STIHL FS 45, 46
Instruction Manual Manual de instrucciones
Warning!
Read and follow all safety precautions in
Instruction Manual - improper use can cause serious or fatal injury.
Advertencia!
Lea y siga todas las precauciones de seguridad dadas en el manual de instrucciones - el uso incorrecto puede causar lesiones graves o mortales.
Contents
12.fm |
|
Guide to Using this Manual .............. |
2 |
|
|
Safety Precautions and |
|
||
_01 |
|
Working Techniques ......................... |
3 |
|
005_ |
|
Approved Combinations of |
|
|
011 |
|
Cutting Tool, Deflector, |
|
|
|
Handle and Harness |
16 |
||
SE_ |
|
|||
|
Mounting the Loop Handle |
17 |
||
_ |
|
|||
BA |
|
Mounting the Deflector |
18 |
|
|
|
|||
|
|
Mounting Cutting Tools ................... |
18 |
|
|
|
Fuel ................................................ |
21 |
|
|
|
Fueling ............................................ |
22 |
|
|
recycled. |
Starting / Stopping the Engine ........ |
23 |
|
|
Operating Instructions |
26 |
||
|
|
|||
|
|
Cleaning the Air Filter ..................... |
26 |
|
|
can be |
Motor Management ........................ |
27 |
|
|
Adjusting the Carburetor ................ |
27 |
||
|
paper |
Catalytic Converter ......................... |
29 |
|
|
Checking the Spark Plug |
29 |
||
|
oils; |
|||
|
Inspections and Maintenance by |
|
||
paper.free-chlorineon vegetablecontaininks |
STIHL Service |
30 |
||
|
|
|||
|
|
Rewind Starter ................................ |
30 |
|
|
|
Storing the Machine ........................ |
31 |
|
|
|
Replacing the Nylon Line ............... |
31 |
|
|
|
Replacing the Nylon Line ............... |
33 |
|
Printed |
Printing |
Maintenance Chart ......................... |
35 |
|
Parts and Controls |
36 |
|||
|
|
|||
|
|
Specifications ................................. |
38 |
|
|
|
Special Accessories ....................... |
39 |
|
|
|
Maintenance and Repairs ............... |
39 |
|
|
|
STIHL Incorporated |
|
|
|
|
Federal Emission |
|
|
200 |
|
Control Warranty Statement ........... |
40 |
|
|
STIHL Incorporated |
|
||
KG, P. |
|
|||
California Exhaust and |
|
|||
Co. HF. |
|
|||
Evaporative Emissions Control |
|
|||
AG & E8. |
|
|||
Warranty Statement ........................ |
42 |
|||
ANDREAS© STIHL |
23204588621 C. M |
STIHl |
44 |
|
|
|
Trademarks .................................... |
||
FS 45, FS 46
English / USA
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.
1
7.2
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:
:A bullet marks a step or procedure without direct reference to an illustration.
A description of a step or procedure that refers directly to an illustration may contain 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.
Caution where there is a risk of damaging the machine or its 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 may refer to several models with different features. Components that are not installed on all models and related applications are marked with an asterisk (*). Such components may be 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 some changes, modifications and improvements may not be covered in this manual.
2 |
FS 45, FS 46 |
Safety Precautions and
Working Techniques
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 instruction manual and
the safety precautions periodically. Careless or improper use may cause serious or fatal injury.
The terminology utilized in this manual when referring to the power tool reflects the type of cutting attachments that may be mounted on it. The term "trimmer" is used to designate an FS unit that is equipped with a nylon line head or a head with flexible plastic blades (i.e., the Polycut head). FS models with an "R" on the nameplate were originally configured (at the time of distribution) as a trimmer with a loop handle.
!Warning
As more fully explained later in these Safety Precautions, to reduce the risk of personal injury, make sure your unit is equipped with the proper handle, harness and deflector for the type of cutting attachment you are using. Use only cutting attachments that are specifically authorized by STIHL for use on your FS model. To reduce the risk of severe or fatal injury from blade contact and/or loss of control, never attempt to use a metal blade on this trimmer.
Have your STIHL dealer show you how to operate your power tool. Observe all applicable local safety regulations, standards and ordinances.
!Warning!
Do not lend or rent your power tool without the instruction manual. Be sure that anyone using it understands the information contained in this manual.
English / USA
!Warning!
The use of this machine may be hazardous. If the rotating line or blade 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 attachment. Thrown objects, including broken heads or polymer blades, may result in serious or fatal injury to the operator or bystanders.
