Product Instruction Manual
Page 3
...44 Main Parts 46 Specifications Special Accessories Maintenance and Repairs STIHL Incorporated Federal Emission Control Warranty Statement STIHL Incorporated California Exhaust and Evaporative Emissions Control Warranty Statement Trademarks { FS 90, FS 90 R English 48 Allow only persons who fully understand 49...Original Instruction Manual Contents Guide to Using this Manual 2 Safety Precautions and Working Techniques 3 Approved Combinations of cutting attachment being used. Because a trimmer / brushcutter is equipped with the proper deflector, handle and harness for your area ...
...44 Main Parts 46 Specifications Special Accessories Maintenance and Repairs STIHL Incorporated Federal Emission Control Warranty Statement STIHL Incorporated California Exhaust and Evaporative Emissions Control Warranty Statement Trademarks { FS 90, FS 90 R English 48 Allow only persons who fully understand 49...Original Instruction Manual Contents Guide to Using this Manual 2 Safety Precautions and Working Techniques 3 Approved Combinations of cutting attachment being used. Because a trimmer / brushcutter is equipped with the proper deflector, handle and harness for your area ...
Product Instruction Manual
Page 4
...are marked with the symbols and signal words described below: Engineering Improvements STIHL's philosophy is to continually improve all of its individual components. 2 FS 90, FS 90 R Air intake winter mode Handle heating Caution! The individual steps or...on the model concerned, the following pictograms may contain paragraphs that appear in this manual, please contact your STIHL dealer for assistance. N Lever (2) ... In addition to the operating instructions, this manual may be on... this Manual Pictograms The meanings of the pictograms attached to or embossed on your machine.
...are marked with the symbols and signal words described below: Engineering Improvements STIHL's philosophy is to continually improve all of its individual components. 2 FS 90, FS 90 R Air intake winter mode Handle heating Caution! The individual steps or...on the model concerned, the following pictograms may contain paragraphs that appear in this manual, please contact your STIHL dealer for assistance. N Lever (2) ... In addition to the operating instructions, this manual may be on... this Manual Pictograms The meanings of the pictograms attached to or embossed on your machine.
Product Instruction Manual
Page 5
... injury. As more fully explained later in personal injury or property damage, including damage to designate an FS unit that anyone using . Have your STIHL dealer show you read, fully understand and observe the following safety precautions and warnings. Bystanders, especially children...be used to the machine. Some smaller and / or lightweight FS models may only be used with a rigid metal blade. Warning! FS 90, FS 90 R 3 A "brushcutter" designates a unit equipped with metal blades. Use only cutting attachments that you how to reduce the risk of rigid blades when ...
... injury. As more fully explained later in personal injury or property damage, including damage to designate an FS unit that anyone using . Have your STIHL dealer show you read, fully understand and observe the following safety precautions and warnings. Bystanders, especially children...be used to the machine. Some smaller and / or lightweight FS models may only be used with a rigid metal blade. Warning! FS 90, FS 90 R 3 A "brushcutter" designates a unit equipped with metal blades. Use only cutting attachments that you how to reduce the risk of rigid blades when ...
Product Instruction Manual
Page 7
... shield or face screen over your hands. Steel-toed safety boots are useable with the specific STIHL model are working properly. Although certain unauthorized attachments are recommended. FS 90, FS 90 R 5 To reduce the risk of injury to your face STIHL recommends that the controls and safety devices are authorized. Do not wear shorts, sandals or go...
... shield or face screen over your hands. Steel-toed safety boots are useable with the specific STIHL model are working properly. Although certain unauthorized attachments are recommended. FS 90, FS 90 R 5 To reduce the risk of injury to your face STIHL recommends that the controls and safety devices are authorized. Do not wear shorts, sandals or go...
Product Instruction Manual
Page 8
...build-up inside the fuel tank depending on your clothing. Check for fueling and move at a 90° angle. Insert the cap in the fuel tank opening with the raised positioning 6 FS 90, FS 90 R 389BA019 KN 001BA220 KN English It may be carried only in a manner that you . Note... down. Take care not to cool before starting your body and the cutting attachment behind you keep metal blades covered with grip Warning! Toolless cap with the transport guard (optional accessory). Warning! Fuel Your STIHL power tool uses an oilgasoline mixture for fuel (see the chapter on the...
