Stihl FS 120 Instruction Manual
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Stihl FS 120 Instruction Manual

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FS 120, 120 R, 250
2 - 42
Instruction Manual

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Summary of Contents for Stihl FS 120

  • Page 1 FS 120, 120 R, 250 2 - 42 Instruction Manual...

  • Page 2: Table Of Contents

    Caution where there is a risk of damaging the if you have any queries concerning this product. machine or its individual components. Engineering improvements STIHL's philosophy is to continually improve all of its products. For this reason we may modify 0458-250-0121-F...

  • 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 Do not drop-start the power tool – start the engine as described in the attachment, deflector, handle and harness. All User Manual. The cutting attachment parts must be assembled properly and runs on for a short while after releas‐...
  • Page 6 – see also adjustments or repairs. STIHL recommends you "Before Starting". have this work done by a STIHL servicing dealer. Check in particular that the fuel system has no Take special care in slippery conditions – damp, leaks and the safety equipment is fully operative.
  • Page 7 – risk of injury! and have a suitable geometry (shape, thickness). Misuse with mowing lines that are too long A metal cutting attachment not made by STIHL reduces the working speed of the engine. The must not have a different weight, thickness, constant slipping of the clutch causes overheat‐...
  • Page 8 No general recommendation can be given for the Use only a spark plug of the type approved by length of usage because it depends on several STIHL and make sure it is in good condition – factors. see "Specifications". The period of usage is prolonged by: 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

    Cutting attachment Deflector, limit stop Handle Carrying strap Permissible combinations 2 STIHL AutoCut 25‑2 / AutoCut 27-2 Choose the correct combination from the table 3 STIHL AutoCut C 26‑2 depending on the cutting tool! 4 STIHL AutoCut 36‑2 5 STIHL TrimCut 31‑2 WARNING 6 STIHL TrimCut 32‑2...

  • Page 13: Approved Power Tool Attachments

    25 Bike handle Shoulder straps 26 Shoulder strap must be used 27 Full harness can be used 28 Full harness must be used Approved Power Tool Attachments The following STIHL attachment may be moun‐ ted to the basic power tool: 0458-250-0121-F...
  • Page 14 English 5 Mounting the Bike Handle on the left (viewing direction from engine to handlebar) ► Place the clamp (7) on the handlebar support ► Insert the screws (8) through the holes in the parts and screw them into the clamp (3) as far as they will go ►...

  • Page 15: Mounting The Loop Handle

    6 Mounting the Loop Handle English Mounting the Loop Handle Fastening the Throttle Cable Mounting Loop Handle with NOTICE Barrier Bar Do not kink the throttle cable or lay it in tight radii – make sure the throttle trigger moves freely. ►...

  • Page 16: Adjusting The Throttle Cable

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

  • Page 17: Fitting The Carrying Ring

    8 Fitting the Carrying Ring English Fitting the Carrying Ring Polymer Version ► Use a suitable tool to push the slide to the end of the slot (see illustration). ► Press down the trigger lockout (1) and squeeze the throttle trigger (2) (full throttle position) –...

  • 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 thrust washer (3) off the shaft (4). Do not remove the thrust plate (5). 10.5 Mounting the Cutting Attach‐ ment WARNING Use a deflector that matches the cutting attach‐ ment –...
  • Page 21 10 Mounting the Cutting Attachment English 10.8 Mounting Metal Cutting Attach‐ WARNING ments Direction of rotation is indicated by an arrow on Keep the leaflet and packaging of the metal cut‐ the inside of the deflector. ting attachment in a safe place. WARNING Wear protective gloves to reduce the risk of direct contact with the sharp cutting edges.

  • Page 22: Fuel

    Remove the tool used to block the shaft. 11.2.2 Engine oil 10.9 Removing the Metal Cutting If you mix the fuel yourself, use only STIHL two- stroke engine oil or another high-performance Attachment engine oil classified as JASO FB, JASO FC, JASO FD, ISO-L-EGB, ISO-L-EGC or ISO-L- WARNING EGD.

  • Page 23: Fueling

    12.2 Filling Up with Fuel Take care not to spill fuel while fueling and do not overfill the tank. STIHL recommends you use the STIHL filler nozzle for fuel (special acces‐ sory). ► Open the tank cap. ► Fill up with fuel.
  • Page 24 English 13 Fitting the Harness 13.2 Full Harness 13.3 Attaching Machine to Harness ► Put on the harness (1) and close the locking The type and style of the harness and carabiner plate (3). (spring hook) depend on the market. ►...

  • Page 25: Balancing The Machine

    14 Balancing the Machine English 13.4 Disconnecting Machine from Harness ► Loosen the screw (1). ► Slide the carrying ring (2) along the drive tube. ► Tighten the screw moderately. ► Press down the bar on the carabiner (1) and ►...

