STIHL FS 75 Owner's Manual

STIHL FS 75
STIH)
Instruction Manual Manual de instrucciones
Warning!
For safe operation follow all safety precautions in Instruction Manual - improper use can cause serious injury.
Advertencia!
Para su seguridad durante el manejo de este producto, siga siempre las precauciones de seguridad dadas en el manual de instrucciones - el uso indebido puede causar lesiones graves.

Contents

English / USA
Guide to Using this Manual .............. 2
Safety Precautions and
Working Techniques ......................... 3
Mounting the Loop Handle ............. 14
Fitting the Carrying Eye* ................ 15
Mounting the Deflector ................... 15
Mounting the Cutting Tools ............. 15
BA_SE_068_007_01_04.fm Printed on chlorine-free paper.
Fuel ................................................ 18
Fueling ............................................ 19
Fitting the Harness ......................... 20
Starting / Stopping the Engine ........ 20
Operating Instructions .................... 23
Cleaning the Air Filter ..................... 23
Motor Management ........................ 24
Adjusting the Carburetor ................ 24
Spark Arresting Screen*
in Muffler ......................................... 26
Checking the Spark Plug ................ 26
Replacing the Starter Rope
and Rewind Spring ......................... 27
Storing the Machine ........................ 30
Replacing Nylon Line ..................... 30
Maintenance Chart ......................... 32
Parts and Controls .......................... 33
Specifications ................................. 35
Special Accessories ....................... 36
Printing inks contain vegetable oils; paper can be recycled.
Maintenance and Repairs ............... 36
STIHL Incorporated Federal and California Emission Control
Warranty Statement ........................ 37
Allow only persons who understand this manual to operate your trimmer.
To receive maximum performance and satisfaction from your STIHL trimmer, it is important that you read and under­stand the maintenance and safety precautions, starting on page 3, before using your trimmer.
Contact your STIHL dealer or the STIHL distributor for your area if you do not understand any of the instructions in this manual.
!Warning!
Because a trimmer is a high-speed cutting tool some special safety pre­cautions must be observed to reduce the risk of personal injury.
Careless or improper use may cause serious or even fatal injury. Make sure your unit is equipped with the proper deflector, handle and harness for the type of cutting attachment being used. Always wear proper eye protection.
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 trimmer differs from those described in this manual, please contact your STIHL dealer for information and assistance.
* see “Guide to Using this Manual”
STIHl
© ANDREAS STIHL AG & Co. KG, 2004
0458 392 3021. M3. A4. PM. Printed in USA
1FS 75
English / USA

Guide to Using this Manual

Pictograms
All the pictograms attached to the machine are shown and explained in this manual.
The operating and handling instructions are supported by illustrations.
Symbols in text
The individual steps or procedures described in the manual may be marked in different ways:
: Step or procedure without direct
reference to an illustration.
Description of step or procedure that refers directly to the illustration and contains item numbers that appear in the illustration. Example:
Loosen the screw (1)
Lever (2) ...
In addition to the operating instructions, this manual may contain paragraphs that require your special attention. Such paragraphs are marked with the symbols described below:
Warning where there is a risk of an accident or personal injury or serious damage to property.
Warning where there is a risk of damaging the machine or individual components.
Note or hint which is not essential for using the machine, but may improve the operator’s under­standing of the situation and result in better use of the machine.
Note or hint on correct procedure in order to avoid damage to the environment.
Equipment and features
This instruction manual refers to several models with different features. Components that are not installed in all models and related applications are marked thus Such components are available as special accessories from your STIHL dealer.
*.
Engineering improvements
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 machine differ from those described in this manual, please contact your STIHL dealer for assistance.
Therefore, we cannot be responsible for changes, modifications or improvements not covered in this manual.
2
FS 75