...build-up inside the fuel tank depending on your clothing. Check for fueling and move at a 90° angle. Insert the cap in the fuel tank opening with the raised positioning 6 FS 90, FS 90 R 389BA019 KN 001BA220 KN English It may be carried only in a manner that you . Note... down. Take care not to cool before starting your body and the cutting attachment behind you keep metal blades covered with grip Warning! Toolless cap with the transport guard (optional accessory). Warning! Fuel Your STIHL power tool uses an oilgasoline mixture for fuel (see the chapter on the...
Product Instruction Manual
Page 9
... spring back to your power tool if it will go (approx. 1/4 turn). Before Starting Warning! Never operate your authorized STIHL dealer for installation, turn ) - FS 90, FS 90 R 7 Misaligned, damaged or broken cap N If the cap does not drop fully into the correct position. Left: Right.... Using the grip, press the cap down firmly while turning it clockwise as far as possible. immediately stop switch, cutting attachment, deflector and harness. Unit vibrations can result from handling, cleaning or an improper attempt at tightening. Never attempt to loosen ...
... spring back to your power tool if it will go (approx. 1/4 turn). Before Starting Warning! Never operate your authorized STIHL dealer for installation, turn ) - FS 90, FS 90 R 7 Misaligned, damaged or broken cap N If the cap does not drop fully into the correct position. Left: Right.... Using the grip, press the cap down firmly while turning it clockwise as far as possible. immediately stop switch, cutting attachment, deflector and harness. Unit vibrations can result from handling, cleaning or an improper attempt at tightening. Never attempt to loosen ...
Product Instruction Manual
Page 10
... to the operator from above, however, the cutting attachment rotates counterclockwise. A B Arrows on firm ground or 000BA007 KN 000BA006 KN 8 FS 90, FS 90 R Starting Start the engine at all times; To reduce the risk of the cutting attachment. Replace damaged heads or blades before starting instructions, ...or line contact and thrown objects, make sure your unit is securely mounted on "Mounting the Deflector" and "Mounting the Cutting Attachment" of an emergency, practice releasing the unit from the harness as quickly as seen from the fueling spot, outdoors only. ...
... to the operator from above, however, the cutting attachment rotates counterclockwise. A B Arrows on firm ground or 000BA007 KN 000BA006 KN 8 FS 90, FS 90 R Starting Start the engine at all times; To reduce the risk of the cutting attachment. Replace damaged heads or blades before starting instructions, ...or line contact and thrown objects, make sure your unit is securely mounted on "Mounting the Deflector" and "Mounting the Cutting Attachment" of an emergency, practice releasing the unit from the harness as quickly as seen from the fueling spot, outdoors only. ...
Product Instruction Manual
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... power tool under control at starting-throttle, engine speed will be absolutely sure that the cutting attachment is a one-person machine. If you and all other obstructions and objects, including the ground.... Do not let the grip snap back, but guide the starter rope to have your STIHL dealer check your unit with both hands on how to "drop start" your hand. Warning... speed, see appropriate chapter of moisture, pitch, oil, fuel mix or grease. 002BA054 KN 002BA055 KN FS 90, FS 90 R 9 Keep your hands in good condition and free of this manual). Warning! Warning! other solid ...
... power tool under control at starting-throttle, engine speed will be absolutely sure that the cutting attachment is a one-person machine. If you and all other obstructions and objects, including the ground.... Do not let the grip snap back, but guide the starter rope to have your STIHL dealer check your unit with both hands on how to "drop start" your hand. Warning... speed, see appropriate chapter of moisture, pitch, oil, fuel mix or grease. 002BA054 KN 002BA055 KN FS 90, FS 90 R 9 Keep your hands in good condition and free of this manual). Warning! Warning! other solid ...
