STIHL MS 151 C 2 - 38 Instruction Manual
English 24 25 26 27 28 29 30 31 32 Dear Customer, Thank you for choosing a quality engineered STIHL product. It has been built using modern production techni‐ ques and comprehensive quality assurance. Every effort has been made to ensure your satis‐ faction and trouble-free use of the product. Dr. Nikolas Stihl 1 Guide to Using this Manual This Instruction Manual refers to a STIHL chain saw, also called a machine in this Instruction Manual. 1.
2 Safety Precautions 1.2 Symbols in text WARNING 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. 1.3 Engineering improvements 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.
English 2 Safety Precautions Wear suitable safety shoes – with cutretardant material, non-slip soles and steel toe caps. 2.6 WARNING To reduce the risk of eye injuries, wear tight-fitting safety goggles con‐ forming to standard EN 166 or a face shield. Make sure that the safety gog‐ gles and the face shield fit correctly. Wear "personal" hearing protection – for exam‐ ple, ear defenders. Wear a hard hat wherever there is any risk of falling objects.
2 Safety Precautions Before Starting Work To reduce the risk of personal injury, do not operate your saw if it is damaged or not properly assembled. 2.9 Starting the chain saw 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.
English 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 inter‐ vals and as soon as you note any tangible changes: – Switch off the engine; wait until the saw chain is stationary – Check condition and secure fitting – Check sharpness Never touch the saw chain when the engine is running.
3 Reactive Forces 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.
English 4 Working Techniques object, e.g. when another limb is touched acci‐ dentally during limbing. – when the chain at the nose of the guide bar is pinched in the cut. 3.3 Quickstop chain brake: the chain pulls the saw forward – to reduce this risk, always engage the spiked bumper securely in the tree or limb. 3.6 Pushback (B) 3.4 To reduce the risk of kickback – Work cautiously and avoid situations which could cause kickback. – Hold the saw firmly with both hands and main‐ tain a secure grip.
English 4 Working Techniques 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. Country-specific legislation on felling technique must be complied with during felling work. 4.1 Sawing Do not operate your saw with the starting throttle lock engaged. Engine speed cannot be control‐ led with the throttle trigger in this position.
English 4 Working Techniques erwise the cutting attachment may stick in the cut or kick back – risk of injury! Preparing for felling Make sure no-one is endangered by the falling tree – the noise of your engine may drown any warning calls. 1 ► Make relieving cut at the compression side (1) ► Make bucking cut at the tension side (2) Be wary of pushback when making bucking cut from the bottom upwards (underbuck).
4 Working Techniques English 001BA146 KN Preparing work area at base of tree – First clear the tree base and work area from interfering limbs and brush to provide a secure footing. – Carefully clear the base of the trunk (e.g.
English 4 Working Techniques The felling notch (C) determines the direction of fall. Checking the direction of fall 001BA243 KN The bottom cut and top cut must meet in a con‐ tinuous straight sink chord. ► Position the meter stick at the pivot point of the sink chord – the tip of the meter stick must point in the direction of the specified direction of fall – where necessary, correct the direction of fall by cutting the felling notch accordingly 4.
English 001BA270 KN 001BA260 KN 4 Working Techniques Where possible, use a plunge blade. The plunge blade and the upper/lower side of the guide bar are parallel. left: right: Normal tree – vertically upright tree with uniform crown Leaner tree - crown pointing in direc‐ tion of fall 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. 4.
English 4 Working Techniques ► Make the felling cut up to the stabilizing strap (5) – Do not cut into the stabilizing strap 3. 001BA274 KN 001BA273 KN 6. ► Set the felling wedge (3) Shout a second warning immediately before the tree falls. ► Cut through the stabilizing strap, horizontal level with the felling cut, with arms fully exten‐ ded B) Thick trunks Implement this felling cut when the trunk diame‐ ter is greater than the cutting length of the machine.
5 Cutting Attachment English Shout a second warning immediately before the tree falls. ► With outstretched arms, cut through the hold‐ ing strap at a downward angle from outside. B) Thick trunks 001BA268 KN 001BA266 KN – Do not cut into the holding strap. Shout a second warning immediately before the tree falls. ► With outstretched arms, cut through the hold‐ ing strap at a downward angle from outside.
