operation required when wearing ear protection, – Check that the spark plug boot is as warning sounds (shouts, beeps, etc.) secure – a loose boot may cause cannot be heard properly. arcing that could ignite combustible Ensure you always have a firm and safe footing. Take special care when the bark Take a break in good time to avoid fumes and cause a fire. is wet – danger of slipping! tiredness or exhaustion – risk of – Never attempt to modify the controls accidents! or safety devices in any way. Dust (e. g., sawdust), fumes and smoke – Keep the handles dry and clean – produced while using the machine may free from oil and dirt – for safe be hazardous to health. If dust is control of the saw. generated, wear a dust mask. Make sure there is sufficient fuel When the engine is running: Note that 001BA087 LÄ – and chain oil in the tanks. the saw chain continues to rotate for a To reduce the risk of personal injury, do short period after you let go of the not operate your saw if it is damaged or throttle trigger – coasting effect. not properly assembled. Always hold the chain saw firmly with No smoking when working with or near both hands: Right hand on the rear the chain saw - risk of fire! Combustible Starting the chain saw handle – even if you are left-handed. To fuel vapour may escape from the fuel ensure reliable control, wrap your system. thumbs tightly around the handlebar and Always work on a level surface. Ensure handle. a firm and secure footing. Hold the machine securely – the chain must not In the event of impending danger or in touch any objects or the floor – danger of an emergency, switch off the engine injury due to the rotating saw chain. immediately by moving the Master Control lever / stop switch to STOP, 0 or †. MS 231, MS 231 C, MS 251, MS 251 C 5
English Examine the saw chain periodically at a machine that is not in perfect working Storage short intervals and as soon as you note order. In case of doubt, have the unit any tangible changes: checked by your servicing dealer. When the machine is not in use, it – Switch off the engine; wait until the Check for correct idling, so that the saw should be stored in such a way that no- saw chain is stationary chain stops moving when the throttle one is endangered. Secure the machine trigger is released. Check the idle setting against unauthorised use. – Check condition and secure fitting regularly and correct when possible. – Check sharpness Have the machine repaired by a STIHL Store the machine in a safe, dry room. Never touch the saw chain when the servicing dealer if the saw chain still continues to move during idling. Vibrations engine is running. If the saw chain becomes jammed by an object, switch The chain saw produces off the engine immediately before poisonous exhaust gases Prolonged use of the power tool may attempting to remove the object – risk of as soon as the engine result in vibration-induced circulation injury! starts. These gases may problems in the hands (whitefinger be colourless and odour- disease). Always turn off the engine before leaving the machine unattended. less and may contain No general recommendation can be unburnt hydrocarbons given for the length of usage because it To change the saw chain, switch off the and benzene. Never work depends on several factors. engine. Risk of injury from the motor with the machine indoors starting unintentionally! or in poorly ventilated The period of usage is prolonged by: Keep easily combustible materials areas, even if your – Hand protection (wearing warm (e. g., wood chips, bark, dry grass, fuel) machine is equipped with gloves) away from hot exhaust gases and hot a catalytic converter. – Work breaks mufflers – risk of fire! Mufflers with Ensure proper ventilation when working catalytic converters can become in trenches, hollows or other confined The period of usage is shortened by: especially hot. locations – risk of fatal injury from – Any personal tendency to suffer Never work without chain lubrication – breathing toxic fumes! from poor circulation (symptoms: monitor the oil level in the oil tank. Stop If you feel sick, have a headache, vision frequently cold fingers, tingling work immediately if the oil level in the oil problems (e. g., your field of vision gets sensations). tank is too low and top up with chain oil smaller), hearing problems, dizziness or – Low outside temperatures. – see also "Topping up with chain oil" inability to concentrate, stop work and "Check chain lubrication". – The force with which the handles immediately. Such symptoms may be are held (a tight grip restricts If the machine is subjected to unusually caused by an excessively high circulation). high loads for which it was not designed concentration of exhaust emissions – (e. g., heavy impact or a fall), always risk of accident! Continual and regular users should check that it is in good condition before monitor closely the condition of their continuing work – see also "Before After finishing work hands and fingers. If any of the above starting work". symptoms appear (e.g. tingling sensation in fingers), seek medical Check the fuel system for leaks and Switch off the motor, engage the chain advice. make sure the safety devices are brake and attach the chain scabbard. working properly. Never continue using 6 MS 231, MS 231 C, MS 251, MS 251 C