Safety Precautions and Working Techniques

English / USA
Warning!
Because a trimmer is a high-speed, fast-cutting power tool, special safety precautions must be observed to reduce the risk of personal injury.
It is important that you read, fully understand and observe the following safety precautions and warnings. Read the
owner's manual and the safety instructions periodically. Careless or improper use of any trimmer may cause serious or fatal injury.
Have your STIHL dealer show you how to operate your trimmer. Observe all applicable local safety regulations, standards and ordinances.
!Warning!
Do not lend or rent your trimmer without the owner's manual. Be sure that any­one using your trimmer understands the information contained in this manual.
!Warning!
The use of any trimmer may be hazardous. If the rotating cutting tool comes in contact with your body, it will cut you. When it comes in contact with solid foreign objects such as rocks or bits of metal, it may fling them directly or by ricochet in the direction of bystanders or the operator. Striking such objects could damage the cutting tool. Thrown objects or damaged cutting tools may result in serious or fatal injury to the operator or bystanders.
!Warning!
Minors should never be allowed to use a trimmer. Bystanders, especially children, and animals should not be allowed in the area where a trimmer is in use.
Never let the trimmer run unattended.
Most of these safety precautions and warnings apply to the use of all STIHL trimmers. Different models may have different parts and controls. See the appropriate section of your owner's manual for a description of the controls and function of the parts of your model trimmer.
Safe use of a trimmer involves
1. the operator
2. the trimmer
3. the use of the trimmer.
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.) which might impair vision, dexterity or judgement. Do not operate a trimmer when you are fatigued.
Be alert - if you get tired while operating your trimmer, take a break. Tiredness may result in loss of control. Working with any trimmer can be strenuous. If you have any condition that might be aggravated by strenuous work, check with your doctor before operating a trimmer.
3FS 75
English / USA
!Warning!
Prolonged use of a trimmer (or other machines) exposing the operator to vibrations may produce whitefinger disease (Raynaud's phenomenon) or carpal tunnel syndrome.
These conditions reduce the hand's ability to feel and regulate temperature, produce numbness and burning sensations and may cause nerve and circulation damage and tissue necrosis.
All factors which contribute to white­finger disease are not known, but cold weather, smoking and diseases or physical conditions that affect blood vessels and blood transport, as well as high vibration levels and long periods of exposure to vibration are mentioned as factors in the development of whitefinger disease. In order to reduce the risk of whitefinger disease and carpal tunnel syndrome, please note the following:
: Most STIHL power tools are
available with an anti-vibration ("AV") system designed to reduce the transmission of vibrations created by the engine to the operator's hands. An AV system is recommended for those persons using power tools on a regular or sustained basis.
: Wear gloves and keep your hands
warm.
: Keep the AV system well
maintained. A trimmer with loose components or with damaged or worn AV buffers will tend to have higher vibration levels.
: Maintain a firm grip at all times, but
do not squeeze the handles with constant, excessive pressures and take frequent breaks.
All the above mentioned precautions do not guarantee that you will not sustain whitefinger disease or carpal tunnel syndrome. Therefore continual and regular users should monitor closely the condition of their hands and fingers. If any of the above symptoms appear, seek medical advice immediately.
!Warning!
The ignition system of the STIHL unit produces an electromagnetic field of a very low intensity. This field may interfere with some pacemakers. To reduce the risk of serious or fatal injury, persons with pacemaker should consult their physician and the pacemaker manufacturer before operating this tool.
Proper Clothing
!Warning!
To reduce the risk of injury, the operator should wear proper protective apparel.
!Warning!
The deflector provided with your trimmer may not protect the operator from all foreign objects (gravel, glass, wire, etc.) thrown by the rotating cutting tool. Thrown objects may also ricochet and strike the operator.
!Warning!
To reduce the risk of injury to your eyes never operate a trimmer unless wearing goggles or properly fitted safety
glasses with adequate top and side protection complying with ANSI Z 87.1 (or your applicable national standard).
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.
4
FS 75
English / USA
!Warning!
Trimmer 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.
Protect your hands with
gloves when handling the
trimmer and the cutting
tool. Heavy-duty, nonslip
gloves improve your grip
and protect your hands.
Clothing must be sturdy
and snug-fitting, but allow
complete freedom of
movement. Avoid loose-
fitting jackets, scarfs,
neckties, jewelry, flared or cuffed pants, unconfined longhair or anything that could become caught on branches, brush or moving parts of the unit. Wear long pants made of heavy material to protect your legs. Do not wear shorts, pants, sandals or go bare foot. Secure hair so it is above shoulder level.
Good footing is most important in trimmer work. Wear sturdy boots with nonslip soles. Steel-toed safety boots are recommended.
Wear an approved safety hard hat to reduce the risk of injury to your head when there is a danger of head injuries.
THE TRIMMER
For illustrations and definitions of the trimmer parts see the chapter on "Parts and Controls".