English Chain Scabbard ► Unscrew the nut (1) and remove the chain sprocket cover (2) 6.3 Mounting the Guide Bar 001BA244 KN 1 2 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 cor‐ rect length which covers the complete guide bar. 2011BA003 KN 5.
7 Tensioning the Saw Chain (side chain tensioner) English ► Go to "Checking Chain Tension". 2 2011BA006 KN A new chain has to be retensioned more often than one that has been in use for some time. ► Check chain tension frequently – see chapter on "Operating Instructions".
English 9.2 10 Fueling Mixing Fuel NOTICE Unsuitable fuels or lubricants or mix ratios other than those specified may result in serious dam‐ age to the engine. Poor quality gasoline or engine oil may damage the engine, sealing rings, hoses and the fuel tank. 9.2.1 STIHL MotoMix may be stored for up to 2 years without any problems. ► Thoroughly shake the mixture in the canister before fueling your machine.
10 Fueling 10.2 English 10.3 Opening Filling Up with Fuel Take care not to spill fuel while fueling and do not overfill the tank. 001BA236 KN STIHL recommends you use the STIHL filler noz‐ zle for fuel (special accessory). ► Fill the fuel tank. 10.4 Closing 001BA232 KN 001BA234 KN ► Raise grip to vertical position. Grip must be vertical: ► Fit the cap – marks on tank cap and fuel tank must line up. ► Press the cap down as far as stop.
11 Chain Lubricant 001BA235 KN 001BA239 KN English ► Place the cap on the opening and rotate it counterclockwise until it engages the filler neck. ► Continue rotating the cap counterclockwise (about a quarter turn) – this causes the bottom of the cap to be turned to the correct position. ► Turn the cap clockwise and lock it in position – see section on "Closing". 001BA241 KN ► Fold the grip down. Tank cap is locked. 10.
12 Filling Chain Oil Tank English 13 WARNING Do not use waste oil. Renewed contact with waste oil can cause skin cancer. Moreover, waste oil is environmentally harmful. Checking Chain Lubrica‐ tion NOTICE 12 The saw chain must always spin off a small amount of oil. NOTICE Preparations Never operate your machine without chain lubri‐ cation. If the saw chain runs dry, the cutting attachment may very quickly be damaged beyond repair.
English 14.2 15 Starting / Stopping the Engine 15 Disengaging the chain brake Positions of the Master Control lever 2011BA012 KN 15.1 Starting / Stopping the Engine 2011BA042 KN ► Pull the hand guard back towards the front handle. NOTICE The chain brake must be released before open‐ ing the throttle (except during functional check‐ out) and before sawing.
15 Starting / Stopping the Engine English The Master Control lever moves from the starting throttle position n to the run position F when you press down the throttle trigger lockout and blip the throttle trigger at the same time. To switch off the engine, set the master control lever to Stop 0. Manual fuel pump The manual fuel pump bulb must be pressed: – When starting for the first time – If the fuel tank was run until empty (engine stopped).
English 15 Starting / Stopping the Engine 15.9 Position choke shutter closed l As Soon As the Engine Runs 2 2011BA019 KN – if engine is cold (even if the engine has stalled during opening of throttle after starting) ► Press down the trigger lockout and blip the throttle trigger (2) – the Master Control lever (1) moves to the run position F and the engine settles down to idling speed. – if engine is warm (once the engine has been running for approx.
16 Operating Instructions English 16.2 15.11 Shut off the engine During work NOTICE Do not make the mixture leaner to achieve an apparent increase in power – this could damage the engine – see "Adjusting the Carburetor". 2011BA023 KN 1 ► Move Master Control lever (1) to Stop 0. 15.12 If Engine Does Not Start If you did not move the Master Control lever from the choke closed position l to the choke open position j quickly enough after the engine began to fire, the engine is probably flooded.
English 17 Taking Care of the Guide Bar 18 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. 16.3.1 18.1 Cleaning the Air Filter If there is a noticeable loss of engine power Short-term storage 16.3.2 2011BA024 KN 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.