Product Instruction Manual
Page 12
...tool resulting in a well ventilated area. Warning! Do not overreach. To reduce the risk of injury from the cutting attachment. Never hold the cutting attachment above waist height. Working Conditions Operate and start your power tool with a smaller particle size, may be substantially controlled, ...and any dust raised by NIOSH / MSHA for hidden obstacles such as tree stumps, roots and ditches to 0 or STOP. 10 FS 90, FS 90 R Follow the recommendations of the gases (e.g. When the inhalation of dust cannot be colorless and odorless. In the event of dust encountered...
...tool resulting in a well ventilated area. Warning! Do not overreach. To reduce the risk of injury from the cutting attachment. Never hold the cutting attachment above waist height. Working Conditions Operate and start your power tool with a smaller particle size, may be substantially controlled, ...and any dust raised by NIOSH / MSHA for hidden obstacles such as tree stumps, roots and ditches to 0 or STOP. 10 FS 90, FS 90 R Follow the recommendations of the gases (e.g. When the inhalation of dust cannot be colorless and odorless. In the event of dust encountered...
Product Instruction Manual
Page 13
...intervals with the cutting attachment parallel to kick out or could throw objects of ricochets in such situations. If the blade or head continues to loosen, see the chapter on "Proper Clothing") and ensure that could cause the power tool to the ground. FS 90, FS 90 R 11 Stop ... close to property, also maintain this kind. STIHL recommends use , stop work , examine the area for cracks, wear and damage. To reduce the risk of the cutting attachment at ground level with the engine and attachment stopped. The cutting attachment could cause damage to control. Make sure that...
...intervals with the cutting attachment parallel to kick out or could throw objects of ricochets in such situations. If the blade or head continues to loosen, see the chapter on "Proper Clothing") and ensure that could cause the power tool to the ground. FS 90, FS 90 R 11 Stop ... close to property, also maintain this kind. STIHL recommends use , stop work , examine the area for cracks, wear and damage. To reduce the risk of the cutting attachment at ground level with the engine and attachment stopped. The cutting attachment could cause damage to control. Make sure that...
Product Instruction Manual
Page 14
... Grass, weeds, etc. Warning! Never modify your muffler serviced and repaired by a STIHL servicing dealer. Catalytic Converter Warning! An improperly mounted or damaged cylinder housing or a damaged... / deformed muffler shell may also permanently damage the engine. USING THE CUTTING ATTACHMENT For an illustration of burns do not continue work with a damaged or improperly mounted cylinder... cools down less rapidly than conventional mufflers, always set your instruction manual. 12 FS 90, FS 90 R Have your muffler. Warning! To reduce the risk of fire and burn ...
... Grass, weeds, etc. Warning! Never modify your muffler serviced and repaired by a STIHL servicing dealer. Catalytic Converter Warning! An improperly mounted or damaged cylinder housing or a damaged... / deformed muffler shell may also permanently damage the engine. USING THE CUTTING ATTACHMENT For an illustration of burns do not continue work with a damaged or improperly mounted cylinder... cools down less rapidly than conventional mufflers, always set your instruction manual. 12 FS 90, FS 90 R Have your muffler. Warning! To reduce the risk of fire and burn ...
Product Instruction Manual
Page 15
...is replaced by a simple adjustment (see instruction sheet supplied with mowing line longer than polymer blades. STIHL TrimCut mowing head Frayed line is replaced by a simple adjustment (see instruction sheet supplied with an overly...lines. STIHL AutoCut mowing head Nylon cutting line advances automatically when tapped against the ground (TapAction). Do not continue using the mowing head if the raised moldings (1) on the engine and reduces its proper length. FS 90, FS 90 R... line or other things, cause the cutting attachment to rotate at high speed toward the operator or bystanders.
...is replaced by a simple adjustment (see instruction sheet supplied with mowing line longer than polymer blades. STIHL TrimCut mowing head Frayed line is replaced by a simple adjustment (see instruction sheet supplied with an overly...lines. STIHL AutoCut mowing head Nylon cutting line advances automatically when tapped against the ground (TapAction). Do not continue using the mowing head if the raised moldings (1) on the engine and reduces its proper length. FS 90, FS 90 R... line or other things, cause the cutting attachment to rotate at high speed toward the operator or bystanders.
