Stihl MS 780 Instruction Manual
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Stihl MS 780 Instruction Manual

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MS 780
2 - 41
Instruction Manual

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Summary of Contents for Stihl MS 780

  • Page 1 MS 780 2 - 41 Instruction Manual...

  • Page 2: Table Of Contents

    Cutting Attachment........15 Mounting the Bar and Chain..... 16 Guide to Using this Manual Tensioning the Chain........ 16 Checking Chain Tension......17 This Instruction Manual refers to a STIHL chain Fuel............17 saw, also called a machine in this Instruction Fueling............18 Manual.

  • Page 3: Safety Precautions

    Engineering improvements the work in poor weather conditions (rain, snow, ice, wind). STIHL's philosophy is to continually improve all of its products. For this reason we may modify Persons with pacemakers only: The ignition sys‐ the design, engineering and appearance of our tem of your chain saw produces an electromag‐...
  • Page 4 (e.g. leather). match your model and meet your performance requirements. Refuelling STIHL can supply a comprehensive range of per‐ Gasoline is an extremely flammable sonal protective equipment. fuel – keep clear of naked flames and fire – do not spill any fuel – no smok‐...
  • Page 5 2 Safety Precautions English cap, hose connections and the manual fuel pump (on machines so equipped). If there are any leaks or damage, do not start the engine – risk of fire. Have your saw repaired by a serv‐ icing dealer before using it again. –...
  • Page 6 (e.g. tingling correct when possible. Have the machine sensation in fingers), seek medical advice. repaired by a STIHL servicing dealer if the saw chain still continues to move during idling. 2.14 Maintenance and repairs...

  • Page 7: Reactive Forces

    – 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 "Speci‐ fications". Check ignition lead (insulation in good condition, secure connection).

  • Page 8: Working Techniques

    English 4 Working Techniques object, e.g. when another limb is touched acci‐ the chain pulls the saw forward – to reduce this dentally during limbing. risk, always engage the spiked bumper securely – when the chain at the nose of the guide bar is in the tree or limb.
  • Page 9 4 Working Techniques English Country-specific legislation on felling technique chain saw in the vicinity of easily combustible must be complied with during felling work. materials, dry plants or scrub. It is mandatory that you ask the responsible forestry office about Sawing the current fire hazard.
  • Page 10 English 4 Working Techniques Preparing for felling erwise the cutting attachment may stick in the cut or kick back – risk of injury! Check that there are no other persons in the fell‐ ing area – other than helpers. Make sure no-one is endangered by the falling tree –...
  • Page 11 4 Working Techniques English – Clear escape paths, eliminate obstacles Determine direction of fall with gunning sight on – Put down tools and equipment at a safe dis‐ cover and fan housing tance – but not on the escape paths –...
  • Page 12 English 4 Working Techniques Sapwood cuts – With rotten trunks, leave a wider strip Plunge cutting – For relieving cuts during shortening – For wood carving Sapwood cuts in long-fibered softwood help pre‐ vent sapwood splintering when the tree falls. Make cuts at both sides of the trunk at same ►...
  • Page 13 – reposition logue to felling cut (E)). the chainsaw as little as possible Contact the STIHL dealer for the selection of the ► Make the felling cut up to the hinge (1) felling wedge (suitable length, width and height).
  • Page 14 English 4 Working Techniques ► Make the felling cut up to the stabilizing ► Make the felling cut towards the holding strap strap (3) – Do not cut into the stabilizing strap – Cut horizontally – Do not cut into the holding strap. The felling cut must be continued on the oppo‐...

  • Page 15: Cutting Attachment

    5 Cutting Attachment English Chain Scabbard ► Tip of the guide bar must penetrate the wood before the holding strap (4) – guide the chain‐ saw absolutely horizontally and swivel as widely as possible ► Make the felling cut up to the hinge (5) –...

  • Page 16: Mounting The Bar And Chain

    English 6 Mounting the Bar and Chain Mounting the Bar and Fitting the chain Chain Removing the chain sprocket cover WARNING Wear work gloves to protect your hands from the sharp cutters. ► Unscrew the nuts and take off the chain ►...

  • Page 17: Checking Chain Tension

    27% (E27). 9.2.2 Engine oil If you mix the fuel yourself, use only STIHL two- ► Shut off the engine. stroke engine oil or another high-performance ► Wear work gloves to protect your hands.

  • Page 18: Fueling

    STIHL MotoMix however can be stored for up to 5 years without any problems. ► Shake the canister containing the fuel mixture left:...
  • Page 19 Checking the lock 10.3.2 Filling with fuel Take care not to spill fuel while fueling and do not overfill the tank. STIHL recommends using the STIHL filling sys‐ tem for fuel (special accessory). ► Fill with fuel 10.3.3 Closing – The lug on the bracket must engage entirely in...
  • Page 20 ► Remove the filler cap 10.4.2 Filling with fuel Take care not to spill fuel while fueling and do not overfill the tank. STIHL recommends using the STIHL filling sys‐ tem for fuel (special accessory). ► Fill with fuel ► Open bracket 0458-550-0121-B...
  • Page 21 10 Fueling English 10.4.3 Closing Filler cap is locked Bracket is in an upright position: 10.4.4 If the filler cap will not lock onto the ► Position filler cap – markings on filler cap and fuel tank fuel tank must align ►...