English Maintenance and repairs Check ignition lead (insulation in good servicing dealer – do not use the condition, secure connection). machine until the malfunction has been remedied, see "Chain brake". Always switch off the engine before any Check that the muffler is in perfect repair, cleaning or maintenance work working condition. and any work on the chain. Risk of injury Do not use the machine if the muffler is if the engine starts inadvertently! damaged or missing – risk of fire, Exception: adjustment of carburettor damage to hearing! and idle speed. Never touch a hot muffler – risk of burns! The machine must be serviced regularly. The condition of the anti-vibration Do not attempt any maintenance or elements influences vibration behaviour repair work not described in the – inspect anti-vibration elements Instruction Manual. All other work should periodically. be carried out by a servicing dealer. Inspect chain catcher – replace if STIHL recommends that maintenance damaged. and repair work be carried out only by authorised STIHL dealers. STIHL Switch off the engine dealers receive regular training and are – To check the chain tension supplied with technical information. – To retension the chain Use only high-quality spare parts. Otherwise, there may be a risk of – To replace the chain accidents and damage to the machine. If – For remedying malfunctions you have any questions in this respect, consult a servicing dealer. Observe sharpening instructions – for safe and proper handling, always keep Do not modify the machine in any way – the chain and guide bar in flawless this may increase the risk of personal condition. Keep the chain properly injury –risk of accidents! sharpened, tensioned and well To reduce the risk of fire due to ignition lubricated. outside the cylinder, move the master Change chain, guide bar and chain control level to STOP, 0 or † before sprocket in due time. turning the engine over on the starter when the spark plug boot is removed or Regularly check that the clutch drum is the spark plug is unscrewed! in perfect working condition. Do not service or store the machine near Always store fuel and chain lubricant a naked flame – risk of fire due to the only in the specified type of containers fuel. and ensure they are correctly labelled. Store in a dry, cool and secure place Check fuel cap regularly for tightness. protected against light and sunlight. Use only spark plugs that are in perfect In the event of a chain brake condition and have been approved by malfunction, switch off the machine STIHL – see "Specifications". immediately – risk of injury! Consult a MS 231, MS 231 C, MS 251, MS 251 C 7
English Kickback occurs if, for example, – Be especially careful with small, Reactive Forces tough limbs, undergrowth and offshoots – the saw chain may The most common reactive forces are: become caught in them kickback, pushback and pull-in. – Never cut several limbs at once – Do not lean too far forward Dangers of kickback – Do not cut above shoulder height 001BA257 KN Kickback can result in – Use extreme caution when re- fatal cuts. entering a previous cut – Do not attempt plunge cuts if you – The saw chain in the area of the are not experienced in this cutting upper quarter of the guide bar nose technique unintentionally comes into contact with wood or a solid object – e. g., – Be alert for shifting of the log or unintentionally touches another limb other forces that may cause the cut during limbing to close and pinch the chain – The saw chain at the nose of the – Always cut with a correctly guide bar is briefly pinched in the cut sharpened, properly tensioned saw chain – the depth gauge setting must not be too large QuickStop chain brake: – Use low-kickback saw chains as well as narrow-radius guide bars This device reduces the risk of injury in certain situations – it cannot prevent Pull-in (A) kickback. If activated, the brake stops the saw chain within a fraction of a second – refer to chapter "Chain brake" in this Instruction Manual. 001BA036 KN Reducing the risk of kickback 001BA037 KN Kickback occurs when the saw is suddenly thrown up and back in an – Work cautiously and methodically uncontrolled arc towards the operator. – Hold the chain saw firmly with both A hands and maintain a secure grip When the chain on the bottom of the bar – Always cut at full throttle – overbucking – is suddenly pinched, caught or encounters a foreign object in – Be aware of the location of the guide the wood, the chain saw may suddenly bar nose – Do not cut with the guide bar nose 8 MS 231, MS 231 C, MS 251, MS 251 C
English be drawn forward toward the log – to Dead wood (brittle, rotten or dead wood) avoid this, engage the bumper spike poses a significant, highly unpredictable Working Techniques firmly in the wood. hazard. It is extremely difficult or even practically impossible to recognise the Sawing and felling work, including all Pushback (B) danger. Use aids such as winches or related work (plunge cutting, limbing, draglines. etc.) may only be carried out by persons When felling close to roads, rail lines, who have been specially trained and power lines, etc., work with particular instructed. Persons who are not care. If necessary, notify police, power experienced chain saw users should not companies or railway authorities. carry out any such work – increased risk of accidents! Country-specific legislation on felling 001BA038 KN technique must be complied with during B felling work. When the chain on the top of the bar – Cutting underbucking – is suddenly pinched, caught or encounters a foreign object in Do not operate your saw with the the wood, the chain saw may suddenly starting throttle lock engaged. Engine be driven straight back toward the speed cannot be controlled with the operator – to avoid this: throttle trigger in this position. – Do not allow the top of the guide bar Work calmly and carefully – in daylight to become jammed conditions and only when visibility is – Do not twist the guide bar in the cut good. Ensure you do not endanger others – stay alert at all times. Be very careful First-time users are advised to practice cutting logs on a sawhorse – see "When – With freely hanging limbs cutting small logs". – With trunks that are under tension Use the shortest possible guide bar: The between other trees because they chain, guide bar and chain sprocket fell unfavourably must match each other and your saw. – When working in windbreaks In these cases, do not use a chain saw – use a hoist, winch or dragline instead. Pull out trunks that are lying about and have been cut free. Whenever possible, deal with them in open areas. MS 231, MS 231 C, MS 251, MS 251 C 9
