Stihl Br 320, 400
STIHL BR 320, 400
Instruction Manual Owner's Manual Assembling Safety Precautions Operating Instructions Maintenance &RQWHQWV
Parts and Controls 2 Replacing the Starter Rope This Manual contains operating and Safety Precautions 4 and Rewind Spring 20 safety instructions for all STIHL BR 320, Assembling the Blower 10 Operating Instructions 23 BR 320 L, BR 400 blowers. Using the Blower 11 Storing the Machine 23 Pay special attention to the safety Fuel 12 Maintenance Chart 24 precautions outlined on pages 4 to 9. Fueling 13 Specifications 25 Allow only persons who understand this Starting 14 Manual to operate your blower. Cleaning the Air Filter 16 STIHL Incorporated Federal and To receive maximum performance and Adjusting the Carburetor 16 California Emission Control Warranty satisfaction from your STIHL blower, it is Motormanagement 16 Statement 27 important that you read and understand Checking the Spark Plug 18 the maintenance and safety precautions Spark Arresting Screen in Muffler 19 before using your blower. Contact your STIHL dealer or the STIHL distributor for your area if you do not understand any of the instructions in this Manual.
:DUQLQJ Because a blower is a high-speed tool, some special safety precautions must be observed as with any other power tool to reduce the risk of personal injury. Careless or improper use may cause serious or even fatal injury. STIHL’s philosophy is to continually improve all of its products. As a result, engineering changes and improvements are made from time-to-time. If the operating characteristics or the appearance of your blower differ from those described in this Manual, please Printed on chlorine-free paper contact your STIHL dealer for information and assistance.
1999 Andreas Stihl AG & Co., Waiblingen
0458 353 3021. M10. L9. PM. Printed in USA
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1 = Nozzle 2 = Blower tube 3 = Control handle 4 = Throttle trigger 5 = Setting lever 6 = Stop switch 5 7 = Pleated hose 1 6 8 = Harness 4 8 9 = Back plate 3 11 10 = Back padding 9 11 = Air filter 2
7 10 353BA031
12 = Rubber buffers 13 = Spark plug boot 14 = Muffler (with spark arresting screen) 15 = Carburetor adjusting screws 16 = Choke knob 12 17 = Starter grip 13 18 = Fuel filler cap
14 15 ✽ 16 = Serial number 18 12 17 353BA032 033 KN A
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1R]]OH $LUILOWHUFRYHU Aims and widens the spray or Cover the air filter element. airstream. 5XEEHUEXIIHUV %ORZHUWXEH Elements designed to reduce the Directs spray or airstream. transmission of vibrations created by the engine to the operators back. &RQWUROKDQGOH Handle on the flexible hose to hold 6SDUNSOXJWHUPLQDO and direct the tube in the required Connects the spark plug to the direction. ignition wire.
7KURWWOHWULJJHU 0XIIOHU Controls the speed of the engine. Attenuates exhaust noises and diverts exhaust gases away from 6HWWLQJOHYHU operator. Sets the trottle to various positions. &DUEXUHWRUDGMXVWHPHQWVFUHZV 6WRSVZLWFK For tuning carburetor. Stops engine. &KRNHNQRE 3OHDWHGKRVH Eases engine starting by enrichting For spraying, dusting or spreading mixture. in the desired direction. 6WDUWHUJULS +DUQHVV The grip of the pull starter, which is For carrying the unit. the device to start the engine.
%DFNSODWH )XHOILOOHUFDS Helps protect the back of the user. For closing the fuel tank.
%DFNSDGGLQJ Increases carrying comfort.
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6DIH XVH RI D EORZHU LQYROYHV :DUQLQJ :DUQLQJ The use of any blower may 1. the operator The STIHL BR 320, 400 is equipped be dangerous. It is important 2. the blower with an antivibration system (AV). The that you read, fully under- 3. the use of the blower . AV system is designed to reduce the stand and observe the follow- transmission of engine vibrations to the ing safety precautions and warnings. operator’s hands. An AV system is 7+( 23(5$725 recommended for those operators who Reread the owner‘s manual use blowers on a regular or sustained and the safety instructions 3K\VLFDO &RQGLWLRQ basis. periodically. You must be in good physical condition Antivibration systems do not guarantee and mental health and not under the that you will not sustain whitefinger :DUQLQJ influence of any substance (drugs, disease or carpal tunnel syndrome. Careless or improper use of the ma- alcohol, etc.) which might impair vision, Therefore, continual and regular users chine may cause serious injury. Have dexterity or judgment. Do not operate a should monitor closely the condition of your STIHL Dealer show you how to blower when you are fatigued . their hands and fingers. If any of the operate your blower. Observe all applica- Be alert - if you get tired while operating above symptoms appear, seek medical ble local safety regulations, standards your machine, take a break. Tiredness advice immediately. and ordinances. may result in loss of control. Working with any blower can be strenuous. If 3URSHU &ORWKLQJ :DUQLQJ you have any condition that might be Minors should never be allowed to use a aggravated by strenuous work, check Clothing must be sturdy and snug-fitting, blower : Bystanders, especially children, with your doctor before operating the but allow complete freedom of move- and animals should not be allowed in the machine. ment. Avoid loose-fitting jackets, flared area where a machine is in use. or cuffed pants, scarfs, unconfined long Never let the unit run unattended. hair or anything that could be drawn into Do not lend or rent your machine without :DUQLQJ the air intake. the owner‘s manual. Be sure that Prolonged use of a blower, (or other anyone using your unit understands the machines) exposing the operator to Wear overalls or long information contained in this manual. vibrations may produce whitefinger pants to protect your legs. Most of these safety precautions and disease (Raynaud‘s phenomenon) or Do not wear shorts. warnings apply to the use of all STIHL carpal tunnel syndrome. These con- Use of gloves when blowers. Different models may have ditions reduce the hand‘s ability to feel working with the blower different parts and controls. See the and regulate temperature, produce is recommended. appropriate section of your owner‘s numbness and burning sensations manual for a description of the controls and may cause nerve and circulation Good footing is most important. Wear and function of the parts of your damage and tissue necrosis. sturdy shoes with nonslip soles. machine.