!Warning!
Never modify a trimmer in any way. Only attachments supplied by STIHL or expressly approved by STIHL for use with the specific STIHL trimmer models are authorized. Although certain unauthorized attachments are useable for the STIHL trimmer, their use may, in fact, be extremely dangerous.
!Warning!
To reduce the risk of injury to operator from blade contact, metal blades may be used on FS-trimmers equipped with a bicycle, "J" handle or loop handle with barrier bar and not on those FS- and FE-models with a loop handle only.
Never use any metal cutting attachment on a FS-model that has a bent shaft.
5FS 75
English / USA
THE USE OF THE TRIMMER
Transporting the trimmer
!Warning!
Always turn off the engine and make sure the cutting attachment has stop­ped before putting a trimmer down. When transporting your trimmer in a vehicle, properly secure it to prevent turnover, fuel spillage and damage to the trimmer.
Preparation for the use of the trimmer
Adjust hand grip according to instructions in the owner's manual to suit your size before starting work.
Always check your trimmer for proper condition and operation before starting, particularly the throttle trigger, throttle trigger interlock (if applicable), stop switch, cutting tool, and deflector.
Arrows on the deflector show the correct direction of rotation of the cutting tool.
The throttle trigger must move freely and always spring back to the idle position. The cutting tool must be properly tightened and in safe operating condition. Inspect for loose parts (nuts,
234BA004KN
screws, etc.).
Fueling
Your STIHL trimmer uses an oil-gasoline mixture for fuel (see the chapter on "Fuel" of your owner's manual).
!Warning!
Gasoline is an extremely flammable fuel. If spilled and ignited by a spark or other ignition source, it can cause fire and serious
burn injury or property damage. Use extreme caution when handling gasoline or fuel mix.
Do not smoke or bring any fire or flame near the fuel or trimmer.
Fueling Instructions
!Warning!
Fuel your trimmer in well-ventilated areas, outdoors. Always shut off the engine and allow it to cool before refueling. Gasoline vapor pressure may build up inside the gas tank depending on the fuel used, the weather conditions, and the venting system of the tank. In order to reduce the risk of burns and other personal injury from escaping gas vapor and fumes, remove the fuel filler cap on your trimmer carefully so as to allow any pressure build-up in the tank to release slowly. Never remove fuel filler cap while engine is running.
6
FS 75
English / USA
Select bare ground for fueling and move at least 10 feet (3 m) from the fueling spot before starting the engine. Wipe off any spilled fuel before starting your trimmer and check for leakage.
!Warning!
Check for fuel leakage while refueling and during operation. If fuel or oil leakage is found, do not start or run the engine until leak is fixed and spilled fuel has been wiped away. Take care not to get fuel on your clothing. If this happens, change your clothing immediately.
Different models may be equipped with different fuel caps.
Cap with Grip
!Warning!
In order to reduce the risk of fuel spillage and fire from an improperly tightened fuel cap, correctly position and tighten the fuel cap in the fuel tank opening.
To do this with this STIHL cap, raise the grip on the top of the cap until it is upright at a 90° angle. Insert the cap in the fuel
tank opening with the triangular marks on the grip of the cap and on the fuel tank opening lining up. Using the grip, turn the cap firmly clockwise as far as it will go (approx. a quarter turn).
Fold the grip flush with the top of the cap. If the grip does not lie completely flush with the cap and the detent on the grip does
not fit in the corresponding recess in the filler neck, the cap is not properly seated and tightened and you must repeat the above steps.
Screw Cap
!Warning!
Unit vibrations can cause
an improperly tightened
fuel filler cap to loosen or
come off and spill
quantities of fuel.
In order to reduce the risk of fuel spillage and fire, tighten the fuel filler cap by hand with as much force as possible.
Starting
!Warning!
Your trimmer is a one-person machine. Once started, it may fling foreign objects for a great distance.
15m (50ft)
To reduce the risk of eye and other injury insure that bystanders are at least 50 feet (15 m) away. Bystanders should be encouraged to wear eye protection. Stop the engine and cutting tool immediately if you are approached. Start and operate your trimmer without assistance. For specific starting instructions, see the appropriate section of your manual. Place the trimmer on firm ground or other solid surface in an open area. Maintain a good balance and secure footing.
7FS 75
English / USA
!Warning!
To reduce the risk of injury from loss of control, be absolutely sure that the cutting tool is clear of you and all other obstructions and objects, including the ground, because when the engine starts at starting-throttle, engine speed will be fast enough for the clutch to engage and turn the cutting tool.
!Warning!
When you pull the starter grip, don't wrap the starter rope around your hand. Do not allow the grip to snap back, but guide the starter rope to rewind it properly. Failure to follow this procedure may result in injury to hand or fingers and may damage the starter mechanism.
With the engine running but at idle, attach the trimmer to the spring hook of your harness (see appropriate chapter of this manual).
Catalytic converter
!Warning!
Some STIHL trimmer
models are equipped with
a catalytic converter,
which is designed to
reduce the exhaust
emissions of the engine by a chemical process in the muffler. Due to this process, the muffler does not cool down as rapidly as conventional mufflers when the engine returns to idle or is shut off. To reduce the risk of fire and burn injuries, the following specific safety precautions must be observed.