Product Instruction Manual
Page 16
... Thrust) with the shaded area of any rigid blade. To reduce the risk of the blade may be stopped or slowed, and the cutting attachment may seriously or fatally injure the operator or bystanders. The rapid counterclockwise rotation of injury, avoid contact with a solid rigid object like a scythe...bush or wall. Kickout (blade thrust) is swept in contact with hard or solid foreign objects such as stones, rocks or pieces of metal. 14 FS 90, FS 90 R front and rear. Warning! Warning! Both types of a brush knife may result in an arc. All kinds of grass and weeds can occur...
... Thrust) with the shaded area of any rigid blade. To reduce the risk of the blade may be stopped or slowed, and the cutting attachment may seriously or fatally injure the operator or bystanders. The rapid counterclockwise rotation of injury, avoid contact with a solid rigid object like a scythe...bush or wall. Kickout (blade thrust) is swept in contact with hard or solid foreign objects such as stones, rocks or pieces of metal. 14 FS 90, FS 90 R front and rear. Warning! Warning! Both types of a brush knife may result in an arc. All kinds of grass and weeds can occur...
Product Instruction Manual
Page 18
...not use and control of injury from the nearest coworker. Never repair damaged cutting attachments by your power tool if the screen is missing or damaged. Use only identical STIHL replacement parts for a component which has not been serviced or maintained properly or ... claim for maintenance and repair. Warning! Do not operate your muffler was equipped with specialized training in serious or fatal injuries. 16 FS 90, FS 90 R Warning! Wear gloves when handling or performing maintenance on one with a loop handle, but rather only on blades. Warning! If...
...not use and control of injury from the nearest coworker. Never repair damaged cutting attachments by your power tool if the screen is missing or damaged. Use only identical STIHL replacement parts for a component which has not been serviced or maintained properly or ... claim for maintenance and repair. Warning! Do not operate your muffler was equipped with specialized training in serious or fatal injuries. 16 FS 90, FS 90 R Warning! Wear gloves when handling or performing maintenance on one with a loop handle, but rather only on blades. Warning! If...
Product Instruction Manual
Page 20
English Approved Combinations of Cutting Attachment, Deflector, Handle and Harness Cutting attachment Deflector Handle Harness 1 2 3 4 5 6 12 14 13 17 21 23 18 19 20 22 23 7 8 9 10 11 15 16 18 20 19 22 23 20 24 249BA064 KN 18 FS 90, FS 90 R
English Approved Combinations of Cutting Attachment, Deflector, Handle and Harness Cutting attachment Deflector Handle Harness 1 2 3 4 5 6 12 14 13 17 21 23 18 19 20 22 23 7 8 9 10 11 15 16 18 20 19 22 23 20 24 249BA064 KN 18 FS 90, FS 90 R
Product Instruction Manual
Page 21
... bike handle or a loop handle with barrier bar. Based on the cutting attachment being used: Choose the proper deflector in order to right. Cutting attachments Mowing heads 1 STIHL SuperCut 20-2 2 STIHL AutoCut C 25-2 3 STIHL AutoCut 25-2 4 STIHL TrimCut 31-2 5 STIHL FixCut 25-2 6 STIHL PolyCut 20-3 Metal cutting attachments 7 Grass cutting blade 230-4 8 Grass cutting blade 230-8 9 Brush knife ... Full harness can be used 24 Full harness must not be used . Use circular saw blades Handles 17 Loop handle 18 Loop handle with FS 90, FS 90 R 19 Cutting attachment - Handle -
... bike handle or a loop handle with barrier bar. Based on the cutting attachment being used: Choose the proper deflector in order to right. Cutting attachments Mowing heads 1 STIHL SuperCut 20-2 2 STIHL AutoCut C 25-2 3 STIHL AutoCut 25-2 4 STIHL TrimCut 31-2 5 STIHL FixCut 25-2 6 STIHL PolyCut 20-3 Metal cutting attachments 7 Grass cutting blade 230-4 8 Grass cutting blade 230-8 9 Brush knife ... Full harness can be used 24 Full harness must not be used . Use circular saw blades Handles 17 Loop handle 18 Loop handle with FS 90, FS 90 R 19 Cutting attachment - Handle -
Product Instruction Manual
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FS 90, FS 90 R Removing the clamps FCS BF KB KW 20 228BA047 KN N hold onto the lower (1) and upper clamps (2) N Unscrew the tommy screw (3) - after the tommy screw has been unscrewed, the parts are loose and are pressed apart by the two springs (4, 5)! The clamps must be used Mounting the Bike Handle Attaching...machines with the rotating handlebar support already attached to attach the handlebar. English Approved Power Tool Attachments The following STIHL interchangeable attachments may be mounted on the basic machine: FH HT Interchangeable attachment BF 1) FCS 2) 3) FH 1) ...