%5 with the specific STIHL blower models :DUQLQJ are authorized. Although certain un- :DUQLQJ To reduce the risk of injury associated authorized attachment are useable for Gasoline is an extremely with the inhalation of dust, use a face the STIHL blower, their use may be flammable fuel. If spilled filter mask when using your blower in extremely dangerous. or ignited by a spark or dusty conditions. other ignition source, it can cause fire and :DUQLQJ serious burn injury or property damage. Proper eye protection is a must. Even 7+( 86( 2) 7+( %/2:(5 Use extreme caution when handling though the discharge is directed away gasoline or fuel mix. from the operator, ricochets and 7UDQVSRUW bounce-backs can occur during blower Always turn off the engine before taking Do not smoke or bring any fire or flame operations. the machine off your back and putting it near the fuel. down. When transporting your unit in a Never operate a blower vehicle, properly secure it to prevent unless wearing goggles or turnover, fuel spillage and damage to properly fitted safety glasses the machine. )XHOLQJ LQVWUXFWLRQV with adequate top and side protection which comply with :DUQLQJ Fuel your machine in well-ventilated ANSI Z 87.1 (or your appli- Before starting work, always inspect the areas, outdoors only. Always shut off the cable national standard). rubber buffers which connect the engine engine and allow it to cool before refuel- to the pack frame. If the buffers are torn ing. Relieve fuel tank pressure by Blower noise may damage your hearing. or damaged, they should be replaced by loosening fuel cap slowly. Never remove Wear sound barriers (ear plugs or ear your STIHL dealer. Failure of one or fuel filler cap while engine is running. mufflers) to protect your hearing. more buffers may cause the engine or Continual and regular users should have fuel tank to hit or rub against other parts, Select bare ground for fueling and move their hearing checked regulary. and may lead to serious injury from at least 10 feet (3 m) from the fueling increased vibrations or from fire as the spot before starting the engine. Wipe result of fuel leakage. off any spilled fuel before starting your 7+( %/2:(5 Adjust carrying harness to suit your size blower and check for leakage. before starting work. Always tighten fuel filler cap securely For illustrations and definitions of the after fueling. blower parts see the chapter on "Parts and Controls"! )XHOLQJ :DUQLQJ :DUQLQJ This STIHL unit uses an oil-gasoline To reduce the risk of serious injury from Never modify a blower in any way. Only mixture for fuel (see the chapter on burns, never attempt to refuel the unit attachments supplied by STIHL or "Fuel" of your owner‘s manual). until it has been completely removed expressly approved by STIHL for use from the operator.