English materials, dry plants or scrub. Always Note when reaching the end of a cut that contact your local forest authority for the saw is no longer supported in the information on a possible fire risk. kerf. You have to take the full weight of the machine since it might otherwise go out of control. When cutting small logs: 001BA082 KN – Use a sturdy and stable support – sawhorse. Position the saw so that your body is – Never hold the log with your leg or clear of the cutting attachment. foot. Always pull the saw out of the cut with – Never allow another person to hold the chain running. the log or help in any other way. Use your chain saw for cutting only. It is Limbing: not designed for prying or shoveling – Use a low kickback chain. away limbs, roots or other objects. – Work with the saw supported Do not underbuck freely hanging limbs. wherever possible. 001BA033 KN Take care when cutting scrub and young – Do not stand on the log while trees. The saw chain may catch and limbing it. throw thin shoots in your direction. – Do not cut with the bar nose. To reduce the risk of injury, take special If on a slope, stand on the uphill side of care when cutting shattered wood the log. Watch out for rolling logs. – Watch for limbs which are under because of the risk of injury from slivers tension. being caught and thrown in your When working at heights: – Never cut several limbs at once. direction. – Always use a lift bucket Lying or standing logs under tension: Make sure your saw does not touch any – Never work on a ladder or in a tree foreign materials: Stones, nails, etc. may Always make cuts in the correct be flung off and damage the saw chain. – Never work on an insecure support sequence (first at the compression The saw may kick back unexpectedly – – Do not work above shoulder height side (1), then at the tension side (2), the risk of accidents. saw may otherwise pinch or kick back – – Never operate your power tool with risk of injury. If the rotating chain makes contact with one hand a rock or other solid object there is a risk Begin cutting with the saw at full throttle of sparking which may cause easily and engage the spiked bumper firmly in combustible material to catch fire under the wood, and then continue cutting. certain circumstances. Dry plants and scrub are also easily combustible, Never work without the spiked bumper especially in hot and dry weather because the saw may pull you forwards conditions. If there is a risk of fire, do not and off balance. Always engage the use your chainsaw near combustible spiked bumper securely in the tree or limb. 10 MS 231, MS 231 C, MS 251, MS 251 C
English Ripping cut: 1 001BA088 LÄ 2 001BA151 KN 1 1/ 2 1 21/2 Maintain a distance of at least 2 1/2 tree lengths from the next felling site. 2 Determining direction of fall and escape path 1 Select gap in stand into which you want 001BA152 KN the tree to fall. Pay special attention to the following 001BA189 KN points: N Make relieving cut at the – The natural inclination of the tree compression side (1) Cutting technique in which the spiked – Unusually heavy limb structure, N Make bucking cut at the tension asymmetrical growth, damage to bumper is not used – risk of pull-in – start side (2) tree the cut with the guide bar at the Be wary of pushback when making shallowest possible angle – take extra – The wind direction and speed – do bucking cut from the bottom upwards care since there is an increased danger not fell in high winds (underbuck). of kickback. – Direction of slope NOTICE Preparing for felling – Neighboring trees Do not cut a lying log at a point where it – Snow load is touching the ground because the saw Check that there are no other persons in – Take the general condition of the chain will otherwise be damaged. the felling area – other than helpers. tree into account – be especially Make sure no-one is endangered by the careful with trunk damage or falling tree – the noise of your engine deadwood (brittle, rotten or dead may drown any warning calls. wood) MS 231, MS 231 C, MS 251, MS 251 C 11
English Preparing work area at base of tree Felling notch – First clear the tree base and work B area from interfering limbs and Preparing the felling notch brush to provide a secure footing. – Carefully clear the base of the trunk (e.g., with an axe) – sand, stones 45° and other foreign objects will blunt the saw chain A C 45° 001BA146 KN 001BA040 KN B C – Remove largest buttresses: first the A Direction of fall 001BA271 KN largest buttress – saw first vertically, B Escape path (escape routes) then horizontally – only if the tree is – Establish escape paths for each in sound condition worker – approx. 45° diagonally The felling notch (C) determines the opposite to the direction of fall direction of fall. – Clear escape paths, eliminate Important: obstacles – Make a felling notch at right angle to – Put down tools and equipment at a direction of fall safe distance – but not on the escape paths – Saw as close to the ground as possible – When felling, stand only to the side of the falling trunk and only move – Cut to a depth of approx. 1/5 to 1/3 back laterally onto the escape path of the diameter of the trunk – Plan escape paths on slopes parallel to the slope – When walking away along the escape path, watch out for falling limbs and watch the top of the tree. 12 MS 231, MS 231 C, MS 251, MS 251 C