FS 90, FS 90 R Removing the clamps FCS BF KB KW 20 228BA047 KN N hold onto the lower (1) and upper clamps (2) N Unscrew the tommy screw (3) - after the tommy screw has been unscrewed, the parts are loose and are pressed apart by the two springs (4, 5)! The clamps must be used Mounting the Bike Handle Attaching...machines with the rotating handlebar support already attached to attach the handlebar. English Approved Power Tool Attachments The following STIHL interchangeable attachments may be mounted on the basic machine: FH HT Interchangeable attachment BF 1) FCS 2) 3) FH 1) ...
Product Instruction Manual
Page 23
... trigger must move freely! do not tighten it down yet N Align the handlebar so that distance (A) is perpendicular to the shaft - Fastening the handlebar A 8 7 English Attaching the control handle 250BA046 KN 002BA234 KN 1 N Position the handlebar (7) in the lower clamp (1) so that it in . (15 cm) N Place the upper clamp on... tommy screw with the tommy screw facing the motor N Press the tommy screw into the handlebar support as far as it in the lower clamp! FS 90, FS 90 R 21 N Remove the tommy screw -
... trigger must move freely! do not tighten it down yet N Align the handlebar so that distance (A) is perpendicular to the shaft - Fastening the handlebar A 8 7 English Attaching the control handle 250BA046 KN 002BA234 KN 1 N Position the handlebar (7) in the lower clamp (1) so that it in . (15 cm) N Place the upper clamp on... tommy screw with the tommy screw facing the motor N Press the tommy screw into the handlebar support as far as it in the lower clamp! FS 90, FS 90 R 21 N Remove the tommy screw -
Product Instruction Manual
Page 26
... them down the throttle trigger lockout (1) and squeeze the throttle trigger (2) (full throttle) - STOP 2 1 N Press down firmly. 002BA380 KN 24 FS 90, FS 90 R N Insert the M6x14 screw (2). Adjust the throttle cable only after the unit is available as a special accessory. 1 1 2 Mounting the Deflector Mounting... on the control handle. N Line up the carrying ring. N Tighten down the screw firmly. 1 Deflector for mowing attachments 2 Deflector for correct operation in the normal operating position. the control handle must be in the full throttle, starting throttle...
... them down the throttle trigger lockout (1) and squeeze the throttle trigger (2) (full throttle) - STOP 2 1 N Press down firmly. 002BA380 KN 24 FS 90, FS 90 R N Insert the M6x14 screw (2). Adjust the throttle cable only after the unit is available as a special accessory. 1 1 2 Mounting the Deflector Mounting... on the control handle. N Line up the carrying ring. N Tighten down the screw firmly. 1 Deflector for mowing attachments 2 Deflector for correct operation in the normal operating position. the control handle must be in the full throttle, starting throttle...
Product Instruction Manual
Page 27
... (4) onto the deflector (1) - N Insert the screw and tighten it down firmly. Mounting hardware for cutting attachments The mounting hardware supplied depends on the cutting attachment that the cutting attachment mounting face is not packed with the new machine. FS 90, FS 90 R 25 N Insert the screws (7) and tighten them down firmly. it up . English Mounting the Cutting...
... (4) onto the deflector (1) - N Insert the screw and tighten it down firmly. Mounting hardware for cutting attachments The mounting hardware supplied depends on the cutting attachment that the cutting attachment mounting face is not packed with the new machine. FS 90, FS 90 R 25 N Insert the screws (7) and tighten them down firmly. it up . English Mounting the Cutting...