STIHL FS BB, 7DB Instruction Manual Owner's Manual Assembling Safety Precautions Operating Instructions Maintenance
Contents Parts and Controls - Version with Bike Handle - Version with Loop Handle - Version with Loop Handle and Standoff Lever Safety Precautions and Working Techniques Selecting the Cutting Tool Mounting the Bike Handle Mounting loop Handle with Standoff Lever Mounting the Loop Handle - Version A - Version B Mounting the Deflector - Fitting stop Mounting the Cutting Tools - STIHL Supercut 2-2 - STIHL Supercut 20-2 - STIHL Autocut 25-2 - STIHL Autocut 30-2 - STIHL Autocut 24-2 - STIHL Polymatic 30-2 - STI
Parts and Controls Version with Bike Handle 2 9 1 1= 2= 3= 4= 5= 6= 7= 8= 9= 10 = 11 = 12 = Handle support Throttle trigger Slide control Throttle trigger interlock Bike handle Throttle cable retainer Carrying loop Throttle cable / stop switch wire Spark plug terminal Air filter cover Choke lever Machine support 13 = 14 = 15 = 16 = 17 = Fuel tank Fuel filler cap Starter grip Carburetor adjusting screws Muffler 18 = Deflector (for all cutting tools, without skirt) 19 = Metal cutting Itool (cutting bl
Definitions 1. 8. Handle support. Connects the drive shaft to the handle bars. Throttle trigger. Controls the speed of the engine. 3. Slide control. Starting throttle lock and stop switch. Keeps the throttle partially open during starting and switches the engine's ignition off and stops the engine. 16. Carburetor adjusting screws. For tuning carburetor. 17. Muffler. 9. 2. Throttle cable/stop switch wire. Connect operator's control grip to the powerhead. Spark plug terminal.
Version with Loop Handle and loop handle with standoff lever 1 = Loop handle 2 = Standoff lever 3 = Carrying loop (not all markets) 4 = Slide control 5 = Throttle trigger 6 = Throttle trigger interlock 7 = Throttle cable / stop switch wire 8 = Spark plug terminal 9 = Air filter cover 10= Choke lever 11 = Machine support 8 12 = 13 = 14 = 15 = 16 = 17 = Deflector (for mowing heads) 18 = Line limiting blade 19 = Cutting tool 17 19 4 Fuel tank Fuel filler cap Starter grip Carburetor adjusting screws Muff
Definitions 1. Loop handle. For easy control of machine during cutting work. 8. 9. Spark plug terminal. Connects the spark plug to the ignition wire. 16. Muffler. Attenuates exhaust noises and diverts exhaust gases away from operator. Air filter cover. Covers the air filter element. 17. Deflector. 2. 3. 4. 5. 6. Standoff lever. Helps keep unit at a safe distance from operator's feet and legs. 10. Choke lever. Carrying loop. The device to connect the brushcutter to the harness. 11.
Safety Precautions and Working Techniques anlgl Because a brushcutter is , a high-speed, fast-cutting • power tool, special safety precautions must be obseNed to reduce the risk of personal injury. & It is important that you read, fully understand and obseNe the following safety precautions and warnings. Read the owner's manual and the safety instructions periodically. Careless or improper use of any brushcutter may cause serious or fatal injury.
To reduce the risk of injury to your face STIHL recommends that you also wear a face shield or face screen over your goggles or safety glasses. WarnIng! Brushcutter noise may damage your hearing. Wear sound barriers (ear plugs or ear mufflers) to protect your hearing. Continual and regular users should have their hearing checked regularly. THE OPERATOR! Physical Condition You must be in good physical condition and mental health and not under the influence of any substance (drugs, alcohol, etc.
THE BRUSHCUTIER For illustrations and definitions of the brushcutter parts see the chapter on "Parts and Controls"! Warning' Never modify a brushcutter in any way. Only attachments supplied by STIHL or expressly approved by STIHL for use with the specific STIHL brushcutter models are authorized. Although certain unauthorized attachments are useable for the STIHL brushcutter, their use may, in fact, be extremely dangerous.