English Determine direction of fall with gunning Checking the direction of fall felling notch to a depth of about 1/10 of sight on cover and fan housing 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 information on felling cut 001BA153 KN 001BA153 KN Basic dimensions N Insert the chainsaw with guide bar in Your chainsaw has a gunning sight on the bottom of the felling notch. The the cover and fan housing. Use this gunning sight must point in the gunning sight. planned direction of fall – if necessary, correct direction of fall Making the felling notch C by re-cutting the felling notch. 1/10 When making a felling notch, align the Ø chainsaw so that the notch lies at a right Sapwood cuts 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 C E national legislation regarding felling technique. 001BA259 KN N Make a bottom (horizontal) cut G N Make the top (angled) cut approx. 45°- 60° to the bottom cut The felling notch (C) determines the direction of fall. The hinge (D) functions like a real hinge to guide the tree to the ground. – Width of hinge: approx. 1/10 of the trunk diameter 001BA150 KN – Never saw through the hinge while felling – otherwise the tree will fall in a direction other than the one Sapwood cuts in long-fibered softwood planned – risk of accident! help prevent sapwood splintering when the tree falls. Make cuts at both sides of – With rotten trunks, leave a wider the trunk at same height as bottom of hinge MS 231, MS 231 C, MS 251, MS 251 C 13
English The tree is felled with the felling cut (E). 1. Begin cut by applying the lower Select suitable felling wedges portion of the guide bar nose – do dependent on the trunk diameter and the – Cut horizontally not use upper portion because of width of the kerf (analogue to felling cut – 1/10 (at least 3 cm) of tree diameter risk of kickback. Cut at full strength (E)). higher than bottom of felling until the depth of the kerf is twice the Contact the STIHL dealer for the notch (C). width of the guide bar selection of the felling wedge (suitable The holding strap (F) or stabilizing 2. Swing the machine slowly into the length, width and height). strap (G) supports the tree and helps plunge cutting position – risk of prevent it from falling prematurely. kickback and pushback! Selecting the appropriate felling cut – Width of strip: approx. 1/10 to 1/5 of 3. Make the plunge cut very carefully. the trunk diameter Risk of pushback. The selection of the appropriate felling – Do not cut into the strip during the cut is dependent on the same tree felling cut characteristics that must be noted when determining the direction of fall and the – With rotten trunks, leave a wider escape paths. strip There are various different features of Plunge cutting these characteristics. This User Manual 001BA270 KN – For relieving cuts during shortening will only describe the two most commonly occurring variants: – For wood carving 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, 001BA260 KN i.e. the same thickness at all points. To do this, guide the plunge bar parallel to the sink chord. Felling wedges left: Normal tree – vertically upright tree with uniform Insert the felling wedge as soon as crown 1. possible, i.e. as soon as no obstruction of saw control is to be expected. Position right: Leaner tree - crown pointing in the felling wedge in the felling cut and direction of fall 3. drive in with suitable tools. 2. 001BA269 KN Only use aluminum or plastic wedges – do not use steel wedges. Steel wedges can seriously damage the saw chain and N Use a low kickback saw chain and cause dangerous kickback. proceed with special care 14 MS 231, MS 231 C, MS 251, MS 251 C
English Felling cut with stabilizing strap (normal – Do not cut into the stabilizing strap tree) A) Thin trunks 1. Implement this felling cut when the trunk 2. 3. diameter is smaller than the cutting length of the chainsaw. 3. 4. 5. 001BA263 KN 1. 2. 001BA273 KN Shout a warning before starting the felling cut. N Set the felling wedge (3) N Engage the spiked bumper at the Shout a second warning immediately height of the felling cut and use this before the tree falls. as the rotation point – reposition the 001BA261 KN N Cut through the stabilizing strap, chainsaw as little as possible horizontal level with the felling cut, N Tip of the guide bar must penetrate with arms fully extended the wood before the hinge (1) – Shout a warning before starting the B) Thick trunks guide the chainsaw absolutely felling cut. horizontally and swivel as widely as Implement this felling cut when the trunk N Plunge cut the felling cut (E) – diameter is greater than the cutting possible plunge the guide bar fully in length of the machine. N Make the felling cut up to the N Engage the spiked bumper behind hinge (2) the hinge and use this as the – Do not cut into the hinge rotation point – reposition the chainsaw as little as possible N Make the felling cut up to the stabilizing strap (3) N Make the felling cut up to the hinge (1) – Do not cut into the stabilizing strap – Do not cut into the hinge The felling cut must be continued on the opposite side of the trunk. N Make the felling cut up to the stabilizing strap (2) Ensure that the second cut is at the same level as the first cut. MS 231, MS 231 C, MS 251, MS 251 C 15