!Warning!
Since a muffler with a catalytic converter cools down less rapidly than conven­tional mufflers, always set your trimmer down in the upright position and never locate it where the muffler is near dry brush, grass, wood chips or other combustible materials while it is still hot.
Let the engine cool down sitting on concrete, metal, bare ground or solid wood (e.g. the trunk of a felled tree) away from any combustible substances.
!Warning!
To reduce the risk of fire or burn injury, let the unit cool down before refueling your trimmer after use.
!Warning!
Never disassemble or modify your muffler. The muffler could be damaged and cause an increase in heat radiation or sparks, thereby increasing the risk of fire or burn injury. You may also permanently damage the engine. Have your muffler serviced and repaired by your STIHL Servicing Dealer only.
!Warning!
To reduce the risk of fire or burn injury, keep the area around the muffler clean. Remove all debris such as pine needles, branches or leaves.
8
FS 75
English / USA
!Warning!
An improperly mounted or damaged cylinder housing or a damaged/ deformed muffler shell may interfere with the cooling effect of the catalytic converter. To reduce the risk of fire or burn injury, do not continue work with a damaged or improperly mounted cylinder housing or a damaged/ deformed muffler shell. Your catalytic converter is furnished with screens designed to reduce the risk of fire from the emission of hot particles. Due to the heat from the catalytic reaction, these screens will normally stay clean and need no service or maintenance. If you experience loss of performance and you suspect a clogged screen, have your muffler maintained by a STIHL Servicing Dealer.
Working Conditions
Operate and start your trimmer only outdoors in a ventilated area. Operate the trimmer under good visibility and daylight conditions only. Work carefully.
!Warning!
Your trimmer produces
toxic exhaust fumes as
soon as the engine is
running. These gases
(e.g. carbon monoxide)
may be colorless and odorless. To reduce the risk of serious or fatal injury from inhaling toxic fumes, never run the trimmer indoors or in poorly ventilated locations.
!Warning!
Use of this product can generate dust and fumes containing chemicals known to cause respiratory disease, cancer, birth defects, or other reproductive harm. If you are unfamiliar with the risks associated with the particular dust or fume at issue, consult your employer, governmental agencies such as OSHA and NIOSH, and other sources on hazardous materials. California and some other authorities, for instance, have published lists of substances known to cause cancer, reproductive toxicity, etc. Control dust and fumes at the source where possible. In this regard use good work practices and follow the recommendations of OSHA/NIOSH and occupational and trade associations.
When the inhalation of toxic dust and fumes cannot be eliminated, the operator and any bystanders should always wear a respirator approved by NIOSH / MSHA for the type of dust and / or fumes encountered."
!Warning!
The muffler and other parts of the engine (e.g. fins of the cylinder, spark plug) become hot during operation and remain hot for a while after stopping the engine. To reduce risk of burns do not touch the muffler and other parts while they are hot.
Do not cut any material other than weed or similar soft vegetation. The cutting tools may be used only for the operations described in your manual.
9FS 75
English / USA
Always hold the trimmer firmly with both hands. Wrap your fingers tightly around the handles, keeping the handles cradled between your thumb and fore­finger. Keep your hands in this position to have your trimmer under control at all times. Make sure your trimmer handles and grip are in good condition and free of moisture, pitch, oil or grease.
!Warning!
Never attempt to operate any trimmer with one hand. Loss of control of the trimmer resulting in serious or fatal injury may result.
!Warning!
To reduce the risk of bodily injury resulting from loss of control and/or contact with the cutting tool, make sure your unit is equipped with the proper handle and harness for the type of cutting attachment being used.
002BA057 KN002BA056 KN
!Warning!
To reduce the risk of injury from thrown objects and blade contact,
never operate a trimmer without a properly mounted deflector. Keep the deflector (and the skirt where appropriate) 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. Special care must be taken in slippery conditions (wet ground, snow) and in difficult, overgrown terrain. Watch for hidden obstacles such as tree stumps, roots and ditches to avoid stumbling. Be extremely cautious when working on slopes or uneven ground.
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.
!Warning!
This trimmer is normally to be used at ground level with the cutting attachment parallel to the ground. Use of a trimmer above ground level or with the cutting attachment perpendicular to the ground may increase the risk of injury, since the cutting attachment is more fully exposed and the trimmer may be more difficult to control. Never use your trimmer as a hedge trimmer.
Do not operate using the starting throttle lock as you do not have control of the engine speed. See section of your owner's manual on the proper use of the slide control.
If the cutting tool or deflector becomes clogged or stuck, always turn off the engine and make sure the cutting tool has stopped, before cleaning. Grass, weeds, etc. should be cleaned off the cutting tool at regular intervals.
10
FS 75
English / USA
!Warning!