%5 from thrown objects, insure that by- :RUNLQJ LQVWUXFWLRQV DQG LPSRUWDQW :DUQLQJ standers are at least 50 feet (15m) away DGMXVWPHQWV Check for fuel leakage while refueling during use. and during operation. If fuel or oil leakage is found, do not start or run the Stop the engine immediately if you are :DUQLQJ engine until leak is fixed and spilled fuel approached. Never operate your machine if it is has been wiped away. Take care not to damaged, improperly adjusted or not get fuel on your clothing. If this happens, The assistance of another person may completely and securely assembled. change your clothing immediately. be needed in placing the unit on your back after starting. In order to reduce the Always store gasoline in approved risk of injury to the assistant from thrown :DUQLQJ container. objects or from contact with fumes, the Start and operate your unit outdoors in a engine should be kept at idle speed dur- ventilated area. ing this brief period, and your assistant :DUQLQJ should not stand in the area of the outlet Keep the space behind the engine clear Unit vibrations can cause an improperly nozzle or exhaust. Otherwise, the unit at all times to allow for the escape of hot tightened fuel cap to loosen or come off should be started and operated without and toxic exhaust fumes. and spill quantities of fuel. In order to assistance. reduce risk of fuel spillage and fire, Operate your machine under good tighten fuel cap by hand with as much For specific starting instructions, see the visibility and daylight conditions only. force as possible. appropriate section of your owner‘s Work carefully. manual. Place the machine on firm The screw driver end of ground or other solid surface in an open the STIHL combination area. Maintain good balance and secure wrench or other similar footing. :RUNLQJ &RQGLWLRQV tool can be used as an aid in tightening slotted fuel When working with the blower, always caps. :DUQLQJ wear it on your back using the carrying When you pull the starter grip, don‘t harness. Wrap your fingers tightly wrap the starter rope around your hand. around the handle, keeping the control 6WDUWLQJ Do not allow the grip to snap back, but handle cradled between your thumb and guide the starter rope slowly back to forefinger. Keep your hand in this You should always inspect your unit permit the rope to rewind properly. position to have your machine under before starting it. Make sure the controls Failure to follow this procedure may control at all times. and safety devices are working properly. result in injury to hand or fingers and may damage the starter mechanism. Make sure your control handle and grip :DUQLQJ is in good condition and free of moisture, Your blower is a one-person machine. pitch, oil or grease. To reduce the risk of eye or other injury
%5 To reduce the risk of serious or fatal NIOSH / MSHA for the substance at injury from breathing toxic fumes, never issue. run the blower indoors or in poorly venti- lated locations. Ensure proper ventilation :DUQLQJ when working in trenches or other con- Dust with silica in its composition may fined areas. contain crystalline silica. Silica is a basic component of sand, quartz, brick, clay, granite and numerous other minerals :DUQLQJ and rocks, including masonry and con- Use of this product can generate dust, crete products. Repeated and / or sub- mists, and fumes containing chemicals stantial inhalation of airborne crystalline known to cause respiratory disease, silica can cause serious or fatal respira- cancer, birth defects, or other reproduc- tory disease, including silicosis. In addi- tive harm. If you are unfamiliar with the tion, the state of California and some risks associated with the particular dust, other authorities have listed respirable Ä mists or fumes at issue, consult your crystalline silica as a substance known employer, governmental agencies such to cause cancer. When encountering as OSHA and NIOSH and other sources such materials, always follow the re- 353BA038 L on hazardous materials. If the substance spiratory precautions mentioned above. being blown or vacuumed is a commer- cial substance, review the material :DUQLQJ :DUQLQJ safety data sheet for that substance and Breathing asbestos dust is dangerous To reduce the risk of personal injury, do / or consult the material manufacturer / and can cause severe or fatal injury, re- not direct air blast towards bystanders, supplier. The state of California and spiratory illness or cancer. The use and since the high pressure of the air flow some other authorities, for instance, disposal of asbestos containing products could injure eyes and could blow small have published lists of substances have been strictly regulated by OSHA objects at great speed. known to cause cancer, reproductive and the Environmental Protection toxicity, etc. Agency. Do not blow or disturb asbestos or asbestos containing products, such :DUQLQJ Control dust, mist and fumes at the as asbestos insulation. If you have any Your blower produces source where possible. In this regard reason to believe that you might be poisonous exhaust fumes use good work practices and follow the disturbing asbestos, immediately contact as soon as the combus- recommendations of OSHA / NIOSH your employer or a local OSHA tible engine is running. and occupational and trade associa- representative. These gases (e.g. carbon tions. When the inhalation of toxic dust, monoxide) may be color- mists and fumes cannot be eliminated, less and odorless. the operator and any bystanders should always wear a respirator approved by
%5 To reduce the risk of stumbling and loss :DUQLQJ of control, do not walk backward while Always shut off the engine before operating the machine. cleaning or servicing the unit or replacing parts.
Never insert any foreign object into the air intake of the machine or into the 2SHUDWLQJ ,QVWUXFWLRQV nozzle of the blower. It wil damage the fan wheel and may cause serious injury The blower may be used only for the to the operator or bystanders as a result operations described in your manual. of the object or broken parts being thrown out at high speed. 8VH RI %ORZHU Do not place the blower on the ground when operating at high speed, because The STIHL blower can be used for Ä small objects such as sand, gras, dust, clearing leaves and grass clippings from etc. may be pulled into the air intake and gardens and driveways and can also be damage the fan wheel. used for blow-sweeping paper, trash, 326BA003 L dust, light snow etc. from large areas, In the event of the machine catching fire sport stadiums or parks. 8VLQJ WKH 9DFXXP $WWDFKPHQW (for whatever reason) throw it off quickly (special accessory) by releasing the spring catches on both Gravel paths and walks, gravel-covered sides of the harness. flat roofs, ditches etc. can be blow-swept The vacuum is designed to pick up dry quickly. material such as leaves, grass, small In an emergency, you may slip out of the Other applications are blowing out pipes, twigs and bits of paper. harness and throw off the machine drains, gutters and your carport. quickly by first releasing the lap belt - on machines that are so equipped - :DUQLQJ and then lifting the tabs of the two sliding To reduce the risk of personal injury harness adjusters to slacken the shoul- from fire and explosion, never attempt to der straps. Try this procedure a number pick up hot or burning substances (e.g. of times before using the machine in smoldering ashes, glowing cigarettes) or order to become accustomed with it. combustible fluids (e.g. gasoline, paint Pay attention to the direction of the wind, thinners). i.e., do not work against the wind.