Fueling Instructions Fuel your brushcutter in well-ventilated areas, outdoors. possible. The screw driver end of the STIHL combination wrench or other similar tool can be used as an aid in tightening slotted fuel caps. rntng l Gasoline vapor pressure may build up inside the gas tank of a two cycle engine depending on the fuel used, the weather condition, and the venting system of the tank.
Before cutting, inspect the area for stones, glass, pieces of metal, trash or other solid objects. The cutting attachment could throw objects of this kind. ~. To reduce the risk of injury from thrown objects and blade contact, never operate a brushcutter without a properly mounted deflector. Keep the skirt on the deflectors adjusted properly at all times (see chapter on mounting the various cutting tools of your owner's manual). Do not overreach. Keep proper footing and balance at all times. .
W mmg! When using rigid blades, avoid cutting close to fences, sides of buildings, tree trunks, stones or other such objects that could cause the brushcutter to kick out or could cause damage to the blade. STIHL recommends use of the nylon line heads or Polycut head for such jobs. In addition, be alert to an increased possibility of ricochets in such situations. Do not operate using the starting throttle lock as you do not have control of the engine speed.
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Using the brush knife Warnlngl Warning! When fitted to the brushcutter, the brush knife is suitable for applications ranging from cutting matted grass to clearing weeds, wild growth and scrub. Improper use of a brush knife may cause it to crack, chip or shatter. Thrown parts may seriously injure the operator or bystanders. To reduce the risk of personal injury it is essential to take the following precautions: Avoid contact with hard or solid foreign objects such as stones, rocks or pieces of metal.
Warning' In order to reduce the risk of injury from thrown objects or from operator contact with the cutting tool, be sure to remount the standard deflector for all other u·ses. Before starting the cut, accelerate the engine up to full throttle. Perform cut with uniform pressure. STIHL recommends that the circular saw blade be applied to the right of the tree, using the non-shaded area of the blade.
MAINTENANCE, REPAIR AND STORING Use only identical STIHL replacement parts for maintenance and repair. Use of parts manufactured by others may cause serious or fatal injury. Follow the maintenance and repair instructions in the appropriate section of your owner's manual. Please refer to the maintenance chart at the last pages of this manual.
Check condition of culling tool at regular short intervals. If behavior of tool changes, check it immediately for tightness or any signs of cracks in particular. Replace damaged or dull cUlling tools immediately, even if they have only superficial cracks. If the blade loosens after being properly tightened, the retaining nut may be worn or damaged and should be replaced. If the blade continues to loosen, see your STIHL dealer.
Selecting the Cutting Tool 1 2 3 4 5 6 7 8 9 Cutting tools: STIHL Supercut 20-1 mowing head (FS 74 only) STIHL Supercut 20-2 mowing head STIHL Autocut 20-2 mowing head (FS 74 only) STIHL Autocut 24-2 mowing head STIHL Autocut 25-2 mowing head STIHL Autocut 30-2 mowing head STIHL Polymatic 30-2 mowing head STIHL Polycut 20-3 mowing head STIHL Fixed Line head 10 11 12 Grass Cutting blade 230-4 Grass Cutting blade 230-8 Brush knife 250 13 Circular saw blade 200 (scratcher tooth) Circular saw blade 200 (c
Deflectors Cutting tools 2 0 15 ~---' 4~ 3 ~ 21 - 6 5 Carrying straps Handles 20~ ~ 22 24 16 8 7 23 ~l t-J 'C( ~..... (e' - 9 11 10 21 ) -:1 .~ -- \ 18 --..../J 12 23 A 19 14 13 0 (:) ~ = 23 V ~ V V 25 ~I 22 ....
Mounting the Bike Handle , 3 4 I I 3 iI ~ I 5 ~ 8 § 6 J The handle support (2) is mounted on the drive tube (1). • Take out the 4 screws (3) remove the clamp (4). • Place the bike handle (5) in the and position the clamp (4) on the handle support. • Line up holes in clamp and handle support. • Insert the screws as far as stop. • Line up the bike handle. • Tighten the screws firmly. 11 12 .