English N Plunge cut the felling cut N Make the felling cut up to the hinge (4) – Do not cut into the hinge N Make the felling cut up to the stabilizing strap (5) 1. 2. – Do not cut into the stabilizing strap 001BA266 KN 001BA265 KN 6. N Plunge cut the guide bar into the Shout a second warning immediately trunk until it exits on the other side before the tree falls. N Make the felling cut (E) towards the N With outstretched arms, cut through hinge (1) the holding strap at a downward angle from outside. – Cut horizontally 001BA274 KN – Do not cut into the hinge N Make the felling cut towards the N Set the felling wedge (6) holding strap (2) Shout a second warning immediately – Cut horizontally before the tree falls. – Do not cut into the holding strap. N Cut through the stabilizing strap, horizontal level with the felling cut, with arms fully extended Felling Cut with Holding Strap (Leaner) A) Thin trunks Implement this felling cut when the trunk diameter is smaller than the cutting length of the chainsaw. 16 MS 231, MS 231 C, MS 251, MS 251 C
English B) Thick trunks The felling cut must be continued on the N With outstretched arms, cut through opposite side of the trunk. the holding strap at a downward angle from outside. Ensure that the second cut is at the same level as the first cut. 1. N Engage the spiked bumper behind 2. 3. the hinge and use this as the rotation point – reposition the chainsaw as little as possible N Tip of the guide bar must penetrate the wood before the holding strap (4) – guide the chainsaw absolutely horizontally and swivel as widely as possible 5. 6. N Make the felling cut up to the 4. hinge (5) 001BA267 KN – Do not cut into the hinge N Make the felling cut up to the holding strap (6) Perform this felling cut when the tree – Do not cut into the holding strap. diameter is greater than the cutting length of the chainsaw. N Engage the spiked bumper behind the holding strap and use it as a pivot – avoid repositioning the chainsaw more than necessary. N The guide bar nose enters the wood (1) before it reaches the hinge – hold the chainsaw horizontally and swing it as far as possible. – Do not cut into the holding strap or hinge. N Make the felling cut up to the hinge (2) Do not cut into the hinge 001BA268 KN – N Make the felling cut up to the holding strap (3) – Do not cut into the holding strap. Shout a second warning immediately before the tree falls. MS 231, MS 231 C, MS 251, MS 251 C 17
English Chain Scabbard Cutting Attachment Mounting the Bar and Chain (side chain tensioner) A cutting attachment consists of the saw chain, guide bar and chain sprocket. Removing the chain sprocket cover The cutting attachment that comes standard is designed to exactly match the chain saw. 001BA244 KN 1 2 Your saw comes standard with a chain 533BA001 KN scabbard that matches the cutting 001BA248 KN attachment. a 3 If guide bars of different lengths are N Unscrew the nut and remove the mounted to the saw, always use a chain chain sprocket cover. scabbard of the correct length which – The pitch (t) of the saw chain (1), covers the complete guide bar. chain sprocket and the nose The length of the matching guide bars is 1 sprocket of the Rollomatic guide bar marked on the side of the chain must match. scabbard. – The drive link gauge (2) of the saw chain (1) must match the groove 2 001BA185 KN width of the guide bar (3). If non-matching components are used, the cutting attachment may be damaged N Turn the screw (1) beyond repair after a short period of counterclockwise until the tensioner operation. slide (2) butts against the left end of the housing slot. 18 MS 231, MS 231 C, MS 251, MS 251 C
English Disengage the chain brake. Mounting the Bar and Chain (quick chain tensioner) 3 1 1 Removing the chain sprocket cover 2 4 001BA187 KN 001BA186 KN N Fit the guide bar over the studs (1) – the cutting edges on the top of the 1 bar must point to the right. 3 2 2310BA013 KN N Pull the hand guard towards the front handle until there is an audible N Engage the peg of the tensioner click – the chain brake is slide in the locating hole (2) –- place disengaged. the chain over the sprocket (3) at the same time. N Swing grip (1) into position (until it Fitting the chain N Turn the tensioning screw (4) engages) clockwise until there is very little N Turn the wing nut (2) to the left until chain sag on the underside of the it hangs loosely in the chain bar – and the drive link tangs are sprocket cover (3) engaged in the bar groove. N Remove chain sprocket cover (3) N Refit the sprocket cover and screw on the nut only fingertight. Mounting the tensioning gear 143BA003 KN N Go to chapter on "Tensioning the Saw Chain" WARNING 1 Wear work gloves to protect your hands 2310BA014 KN from the sharp cutters. N Fit the chain – start at the bar nose. N Remove and reverse tensioning gear (1) MS 231, MS 231 C, MS 251, MS 251 C 19
English Releasing the chain brake N Fit the saw chain – starting at the nose of the guide bar – pay attention 2 to the position of the tensioning gear and the cutting edges N Turn tensioning gear (1) to the right as far as possible 2310BA015 KN N Turn the guide bar so that the tensioning gear faces the user 001BA186 KN N Remove screw (2) 1 N Pull hand guard towards the front 3 handle until it engages audibly – 2 chain brake is released 181BA013 KN 3 Fitting the saw chain 2310BA016 KN N Place the saw chain on the chain sprocket (2) N Position tensioning gear (1) and guide bar (3) relative to one another N Slide the guide bar over the collar screw (3); the head of the rear collar screw must protrude into the oblong hole 2 2310BA017 KN N Insert and tighten screw (2) 181BA012 KN 1 WARNING Put on protective gloves – risk of injury by the sharp cutters. 20 MS 231, MS 231 C, MS 251, MS 251 C