%5 0$,17(1$1&( 5(3$,5 $1' Check fuel filler cap for leaks at regular 6725,1* intervals. Use the specified spark plug :DUQLQJ 0DLQWHQDQFH UHSODFHPHQW RU UHSDLU and make sure it and the ignition lead In order to reduce the risk of fire, do not RI WKH HPLVVLRQ FRQWURO GHYLFHV DQG are always in good condition. modify or remove any part of the muffler V\VWHPV PD\ EH SHUIRUPHG E\ DQ\ or spark arrestor. QRQURDG HQJLQH UHSDLU HVWDEOLVKPHQW RU LQGLYLGXDO +RZHYHU LI \RX FODLP :DUQLQJ Tighten all nuts, bolts and screws except ZDUUDQW\ IRU D FRPSRQHQW ZKLFK KDV A worn or damaged muffler is a fire the carburetor adjustment screws after QRW EHHQ VHUYLFHG RU PDLQWDLQHG SUR hazard and may cause loss of hearing. each use. SHUO\ RU LI QRQDSSURYHG UHSODFHPHQW Check to see that the muffler is in good SDUWV ZHUH XVHG 67,+/ PD\ GHQ\ condition. The blower must not be Keep spark plug and wire connection ZDUUDQW\ operated if the muffler is not functioning tight and clean. The spark plug electrode properly or has been removed. gap should be checked with a feeler gauge at least every 50 operating hours Use only identical STIHL replacement Remember that the risk of forest fires is and reset if necessary. Fit a new spark parts for maintenance and repair. greater in hot weather. Use the spark plug if the electrodes are badly pitted. Use of parts manufactured by others arresting muffler supplied with the unit. For any maintenance please refer to the may cause serious or fatal injury. Never touch a hot muffler or burn will maintenance chart DQG WR WKH ZDUUDQW\ result. VWDWHPHQW near the end of this manual. Follow the maintenance and repair instructions in the appropriate section of Store blower in a dry, high or locked your owner’s manual. Refer to the location place and out of reach of maintenance chart at the end of this children. manual. Before storing for longer than a few :DUQLQJ days, always empty the fuel tank. Always stop the engine and make sure that the fan is stopped before doing any maintenance or repair work or cleaning the blower. Do not attempt any main- tenance or repair work not described in your owner’s manual. Have such work performed at your STIHL service shop only.
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Tools are stowed on the underside of Important: The throttle cable is already • Push the nozzle onto the end the blower (one combination wrench and connected and must not be kinked of blower tube and rotate it one carburetor screwdriver) during assembly. clockwise to engage the bayonet coupling. 0RXQWLQJWKHHOERZ • Secure throttle cable to the • Rotate the pleated hose counter- pleated hose with the retainer . clockwise as far as the stop and • Line up the stops on the elbow leave it in that position. and fan housing stub . 0RXQWLQJWKHEORZHUWXEH • Turn the control handle to the • Push the elbow into the stub horizontal position. as far as it will go • Push the blower tube into the • Now rotate the complete blower • Fit the nut into the hexagon pleated hose . tube until the nozzle points in the recess on the stub. • Push blower tube onto the end same direction as the control • Insert the screw in the nut from the of tube and rotate it clockwise to handle. other side and tighten moderately - engage the bayonet coupling. • Tighten down the clamp screw . the elbow must still turn.
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• Pull the ends of the straps downward to tighten the harness. 11 353BA004
$GMXVWLQJWKHFRQWUROKDQGOH The BR 320/400 blower is designed for single-handed operation. It is carried as • Put the unit on your back. a backpack and operated with the right • Release the clamp screw . hand on the control handle. • Slide the control handle along the pleated hose to the most The powerful ground-level airstream comfortable position. can be aimed highly accurately and • Retighten the clamp screw . effectively. It enables the operator to quickly blow-sweep large areas.
• Lift the tabs of the two sliding The blower can be used for clearing adjusters to slacken the harness leaves, grass, paper, dust and light straps. snow in gardens, sports stadiums, • Adjust the straps so that the back- parks, driveways and parking lots. It is plate is held firmly and comfortably also suitable for drying cars and clearing against your back. forest paths.