Mounting Loop Handle with Standoff Lever ~ -A- 3 3 [] [] oJ -l ( 4 ,......, 1 ~ 0 ~. ~ 02 ~ 1 -- 1 1 I I r lQJ c.2.. I I I lQj ~ I~ 3 • 4 I I Mount the loop handle (1) with standoff lever 20 cm/8" (A) forward of the control handle (2). • <:¢fIlII! 41 3 Insert square nuts (3) in the standoff lever (4) line up the holes. On FS 108 • • • • • Place the clamp (5) in the loop handle (1) and position them both against the drive tube (6).
Mounting the Loop Handle Version A 4 At;) A 1 o o On FS 88 • • • • • • 22 Place the clamp (5) in the loop handle (1). PlaE:e packing sleeve (7) on the drive tube (6). Fit the clamp (8) and place standoff lever (4) in position line up the holes. Insert screws (9) in holes and screw them into standoff lever fingertight. Align the loop handle. Tighten the screws firmly. • Mount the loop handle (1) 20 cm/8" (A) forward of the control handle (2). On FS 108 • • • ~.
Mounting the Loop Handle Version B ~0 3 4 5 ~6 8 ([JJ ([JJ 8 On FS 88 • • • • • • Place the clamp (3) in the loop handle (1). Place packing sleeve (5) on the drive tube (4). Fit the clamp (6) line up the holes. Insert screws (7) in holes and screw on the nuts (8) fingertight. Align the loop handle. Lock the nuts and tighten the screws firmly. • Mount the loop handle (1) 20 cm/8" (A) forward of the control handle (2). • Place the clamp (3) in the loop handle (1).
Mounting the Deflector 1 3~ 4 Mounting the deflector Fitting skirt and blade • • Place either deflector (1) for all cutting tools or deflector (2) for mowing heads on the gearhead flange. • Fit the plate (3) and line it up. • Insert M 5 x 18 screws and tighten down securely. • • 24 Slide the lower guide slot of the skirt (4) over the deflector (1) it must snap into position. Push blade (5) into the upper gUide on the skirt and line it up with the first hole.
Mounting the Cutting Tools [ \ f \ 1 • 8 Lay your brushcutter on its back with the gear head facing up. Removing cutting tool mounting hardware • • Blocking the output shaft • • \ t • • 6 Insert stop pin (1) in the bore (2) at the side of the gear head as far as stop - apply slight pressure. Rotate output shaft until the stop pin slips into position and blocks the shaft. Position combination wrench (3) on the mounting nut (4). Release and unscrew the nut clockwise (left-hand thread).
STIHL Supercut 2-2 STIHL Supercut 20-2 • • • • Lay your brushcutter on its back with the gear head facing up. Screw mowing head counterclockwise onto the output shaft (1) as far as it will go. Block the output shaft. Tighten down the mowing head securely. Important! Remove the stop pin. Removing mowing head • • Adjusting nylon line • • Keep instruction sheet for mowing head in a safe place. Block the output shaft. Unscrew mowing head clockwise.
2 c;- 1 3 "c 4 I~ Adjusting nylon line • • Hold the rotating mowing head horizontal above the ground tap it on the ground about 3cm/1 1/4" fresh line is advanced - blade on deflector trims surplus line to the correct length avoid tapping head more than once. Line feed operates only if both lines still have a minimum length of 2.Scm/1". • Fit new nylon line as described in instructions supplied with mowing head.
~4 -= 2 1 STIHL Polycut 40-3 • • • • •• Lay your brushcutter on its back with the gear head facing up. Remove ring (1) from the mowing head. Position the head on the thrust plate (2). Slip the thrust washer (3) over the output shaft (4). Block the output shaft. Screw mounting nut (5) counterclockwise on to the output shaft and tighten it down firmly. Important! Releasing mounting nut • STIHL Fixed Line Head Block the output shaft and unscrew the mounting nut clockwise.
