Stihl SR 420 Instruction Manual
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Stihl SR 420 Instruction Manual

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  • Page 1 STIHL SR 420 Instruction Manual...

  • Page 3: Table Of Contents

    English Contents Dear Customer, Guide to Using this Manual Safety Precautions and Working Thank you for choosing a quality engineered STIHL product. Techniques Assembling the Unit It has been built using modern Harness production techniques and comprehensive quality assurance. Fuel...

  • Page 4: Guide To Using This Manual

    This field may Minors should never be allowed to use interfere with some pacemakers. To this product. STIHL's philosophy is to continually reduce health risks, STIHL recommends Keep bystanders, especially children, improve all of its products. For this that persons with pacemakers consult and animals away from the work area.
  • Page 5 If you are spraying overhead, wear explicitly approved for this power tool by impermeable head covering. STIHL or are technically identical. If you have any questions in this respect, Avoid any clothing, consult a servicing dealer. Use only high...
  • Page 6 Keep spray solution out of the reach – of children and animals. Do not spray in windy conditions. – Store the power tool empty and Unfavorable weather conditions may – clean. result in an incorrect concentration of the plant protection product. Overdosing SR 420...
  • Page 7 Do not fuel a hot engine – fuel may spill and cause a fire. The setting lever must move easily – to STOP or 0 SR 420...
  • Page 8 Take special care in slippery conditions damage to the power tool, never operate control handle – even if you are left- – damp, snow, ice, on slopes or uneven it with explosive or combustible handed. ground. materials. SR 420...
  • Page 9 - After Finishing Work lated locations. The force with which the handles – are held (a tight grip restricts Close the valve lever. circulation). Always shut off the engine before taking the power tool off your back. SR 420...

  • Page 10: Assembling The Unit

    Maintenance and Repairs assembly. Use only a spark plug of the type approved by STIHL and make sure it is Service the machine regularly. Do not Mounting the Elbow in good condition – see "Specifications".
  • Page 11 The metering unit (4) must point in the same direction as the control Put the machine on your back. handle. Loosen the clamp screw (1). Move the control handle (2) along the tube to the most comfortable position. Tighten down the clamp screw (1). SR 420...

  • Page 12: Harness

    Lift the tabs of the sliding adjusters. STIHL MotoMix Adjust the harness so that the backplate fits snugly and securely STIHL recommends the use of STIHL against your back. MotoMix. This ready-to-use fuel mix Attach strap hook to the backplate.
  • Page 13 Use only high-quality two-stroke engine location protected from light and the sun. oil – preferably STIHL HP, HP Super or Fuel mix ages – only mix sufficient fuel HP Ultra, which are specially formulated for a few weeks work.

  • Page 14: Fueling

    Position the machine so that the filler cap is facing up. STIHL recommends you use the STIHL filler nozzle for fuel (special accessory). Filling up with fuel Take care not to spill fuel while fueling and do not overfill the tank.

  • Page 15: Starting / Stopping The Engine

    Move setting lever (2) to center position – starting throttle. The setting lever enables you to select and hold any throttle position between (lower stop) idle and full throttle (upper stop). Set the lever to the idle position before switching off the engine. SR 420...
  • Page 16 Move setting lever to lower stop – NOTICE the engine settles down to idle Do not pull out the starter rope all the speed. way – it might otherwise break. Open throttle slightly – warm up the engine for a short period. SR 420...

  • Page 17: Calculating Required Quantity Of Solution

    1 hectare (ha). 0.1 % Concentration of active ingredient – Determining walking speed (mix ratio). Carry out a trial run with the machine fueled and the container filled with water. Operate the spray tube (swing it SR 420...

  • Page 18: Metering Unit

    = Walking speed metering knob – not the stop cock. = Discharge rate b = Working width A = Area Example: The values determined above and a working width of 4 meters require the following setting on the metering unit: SR 420...
  • Page 19 Remove the baffle screen and pressure pump. Discharge rate without pressure pump, Fill the container with water up to 10 with ULV nozzle liter mark. Set the metering knob to position 6. Spray tube 0° to - 30° to the horizontal SR 420...

  • Page 20: Filling The Container

    Deflector Screen The gasket (1) in the cap must always be lubricated with grease. Fit the cap and tighten it down firmly. Diverts spray jet at an angle – for under- leaf treatment of low-growing crops. SR 420...

  • Page 21: Cleaning The Air Filter

    Install the main filter (3) and prefilter (4) in the filter cover. The high speed screw (H) is 1/4 turn open. Fit the cover on the filter base (5) and tighten it down firmly. The low speed screw (L) is 1/4 turn open. SR 420...

  • Page 22: Spark Arresting Screen In Muffler

    It is usually necessary to change the Clean the spark arresting screen if setting of the idle speed screw (LA) after necessary. every correction to the low speed If the spark arresting screen is screw (L). damaged or heavily carbonized, fit a new one. SR 420...

  • Page 23: Spark Plug

    Tighten spark plug with combination electrodes are badly eroded. Install wrench only suppressed spark plugs of the Press the spark plug boot firmly type approved by STIHL – see onto the spark plug "Specifications". Clean dirty spark plug. Check electrode gap (A) and Removing the Spark Plug readjust if necessary –...

  • Page 24: Storing The Machine

    Thoroughly clean the machine – pay special attention to the cylinder fins and air filter. Do not expose the container to direct sunlight for unnecessarily long periods. UV rays can make the container material brittle, which could result in leaks or breakage. SR 420...

  • Page 25: Maintenance And Care

    Clean Check Spark arresting screen in muffler Clean or replace All accessible screws and nuts (not adjust - Retighten ing screws) Visual inspection (condition, leaks) Container with hose Clean Strainer in container Clean or replace Metering unit Check SR 420...
  • Page 26 (very dusty work area, etc.), shorten the specified intervals accordingly. Check Anti-vibration elements Have replaced by servicing dealer Check Air intake screen Clean Safety labels Replace not in all versions, market-specific STIHL recommends an authorized STIHL servicing dealer. SR 420...

  • Page 27: Minimize Wear And Avoid Damage

    English servicing dealer. STIHL dealers are Minimize Wear and Avoid Parts Subject to Wear and regularly given the opportunity to attend Damage Tear training courses and are supplied with the necessary technical information. Observing the instructions in this manual Parts Subject to Wear and Tear...

  • Page 28: Main Parts

    14 Air filter 15 Antivibration elements 16 Strap hook 17 Container cap 18 Container 19 Spark plug boot 20 Carburetor adjusting screws 21 Choke knob 22 Fuel filler cap 23 Starter grip 24 Fuel tank 25 Muffler Serial number SR 420...

  • Page 29: Specifications

    ISO 8662 Container capacity: 13 l Handle, Engine Quantity left in right container: 0.1 l SR 420: 2.3 m/s Mesh size of filler Single cylinder two-stroke engine strainer: 1 mm The K - factor in accordance with Displacement: 56.5 cc Discharge rate (with - Directive 2006/42/EC is 2.5 dB(A) for...

  • Page 30: Maintenance And Repairs

    Take the product, replacement parts which have been accessories and packaging to an conforms to the relevant requirements of approved by STIHL for this power tool or approved disposal site for environment- the Directives 2006/42/EC and are technically identical. Only use high- friendly recycling.
  • Page 31 English Done at Waiblingen, 11.03.2016 ANDREAS STIHL AG & Co. KG Thomas Elsner Director Product Management and Services SR 420...
  • Page 32 0458-372-0121-B englisch www.stihl.com *04583720121B* 0458-372-0121-B...

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