Stihl SR 420 Instruction Manual
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- Instruction manual (86 pages) ,
- Instruction manual (32 pages) ,
- Assembly instructions manual (36 pages)
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Table of Contents
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Summary of Contents for Stihl SR 420
- Page 1 SR 420 2 - 25 Instruction Manual...
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Page 2: Table Of Contents
..............14 Engineering improvements Metering Unit..........15 Filling the Container........16 STIHL's philosophy is to continually improve all Mistblowing..........17 of its products. For this reason we may modify Cleaning the Air Filter....... 17 the design, engineering and appearance of our Adjusting the Carburetor...... - Page 3 Only use parts and accessories that are explicitly The use of machines that emit noise may be limi‐ approved for this power tool by STIHL or are ted to certain hours of the day as specified by technically identical. If you have any questions in national and/or regional or local regulations.
- Page 4 English 2 Safety Precautions and Working Techniques – Do not mix different plant protection products Wear "personal" sound protection, e.g. ear unless such a mixture is approved by the man‐ defenders. ufacturer Breathing plant control chemicals may endanger 2.5.2 Filling the Solution Container your health.
- Page 5 2 Safety Precautions and Working Techniques English – Store and transport spray solution only in This helps reduce the risk of unit vibrations caus‐ approved containers ing an incorrectly tightened fuel cap to loosen or – Never store the spray solution in containers come off and spill quantities of fuel.
- Page 6 English 2 Safety Precautions and Working Techniques 2.11 Holding and guiding the – the assistant is not standing in the area of the outlet nozzle machine – The assistant leaves the work area immedi‐ ately after you have put the power tool on your back 2.10 Dusting and Granulate Spread‐...
- Page 7 2 Safety Precautions and Working Techniques English Watch out for obstacles: Be careful of refuse, condition before continuing work – see also tree stumps, roots and ditches which could "Before Starting". Check the fuel system for cause you to trip or stumble leaks and make sure the safety devices are working properly.
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Page 8: Assembling The Unit
Check the fuel filler cap for leaks at regular inter‐ Mounting the Extension Tube vals. Use only a spark plug of the type approved by STIHL and make sure it is in good condition – see "Specifications". Inspect the ignition lead (insulation in good con‐ dition, secure connection). -
Page 9: Harness
4 Harness English ► Use hose clips (4) to secure hose (1) and hose (3) to the stubs on the stop cock. ► Close the stop cock (move lever to vertical position). ► Fill up with water and check all hose connec‐ tions for leaks. -
Page 10: Fuel
27% (E27). 5.2.2 Engine oil If you mix the fuel yourself, use only STIHL two- stroke engine oil or another high-performance Before using the machine, make yourself familiar engine oil classified as JASO FB, JASO FC, with how to release and throw off the backpack. -
Page 11: Fueling
STIHL MotoMix however can be stored for up to 5 years without any problems. ► Shake the canister containing the fuel mixture thoroughly before refueling WARNING Pressure may have built up in the canister –... -
Page 12: Information Before You Start
English 7 Information Before You Start WARNING After fueling, tighten down the filler cap as securely as possible by hand. Information Before You Start NOTICE With the engine stopped and before starting, ► Slide the stop switch (1) to # check the air intake grille between the backplate ►... - Page 13 8 Starting / Stopping the Engine English 8.1.2 If the engine is cold ► Place the unit securely on the ground and make sure that bystanders are well clear of the nozzle outlet. ► Make sure you have a firm footing: Hold the unit with your left hand on the housing and put one foot against the base plate to prevent it slipping.
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Page 14: Calculating Required Quantity Of Solution
English 9 Calculating Required Quantity of Solution As Soon as Engine Runs 8.5.3 If fuel tank has been run completely dry and then refueled ► Pull the starter rope several times to prime the fuel system. Calculating Required Quantity of Solution Determining surface area (m In the case of ground crops, simply multiply the length of the field by its width. -
Page 15: Metering Unit
10 Metering Unit English The values determined above and a working width of 4 meters require the following setting on = Quantity of active ingredient in liters the metering unit: K K = Concentration in % 144 l x 10 (m/min) x 4 m = 1.6 l/min = Required quantity of solution in liters 3600 m... -
Page 16: Filling The Container
English 11 Filling the Container 10.2 Metering knob ULV metering knob Discharge rate in l/min Blower tube angle Knob set‐ ‑30° 0° +30° ting 0.142 0.132 0.128 0.65 0.216 0.212 0.203 0.352 0.403 0.377 10.5 Checking metering unit ► Place the machine on the ground. ►... -
Page 17: Mistblowing
12 Mistblowing English 12.3 Dual Deflector Screen ► The gasket (1) in the cap must always be lubricated with grease. Splits the spray jet in two – allows two closely ► Fit the cap and tighten it down firmly. planted rows to be treated in one pass. 12 Mistblowing 13 Cleaning the Air Filter ►... -
Page 18: Adjusting The Carburetor
English 14 Adjusting the Carburetor ► Check the spark arresting screen (not in all models, country-specific) in the muffler and clean or replace if necessary. ► Carefully turn both adjusting screws counter‐ clockwise as far as stop. ► The high speed screw (H) is 1/4 turn open. ►... -
Page 19: Spark Arresting Screen In Muffler
15 Spark Arresting Screen in Muffler English 14.3 Fine Tuning for Operation at NOTICE High Altitude After returning from high altitude, reset the car‐ A slight correction of the setting may be neces‐ buretor to the standard setting. sary if engine does not run satisfactorily: ►... -
Page 20: Spark Plug
– or sooner if the electrodes are badly – Too much oil in fuel mix. eroded. Install only suppressed spark plugs of – Dirty air filter. the type approved by STIHL – see "Specifica‐ – Unfavorable running conditions. tions". 16.1 Removing the Spark Plug ►... -
Page 21: Maintenance And Care
18 Maintenance and Care English 17.1 If not used for periods of about ► Start the engine and run it at idling speed until it stops 30 days or longer ► Thoroughly clean the machine, especially the ► Drain and clean the fuel tank in a well ventila‐ cylinder fins and air filter ted area. -
Page 22: Minimize Wear And Avoid Damage
STIHL recommends STIHL dealers 19 Minimize Wear and Avoid STIHL recommends that you have servicing and Damage repair work carried out exclusively by an author‐ ized STIHL servicing dealer. STIHL dealers are Observing the instructions in this manual helps regularly given the opportunity to attend training reduce the risk of unnecessary wear and dam‐... -
Page 23: Main Parts
21 Main Parts English – Rewind starter 22 Fuel filler cap – Spark plug 23 Starter grip – Damping elements of anti-vibration system 24 Fuel tank 21 Main Parts 25 Muffler # Serial number 22 Specifications 22.1 Engine Single cylinder two-stroke engine Displacement: 56.5 cc Bore:... -
Page 24: Maintenance And Repairs
When repairing the machine, only use replace‐ 22.10 Vibration level a in accord‐ hv,eq ment parts which have been approved by STIHL ance with ISO 8662 for this power tool or are technically identical. Only use high-quality replacement parts in order... - Page 25 ISO 12100, EN 55012, EN 61000‑6‑1, EN ISO 28139 Technical documents deposited at: ANDREAS STIHL AG & Co. KG Produktzulassung The year of manufacture and serial number are applied to the product. Done at Waiblingen, 03.02.2020 ANDREAS STIHL AG &...
- Page 26 English 25 EC Declaration of Conformity 0458-372-0121-C...
- Page 27 25 EC Declaration of Conformity English 0458-372-0121-C...
- Page 28 *04583720121C* 0458-372-0121-C...