Stihl FS 91 Instruction Manual
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Stihl FS 91 Instruction Manual

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STIHL FS 91, 91 R
2 - 39
Instruction Manual

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Summary of Contents for Stihl FS 91

  • Page 1 STIHL FS 91, 91 R 2 - 39 Instruction Manual...

  • Page 2: Table Of Contents

    NOTICE Caution where there is a risk of damaging the machine or its individual components. Engineering improvements STIHL's philosophy is to continually improve all of its products. For this reason we may modify 0458-426-0121-B...

  • Page 3: Safety Precautions And Working Techniques

    Observe all applicable local safety regulations, that are explicitly approved for this power tool e.g. by trade organizations, social insurance model by STIHL or are technically identical. If institutions, labor safety authorities etc. you have any questions in this respect, consult your dealer.
  • Page 4 Open the fuel cap carefully to allow any pressure build-up in the tank to release slowly and avoid fuel spillage. STIHL can supply a comprehensive range of per‐ Only refuel the machine in a well ventilated sonal protective equipment. place. If fuel has been spilled, immediately clean the machine –...
  • Page 5 2 Safety Precautions and Working Techniques English – Use only an approved combination of cutting Avoid contact with the cutting attach‐ ment – risk of injury! attachment, deflector, handle and harness. All parts must be assembled properly and securely Do not drop-start the power tool – –...
  • Page 6 STIHL recommends you condition before continuing work – see also have this work done by a STIHL servicing dealer. "Before Starting". Take special care in slippery conditions – damp, Check in particular that the fuel system has no snow, ice, on slopes or uneven ground.
  • Page 7 For manually adjustable mowing heads, always and have a suitable geometry (shape, thickness). switch off the engine before adjusting the mow‐ A metal cutting attachment not made by STIHL ing line – risk of injury! must not have a different weight, thickness,...
  • Page 8 Use only a spark plug of the type approved by The period of usage is prolonged by: STIHL and make sure it is in good condition – – Hand protection (wearing warm gloves) see "Specifications". – Work breaks Inspect the ignition lead (insulation in good con‐...
  • Page 9 To reduce the risk of serious injury, never use wire or metal-reinforced line in place of the nylon line. 2.15 STIHL Polycut Mowing Head with Polymer Blades For mowing unobstructed edges of meadows (without posts, fences, trees or similar obsta‐...
  • Page 10 English 2 Safety Precautions and Working Techniques 2.17 Grass Cutting Blade WARNING Never use wire in place of the nylon mowing line – risk of injury. 2.16 Risk of Kickout (Blade Thrust) with Metal Cutting Attachments WARNING When using metal cutting attach‐ ments there is a risk of kickout when the rotating blade comes into contact with a solid object such as a tree...
  • Page 11 (STIHL recommends a STIHL recommends that you use the non-sha‐ STIHL servicing dealer). ded area of the circular saw blade. Always start 2.19 Circular Saw Blade the cut with this area of the blade.

  • Page 12: Approved Combinations Of Cutting Attach- Ment, Deflector, Handle And Harness

    (Ø 230 mm) Cutting attachments 10 Grass cutting blade 230‑8 (Ø 230 mm) 3.2.1 Mowing heads 11 Grass cutting blade 250‑32 1 STIHL SuperCut 20‑2 (Ø 250 mm) 2 STIHL AutoCut C 26‑2 12 Brush knife 250‑3 3 STIHL AutoCut 25‑2 0458-426-0121-B...

  • Page 13: Approved Power Tool Attachments

    Attachments firmly together. ► Release the wing screw (3) – the clamps are The following STIHL attachments may be used loose once the wing screw has been released. with the basic power tool: They are pushed apart by the two...
  • Page 14 English 5 Mounting the Bike Handle 5.1.2 Securing the Handlebar 5.1.3 Mounting the Control Handle ► Place the handlebar (7) in the lower clamp (1) so that distance A is no more than 15 cm (6 in). ► Place the upper clamp in position and hold both clamp moldings together.
  • Page 15 5 Mounting the Bike Handle English 5.1.4 Fitting the Throttle Cable 5.1.6 Swiveling the Handlebar Transport position NOTICE Do not kink the throttle cable or lay it in tight radii – make sure the throttle trigger moves freely. 90° ► Loosen the wing screw (3) and unscrew it until the handlebar (7) can be rotated.

  • Page 16: Mounting The Loop Handle

    English 6 Mounting the Loop Handle Mounting the Loop Handle ► Position the clamp (6) against the drive tube. ► Place the barrier bar (2) in position as shown. Mounting Loop Handle with ► Line up the holes. ► Insert the screws (7) in the holes and screw Barrier Bar them into the barrier bar (2) as far as stop.

  • Page 17: Adjusting The Throttle Cable

    7 Adjusting the Throttle Cable English Securing the Loop Handle ► Set the throttle trigger to the full throttle posi‐ tion. ► Carefully rotate the screw in the throttle trigger in the direction of the arrow until you feel initial resistance.

  • Page 18: Mounting The Deflector

    English 9 Mounting the deflector Mounting the deflector Fitting the Skirt and Blade Mounting the Deflector WARNING Risk of injury from thrown objects and contact with the cutting attachment. These parts must be fitted to the deflector (1) when you use a mowing head.

