Instruction Manual
Page 2
...Specifications 37 Special Accessories 38 Maintenance and Repairs 38 STIHL Incorporated Federal Emission Control Warranty Statement 39 Trademarks 41 STIHl SR 340, SR 420 English / USA Allow only persons who understand this Manual, please contact your STIHL mistblower, it is to -time. M0,8. To... 14 Harness 16 Fuel 17 Fueling 18 Information Before You Start .......... 18 Starting / Stopping the Engine ........ 19 Calculating Required Quantity of personal injury. KG, 2006 0458 372 8621 A. J6. © ANDREAS STIHL AG & Co. BA_SE_004_007_01_05.fm Contents Guide to reduce the...
...Specifications 37 Special Accessories 38 Maintenance and Repairs 38 STIHL Incorporated Federal Emission Control Warranty Statement 39 Trademarks 41 STIHl SR 340, SR 420 English / USA Allow only persons who understand this Manual, please contact your STIHL mistblower, it is to -time. M0,8. To... 14 Harness 16 Fuel 17 Fueling 18 Information Before You Start .......... 18 Starting / Stopping the Engine ........ 19 Calculating Required Quantity of personal injury. KG, 2006 0458 372 8621 A. J6. © ANDREAS STIHL AG & Co. BA_SE_004_007_01_05.fm Contents Guide to reduce the...
Instruction Manual
Page 9
... cap in the tank to refuel the unit until the leak is running. Always shut off any spilled fuel has been wiped away. If this STIHL cap, raise the grip on your clothing. Cap with different fuel caps. If the grip does not lie completely flush with the triangular marks on..., SR 420 In order to get fuel on the fuel tank opening lining up in the fuel tank opening , the cap is upright at least 10 feet (3 m) from the fueling spot before starting your clothing immediately. Wipe off the engine and allow any pressure build-up . To do not start or run the engine...
... cap in the tank to refuel the unit until the leak is running. Always shut off any spilled fuel has been wiped away. If this STIHL cap, raise the grip on your clothing. Cap with different fuel caps. If the grip does not lie completely flush with the triangular marks on..., SR 420 In order to get fuel on the fuel tank opening lining up in the fuel tank opening , the cap is upright at least 10 feet (3 m) from the fueling spot before starting your clothing immediately. Wipe off the engine and allow any pressure build-up . To do not start or run the engine...
Instruction Manual
Page 10
... follow normal operating procedures. the chemicals being sucked into contact with chemical solution. Always check your power tool in good condition. SR 340, SR 420 9 Do not use a power tool that is securely attached and in well-ventilated areas, outdoors. !Warning! To fill the..., check that the spark plug boot is securely attached and in the tank. !Warning! Check for proper condition and operation before starting, particularly the throttle trigger, setting lever and stop cock closed . a loose boot may cause arcing that it properly assembled and practice...
... follow normal operating procedures. the chemicals being sucked into contact with chemical solution. Always check your power tool in good condition. SR 340, SR 420 9 Do not use a power tool that is securely attached and in well-ventilated areas, outdoors. !Warning! To fill the..., check that the spark plug boot is securely attached and in the tank. !Warning! Check for proper condition and operation before starting, particularly the throttle trigger, setting lever and stop cock closed . a loose boot may cause arcing that it properly assembled and practice...
Instruction Manual
Page 11
... parts, check the fan housing for singlehanded operation with hot exhaust fumes, the engine should not stand in placing the unit on your hand. Starting Start the engine at idle speed during this position to reduce the risk of the outlet nozzle or exhaust. For specific...fueling spot, outdoors only. !Warning! When you are at all times. 10 SR 340, SR 420 To reduce the risk of loss of control, never carry the unit with the straps of another person may result in injury to your STIHL dealer for repair. The assistance of the harness over one -person machine. English...
... parts, check the fan housing for singlehanded operation with hot exhaust fumes, the engine should not stand in placing the unit on your hand. Starting Start the engine at idle speed during this position to reduce the risk of the outlet nozzle or exhaust. For specific...fueling spot, outdoors only. !Warning! When you are at all times. 10 SR 340, SR 420 To reduce the risk of loss of control, never carry the unit with the straps of another person may result in injury to your STIHL dealer for repair. The assistance of the harness over one -person machine. English...
Instruction Manual
Page 12
...repeated inhalation of chemical encountered. Use good work practices, such as operating the unit so that a mistblower filled with respect to it. SR 340, SR 420 11 Use caution when bending, leaning or walking. !Warning! To reduce the risk of stumbling and loss of the chemical spray/dust... chemicals may need to ensure proper balance. For better footing, clear away fallen branches, scrub and cuttings. Working conditions Operate and start your size before using the machine in difficult, overgrown terrain. As soon as the engine is running, this product generates toxic exhaust...
...repeated inhalation of chemical encountered. Use good work practices, such as operating the unit so that a mistblower filled with respect to it. SR 340, SR 420 11 Use caution when bending, leaning or walking. !Warning! To reduce the risk of stumbling and loss of the chemical spray/dust... chemicals may need to ensure proper balance. For better footing, clear away fallen branches, scrub and cuttings. Working conditions Operate and start your size before using the machine in difficult, overgrown terrain. As soon as the engine is running, this product generates toxic exhaust...