  • Page 26: Starting / Stopping The Engine

    English 15 Starting / Stopping the Engine 15.1.2 Control handle on drive tube Circular saw blades ► should "hover" about 20 cm (8 in) above the ground. When the correct floating position has been reached: ► Tighten down the screw on the carrying ring firmly.
  • Page 27 15 Starting / Stopping the Engine English NOTICE Do not stand or kneel on the drive tube. ► Set the choke knob (8) to: if the engine is cold for warm start – also use this position if the engine has been running but is still cold. ►...

  • Page 28: Transporting The Unit

    English 16 Transporting the Unit 16.2 230 mm Grass Cutting Blades ► Open the throttle slightly. ► Warm up the engine for a short period. 15.5 If the engine does not start 15.5.1 Choke knob If you did not turn the choke knob to e quickly enough after the engine began to fire, the com‐...
  • Page 29 16 Transporting the Unit English 16.3 250 mm Brush Knives 16.4 Grass Cutting Blades up to 260 mm ► Disconnect wire rod from the transport guard. ► Swing wire rod outwards. ► Fit the transport guard on the cutting attach‐ ment from below.

  • Page 30: Operating Instructions

    English 17 Operating Instructions ► Swing wire rod into position. ► Hook wire rod to the transport guard. 16.5 Circular Saw Blades ► Swing wire rod outwards. ► Fit transport guard on saw blade from below, making sure the limit stop is properly seated in the recess.

  • Page 31: Air Filter

    18 Air filter English 19 Adjusting the Carburetor 17.2 During Operation After a long period of full throttle operation, allow 19.1 General Information the engine to run for a short while at idle speed The carburetor comes from the factory with a so that engine heat can be dissipated by the flow standard setting.

  • Page 32: Spark Plug

    – or sooner if the electrodes are badly checked and repaired by your servicing dealer. eroded. Install only suppressed spark plugs of the type approved by STIHL – see "Specifica‐ 19.4.3 Erratic idling behavior, poor accelera‐ tions".

  • Page 33: Engine Running Behavior

    – Unfavorable running conditions. cause may be the muffler. Have the muffler checked by a servicing dealer for contamination (carbonization). STIHL recommends that you have servicing and repair work carried out exclusively by an author‐ ized STIHL servicing dealer. 22 Lubricating the Gearbox 22.1...

  • Page 34: Replacing The Starter Rope And Rewind Spring

    23 Replacing the Starter Rope and Rewind Spring ► If no grease can be seen on the inside of the WARNING screw plug (1): Screw the tube (2) of STIHL gear lubricant (special accessory) into the filler The rewind spring may pop out and uncoil during hole.

  • Page 35: Storing The Machine

    24 Storing the Machine English WARNING The bits of the spring may still be under tension and could fly apart when you remove the rope rotor and spring housing. To reduce the risk of injury, Wear a face shield and work gloves. ►...

  • Page 36: Sharpening Metal Cutting Blades

    Resharpen with a grinder or have the work done by a dealer – STIHL recommends a STIHL servicing dealer. ► Sharpen frequently, take away as little metal as possible – two or three strokes of the file are usually enough.

  • Page 37: Inspection And Maintenance By User

    The thermoplastic cutting blades are referred to 28.1 Maintenance Work as "blades" in the following. STIHL recommends that you have servicing and The mowing head is supplied with illustrated repair work carried out exclusively by an author‐ instructions for replacing the blades. Keep the ized STIHL servicing dealer.

  • Page 38: Maintenance And Care

    English 29 Maintenance and Care 28.2 Antivibration Element A vibration-absorbing rubber element is installed between the powerhead and the drive tube. Have it checked if there are signs of wear or a noticeable increase in vibration levels. 29 Maintenance and Care The following intervals apply for normal operating conditions.

  • Page 39: Minimize Wear And Avoid Damage

    The power tool must be operated, maintained STIHL recommends that you have servicing and and stored with the due care and attention repair work carried out exclusively by an author‐ described in this owner's manual.

  • Page 40: Main Parts

    9 Limit stop for circular saw blades only 6 Bike handle (handlebar) 7 Throttle trigger 32 Specifications 8 Slide control 32.1 Engine 9 Throttle trigger lockout STIHL single cylinder two-stroke engine 10 Handle support 11 Throttle cable retainer 32.1.1 FS 120 12 Carrying ring Displacement: 30.8 cc...
  • Page 41 Bore: 40 mm FS 120: 6.3 m/s 5.0 m/s Stroke: 32 mm FS 120 R: 8.0 m/s 9.0 m/s Engine power to ISO 8893: 1.6 kW (2.2 bhp) at FS 250: 5.7 m/s 4.3 m/s 9,000 rpm Idle speed:...

  • Page 42: Maintenance And Repairs

    When repairing the machine, only use replace‐ ards in the versions valid on the date of produc‐ ment parts which have been approved by STIHL tion: for this power tool or are technically identical.
  • Page 43 35 EC Declaration of Conformity English 0458-250-0121-F...
  • Page 44 *04582500121F* 0458-250-0121-F...

This manual is also suitable for:

Fs 120 rFs 250Fs 250 r

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