During cutting, check the tightness and the condition of the cutting tool at regular intervals. If the behavior of the tool changes, stop the engine im­mediately, and check the nut securing the tool for tightness and the cutting tool for cracks and damage. Replace damaged cutting tools immediately. Such tools may shatter at high speed and cause serious or fatal injury.
!Warning!
Keep hands and feet away from cutting tool. Never touch a rotating cutting tool with your hand or any part of your body. It
continues to rotate for a short period after the throttle trigger is released (flywheel effect).
Important adjustments
!Warning!
To reduce the risk of personal injury from loss of control or contact with the running cutting tool, do not use a cutting tool with incorrect idle adjustment. At correct idle speed, the cutting tool should not move. For directions on how to adjust idle speed, see the appropriate section of your owner's manual.
If you cannot set the correct idle speed, have your STIHL dealer check your trimmer and make proper adjustments and repairs.
MAINTENANCE, REPAIR AND STORING
Maintenance, replacement, or repair of the emission control devices and systems may be performed by any nonroad engine repair establishment or individual. However if you claim warranty for a component which has not been serviced or maintained properly or if non-approved replace­ment parts were used, STIHL may deny warranty.
!Warning!
Use only STIHL replacement parts for maintenance and repair. Use of non-STIHL parts 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 on the last pages of this manual.
!Warning!
Always stop the engine and make sure that the cutting tool is stopped before doing any maintenance or repair work or cleaning the trimmer. Do not attempt any maintenance or repair work not described in your owner's manual. Have such work performed at your STIHL service shop only.
11FS 75
English / USA
!Warning!
Never repair damaged cutting tools by welding, straightening or modifying the shape. This may cause parts of the cutting tool to come off and result in serious or fatal injuries.
!Warning!
Check condition of cutting 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 cutting tools immediately, even if they have only superficial cracks. If the tool loosens after being properly tightened, the retaining nut may be worn or damaged and should be replaced. If the tool continues to loosen, see your STIHL dealer.
!Warning!
To reduce the risk of fire and burn injuries, check fuel filler cap for leaks at regular intervals. Use the specified spark plug and make sure it and the ignition lead are always clean and in good condition.
!Warning!
Never test the ignition system with ignition wire terminal removed from spark plug or with unseated spark plug, since uncontained sparking may cause a fire.
!Warning!
To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL. Always press spark plug boot snugly onto spark plug terminal of the proper size. (Note: If terminal has detachable SAE adapter nut, it must be attached.) A loose connection between spark plug terminal and ignition wire connector in the boot may create arcing that could ignite combustible fumes and cause a fire. Keep spark plug clean, and make sure ignition lead is in good condition.
!Warning!
Do not operate your trimmer if the muffler is damaged, missing or modified. An improperly maintained muffler will increase the risk of fire and hearing loss. Never touch a hot muffler or burn will result. If your muffler was equipped with a spark-arresting screen to reduce the risk of fire, never operate your trimmer if the screen is missing or damaged. Do not modify or remove any part of the muffler or spark arresting screen.
Remember that the risk of forest fires is greater in hot or dry weather.
Tighten all nuts, bolts and screws, except the carburetor adjustment screws, after each use.
Additionally, the daily maintenance schedule for your trimmer set forth in your STIHL Owner's Manual should be strictly followed.
For any maintenance please refer to the maintenance chart and to the warranty statement near the end of this manual.
Store trimmer in a dry, high or locked location out of reach of children.
Before storing for longer than a few days, always empty the fuel tank.
12
FS 75
English / USA
USING THE CUTTING TOOLS
For an illustration of the various cutting tools and instructions on proper mount­ing see the chapter on "mounting the cutting head" in your owner's manual.
Using the mowing heads
The STIHL AutoCut and PolyCut mowing heads produce a clean and tidy finish.
They are to be used only on trimmers equipped with a limiter blade in the deflector in order to keep the line at the proper length (see "Parts and Controls" chapter of this manual).
If the lawn edges are planted with trees or bordered by a fence etc., it is best to use a nylon line head. It achieves a "softer" cut with less risk of damaging tree bark etc. than with the polymer blades.
However, the polymer bladed STIHL "PolyCut" produces a better cut if there are no plants along the edge of the lawn. Sharpening is not necessary and worn cutting blades are easily replaced.
!Warning!
To reduce the risk of serious injury, never use wire or metal-reinforced line or other material in place of the nylon cutting lines. Pieces of wire could break off and be thrown at high speed toward
000BA019 KN
the operator or bystanders.
STIHL "AutoCut" mowing head
Nylon cutting cord advances auto­matically when tapped against the ground.
STIHL "PolyCut" mowing head
Uses either nylon lines or nonrigid plastic blades
002BA177 KN
Important!
Three rectangular wear limit marks are applied to the base (periphery) of the Polycut 10-3. To reduce the risk of serious injury from breakage of the head or blades, the Polycut must not be used when it has worn as far as one of these marks. It is important to follow the maintenance instructions supplied with the head!
13FS 75
English / USA