Instruction Manual
Page 19
After fueling, tighten fuel cap as securely as to release slowly. Always thoroughly shake the mixture in the canister before starting, check the air intakes between the backplate and powerhead for a long period, drain and clean the fuel tank and run engine until ... KN English / USA Fueling Information Before You Start With the engine stopped and before fueling your machine for blockages and clean if necessary. Before fueling, clean the filler cap and the area around it to the idle position. 18 SR 340, SR 420 The throttle cable disconnects itself automatically when the ...
After fueling, tighten fuel cap as securely as to release slowly. Always thoroughly shake the mixture in the canister before starting, check the air intakes between the backplate and powerhead for a long period, drain and clean the fuel tank and run engine until ... KN English / USA Fueling Information Before You Start With the engine stopped and before fueling your machine for blockages and clean if necessary. Before fueling, clean the filler cap and the area around it to the idle position. 18 SR 340, SR 420 The throttle cable disconnects itself automatically when the ...
Instruction Manual
Page 20
..., turn the choke knob to g : If the engine is warm, turn the choke lever to the center position - SR 340, SR 420 19 this position if the engine has been running but is still cold. Starting / Stopping the Engine 1 English / USA 373BA010 KN 373BA008 KN 373BA011 KN 2 373BA009 KN : Observe safety precautions - see chapter...
..., turn the choke knob to g : If the engine is warm, turn the choke lever to the center position - SR 340, SR 420 19 this position if the engine has been running but is still cold. Starting / Stopping the Engine 1 English / USA 373BA010 KN 373BA008 KN 373BA011 KN 2 373BA009 KN : Observe safety precautions - see chapter...
Instruction Manual
Page 22
SR 340, SR 420 21 Fuel tank run until dry and then refueled : Pull the starter rope several times to clear the combustion chamber. warm up As soon as engine runs: : Move the setting lever (2) to idle speed. : Open throttle slightly - If the engine does not start: If you did not turn the choke knob... to e quickly enough after the engine began to fire, the combustion chamber is cold. : Now start the engine. 2 1 373BA014 KN English / USA : Fit the spark plug and reconnect the spark plug boot. : Move the stop switch to # : Turn the choke knob ...
SR 340, SR 420 21 Fuel tank run until dry and then refueled : Pull the starter rope several times to clear the combustion chamber. warm up As soon as engine runs: : Move the setting lever (2) to idle speed. : Open throttle slightly - If the engine does not start: If you did not turn the choke knob... to e quickly enough after the engine began to fire, the combustion chamber is cold. : Now start the engine. 2 1 373BA014 KN English / USA : Fit the spark plug and reconnect the spark plug boot. : Move the stop switch to # : Turn the choke knob ...
Instruction Manual
Page 26
.... do not vary the flow rate via the stop cock. : Fill up with water up to 10 liter mark. : Set the metering knob to "6" : Start the machine. : Hold the spray tube horizontally, run the engine at full throttle, spray the contents of deviations: : Check the metering unit for contamination and... clean it down to the 5 liter mark and note the time taken. do not exceed maximum level of low-growing crops. for assistance. SR 340, SR 420 25 Tapered baffle screen In case of the container down tightly. 372BA007 KN Diverts spray jet at an angle - The time required to be ...
.... do not vary the flow rate via the stop cock. : Fill up with water up to 10 liter mark. : Set the metering knob to "6" : Start the machine. : Hold the spray tube horizontally, run the engine at full throttle, spray the contents of deviations: : Check the metering unit for contamination and... clean it down to the 5 liter mark and note the time taken. do not exceed maximum level of low-growing crops. for assistance. SR 340, SR 420 25 Tapered baffle screen In case of the container down tightly. 372BA007 KN Diverts spray jet at an angle - The time required to be ...
Instruction Manual
Page 27
... : Turn choke knob to be treated simultaneously. 1 2 1 43 5 372BA008 KN 373BA017 KN 373BA018 KN Dirty air filters reduce engine power increase fuel consumption and make starting more difficult. English / USA Cleaning the Air Filter Dual deflector baffle screen Splits the spray jet in two - allows two closely planted rows to g : Release... (4) out of the filter cover. : If the prefilter is a noticeable loss of your hand or blow out with compressed air. : Always replace a damaged prefilter. 26 SR 340, SR 420 if it -
... : Turn choke knob to be treated simultaneously. 1 2 1 43 5 372BA008 KN 373BA017 KN 373BA018 KN Dirty air filters reduce engine power increase fuel consumption and make starting more difficult. English / USA Cleaning the Air Filter Dual deflector baffle screen Splits the spray jet in two - allows two closely planted rows to g : Release... (4) out of the filter cover. : If the prefilter is a noticeable loss of your hand or blow out with compressed air. : Always replace a damaged prefilter. 26 SR 340, SR 420 if it -
Instruction Manual
Page 29
... filter and clean or replace if necessary. : Check the spark arresting screen (if fitted) in the muffler and clean or replace if necessary. : Carefuly turn : Start and warm up the engine. : Turn the high speed screw (H) clockwise (leaner) - If the setting is too lean, there is a risk of the setting may... lean: : Turn low speed screw (L) counterclockwise - Fine tuning for operation at high altitude A slight correction of engine damage due to insufficient lubrication and overheating. 28 SR 340, SR 420 until the engine runs and accelerates smoothly.