English N turn the adjusting wheel (4) a little until the chain sprocket cover can Tensioning the Saw Chain be slid completely against the (side chain tensioner) engine housing N Swing grip (5) into position (until it engages) N Fit wing nut and tighten lightly N Next step: see "Tensioning the Saw 142BA063 KN Chain" 1 Retensioning during cutting work: N Switch off the engine. 135BA011 KN N Loosen the nut. N Hold the bar nose up. N Use a screwdriver to turn the N Guide the drive link into the bar tensioning screw (1) clockwise until groove (see arrow) and turn the the chain fits snugly against the tensioning gear to the left as far as underside of the bar. possible N While still holding the bar nose up, N Fit chain sprocket cover, sliding the tighten down the nut firmly. guide lugs into the engine housing openings N Go to "Checking Chain Tension". A new chain has to be retensioned more often than one that has been in use for 4 some time. 5 N Check chain tension frequently – see chapter on "Operating Instructions". 2310BA018 KN When fitting the chain sprocket cover, the teeth of the adjusting wheel and the tensioning gear must mesh; if necessary, MS 231, MS 231 C, MS 251, MS 251 C 21
English Tensioning the Saw Chain Checking Chain Tension Fuel (quick chain tensioner) Your engine requires a mixture of gasoline and engine oil. 1 WARNING 2 For health reasons, avoid direct skin 142BA064 KN 001BA112 KN contact with gasoline and avoid inhaling gasoline vapor. STIHL MotoMix Retensioning during cutting work: N Shut off the engine. N Shut off the engine. N Wear work gloves to protect your STIHL recommends the use of STIHL hands. N Pull out the hinged clip and loosen MotoMix. This ready-to-use fuel mix the wingnut. N The chain must fit snugly against contains no benzol or lead, has a high the underside of the bar and it must octane rating and ensures that you N Turn the adjusting wheel (1) still be possible to pull the chain always use the right mix ratio. clockwise as far as stop. along the bar by hand when the STIHL MotoMix uses STIHL HP Ultra N Tighten down the wingnut (2) firmly chain brake is released. two-stroke engine oil for an extra long by hand. N If necessary, retension the chain. engine life. N Fold down the hinged clip. A new chain has to be retensioned more MotoMix is not available in all markets. N Go to "Checking Chain Tension" often than one that has been in use for some time. Mixing Fuel A new chain has to be retensioned more often than one that has been in use for N Check chain tension frequently – some time. see chapter on "Operating Instructions". NOTICE N Check chain tension frequently – see chapter on "Operating Unsuitable fuels or lubricants or mix Instructions". ratios other than those specified may result in serious damage to the engine. Poor quality gasoline or engine oil may damage the engine, sealing rings, hoses and the fuel tank. Gasoline Use only high-quality brand-name gasoline with a minimum octane rating of 90 – leaded or unleaded. 22 MS 231, MS 231 C, MS 251, MS 251 C
English Gasoline with an ethanol content of Storing Fuel more than 10% can cause running Fueling problems in engines with a manually adjustable carburetor and should not be Store fuel only in approved safety-type used in such engines. fuel canisters in a dry, cool and safe location protected from light and the sun. Engines equipped with M-Tronic deliver full power when run on gasoline with an Fuel mix ages – only mix sufficient fuel ethanol content of up to 25% (E25). for a few weeks work. Do not store fuel mix for longer than 30 days. Exposure to Preparing the machine Engine Oil light, the sun, low or high temperatures can quickly make the fuel mix unusable. If you mix the fuel yourself, use only STIHL two-stroke engine oil or another STIHL MotoMix may be stored for up to high-performance engine oil in 2 years without any problems. accordance with JASO FB, JASO FC, N Thoroughly shake the mixture in the JASO FD, ISO-L-EGB, ISO-L-EGC or canister before fueling your ISO-L-EGD. machine. 001BA229 KN STIHL specifies STIHL HP Ultra two- stroke engine oil or an equivalent high- WARNING performance engine oil in order to Pressure may build up in the canister – N Before fueling, clean the cap and maintain emission limits over the open it carefully. the area around it to ensure that no machine’s service life. dirt falls into the fuel tank N Clean the fuel tank and canister Mix Ratio from time to time. N Always position the machine so that STIHL 50:1 two-stroke engine oil: 50 the cap is facing upwards Dispose of remaining fuel and cleaning parts gasoline to 1 part oil fluid properly in accordance with local regulations and environmental Opening Examples requirements. Gasoline STIHL engine oil 50:1 Liters Liters (ml) 1 0.02 (20) 5 0.10 (100) 10 0.20 (200) 001BA236 KN 15 0.30 (300) 20 0.40 (400) 25 0.50 (500) N Raise grip to vertical position. N Use a canister approved for storing fuel. Pour oil into canister first, then add gasoline and mix thoroughly. MS 231, MS 231 C, MS 251, MS 251 C 23
English Closing 001BA232 KN 001BA235 KN 001BA234 KN N Turn the cap counterclockwise N Fold the grip down. (about a quarter turn). Grip must be vertical: N Fit the cap – marks on tank cap and fuel tank must line up. N Press the cap down as far as stop. 001BA241 KN 001BA234 KN Tank cap is locked. Marks on tank cap and fuel tank must line up. If the tank cap cannot be locked in the 001BA233 KN fuel tank opening Bottom of cap is twisted in relation to N While holding the cap depressed, top. turn it clockwise until it engages in position. N Remove the cap from the fuel tank 001BA237 KN and check it from above. N Remove the tank cap. Filling Up with Fuel 001BA231 KN Take care not to spill fuel while fueling and do not overfill the tank. The marks on the tank cap and fuel tank STIHL recommends you use the STIHL are then in alignment. filler nozzle for fuel (special accessory). N Fill the fuel tank. 24 MS 231, MS 231 C, MS 251, MS 251 C