Mounting the Loop Handle

1
2
Check wear limit marks at regular intervals.
Wear limit marks are incorporated in the base of the PolyCut.
Stop using your PolyCut 5-3 immediately if one of the round holes (1; arrow) becomes visible, or if the upright rim (2; arrow) is worn as shown. Install a new mowing head.
It is essential to observe the wear limit marks since there is otherwise a risk of the cutting tool shattering. Thrown parts may result in personal injury.
002BA073 KN
2
3
A
002BA074 KN
: Fit the loop handle (1) on the drive
tube, 5,9“ (15 cm) forward of the control handle (2).
: Fit clamp (3) against drive tube and
slide it into the loop handle.
1
4
5
50 mm
355BA030 KN
: Insert the square nut (4) in the loop
handle.
: Fit the clamp screw (5) from the
other side and tighten down firmly.
( 2" )
Adjusting loop handle to most comfortable position
: Loosen the clamp screw (5).
: Slide the loop handle along the drive
tube as required.
: Retighten the clamp screw.
343BA023 KN
14
FS 75
English / USA

Fitting the Carrying Eye*

1
1
2
: For position of carrying eye see
"Parts and Controls"
: Place the clamp (1) with the
tapped hole on the left-hand side
of the drive tube.
: Squeeze the two ends of the clamp
together and hold in that position.
: Insert M 6 x 14 screw (2).
: Line up the carrying eye.
: Tighten down the screw firmly.

Mounting the Deflector

2
1
002BA142 KN
: Slip the clamp (1) over the
deflector (2).
: Push deflector with clamp onto the
bearing housing (3) as far as stop.
: Tighten down the clamp.

Mounting the Cutting Tools

1
3
342BA045 KN
3
2
4
342BA002 KN
Preparations
: Lay your trimmer on its back with
the shaft (2) facing up.
STIHL-“AutoCut 11-2“
: Take the thrust plate (1) off the
shaft (2).
STIHL-“PolyCut“
: Fit the thrust plate (1) on the shaft
(2) so that internal hexagon (3) engages hexagon (4).
342BA020 KN
* see "Guide to Using this Manual"
15FS 75
English / USA
2
6
2
2
2
1
Blocking the Drive Shaft
: Insert the stop pin (1) in the bores
(2) in the defelector and thrust plate.
Turn thrust plate to and fro until the stop pin slips into position and blocks the shaft.
1
342BA021 KN
Mounting the Mowing Head
Keep instruction sheet for cutting head in a safe place.
Assembling STIHL AutoCut 11-2
: Fit spring (1) in the spool
housing (2).
: Wind the nylon lines onto the spool:
see "Replacing Nylon Line"
: Assemble the mowing head: see
"Replacing Nylon Line"
4
3
5
681BA014 KN
: Slip the mowing head (2) over the
shaft (3) and engage hexagon recess (4) on external hexagon (5).
: Fit the cap (6) on the mowing head
and screw it clockwise onto shaft as far as stop. Tighten it down firmly.
681BA015 KN
16
FS 75
English / USA
8
7
3
STIHL PolyCut 10-3
: Screw the mowing head (7)
clockwise onto the shaft (3) as far as stop.
: Use stop pin to block the shaft.
: Tighten down the mowing head
firmly.
Remove the stop pin.
7
3
681BA016 KN
STIHL PolyCut 5-3
: Place the nut (8) in the mowing
head.
: Screw the mowing head (7)
clockwise onto the shaft (3) as far as stop.
: Use stop pin to block the shaft.
: Tighten down the mowing head
firmly.
Remove the stop pin.
2
681BA017 KN
Adjusting Nylon Line
STIHL AutoCut 11-2
: Hold the rotating mowing head
horizontal to the ground – tap it on the ground – about 3 cm (1 1/4") fresh line is advanced.
: The blade (1) on the deflector (2)
trims surplus line to the correct length. Avoid tapping the head more than once.
1
342BA024 KN
17FS 75
English / USA