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8VLQJWKHYDFXXPDWWDFKPHQW Recommended working techniques to This engine is certified to operate on VSHFLDODFFHVVRU\ minimize noise: unleaded gasoline and with the mix ratio 50:1. The vacuum attachment is used to pick • Operate power equipment only at up leaves, grass and other materials. reasonable hours - not early in the Your two-stroke engine requires a Even big leaves, pieces of cardboard morning, late at night or during the mixture of brand-name gasoline and and bark fit through the large diameter noon-break when people might be quality two-stroke engine oil with the suction tube. disturbed. Comply with times listed classification TC. in local ordinances. Usual recom- Take particular care when vacuuming mendations are 9:00 a.m. to 12:00 Use regular branded unleaded gasoline GDPS leaves as they may clog the fan. a.m. and 03:00 p.m. to 5:00 p.m. on with a minimum octane rating of workdays for professionals. Special 90 RON (U.S.A./Canada: pump octane Never pick up hot or burning substances, considerations should be given to min. 89!). If the octane number of the e.g. smoldering ashes, glowing neighbours on weekends. regular grade gasoline in your area is cigarettes. Never vacuum close to a fire lower use premium unleaded fuel. or other naked flames. • Fewer engines mean less noise; Fuel with a lower octane rating may therefore use only one piece of result in preignition (causing "pinging") :RUNLQJWHFKQLTXHV power equipment at a time, when which is accompanied by an increase in possible. engine temperature. This, in turn, To minimize blowing time, use rakes increases the risk of the piston seizure and brooms to loosen debris before • Operate power blowers at the and damage to the engine. blowing. lowest possible throttle speed to do Recommended working techniques to the job. The chemical composition of the fuel is minimize airborne debris and pollution: also important. Some fuel additives not • Check your equipment before only detrimentally affect elastomers • In dusty conditions, slightly dampen operation, especially the muffler, air (carburetor diaphragms, oil seals, fuel surfaces. intakes and air filters. lines etc.), but magnesium castings as • Use the full blower nozzle exten- well. This could cause running problems sion so the airstream can work Conserve water by using power blowers or even damage the engine. For this close to the ground. instead of hoses for those lawn and reason it is essential that you use only • Do not direct debris at subjects garden applications where a blower can name branded fuels! such as open windows or freshly- be properly used, such as cleaning washed cars. patios or porches. Use only STIHL two-stroke engine oil or • After using blowers, clean up. Do equivalent branded two-stroke air- not blow debris onto neighbouring cooled engine oils with the classification properties. TC for mixing.
%5 %5 at authorized disposallocations. 6.4 Dispose empty mixing-oil canistersonly 512.8 21/2 USfl.oz oils) TC branded equivalent 2.61 Oil (STIHL 50:1or US gal. line Gaso- gasoline. add then and first, canister only.When mixing, pour oil intothe fuel-canisters safety approved in Store storage. of 3months exceed to not work, Only mix sufficient fuel for a few days )XHOPL[DJHV time. to time from cleaned be should stored is mix fuel which in canister the and tank fuel The mixture. the into getting closedorder in to avoid any moisture tightly kept be should canister The vapour. fuel inhaling avoid Avoid direct contact with the skinand Take care when handlinggasoline. oils! mix cooled) water (two-stroke TCW or BIA use not Do engines. STIHL in use for formulated specially is it since oil engine two-stroke 50:1 STIHL We recommend
as securely as possible by hand. cap fuel tighten fueling, After build-up in the tank to release slowly. cap carefully so as to allow any pressure vaporandfumes, remove the fuelfiller other personal injury from escaping gas orderInto reduce the risk ofburns or the canister before fueling your machine. in mixture the shake thoroughly Always dirt falls intothe tank. and the area around itto ensure thatno Beforefueling, clean the filler cap )XHOLQJ :DUQLQJ/ :DUQLQJ/
353BA008 run engine until carburetor is dry. and tank fuel the clean and drain period, a long for machine your storing Before Change the fuel pick up body every year.
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Observe safety precautions - see chap- • f the engine is FROG, turn the • Put the unit on the ground. ter "Safety Precautions" in this manual. choke knob to N Check that bystanders are well clear of the general work area and • Slide the stop switch to • If the engine is ZDUP, turn the the nozzle. • Move the setting lever to choke knob to H • Make sure you have a firm footing: the center position - Also use this position if the engine Hold the unit with your left hand on VWDUWLQJWKURWWOHSRVLWLRQ. has ben running but is still cold. the housing and put one foot against the base plate to prevent it 1RWH slipping. The setting lever can be used to select • Pull the starter grip slowly with your any throttle opening between idle speed right hand until you feel it engage (lower stop) and full throttle (upper stop). and then give it a brisk strong pull. Set the lever to idle speed before Do not pull the starter rope out shutting down the engine. more than 75cm (30") as it might otherwise break. • Do not let the starter grip snap back. • Guide it slowly back into the housing so that the starter rope can rewind properly.