English Chain Lubricant Filling Chain Oil Tank For automatic and reliable lubrication of 1 the chain and guide bar – use only an environmentally compatible quality 001BA238 KN chain and bar lubricant. Rapidly biodegradable STIHL BioPlus is Preparations recommended. Left: Bottom of cap is twisted – inner mark (1) in line with NOTICE outer mark. Biological chain oil must be resistant to Right: Bottom of cap in correct posi- aging (e.g. STIHL BioPlus), since it will tion – inner mark is under the otherwise quickly turn to resin. This grip. It is not in line with the results in hard deposits that are difficult outer mark. 001BA158 KN 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 N Thoroughly clean the oil filler cap bar depends on the quality of the and the area around it to ensure that lubricant. It is therefore essential to use no dirt falls into the tank. only a specially formulated chain 001BA239 KN N Position the machine so that the lubricant. filler cap is facing up. WARNING N Open the filler cap. N Place the cap on the opening and rotate it counterclockwise until it Do not use waste oil. Renewed contact Fill up with chain oil. engages the filler neck. with waste oil can cause skin cancer. Moreover, waste oil is environmentally N Continue rotating the cap Refill the chain oil tank every time harmful. N counterclockwise (about a quarter you refuel. turn) – this causes the bottom of the cap to be turned to the correct NOTICE Take care not to spill chain oil while position. refilling and do not overfill the tank. Waste oil does not have the necessary N Turn the cap clockwise and lock it in lubricating properties and is unsuitable STIHL recommends you use the STIHL position – see section on "Closing". for chain lubrication. filler nozzle for chain oil (special accessory). N Close the filler cap. There must still be a small amount of oil in the oil tank when the fuel tank is empty. MS 231, MS 231 C, MS 251, MS 251 C 25
English If the oil level in the tank does not go down, the reason may be a fault in the oil Checking Chain Lubrication Chain Brake 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. Locking the chain 143BA024 KN The saw chain must always throw off a small amount of oil. 143BA011 KN NOTICE Never operate your saw without chain lubrication. If the chain runs dry, the whole cutting attachment will be – in an emergency irretrievably damaged within a very short – when starting time. Always check chain lubrication and the oil level in the tank before starting – at idling speed work. The chain brake is activated by pushing Every new chain has to be broken in for the hand guard toward the bar nose with about 2 to 3 minutes. your left hand – or by inertia in certain kickback situations: The chain is After breaking in the chain, check chain stopped and locked. tension and adjust if necessary – see "Checking Chain Tension". 26 MS 231, MS 231 C, MS 251, MS 251 C
English Releasing the chain brake The chain brake will operate only if the hand guard has not been modified in any Winter Operation way. Check operation of the chain brake Before starting work: Run engine at idle speed, engage the chain brake (push Pre-heating carburetor hand guard toward bar nose) and open the throttle wide for no more than 3 seconds – the chain must not rotate. N Remove the shroud – see "Shroud" The hand guard must be free from dirt At temperatures below +10 °C and move freely. Chain brake maintenance The chain brake is subject to normal 143BA012 KN wear. It is necessary to have it serviced 2310BA000 KN and maintained regularly by trained personnel. STIHL recommends that you have servicing and repair work carried N Pull the hand guard back toward the out exclusively by an authorized STIHL front handle, servicing dealer. Maintain the following N Using a screwdriver, pry the shutter servicing intervals: out of the s (summer operation) position NOTICE Full-time usage: every 3 Always disengage chain brake before months accelerating the engine (except when Part-time usage: every 6 checking its operation) and before months starting cutting work. Occasional usage: every 12 High revs with the chain brake engaged months 2310BA001 KN (chain locked) will quickly damage the powerhead and chain drive (clutch, chain brake). The chain brake is also activated by the N Place the shutter with the opening in inertia of the front hand guard if the the direction of the chain saw in kickback force of the saw is high the r position (winter operation) – enough: The hand guard is accelerated shutter must audibly snap into place toward the bar nose – even if your left N Fit the shroud – see "Shroud" hand is not behind the hand guard, e.g. during felling cut. MS 231, MS 231 C, MS 251, MS 251 C 27
English Heated air is now drawn in from around Setting the Master Control Lever the cylinder and circulates around the Starting / Stopping the carburetor – this helps prevent Engine carburetor icing. To move the Master Control lever from the normal run position (F) to choke Positions of Master Control Lever At temperatures above +20 °C closed (l), press down the throttle trigger lockout and squeeze the throttle N Ensure that the shutter is always trigger at the same time and hold them in returned to position s (summer that position – now set the Master operation), otherwise the engine Control lever. may malfunction due to overheating STOP To select the starting throttle position (n), move the Master Control At temperatures below -10 °C lever to choke closed (l) first, then push it into the starting throttle N if the chain saw is extremely cold 0 position (n). (frost formation) – after starting, The Master Control lever must be in the bring the engine up to operating choke closed position (l) for the temperature at increased idle speed changeover to the starting throttle (disengage chain brake!) position (n). In case of erratic idling behavior or poor The Master