Use your trimmer equipped with the appropriate cutting attachment only for cutting grass and similar material. It must not be used for any other purposes, since such misuse may result in an accident or damage to the machine.
!Warning!
Minors should never be allowed to use this power tool. Bystanders, especially children, and animals should not be allowed in the area where it is in use.
FS 45, FS 46 |
3 |
English / USA
!Warning!
To reduce the risk of injury to bystanders and damage to property, never let your power tool run unattended. When it is not in use (e.g. during a work break), shut it off and make sure that unauthorized persons do not use it.
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 instruction manual for a description of the controls and the function of the parts of your model.
Safe use of a trimmer involves
1.the operator
2.the power tool
3.the use of the power tool.
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 judgment. Do not operate this machine when you are fatigued.
!Warning!
Be alert – if you get tired, take a break. Tiredness may result in loss of control. Working with any power tool can be strenuous. If you have any condition that might be aggravated by strenuous work, check with your doctor before operating this machine.
!Warning!
Prolonged use of a power tool (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 machine to the operator's hands. An AV system is recommended for those persons using power tools on a regular or sustained basis.
Keep the AV system well maintained. A power tool 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 pressure. Wear gloves and keep your hands warm. 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 closely monitor the condition of their hands and fingers. If any of the above symptoms appear, seek medical advice immediately.
4 |
FS 45, FS 46 |
English / USA
!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 a 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 power tool will not protect the operator from all foreign objects (gravel, glass, wire, etc.) thrown back by the rotating cutting attachment. Thrown objects may also ricochet and strike the operator.
!Warning!
To reduce the risk of injury to your eyes never
operate your power tool unless wearing goggles or properly fitted protective 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 protective glasses.
!Warning!
Power tool 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.
Be particularly alert and cautious when wearing hearing protection because your ability to hear warnings (shouts, alarms, etc.) is restricted.
Always wear gloves when handling the machine, blade and the cutting attachment. Heavy-duty, nonslip gloves improve your grip and help to protect your hands.
Clothing must be sturdy and snug-fitting, but allow complete freedom of movement. Wear long pants made of heavy material to help protect your legs. Do not wear shorts, sandals or go barefoot.
Avoid loose-fitting jackets, scarfs, neckties, jewelry,
flared or cuffed pants,
unconfined long hair or anything that could become caught on
branches, brush or the moving parts of the unit. Secure hair so it is above shoulder level.
Good footing is very important. Wear sturdy boots with nonslip soles. Steel-toed safety boots are recommended.
FS 45, FS 46 |
5 |
English / USA
THE POWER TOOL
For illustrations and definitions of the power tool parts see the chapter on “Main Parts and Controls.”
!Warning!
Never modify this power tool in any way. Only attachments supplied by STIHL and expressly approved by STIHL for use with the specific STIHL model are authorized. Although certain unauthorized attachments are useable with STIHL power tools, their use may, in fact, be extremely dangerous. For the cutting attachments authorized by STIHL for your unit, see the chapter “Approved Combinations of Cutting Attachment, Deflector, Handle and Harness“ in the instruction manual or the STIHL “Power Tools and Accessories“ catalog.
If this tool is subjected to unusually high loads for which it was not designed (e.g. heavy impact or a fall), always check that it is in good condition before continuing work. Check in particular that the fuel system is tight (no leaks) and that the controls and safety devices are working properly. Do not continue operating this machine if it is damaged. In case of doubt, have it checked by your STIHL servicing dealer.
THE USE OF THE POWER TOOL Transporting the Power Tool
!Warning!
To reduce the risk of injury from loss of control and line contact, never carry or transport your power tool with the cutting attachment moving.
389BA019 KN |
It may be carried only in a horizontal position. Grip the shaft in a manner that the machine is balanced horizontally. Keep the hot muffler away from your body and the cutting attachment behind you.
!Warning!
Always shut off the engine and make sure the cutting attachment has stopped before putting a trimmer down. When transporting it in a vehicle, properly secure it to prevent turnover, fuel spillage and damage to the unit.
Fuel
Your STIHL power tool uses an oilgasoline mixture for fuel. For further instructions see the safety precautions and the chapter on “Fuel” of the instruction 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 the power tool. Note that combustible fuel vapor may escape from the fuel system.
6 |
FS 45, FS 46 |
English / USA
Fueling Instructions
!Warning!
Fuel your power tool 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 fuel tank depending on the fuel used, the weather conditions and the tank venting system.
In order to reduce the risk of burns and other personal injury from escaping gas vapor, remove the fuel filler cap on your power tool carefully so as to allow any pressure build-up in the tank to release slowly. Never remove the fuel filler cap while the engine is running.
