Stihl MS 231 Instruction Manual
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Stihl MS 231 Instruction Manual

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STIHL MS 231, 251
Instruction Manual

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  • Page 1 STIHL MS 231, 251 Instruction Manual...

  • Page 3: Table Of Contents

    Storing the Machine Checking and Replacing the Chain Sprocket 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...

  • Page 4: Guide To Using This Manual

    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 MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 5: Safety Precautions

    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...
  • Page 6 Clean plastic parts with a cloth. Harsh engine is still hot – the fuel may spill over pump (on machines so equipped). If detergents can damage the plastic. – risk of fire! MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 7 – danger of immediately by moving the Master injury due to the rotating saw chain. Control lever / stop switch to STOP, 0 or †. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 8 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 MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 9 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...

  • Page 10: Reactive Forces

    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 – MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 11: Working Techniques

    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...
  • Page 12 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. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 13 Make sure no-one is endangered by the deadwood (brittle, rotten or dead falling tree – the noise of your engine wood) may drown any warning calls. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 14 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. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 15 With rotten trunks, leave a wider the tree falls. Make cuts at both sides of – hinge the trunk at same height as bottom of MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 16 Only use aluminum or plastic wedges – do not use steel wedges. Steel wedges can seriously damage the saw chain and cause dangerous kickback. Use a low kickback saw chain and proceed with special care MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 17 – opposite side of the trunk. Make the felling cut up to the Ensure that the second cut is at the stabilizing strap (2) same level as the first cut. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 18 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. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 19 Do not cut into the hinge – 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...

  • Page 20: Cutting Attachment

    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. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 21: Chain Tensioner)

    Go to chapter on "Tensioning the Saw Chain" WARNING Wear work gloves to protect your hands from the sharp cutters. Fit the chain – start at the bar nose. Remove and reverse tensioning gear (1) MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 22 (3); the head of the rear collar screw must protrude into the oblong hole Insert and tighten screw (2) WARNING Put on protective gloves – risk of injury by the sharp cutters. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 23: Tensioning The Saw Chain (Side Chain Tensioner)

    Check chain tension frequently – see chapter on "Operating Instructions". 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...

  • Page 24: Tensioning The Saw Chain (Quick Chain Tensioner)

    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. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 25: Fueling

    (200) 0.30 (300) 0.40 (400) 0.50 (500) Raise grip to vertical position. 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...
  • Page 26 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). Fill the fuel tank. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 27: Chain Lubricant

    – see section on "Closing". accessory). 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...

  • Page 28: Checking Chain Lubrication

    – 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". MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 29: Winter Operation

    – even if your left 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...

  • Page 30: Starting / Stopping The Engine

    – been running for about one minute. When the engine begins to fire – after clearing a flooded combustion – chamber. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 31 – your thumb should be under the handle. Put your right foot into the rear handle and press down. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 32 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. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 33 If you did not move the Master Control immediately – or the engine housing and lever from the choke closed chain brake might otherwise be position (l) to the starting throttle damaged. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 34: Operating Instructions

    Check chain tension frequently temperature during work. A new saw chain must be retensioned more frequently than one that has been in use already for an extended period. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 35: Taking Care Of The Guide Bar

    (special accessory) – in the area with the greatest wear Chain type Chain pitch Minimum groove depth Picco 1/4“ P 4.0 mm Rapid 1/4“ 4.0 mm MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 36: Shroud

    Refit the shroud and tighten the screws HD2 filter (black filter frame, pleated – filter material) for extreme wintry conditions (e.g. powder or drifting snow) or very dusty work areas. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 37: Cleaning The Air Filter

    – do not use a pressure Always replace a damaged filter. washer. Dry the filter components – do not expose to high temperatures. Do not impregnate the filter with oil. Reinstall the air filter. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 38: Adjusting The Carburetor

    Carefully turn the low speed adjusting screw (L) Setting the idle speed counterclockwise until the engine runs smoothly and accelerates Make standard setting properly. Start engine and let it warm up MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 39: Spark Plug

    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. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 40: Storing The Machine

    Install spur chain sprocket / rim sprocket Clean crankshaft stub and needle cage and lubricate with STIHL lubricant (special accessory) Slide needle cage onto the crankshaft stub MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 41: Maintaining And Sharpening The Saw Chain

    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! MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 42 – according to the MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 43 The depth gauge determines the depth to which the cutter penetrates the wood and thus the chip thickness. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 44 (10.26) 5.5 (7/32) 5605 772 5506 5605 750 4330 1106 893 4000 0814 252 3356 5605 007 1030 consisting of file holder with round file, taper square file and file gauge MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 45: Maintenance And Care

    Check, pay attention to sharpness Saw chain Checking the chain tension sharpen Check (wear, damage) Clean and turn over Guide bar Deburr replace Chain sprocket check Clean Air filter replace MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 46 STIHL recommends STIHL servicing dealer 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 MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 47: Minimize Wear And Avoid Damage

    Starter mechanism – STIHL recommends that you have Spark plug – servicing and repair work carried out Components of antivibration system – exclusively by an authorized STIHL MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 48: Main Parts

    20 Starter grip 21 Fuel filler cap 22 Master Control lever 23 Throttle trigger 24 Throttle trigger lockout 25 Rear handle 26 Rear hand guard Serial number Depending on model MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 49: Specifications

    MS 231: 103 dB(A) Fuel System Nose sprocket: 9-tooth MS 231 C: 103 dB(A) MS 251: 103 dB(A) All position diaphragm carburetor with integral fuel pump MS 251 C: 103 dB(A) MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 50: Ordering Spare Parts

    Chemical substances. For information on compliance with the REACH regulation (EC) No. 1907/2006 see www.stihl.com/reach. Exhaust Emissions The CO value measured in the EU type approval procedure is specified at www.stihl.com/co2. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 51: Maintenance And Repairs

    Directive 2000/14/EC, Annex V, using the ISO 9207 standard. Measured sound power level all versions of MS 231: 114 dB(A) all versions of MS 251: 114 dB(A) MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 52 The year of manufacture and serial number are applied to the product. Done at Waiblingen, 03.02.2020 ANDREAS STIHL AG & Co. KG p p. Dr. Jürgen Hoffmann Head of Product Data, Regulations and Licensing MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 53 English MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 54 English MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 56 0458-737-0121-B englisch www.stihl.com *04587370121B* 0458-737-0121-B...

This manual is also suitable for:

Ms 251

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