  • Page 19: Mounting The Cutting Attachment

    10 Mounting the Cutting Attachment English Mounting the Limit Stop WARNING Risk of injury from thrown objects and contact with the cutting attachment. Always fit the limit stop (6) when you use a circular saw blade. ► Position the limit stop (6) on the gearbox flange.
  • Page 20 English 10 Mounting the Cutting Attachment 10.3 Blocking the Shaft ► Take the rider plate (4) off the shaft (5). Do not remove the thrust plate (6). 10.5 Mounting the Cutting Attach‐ ment WARNING Risk of injury from thrown objects and contact with the cutting attachment.
  • Page 21 10 Mounting the Cutting Attachment English 10.8 Mounting Metal Cutting Attach‐ ments Keep the leaflet and packaging of the metal cut‐ ting attachment in a safe place. WARNING Wear protective gloves to reduce the risk of direct contact with the sharp cutting edges. Mount only one metal cutting attachment.

  • Page 22: Fuel

    Poor quality gasoline or STIHL MotoMix may be stored for up to 2 years engine oil may damage the engine, sealing rings, without any problems. hoses and the fuel tank.

  • Page 23: Fitting The Harness

    ► Adjust the length of the strap so that the cara‐ not overfill the tank. biner (2) is about a hand’s width below your right hip. STIHL recommends you use the STIHL filler noz‐ ► Balance the machine – see "Balancing the zle for fuel (special accessory). Machine".

  • Page 24: Balancing The Machine

    English 14 Balancing the Machine 14 Balancing the Machine 13.2 Full Harness 14.1 Attaching Machine to Harness ► Put on the harness (1) and close the locking plate (3). ► Adjust the length of the strap – with the The type and style of the shoulder strap and car‐ machine attached, the carabiner (2) must be abiner depend on the market.
  • Page 25 14 Balancing the Machine English Circular saw blades (B) ► should "hover" about 20 cm (8 in) above the ground. When the correct balanced position has been reached: ► Tighten down the screw (1) on the carrying ring firmly. 14.3 Disconnecting Machine from Harness ►...

  • Page 26: Starting / Stopping The Engine

    English 15 Starting / Stopping the Engine 15 Starting / Stopping the ignition – see "Function of stop switch and Engine ignition system". 15.1 Controls 15.1.3 Function of stop switch and ignition system 15.1.1 Version with Bike Handle The ignition is switched off and the engine stop‐ ped when the stop switch is pressed.
  • Page 27 15 Starting / Stopping the Engine English 15.2.1 Cranking ► Pull the starter grip slowly until you feel it engage and then give it a brisk strong pull. NOTICE Do not pull out the starter rope all the way – it might otherwise break.

  • Page 28: Transporting The Unit

    English 16 Transporting the Unit 15.4 Other Hints on Starting Engine stalls in cold start position g or under acceleration. ► Move the choke knob to < and continue cranking until the engine runs. Engine does not start in warm start position < ►...
  • Page 29 16 Transporting the Unit English ► Disconnect wire rod from the transport guard. ► Swing wire rod outwards. 16.4 Grass Cutting Blades up to ► Fit the transport guard on the cutting attach‐ 260 mm ment from below. ► Swing wire rod into position. ►...

  • Page 30: Operating Instructions

    English 17 Operating Instructions 16.5 Circular Saw Blades ► Swing wire rod into position. ► Hook wire rod to the transport guard. 17 Operating Instructions 17.1 During break-in period A factory-new machine should not be run at high revs (full throttle off load) for the first three tank fillings.

  • Page 31: Adjusting The Carburetor

    ► Loosen the screws (1). eroded. Install only suppressed spark plugs of ► Remove the filter cover (2). the type approved by STIHL – see "Specifica‐ ► Clean away loose dirt from around the filter. tions". ► Remove the filter element (3).

  • Page 32: Engine Running Behavior

    ► Remove the screw plug (1). ► If no grease can be seen on the inside of the screw plug (1): Screw the tube (2) of STIHL gear lubricant (special accessory) into the filler hole.

  • Page 33: Maintaining The Mowing Head

    ► After resharpening about 5 times, check the it to the right length. cutting attachment for out-of-balance on a STIHL balancer (special accessory) or have it Fresh line is advanced every time the mowing checked by a dealer and re-balanced as nec‐...

  • Page 34: Maintenance And Care

    Precut lengths of nylon line can be fitted to the instructions for the mowing head in a safe place. PolyCut in place of the cutting blades. WARNING STIHL DuroCut, STIHL PolyCut To reduce the risk of injury, always shut off the WARNING engine before installing the blades.

  • Page 35: Minimize Wear And Avoid Damage

    Gearbox lubrication Check Replenish Safety labels Replace 1)STIHL recommends an authorized STIHL servicing dealer.2)Only if there is a noticeable loss of engine power 27 Minimize Wear and Avoid The power tool must be operated, maintained Damage and stored with the due care and attention described in this owner's manual.

  • Page 36: Main Parts

    STIHL recommends that you have servicing and repair work carried out exclusively by an author‐ 1 Tank cap ized STIHL servicing dealer. STIHL dealers are...

  • Page 37: Specifications

    5 Deflector for all mowing attachments FS 91 with bike handle: 93 dB(A) 6 Skirt for mowing heads FS 91 R with barrier bar: 93 dB(A) 7 Metal mowing attachment Sound power level L to ISO 22868...

  • Page 38: Maintenance And Repairs

    Exhaust Emissions The CO value measured in the EU type approval procedure is specified at www.stihl.com/co2. STIHL products must not be thrown in the gar‐ The measured CO value was determined on a bage can. Take the product, accessories and representative engine in accordance with a packaging to an approved disposal site for envi‐...

  • Page 39: Ukca Declaration Of Conformity

    Equipment for use Outdoors Regulations 2001, 108 dB(A) Schedule 8, using the ISO 10884 standard. Technical documents deposited at: Measured sound power level ANDREAS STIHL AG & Co. KG 106 dB(A) Produktzulassung Guaranteed sound power level The year of manufacture and serial number are applied to the product.
  • Page 40 *04584260121B* 0458-426-0121-B...

This manual is also suitable for:

Fs 91r

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