20 Spark Plug 19.3 English Standard Setting Erratic idling behavior, poor acceleration (even though standard setting of low speed screw is correct) 2011BA048 KN Idle setting is too lean ► Turn the low speed screw (L) carefully coun‐ terclockwise, no further than stop, until the engine runs smoothly and accelerates well. ► Turn high speed screw (H) counterclockwise as far as stop (no more than 3/4 turn). ► Turn the low speed screw (L) clockwise as far as stop, then turn it back 1/4 turn. 19.
English 21 Storing the Machine 2 1 000BA045 KN 2011BA002 KN 1 ► Unscrew the nut (1) and remove the sprocket cover (2). WARNING 2011BA029 KN 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 inju‐ ries or damage to property. ► Pull off the spark plug boot. ► Unscrew the spark plug. A ► Clean dirty spark plug.
23 Maintaining and Sharpening the Saw Chain Replace the chain sprocket WARNING 2011BA045 KN 22.1 English Compliance with the angles and dimensions lis‐ ted 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! 23.2 Chain pitch – replace after using two saw chains or sooner – if the wear marks (arrows) on the sprocket are deeper than approx. 0.
English 23 Maintaining and Sharpening the Saw Chain exceptions. Ripping chains have an X in the des‐ ignation. B Side plate angle The correct side plate angle results automatically when the specified file holder and file diameter are used. Tooth shapes Micro = semi-chisel tooth, e. g., 63 PM3, 26 RM3, 36 RM Super = full chisel tooth, e. g., 63 PS3, 26 RS, 36 RS3 Ripping chain, e. g., 63 PMX, 36 RMX Angle (°) A B 30 75 30 60 10 75 The angles must be identical for all cutters in the saw chain.
23 Maintaining and Sharpening the Saw Chain English ► Lay the appropriate file gauge (1) for the chain pitch on the saw chain and press it against the cutter to be checked – if the depth gauge pro‐ trudes past the file gauge, the depth gauge must be reworked With varying cutter lengths, the cutter heights also vary and cause rough running of the saw chain and chain breakage.
English 23 Maintaining and Sharpening the Saw Chain WARNING 689BA052 KN Depth gauges that are too low increase the kick‐ back tendency of the chain saw.
24 Maintenance and Care Complete machine Visual inspection (condition, leaks) Clean Throttle trigger, throttle trigger Function test lockout, choke lever, stop switch, master control lever (dependent on equipment) Chain brake Function test Have checked by dealer1) Manual fuel pump (if present) check Have repaired by a specialist dealer1) Fuel pick-up body / filter in fuel check tank Clean, replace filter insert replace Fuel tank Clean Lubricating oil tank Clean Chain lubrication check Saw chain Check, pay
Carburetor Spark plug Accessible screws and nuts (except adjusting screws) Chain catcher Safety information label 25 Check idle adjustment – saw X chain must not rotate Set the idle speed; if required have the chainsaw repaired by a specialist dealer1) Adjust electrode gap Replace after 100 hours of operation X X X X Tighten2) check replace replace Minimize Wear and Avoid Damage Observing the instructions in this manual helps reduce the risk of unnecessary wear and dam‐ age to the power tool.
26 Main Parts 25.2 English Parts Subject to Wear and Tear 11 Spiked bumper 1) Some parts of the power tool are subject to nor‐ mal 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.
English 27.6 28 Special Accessories 27.9 Cutting Attachment Exhaust Emissions Actual cutting length may be less than the speci‐ fied length The CO2value measured in the EU type approval procedure is specified at www.stihl.com/co2. 27.6.1 The measured CO2value 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.
30 Maintenance and Repairs English Model Contact your STIHL servicing dealer for the lat‐ est information on waste disposal. Serial number 32 Guide bar part number ANDREAS STIHL AG & Co. KG Badstr. 115 D-71336 Waiblingen Chain part number 30 Germany Maintenance and Repairs declare under our sole responsibility that 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.
English 32 EC Declaration of Conformity pp Dr.
32 EC Declaration of Conformity 0458-506-0121-B English 39
0458-506-0121-B *04585060121B* www.stihl.