Fuel

Line feed operates only if both lines are at least 2.5cm (1") long.
STIHL PolyCut 10-3
Refer to instructions supplied with the mowing head.
Removing the Mowing Head
: Block the shaft.
: Unscrew the mowing head
counterclockwise.
Replacing Cutting Line
AutoCut
See chapter "Replacing Nylon Line".
PolyCut 10-3
Refer to instructions supplied with the mowing head.
Replacing Thermoplastic Blades
PolyCut
Follow the instructions supplied with the mowing head.
This engine is certified to operate on unleaded gasoline and the STIHL two­stroke engine oil at a mix ratio of 50:1.
Your two-stroke engine requires a mixture of high-quality gasoline and quality two-stroke air cooled engine oil.
Use mid-grade unleaded gasoline with a minimum octane rating of 89 (R+M/2). If the octane rating of the mid-grade gasoline in your area is lower, use premium unleaded fuel.
Fuel with a lower octane rating may increase engine temperatures. This, in turn, increases the risk of piston seizure and damage to the engine.
The chemical composition of the fuel is also important. Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as well. This could cause running problems or even damage the engine. For this reason STIHL recommends that you use only nationally recognized high-quality unleaded gasoline!
Use only STIHL two-stroke engine oil or equivalent high-quality two-stroke engine oils that are designed for use only in air cooled two-cycle engines.
We recommend STIHL 50:1 two-stroke engine oil since it is specially formulated for use in STlHL engines.
Do not use BIA or TCW rated (two­stroke water cooled) mix oils or other mix oils that state they are for use in both water cooled and air cooled engines (e.g., outboard motors, snowmobiles, chainsaws, mopeds, etc.).
Take care when handling gasoline. Avoid direct contact with the skin and avoid inhaling fuel vapor. When filling at the pump, first remove the canister from your vehicle and place the canister on the ground before filling. Do not fill fuel canisters that are sitting in or on a vehicle.
The canister should be kept tightly closed in order to avoid any moisture getting into the mixture.
The machine‘s fuel tank and the canister in which fuel mix is stored should be cleaned as necessary.
18
FS 75
Fuel mix ages
Only mix sufficient fuel for a few days work, not to exceed 3 months of storage. Store in approved fuel-canisters only. When mixing, pour oil into the canister first, and then add gasoline. Close the canister and shake it vigorously by hand to ensure proper mixing of the oil with the fuel.
English / USA

Fueling

Gaso­line
Oil (STIHL 50:1 or equivalent high-quality oils)
US gal. US fl.oz
12.6 2 1/2 6.4
512.8
Dispose of empty mixing-oil canisters only at authorized disposal locations.
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.
In order to reduce the risk of burns 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.
After fueling, tighten fuel cap as securely as possible by hand.
389BA031 KN
Change the fuel pick up body every year.
Before storing your machine for a long period, drain and clean the fuel tank and run engine until carburetor is dry.
389BA032 KN
19FS 75
English / USA

Fitting the Harness

1
2
Shoulder Strap*
: Put on the shoulder strap (1).
: With the brushcutter attached,
adjust length of strap until the spring hook (2) is about a hand’s width below your right hip.