Releasing mounting nut • • Block the output shaft. Unscrew the mounting nut clock wise. If the mounting nut becomes slack due to frequent loosening and retightening, fit a new one. Grass cutting blade 230 Brush knife 250 • Note: Remove skirt and blade from deflector before mounting these cutting tools. • • • • t Fitting nylon line l • • • Refer to instruction sheet supplied with fixed line head. Lay your brushcutter on its back with the gear head facing up.
@8 \6 [ ::==::..., 3 5 7 4 Circular saw blade 200 (chisel and scratcher tooth) Fit the appropriate stop before mounting circular saw blade. Mounting circular saw blade Releasing mounting nut • • • Fitting the stop see chapter "Mounting the Deflector". • • • 30 Lay your brushcutter on its back with the gear head facing up. Position saw blade (3) on the thrust plate (4) teeth must point in clockwise direction. Slip the thrust washer (5) and rider plate (6) over the drive shaft (7).
Fuel Your two-stroke engine requires a mixture of brand-name gasoline and quality two-stroke engine oil with the classification Te. Use regular branded unleaded gasoline with a minimum octane number of 90 ROZ (U.S.A./Canada: pump octane min. 89!). If the octane number of the regular grade gasoline in your area is lower us5=l premium unleaded fuel. Fuel with a lower octane number may result in preignition (causing pinging") which is accompanied by an increase in engine temperature.
Fitting the Harness Fueling Before fueling, clean the filler cap and the area around it to ensure that no dirt falls into the tank. Always thoroughly shake the mixture in the canister before fueling your machine. Warning! In order to reduce the risk of bums or other personal injury from escaping gas vapor and fumes, remove the fuel filler cap carefully so as to allow any pressure build-up in the tank to release slowly. Warning' After fueling, tighten fuel cap as securely as possible by hand.
Full harness Balancing the brushcutter • • • Put on the full harness (2). Adjust length until the spring hook (3) rests against your right hip. • Use of the carrying strap is described in chapters "Safety Precautions" and "Selecting the Cutting Tool". • • Attach the spring hook (3) to the clamp (4) on the drive shaft slacken the screw (5). Slide the clamp up or down the drive shaft. Tighten the screw moderately.
Starting 1 • • • • Observe safety precautions - see section "Safety Precautions" in this manual. Hold down the throttle trigger interlock (1) and squeeze the throttle trigger (2). Move the slide control (3) to START position. Now release the throttle trigger, slide control and trigger interlock in that order = This is the starting-throttle position. 34 If engine is cold: Set the choke lever (4) to • .L If engine is warm: Set the choke lever (4) to ...
~oo~ (( \\3)) 2 • Pull the starter grip slowly with your right hand until you feel it engage and then give it a brisk strong pull. Do not pull out starter rope more than 70cm (27") - it might break. Do not let the starter grip snap back - guide it slowly into the housing so that the starter rope can rewind properly. When engine begins to fire: As soon as warm engine runs: If engine is cold: Set choke lever (4) to and continue cranking until engine runs.
To shut down engine: • Move slide control (3) to STOP. At very low outside temperatures: Allow engine to warm up As soon as engine runs: • Blip the throttle triggerthe slide control (3) moves to the run position I, and the engine returns to idling speed. • Open throttle slightly warm up engine for short period. 36 If the engine doesn't start: • If you did not move the choke lever to.L quickly enough after the engine began to fire, the combustion chamber is flooded.
Adjusting Carburetor t I { FS88 I L ~~ I L-!@ L.... ~ FS 108 I { I r rB I / FS 88 I L /-1=1 I R IfF ~~ ~l~ ~LA FS 108 I I I H L ~ 1~! , I JJ ~~ LD ~I-R~The carburetor has been adjusted for optimum performance under the barometric pressure and climatic conditions at the factory. Basic setting This setting is the starting point for fine tuning and can be used as the standard setting. • • Check air filter and clean it if necessary.
, , I FS 88 ~H ,~ I ------FS 108 IiiR • FS 108 no further increase in RPM back off screw one eighth turn. • • • • 38 • • Mount the cutting tool. Trim line to correct length: Lines must extend as far as line limiting blade on the deflector Carry out the basic setting. Warm up engine by running it for about 1 minute at full throttle and then return to idle speed. Back off high speed adjusting screw (H) one half turn (counterclockwise).