  • Page 22: Chain Lubricant

    Take care not to spill chain oil while refilling and NOTICE do not overfill the tank. STIHL recommends you use the STIHL filler noz‐ Biological chain oil must be resistant to aging zle for chain oil (special accessory). (e.g. STIHL BioPlus), since it will otherwise ►...

  • Page 23: Chain Brake

    Press the hand guard towards the nose of the ried out only by authorised STIHL dealers. The guide bar with the left hand - or automatically following intervals must be complied with:...
  • Page 24 English 15 Winter Operation NOTICE Above 20 °C, always return the slide to the posi‐ tion for "summer operation" again! Risk of engine malfunction – overheating! 15.2 Air filter system ► Retrofit new air filter if necessary – see "Air fil‐ ter system"...

  • Page 25: Starting / Stopping The Engine

    16 Starting / Stopping the Engine English 16 Starting / Stopping the 16.2.2 Starting throttle position (n) – if the engine is warm, i.e. if it has been running Engine for about one minute. – When the engine begins to fire 16.1 Positions of Master Control –...
  • Page 26 English 16 Starting / Stopping the Engine 16.3.2 Between knees or thighs ► Pull the starter grip slowly with your right hand until you feel it engage – and then give it a brisk strong pull and push down the front han‐ dle at the same time.
  • Page 27 16 Starting / Stopping the Engine English 16.7 As soon as the engine runs STOP STOP ► Blip the throttle trigger (2), the Master Control lever (1) moves to the run position (F) and the engine settles down to idling speed. ►...

  • Page 28: Operating Instructions

    English 17 Operating Instructions ► Move the Master Control lever to the stop underside of the bar – the chain may otherwise position (0). jump off the bar. Retension the chain – see "Ten‐ ► Remove the spark plug – see "Spark Plug". sioning the Saw Chain".

  • Page 29: Taking Care Of The Guide Bar

    ► Regularly clean the oil inlet hole (1), the oil‐ When dry, STIHL filters attain a long service life. way (2) and the bar groove (3) ► Always use STIHL filters dry ► Measure the groove depth – with the scale on the filing gauge (special accessory) –...

  • Page 30: Cleaning The Air Filter

    ► Carry out the standard setting. If there is a noticeable loss of engine power: ► Start and warm up the engine. ► Wash the filter in STIHL special-purpose cleaner (special accessory) or a clean, non- flammable cleaning liquid (e.g., warm soapy water) –...

  • Page 31: Spark Plug

    ► Check electrode gap (A) and readjust if neces‐ eroded. Install only suppressed spark plugs of sary – see "Specifications". the type approved by STIHL – see "Specifica‐ ► Rectify the problems which have caused foul‐ tions". ing of the spark plug.

  • Page 32: Storing The Machine

    ► Thoroughly clean the machine - pay special attention to the cylinder fins and air filter ► When using biological chain oil (e.g. STIHL BioPlus), fill the lubricant oil tank ► Store the machine in a dry and secure location...

  • Page 33: Maintaining And Sharpening The Saw Chain

    Carbide-tipped (Duro) saw chains are especially wear-resistant. For an optimal sharpening result, STIHL recommends STIHL servicing dealers. A Sharpening angle STIHL saw chains are sharpened with a 30° sharpening angle. Ripping chains, which are sharpened with a 10° sharpening angle, are 0458-550-0121-B...
  • Page 34 ► To remove file burr, use a piece of hardwood ► Check angle with file gauge STIHL filing gauge (special accessory, see table All cutters must be equally long. "Sharpening tools") – a universal tool for check‐...
  • Page 35 27 Maintaining and Sharpening the Saw Chain English ► Lay the appropriate file gauge (1) for the chain With varying cutter lengths, the cutter heights pitch on the saw chain and press it against the also vary and cause rough running of the saw cutter to be checked –...
  • Page 36 English 27 Maintaining and Sharpening the Saw Chain WARNING Depth gauges that are too low increase the kick‐ back tendency of the chain saw. ► Lay the file gauge on the saw chain – the high‐ est point of the depth gauge must be flush with the file gauge ►...

  • Page 37: Maintenance And Care

    Have replaced by servicing dealer 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...

  • Page 38: Minimize Wear And Avoid Damage

    The user is responsible for all damage caused by by a servicing dealer. non-observance of the safety precautions, oper‐ STIHL recommends that you have servicing and ating and maintenance instructions in this man‐ repair work carried out exclusively by an author‐...

  • Page 39: Main Parts

    – Components of antivibration system 23 Rear hand guard (depending on model) 30 Main Parts # Serial number 31 Specifications 31.1 Engine STIHL single cylinder two-stroke engine Displacement: 121.6 cm Cylinder bore: 60 mm Piston stroke: 43 mm Engine power according to 5.6 kW (7.8 HP) at...

  • Page 40: Ordering Spare Parts

    When repairing the machine, only use replace‐ Pitch: .404" (10.26 mm) Drive link gauge: 1.6 mm ment parts which have been approved by STIHL for this power tool or are technically identical. 31.6.4 Chain sprockets Only use high-quality replacement parts in order 7-tooth for .404"...

  • Page 41: Stihl Product

    34 Disposal English STIHL products must not be thrown in the gar‐ bage can. Take the product, accessories and packaging to an approved disposal site for envi‐ ronment-friendly recycling. Contact your STIHL servicing dealer for the lat‐ est information on waste disposal.
  • Page 42 English 34 Disposal 0458-550-0121-B...
  • Page 43 34 Disposal English 0458-550-0121-B...
  • Page 44 *04585500121B* 0458-550-0121-B...

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