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1 If you did not turn the choke knob to H quickly enough after the engine began to fire, the combustion
chamber has flooded. 353BA015 353BA017 • Remove spark plug boot. • Unscrew and dry off the :KHQWKHHQJLQHEHJLQVWRILUH $VVRRQDVHQJLQHUXQV spark plug. • Set the stop switch to . • If engine is FROG: • Move the setting lever to its • Open the throttle fully. Turn choke toH lower end position so that engine • Pull the starter rope several times and continue cranking until engine settles down to idle speed. to clear the combustion chamber. runs. 7RVWRSWKHHQJLQH • Refit the spark plug and connect • If engine is ZDUP: • Slide the stop switch to the spark plug boot. Continue cranking until engine runs. • Set stop switch to • Turn choke knob to H $WYHU\ORZRXWVLGHWHPSHUDWXUHV even if the engine is cold. $OORZHQJLQHWRZDUPXS • Now start the engine.
• As soon as engine runs: )XHOWDQNUXQXQWLOGU\DQGWKHQ • Move the setting lever to its lower UHIXHOHG stop - the engine returns to idling speed. • Pull starter rope several times to • Open throttle slightly - warm up prime the fuel pump and fuel line. engine for a short period. • Now start the engine.
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1 Exaust emissions are controlled by the design of the fundamental engine para- meters and components (e.g. carbu- ration, ignition, timing and valve or part timing) without the addition of any major hardware. 353BA043 KN 353BA000 KN
Dirty air filters reduce engine power, • Remove the prefilter (if fitted) The carburetor comes with a standard increase fuel consumption and make from the filter element . setting. starting more difficult. • Wash the prefilter in fresh, non- flammable cleaning solution (e.g. This is the optimum setting to ensure ,IWKHUHLVDQRWLFHDEOHORVVRIIHQJLQH warm soapy water) and then dry. your machine will operate reliably with SRZHU Always replace a damaged filter the lowest possible emission under most element. operating conditions. • Turn choke knob to J • Take out the filter element - if it • Release the screws and pull off is dirty, fit a new one. the filter cover . • Fit the felt element in the filter 6WDQGDUGVHWWLQJ • Clean away loose dirt from around base . the filter. • Slide the prefilter over the filter If it is necessary to readjust the car- element. buretor from scratch, first carry out the • Fit the filter cover and tighten down standard setting. firmly. Turn + high speed adjusting screw and / low speed adjusting screw counterclockwise (richer) or as far as stop.
%5 If you don‘t have a tachometer, do not &RUUHFWLRQVWRKLJKVSHHGDGMXVWLQJ set the highspeed adjusting screw any VFUHZ leaner by turning it beyond the standard setting. The high speed adjusting screw + L alters the power output and maximum off-load engine speed. 2SHUDWLRQDWKLJKDOWLWXGH If you turn this screw too far clock- PRXQWDLQV wise and make the setting too lean, there is a risk of engine damage. Slight correction PD\ be necessary.
Use a WDFKRPHWHU to set the high speed adjusting screw + to obtain the highest LA possible engine speed. From that position, turn the high speed adjusting screw + 1/8 counterclockwise (richer) or as far as stop. Avoid risk of engine damage which can be caused by lack of lubrication and overheating - 353BA023
• Check air filter and clean it if 6HWWLQJLGOHVSHHG necessary. It is usually necessary to change • Set idle speed correctly. the setting of the idle speed • Warm up the engine. adjusting screw /$ after every correction to the low Turn the high speed adjusting speed adjusting screw / . screw + and low speed adjusting screw / clockwise (leaner) at (QJLQHVWRSVZKLOHLGOLQJ higher altitudes. Turn the idle speed adjusting screw /$ clockwise until Turn the screws very slowly and the engine runs smoothly. carefully - slight changes have a noticeable effect on the engine’s running behavior. (UUDWLFLGOLQJEHKDYLRUSRRU DFFHOHUDWLRQ Idle setting is too lean. Turn the low speed adjusting screw / counterclockwise until engine runs and accelerates smoothly.
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Wrong fuel mix (too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions (mostly 1 at part throttle etc.) affect the condition of the spark plug. These factors cause deposits to form on the insulator nose which may result in trouble in operation.
If engine is down on power, difficult to 000BA036 TR start or runs poorly at idling speed, first check the spark plug. • Fit a new spark plug after approx. 100 operating hours - • Remove spark plug - or earlier if the electrodes are see chapter “Starting”: badly eroded. • Clean dirty spark plug. • Check electrode gap - it should be 0.5mm/0.02" $ - :DUQLQJ/ readjust if necessary. To reduce the risk of fire and burn injury, • Use only resistor type spark plugs use only spark plugs authorized by of the approved range. STIHL (see “Specifications”). Always press spark plug boot snugly onto Rectify problems which have caused spark plug terminal of the proper fouling of spark plug: size. (Note: If terminal has detachable Incorrect carburetor setting, too much oil SAE adapter nut, it must be attached.) in fuel mix, dirty air filter, A loose connection between spark plug unfavorable running conditions, e.g. terminal and ignition wire connector in operating at part load. the boot may create arcing that could ignite combustible fumes and cause a fire.