Control lever moves from acceleration the starting throttle position (n) to the N Turn the low speed screw (L) run position (F) when you press down 001BA140 KN 1/4 turn counterclockwise the throttle trigger lockout and blip the throttle trigger at the same time. Whenever the low speed screw (L) has been adjusted, it is usually also To switch off the engine, move the necessary to adjust the idle speed Stop 0 – engine off – the ignition is Master Control lever to Stop (0). adjusting screw (LA), see "Setting the switched off carburetor". Normal run position F – engine runs or Choke shutter closed (l) can fire. – if the engine is cold Air filter system Starting throttlen – this position is used – if the engine stalls when you open to start a warm engine. The Master the throttle after starting. N Retrofit new air filter if necessary – Control lever moves to the normal run position as soon as the throttle trigger is – if the fuel tank was run until empty see "Air filter system" squeezed. (engine stopped). Choke shutter closed l – this position Starting throttle position (n) is used to start a cold engine. – if the engine is warm, i.e. if it has been running for about one minute. – When the engine begins to fire – after clearing a flooded combustion chamber. 28 MS 231, MS 231 C, MS 251, MS 251 C
English Fuel pump On the ground Between knees or thighs Press the manual fuel pump bulb several times – even if the bulb is already filled with fuel: – When starting for the first time. – if the fuel tank was run until empty (engine stopped). Holding the Saw There are two ways of holding the saw when starting. 2310BA008 KN 2310BA009 KN N Place your saw on the ground. N Hold the rear handle tightly between Make sure you have a firm footing – your legs, just above the knees. check that the chain is not touching N Hold the front handle firmly with any object or the ground. your left hand – your thumb should N Hold the saw firmly on the ground be under the handle. with your left hand on the front handle – your thumb should be under the handle. N Put your right foot into the rear handle and press down. MS 231, MS 231 C, MS 251, MS 251 C 29
English Cranking Versions with ErgoStart Starting the Saw WARNING Standard versions This machine is extremely simple and WARNING easy to start, even for children – risk of Bystanders must be well clear of the accidents. general work area of the saw. Do not allow children or other N Observe safety precautions. unauthorized persons to attempt to start or otherwise use the machine: Versions with manual fuel pump – Never leave the machine unattended during work breaks. – After work, store the machine in a safe, secure location. The ErgoStart stores the energy 2310BA021 KN 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. Press the manual fuel pump bulb at 231BA010 KN N There are two ways of starting with the least five times – even if the bulb is ErgoStart: already filled with fuel. N Pull the starter grip slowly with your N Hold the starter grip with your right right hand until you feel it engage – hand and pull it out slowly and and then give it a brisk strong pull steadily – or – hold the starter grip and push down the front handle at with your right hand and give it the same time. Do not pull out the several short pulls, using only a starter rope to full length – it might short length of rope for each pull. otherwise break. Do not let the N Push down the handle while starter grip snap back. Guide it cranking. Do not pull out the rope to slowly back into the housing so that its full length – it might otherwise the starter rope can rewind properly. break. Machines without additional manual fuel N Do not let the starter grip snap back. pump: If the engine is new or after a long Guide it slowly back into the housing out-of-service period, it may be so that the starter rope can rewind necessary to pull the starter rope several properly. times to prime the fuel system. 30 MS 231, MS 231 C, MS 251, MS 251 C
English All models When engine begins to fire STOP 001BA186 KN 4 0 0 2310BA003 KN 1 N Pull the hand guard back towards the front handle. N Set the Master Control lever (4) to The chain brake is now disengaged – the starting throttle position (n). your saw is ready for operation. 4 2 N Hold and start your saw as described. NOTICE Always disengage chain brake before 2310BA002 KN 3 As soon as the engine runs accelerating the engine. High revs with the chain brake engaged (chain locked) will quickly damage the clutch and chain N Push the hand guard (1) forward – STOP brake. the chain is locked. At very low outside temperatures N Press down the trigger lockout (2) 4 0 and pull the throttle trigger (3) at the same time. Set Master Control 2310BA004 KN N Allow engine to warm up at part lever (4) to: 3 throttle. Choke shutter closed (l) N Change over to winter operation if – if the engine is cold (also use this necessary – see “Winter Operation”. N Press down trigger lockout and the position if the engine stopped when blip the throttle trigger (3) – the you opened the throttle after Master Control lever (4) moves to Stopping the engine starting) the run position (F) and the engine Starting throttle position (n) settles down to idling speed. N Move the Master Control lever to the stop position (0). – if the engine is warm, i.e. if it has been running for about one minute. NOTICE If the engine does not start N Hold and start your saw as As the chain brake is still engaged, the described. engine must be returned to idling speed immediately – or the engine housing and If you did not move the Master Control chain brake might otherwise be lever from the choke closed damaged. position (l) to the starting throttle MS 231, MS 231 C, MS 251, MS 251 C 31
You can also read