... filter and clean or replace if necessary. : Check the spark arresting screen (if fitted) in the muffler and clean or replace if necessary. : Carefuly turn : Start and warm up the engine. : Turn the high speed screw (H) clockwise (leaner) - If the setting is too lean, there is a risk of the setting may... lean: : Turn low speed screw (L) counterclockwise - Fine tuning for operation at high altitude A slight correction of engine damage due to insufficient lubrication and overheating. 28 SR 340, SR 420 until the engine runs and accelerates smoothly.
Instruction Manual
Page 30
...filter. : Unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. SR 340, SR 420 29 Rectify problems which may result in trouble in the gasoline), a dirty air filter and unfavorable running ...conditions, e.g. see "Specifications". : Use only resistor type spark plugs of the approved range. Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded. see "Starting...
...filter. : Unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. SR 340, SR 420 29 Rectify problems which may result in trouble in the gasoline), a dirty air filter and unfavorable running ...conditions, e.g. see "Specifications". : Use only resistor type spark plugs of the approved range. Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded. see "Starting...
Instruction Manual
Page 33
... spring tension by one additional turn the rope rotor six full revolutions in the direction of the arrow (see illustration). : Hold the rotor steady - start outside and work inward. Tensioning rewind spring : Make a loop in the unwound starter rope and use it winds onto the rotor. English / USA ...oil. : Remove the rope rotor as described in "Replacing the starter rope". : Remove parts of rope slowly so that it to turn . 32 SR 340, SR 420 straighten the twisted rope. : Release the rotor and let go of old spring. 353BA029 KN 353BA030 KN : Fit new spring housing - bottom plate...
... spring tension by one additional turn the rope rotor six full revolutions in the direction of the arrow (see illustration). : Hold the rotor steady - start outside and work inward. Tensioning rewind spring : Make a loop in the unwound starter rope and use it winds onto the rotor. English / USA ...oil. : Remove the rope rotor as described in "Replacing the starter rope". : Remove parts of rope slowly so that it to turn . 32 SR 340, SR 420 straighten the twisted rope. : Release the rotor and let go of old spring. 353BA029 KN 353BA030 KN : Fit new spring housing - bottom plate...
Instruction Manual
Page 35
..., leaks) x Metering unit Check x x Anti-vibration elements Visual inspection x Have replaced by dealer 1) x x x Check x x Blower air intake screen Clean x Safety labels Replace x 1) STIHL recommends a STIHL servicing dealer 34 SR 340, SR 420 before starting work after finishing work area etc.), shorten the specified intervals accordingly. If your daily working time is longer than normal or operating...
..., leaks) x Metering unit Check x x Anti-vibration elements Visual inspection x Have replaced by dealer 1) x x x Check x x Blower air intake screen Clean x Safety labels Replace x 1) STIHL recommends a STIHL servicing dealer 34 SR 340, SR 420 before starting work after finishing work area etc.), shorten the specified intervals accordingly. If your daily working time is longer than normal or operating...
Instruction Manual
Page 37
... to help the user quickly open the harness straps and throw off the machine in an emergency. 36 SR 340, SR 420 Increases carrying comfort. 14 Air filter housing. Eases engine starting by the engine to start the engine. 23 Fuel tank. Attenuates exhaust noises and diverts exhaust gases away from operator. The spark arresting...
... to help the user quickly open the harness straps and throw off the machine in an emergency. 36 SR 340, SR 420 Increases carrying comfort. 14 Air filter housing. Eases engine starting by the engine to start the engine. 23 Fuel tank. Attenuates exhaust noises and diverts exhaust gases away from operator. The spark arresting...
Instruction Manual
Page 41
...start enrichment system) Intake manifold Air filter Spark plug Magneto or electronic ignition system (ignition module) Catalytic converter (if applicable) Fasteners Where to make a claim for required maintenance at and after the first scheduled replacement point. 40 SR 340, SR 420 Any warranted part which is defective, the part will be replaced by STIHL...misuse, neglect or lack of required maintenance, : repairs improperly performed or replacements not conforming to STIHL Incorporated specifications that a warranted part is defective. Any warranted part which is not scheduled for ...
...start enrichment system) Intake manifold Air filter Spark plug Magneto or electronic ignition system (ignition module) Catalytic converter (if applicable) Fasteners Where to make a claim for required maintenance at and after the first scheduled replacement point. 40 SR 340, SR 420 Any warranted part which is defective, the part will be replaced by STIHL...misuse, neglect or lack of required maintenance, : repairs improperly performed or replacements not conforming to STIHL Incorporated specifications that a warranted part is defective. Any warranted part which is not scheduled for ...