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If the engine is down on power, check • Squeeze the ends of the clip • Place housing in position. the spark arresting screen in the muffler. together and lift the clip away. • Tighten down housing screws. • Take the spark arresting screw • Fit the spark plug boot . out of the muffler. • Fit the starter cover . :DUQLQJ • Clean the spark arresting screen. • Tighten down the starter cover Wait until engine has cooled down • If screen is damaged or heavily screws . completely before performing the carbonized, fit a new one. following operations. • Install the spark arresting screen . • Take out starter cover mounting • Fit the clip . screws . • Remove the starter cover . • Pull off the spark plug boot . • Take out the housing mounting screws . • Remove the housing .
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1 353BA027 353BA041 KN
• Remove the three screws . • Remove the spring clip . • Ease the cap out of the starter • Lift the starter cover off • Remove the rope rotor with grip. the engine. washer and pawl . • Remove remaining rope from the rotor and grip. • Tie a simple overhand knot in the end of the new starter rope - 1113 195 8200 - and then thread the rope through the top of the grip and the rope bush . • Refit the cap in the grip.
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• Lubricate the new spring with a few drops of non-resinous oil - • Remove the rope rotor - see "Replacing Starter Rope" - • Remove parts of old spring. 353BA036 T
• Thread the rope through the rotor • Coat rope rotor bearing bore with and secure it with a simple over- non-resinous oil. hand knot. • Slide rotor onto starter post - turn it back and forth so that anchor loop of rewind spring engages - • Refit the pawls in the rotor - • Fit the washer on the starter post • Use screwdriver or suitable pliers to install spring clip on starter post and over the pawl pegs - the spring clip must point in clockwise direction - see illustration.
%5 • When starter rope is fully extended it must be possible to rotate the rotor at least another half turn. If this is not the possible, the spring is over- tensioned and could break Take off one turn of the rope. • Fit the fan housing on the crankcase. • Tighten down the screws firmly. • Set the Master Control lever to 353BA029 353BA030
• Fit new spring housing - bottom 7HQVLRQLQJUHZLQGVSULQJ plate must face downward. • Make a loop in the unwound starter Engage outer spring loop over the rope and use it to turn the rope lug. rotor six full revolutions in the • Refit the rope rotor. direction of the arrow Go to "Tensioning rewind spring". • Hold the rotor steady - straighten the twisted rope - • If the spring has popped out and • Release the rotor - uncoiled: • Let go of rope slowly so that it winds Refit it in the counterclockwise onto the rotor. direction - start outside and work The starter grip must sit firmly in the inward. rope guide bush. If the grip droops to one side: Increase spring tension by one additional turn.
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'XULQJEUHDNLQSHULRG For periods of about 3 months or longer:
A factory new machine should not be • Remove the blower tube and run at high revs (full throttle off load) for nozzle. the first three tank fillings. This avoids • Drain and clean the fuel tank. unnecessary high loads during the • Run engine until carburetor is dry - break-in period. this helps prevent the carburetor diaphragms sticking together. As all moving parts have to bed in • Thoroughly clean the machine - during the break-in period, the pay special attention to the frictional resistances in the engine cylinder fins and air filter. are greater during this period. • Store the machine in a dry, high The engine develops its maximum or locked location - out of the power after about 5 to 15 tank fillings. reach of children and other unauthorized persons. 'XULQJRSHUDWLRQ
After a long period of full-throttle operation, allow engine to run for a while at idle speed so that the heat in the engine can be dissipated by flow of cooling air. This protects engine- mounted components (ignition, carburetor) from thermal overload.
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Storing for a short period: Wait for engine to cool down. To avoid condensation, fill the fuell tank and keep the unit in a dry place until you need it again.
Storing for an long period: see chapter "Storing the Machine".
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Please note that the following maintenance intervals apply for normal operating conditions only. If your daily working time is longer than normal or operating conditions are difficult (very dusty work area) shorten the specified intervals accordingly. before starting work after finishiing work or daily after each refueling stop weekly monthly if faulty if damaged as required see page: Visual inspection (condition, leaks) xx Complete machine Clean x Control handle Check operation x x 14-15 Clean x16 Air filter Replace x16 Check x 12-13 Filter in fuel tank Replace felt and strainer x 12-13 Fuel tank Clean x12 Check idle adjustment Carburetor x x 16-17 Idle setting x 16-17 Spark plug Readjust electrode gap x18 Cylinder fins Clean x Inspect x Spark arresting screen in muffler Clean or replace x All accessible screws and nuts (not adjusting screws) Retighten x
The user of this unit should carry out :DUUDQW\FODLPVIROORZLQJUHSDLUV Original STIHL parts can be identified only the maintenance operations FDQEHDFFHSWHGRQO\LIWKHUHSDLU by the STlHL part number, the described in this manual. Other repair KDVEHHQSHUIRUPHGE\DQDXWKRUL]HG T logo and the STIHL parts work may be performed only by an 67,+/6HUYLFHGHDOHUXVLQJRULJLQDO symbol The symbol may appear authorized STIHL Service dealer. 67,+/VSDUHSDUWV alone on small parts.