, FS 88 , , L I I@f;j rHR I Lj~ L- ~ FS 108 LA I I I I Adjusting idle speed It is usually necessary to change the setting of the idle speed adjusting screw (LA or LD) after every correction to the low speed adjusting screw (L).
Operating Instructions During break-in period During operation After finishing work A factory new machine should not be run at high revs (full throttle off load) for the first three tank fillings. This avoids unnecessary high loads during the break-in period. After long period of full-throttle operation, allow engine to run for a while at idling speed so that the heat in the engine can be dissipated by flow of cooling air.
Cleaning Air Filter Checking Spark Plug 1 '-=~=======* A (~2---\(~ ':5 8..: 1Il g o If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug. • • • Remove spark plug see "If engine doesn't start:" Clean dirty spark plug. Check electrode gap it should be 0.5 mmlO.020" (A) readjust if necessary.
Lubricating Gearbox Lubricating Drive Shaft 3 4 5 t 01 10 2 • • Remove the foam element (3) and the felt element (4). Wash the filter elements in fresh, non-flammable cleaning solution (e.g. warm soapy water) and then dry. Replace damaged parts of filter. • • 42 Place the felt element in the filter base (5) first and then the foam element. Fit the filter cover (1) - it must snap into position. • •• • Check grease level after about every 50 hours of operation. Unscrew the filler plug (1).
Sharpening Cutting Tools D t 3 ~3 1 ':) 2 (") "' « 0 ([J r-- "' (") o 3 o ':) '" 0 "' « ([J r-- "' (") • • • Pull the shaft (3) out of the drive tube. Use STIHL multipurpose grease 0781 120 1109 to coat dry areas of the shaft: Do not apply too much grease never pump grease into the drive tube. • • • • Push shaft (3) into the drive tube tum it to and fro until distance A is less than 30mm (1.2").
~A o =:JJ.......__4 _ _ m B ,---~-----a'i~ ..,:;:; 2 ~c 3 Sharpen correctly • If slightly dull: Use flat file (4) 0814 212 3310In case of more serious wear or nicks: Resharpen with a grinder maintain a sharpening angle of 30° (A) on the cutting edge (1). • File back the cutting edge parallel to the lines (B) (see illustration). • Resharpen frequently, take away as little material as possible - two or three strokes of the file are usually enough.
)J 4_- 2 Sharpen correctly • • • If slightly dull: Use flat file (4) 0814 2123310In case of more serious wear or nicks: Resharpen with a grinder. File back the cutting edge parallel to the lines (E) (see illustration). Resharpen frequently, take away as little material as possible - two or three strokes of the file are usually enough. 2 Brush knite 250 • Never straighten or weld a bent or cracked brush knife - it might shatter and cause serious or fatal injury.
)n ay! 3- ~) I I '--.-: -,-,I \ \ Sharpen correctly • • • If slightly dull: Use flat file (3) 0814 212 3310In case of more serious wear or nicks: Resharpen with a grinder maintain a sharpening angle of 30 0 (A) on the cutting edge (1). File back the cutting edge parallel to the lines on the sharpening template. Resharpen frequently, take away as little material as possible - two or three strokes of the file are usually enough.
5 4 B~ • • File at the angle marked on the file holder: Filing angle is 15° (A) file should slope upward at an angle of 5° (B). Resharpen frequently, take away as little material as possible - two or three strokes of the file are usually enough. Resetting the teeth If the saw blade does not cut freely or binds in the cut: Check set of teeth • Hold the saw set (4) 4020 893 5000 against the saw blade (5) - if there is a gap (C) between the tooth and saw set: see "Resetting the teeth".