Starting / Stopping the Engine

2
392BA039 KN
Controls
Throttle trigger interlock (1)
Throttle trigger (2)
Slide control (3)
7
STOP-
4
STOP
5
3
START
6
1
Symbol on slide control
h (7) – stop symbol and arrow – to stop the engine, push the slide control in direction of the arrow on the stop symbol (h ) to STOP-O.
Starting
: Hold down the throttle trigger
interlock and squeeze the throttle trigger.
: While holding both levers in this
position, move the slide control to START and hold it there.
: Now release the throttle trigger,
slide control and trigger interlock in
002BA181 KN
that order. This is the starting throttle position.
* see "Guide to Using this Manual"
20
Positions of Slide Control
STOP-O (4) – engine off – the ignition is
switched off # – normal run position (5) – the engine
is running or can start
START (6) - the ignition is switched on, the engine can start
FS 75
8
8
9
: Set the choke lever (8):
For cold start to g
For warm start to e
– also use this position if the engine has been running but is still cold.
: Press fuel pump bulb (9) at least five
times even if bulb is filled with fuel.
393BA017 KN
393BA018 KN
: Put the unit on the ground:
It must rest securely on the engine support and deflector.
Check that the cutting tool is not touching the ground or any other obstacles.
: Make sure you have a firm footing.
: Hold the unit with your left hand on
the control handle and press it down firmly – your thumb should be under the control handle.
Do not stand or kneel on the drive tube! This could permanently damage the drive tube.
English / USA
: 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 the starter rope all the way – 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.
: Continue cranking until the engine
runs.
When engine begins to fire:
: Move choke lever to e
: Continue cranking.
355BA007 KN
As soon as engine runs:
: Blip the throttle trigger –
the slide control moves to the run position # – and the engine returns to idling speed.
Make sure carburetor is correctly adjusted – the cutting tool must not rotate when the engine is idling.
Your power tool is ready for operation.
21FS 75
English / USA
To shut down the engine:
: Push the slide control in the
direction of the arrow (h ) to
STOP-O.
Other points to observe when starting
At very low outside temperatures
As soon as engine runs:
: Blip the throttle trigger to disengage
the starting throttle position – the slide control moves to the run position # – and the engine settles down to idle speed.
: Allow engine to warm up for a brief
period at part throttle.
If the engine does not start
If you did not move the choke lever to e quickly enough after the engine began to fire, the combustion chamber is flooded.
: Move the choke lever to e
: Set the slide control, interlock lever
and throttle trigger to the starting throttle position.
10
: Start the engine by pulling the
starter rope briskly – 10 to 20 pulls may be necessary.
If the engine still does not start
: Push the slide control in the
direction of the arrow (h ) to STOP-O.
: Pull off the spark plug boot (10).
: Unscrew and dry off the spark plug.
: Open the throttle wide.
: Crank the engine several times with
the starter to clear the combustion chamber.
: Refit the spark plug.
: Connect the spark plug boot (press
it down firmly).
: Move the slide control to START. : Set the choke lever to e – even if
engine is cold.
: Now start the engine.
Throttle cable adjustment
: Check adjustment of throttle cable
– see "Adjusting the Throttle Cable".
393BA019 KN
Fuel tank run until dry
: After refueling, press the fuel pump
bulb at least five times – even if bulb is filled with fuel.
: Set the choke lever to suit the
engine temperature.
: Now start the engine.
22
FS 75

Operating Instructions Cleaning the Air Filter

During break-in period
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. As all moving parts have to bed in during the break-in period, the frictional resistances in the engine are greater during this period. The engine develops its maximum power after about 5 to 15 tank fillings.
During operation
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 engine­mounted components (ignition, carburetor) from thermal overload.
After finishing work
Wait for engine to cool down. Drain the fuel tank. Store the machine in a dry place. Check tightness of nuts and screws (not adjusting screws) at regular intervals and retighten as necessary.
Dirty air filters reduce engine power increase fuel consumption and make starting more difficult.
If there is a noticeable loss of engine power
: Move choke lever to g.
: Press in the tab (1).
: Ease the filter cover (2) over the tab
and take it away.
: Clean away loose dirt from around
the filter.
: Remove the foam and felt filter
elements.
1
English / USA
2
3
2
355BA014 KN
4
: Wash the foam element in a clean,
non-flammable cleaning solution (e.g. warm soapy water) and then dry.
: Fit new felt element.
As a temporary measure you can knock it out on the palm of your hand or blow it out with compressed air. Do not wash.
Replace damaged parts!
: Install the foam element (3) in the
filter cover (2).
: Place felt element (4) (lettering
facing inward) in filter housing (5).
: Fit filter cover so that it snaps into
position.
5
355BA031 KN
355BA032 KN
23FS 75
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