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Model BR 320 BR 320 L BR 400
STIHL single cylinder two-stroke engine - Displacement 44.9 cm3 (2.74 cu.in) 44.9 cm3 (2.74 cu.in) 56.5 cm3 (3.45 cu.in) - Bore 41 mm (1.61 in) 41 mm (1.61 in) 46 mm (1.81 in) - Stroke 34 mm (1.34 in) 34 mm (1.34 in) 34 mm (1.34 in) - Engine power 2.0 kW (2.7 bhp) 1.4 kW (1.9 bhp) 2.5 kW (3.4 bhp) Air flow rate (with blower tube and nozzle) 740 m3/h (435 cfm) 650 m3/h (383 cfm) 810 m3/h (476 cfm)
Air velocity (with blower tube and nozzle) 72 m/s (236 ft/s) 64 m/s (210 ft/s) 80 m/s (252 ft/s)
Max. air flow rate 1000 m3/h (512 cfm) 870 m3/h (588 cfm) 1060 m3/h (624 cfm)
Weight (dry) 8.9 kg (19.6 lb) 9.0 kg (19.9 lb) 8.9 kg (19.6 lb)
Bystanders noise per ANSI B 175.2-1990 73 dB(A) 70 dB(A) 75 dB(A)
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Type: Electronic Height: 445 mm (17.5 in) magneto ignition Width: 480 mm (18.9 in) Spark plug Bosch WSR 6 F Depth: 280 mm (11.0 in) (suppressed): or NGK BPMR 7 A; Heat range 200 6SHFLDO$FFHVVRULHV Electrode gap: 0.5 mm (0.02 in) Spark plug thread: M 14 x 1,25; Blower to Mistblower conversion kit, 9.5 mm (0.37 in) vacuum attachment, hip belt, back rest long padding
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Carburetor: All position diaphragm carburetor with integral fuel pump Air filter: Paper filter element Fuel tank capacity: 1.5 l (3.2 US pt) Fuel mix: See chapter "Fuel"
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%5 :DUUDQW\3HULRG :DUUDQW\:RUN 0DLQWHQDQFH5HTXLUHPHQWV The warranty periods will begin on the STIHL Incorporated shall remedy The maintenance instructions in this date the utility equipment engine is war-ranty defects at any authorized manual are based on the application of purchased by the initial purchaser and STIHL servicing dealer or warranty the recommended 2-stroke fuel-oil you have signed and sent back the station. Any such work shall be free of mixture (see also instruction "Fuel"). warranty card to STIHL. If any emission charge to the owner if it is determined Deviations from this recommendation related part on your engine is defective, that a warranted part is defective. Any regarding quality and mixing ratio of fuel the part will be replaced by STIHL manufacturer-approved or equivalent and oil may require shorter maintenance Incorporated at no cost to the owner. replacement part may be used for any intervals. Any warranted part which is not warranty mainten-ance or repairs on scheduled for replacement as required emission-related parts and must be maintenance, or which is scheduled only provided without charge to the owner. /LPLWDWLRQV for regular inspection to the effect of STIHL Incorporated is liable for damages This Emission Control Systems "repair or replace as necessary" will be to other engine components caused by Warranty shall not cover any of the warranted for the warranty period. the failure of a warranted part still under following: Any warranted part which is scheduled warranty. for replacement as required mainten- - repair or replacement required ance will be warranted for the period of The California Air Resources Board’s because of misuse, neglect or lack of time up to the first scheduled replace- Emission Warranty Parts List specifically required maintenance, ment point for that part. defines the emission-related warranted parts. These warranted parts are: - repairs improperly performed or replacements not conforming to 'LDJQRVLV Carburetor STIHL Incorporated specifications that You, as the owner, shall not be charged Choke (Cold start enrichment system) adversely affect performance and/or for diagnostic labor which leads to the Intake manifold durability, and alterations or determination that a warranted part is Air filter modifications not recommended or defective. However, if you claim warranty Spark plug approved in writing by STIHL for a component and the machine is Magneto or electronic ignition system Incorporated, tested as non-defective, STIHL (ignition module) Incorporated will charge you for the cost Catalytic converter (if applicable) and of the emission test. Fasteners Mechanical diagnostic work will be - replacement of parts and other performed at an authorized STIHL services and adjustments necessary servicing dealer. Emission test may be :KHUHWRPDNHDFODLPIRU:DUUDQW\ for required maintenance at and after performed either at STIHL Incorporated 6HUYLFH the first scheduled replacement point. or at any independent test laboratory. Bring the product to any authorized STIHL servicing dealer and present the signed warranty card.
%5 & WARNING!
The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.
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