Replacing Starter Rope and Rewind Spring ~ 2 ]ID__2 _ - 0 0 5 '-6 0 Sharpen correctly • File only the back of the tooth (1). • If slightly dull: Use flat file (2) 0814 212 3310. In case of more serious wear or nicks: Resharpen with a grinder until the tips (3) of the teeth are restored to full sharpness. • Resharpen frequently, take away as little material as possible - two or three strokes of the file are usually enough. • Do not alter tooth profile.
a=2mm (O,08in) • • Remove remaining rope from rotor thread the new rope 3.5mm x 800mm (0.14" x 31.5") into the rotor and secure it with a simple overhand knot. Thread other end - from inside - through the rope guide bush in the starter cover and the underside of the starter grip and secure with special knot (7). • • • Coat rope rotor bearing bore with non-resinous oil. Slide rotor onto starter post turn it back and forth until anchor loop (8) of rewind spring engages.
o If the spring has popped out and uncoiled: • Wind up the spring clockwise, from the inside outwards, until its overall diameter is 50mm (2"). • Use pointed nose pliers to grip spring about 10mm (318") from the outer loop and refit it. • Install the rope rotor. o Tensioning the rewind spring • • • The starter grip must be firmly seated in the rope guide bush. If grip droops to one side: • Add one more turn on rope rotor to increase spring tension.
Storing the Machine Spark Arresting Screen in Muffler 1/4 4 • 0 • 1(. I l.1 4 II 4 \ ~ If the engine is low on power, check the spark arresting screen inside the muffler. • • • Pull off the spark plug terminal (1). Take out shroud mounting screws (2). Remove the shroud (3). • • • • • • • • \ (0 I I lo I 0 5 ] 0 Take out the screws (4). Remove the cover (5). Remove the spark arresting screen (6). Clean spark arresting screen if necessary. If screen is damaged or coked up, fit a new one.
Maintenance Chart Please note that the following maintenance intervals apply for normal operating conditions only. If your daily working time is longer than nonmal or conditions are difficult (very dusty work area, etc.), shorten the specified intervals accordingly. g.?-c0 E"(ij ;: ","0 ~.~ ;§o Ot: ~.>< <1>~ Qi!9 ",0 Ol ;: .
Specifications The user of the brushcutter may carry out only the maintenance operations described in this manual. Other repair work may be performed only by an authorized STIHL Service Shop. warranty claims following repairs can be accepted only if the repair has been performed by an authorized STIHL Service Shop using original STIHL spare parts. Original STIHL parts can be identified by the STIHL part number, the logo STIHC and the STIHL parts symbol lSI",. The symbol may appear alone on small parts.
~ Model FS FS FS FS FS FS FS FS 1) 2) 3) 4) 54 88 2 ) 88 2) 88 R 3 ) 88 R 4) Tool Mowina head Metal tool Mowina head Metal tool 108 2) Mowina head 108 2) Metal tool 108 R 3 ) Mowina head 108 R 4) Metal tool Sound pressure level Lpeq to ISO 7917 1) Sound power level Lweq to ISO 10884 1) dB (A) dB (A) 109 103 109 103 111 98 95 98 95 99 96 99 96 105 111 105 Vibration acceleration to ISO 7916 Idle speed (m/s 2 ) Handle riQht left 2.7 2.4 2.7 2.4 2.5 2.0 2.5 2.0 2.4 3.7 2.4 3.7 1.8 1.8 1.8 2.
Special Accessories Cutting Tools 12 STIHL «Supercut 2-2» 4002 710 2140 13 2 STIHL «Supercut 20-2» 40027102162 3 Circular saw blade 200 (scratcher tooth) ** 41127134201 Circular saw blade 200 (chisel tooth) .. 41127134203 Nylon line for mowing heads " 2.4mm/0.095"(orange) - for 1 to 8 15m/50ft 44m/144ft 87m/285ft 261 m/856ft 434m/1424ft 0000 0000 0000 0000 0000 930 930 930 930 930 2243 2244 2245 2246 2247 Mahkopf STIHL ·«Autocut 24-2» 40027102109 "2.7mm/0.
& WARNING! The engine exhaust from this product contains chemicals known to the State of California to cause cancer. birth defects or other reproductive harm. englisch/english U.S.A.