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 machine.
!Warning!
Check for fuel leakage while refueling and during operation. If fuel leakage is found, do not start or run the engine until the leak is fixed and any 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 as securely as possible.
Before Starting
!Warning!
Always check your power tool for proper condition and operation before starting, particularly the throttle trigger, throttle trigger interlock, stop switch, cutting attachment and deflector. The throttle trigger must move freely and always spring back to the idle position. Never attempt to modify the controls or safety devices. Never use a power tool that is damaged or not properly maintained.
!Warning!
Do not attach any cutting attachment to a unit without proper installation of all required parts. Failure to use the proper parts may cause the head to fly off and seriously injure the operator or bystanders.
FS 45, FS 46 |
7 |
English / USA
!Warning!
The cutting attachment must be properly tightened and in safe operating condition. Inspect for loose parts (nuts, screws, etc.). Replace damaged heads before using the power tool.
Keep the handles clean and dry at all times; it is particularly important to keep them free of moisture, pitch, oil, grease or resin in order for you to maintain a firm grip and properly control your power tool.
!Warning!
Check that the spark plug boot is securely mounted on the spark plug – a loose boot may cause arcing that could ignite combustible fumes and cause a fire.
!Warning!
To reduce the risk of personal injury
to the operator from blade or line contact and
thrown objects, make sure your unit is equipped with the proper deflector, handle and harness for the type of cutting attachment being used (see chart in the chapter on "Approved Combinations of Cutting Attachment, Deflector, Handle and Harness").
Keep the deflector (and the attached skirt where appropriate) adjusted properly at all times (see chapters on "Mounting the Deflector" and "Mounting the Cutting Attachments" of your instruction manual).
Arrows on the deflector (as seen from the underside) show the correct direction of rotation of the cutting attachment. When viewed from above, however, the cutting attachment rotates counterclockwise.
Adjust the hand grip and harness (if you are wearing one) to suit your size before starting work. The machine should be properly balanced as specified in your instruction manual for proper control and less fatigue in operation.
Starting
Start the engine at least 10 feet (3 meters) from the fueling spot, outdoors only.
Start and operate your power tool without assistance. For specific starting instructions, see the appropriate section of your manual. Place the power tool on firm ground or other solid surface in an open area. Maintain good balance and secure footing.
!Warning!
To reduce the risk of injury from blade or line contact, be absolutely sure that the cutting attachment 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 move the cutting attachment.
Once the engine has started, immediately blip the throttle trigger, which should release the starting throttle and allow the engine to slow down to idle.
8 |
FS 45, FS 46 |
English / USA
With the engine running only at idle, attach the power tool to the spring hook of your harness if you are using one (see appropriate chapter of the instruction manual).
!Warning!
Your power tool is a one-person machine. Do not allow other persons in the general work area, even when starting.
!Warning!
To reduce the risk of injury from loss of control, do not attempt to “drop start” your power tool.
!Warning!
When you pull the starter grip, do not wrap the starter rope around your hand. Do not let the grip snap back, but guide the starter rope to rewind it properly. Failure to follow this procedure may result in injury to your hand or fingers and may damage the starter mechanism.
Important Adjustments
!Warning!
To reduce the risk of personal injury from loss of control or contact with the running cutting attachment, do not use your unit with incorrect idle adjustment. At correct idle speed, the cutting attachment should not move. For directions on how to adjust idle speed, see the appropriate section of your instruction manual.
If you cannot set the correct idle speed, have your STIHL dealer check your power tool and make proper adjustments and repairs.
During Operation
Holding and controlling the power tool
002BA054 KN
Always hold the unit firmly with both hands on the handles while you are working. Wrap your fingers and thumbs around the handles, keeping the handles cradled between your thumb and forefinger. Keep your hands in this position to have your power tool under control at all times. Make sure your trimmer handles and grips are in good condition and free of moisture, pitch, oil or grease.
FS 45, FS 46 |
9 |
English / USA
!Warning!
Never attempt to operate your power tool with one hand. Loss of control of
the power tool resulting in personal injury may result. To reduce the risk
of cut injuries, keep hands and feet away from the cutting attachment. Never touch a moving cutting attachment with your hand or any other part of your body.
!Warning!
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. For better footing, clear away scrub and cuttings. Be extremely cautious when working on slopes or uneven ground.
!Warning
To reduce the risk of injury from loss of control, never work on a ladder or on any other insecure support. Never hold the cutting attachment above waist height.
Working conditions
Operate and start your power tool only outdoors in a well ventilated area. Operate it under good visibility and daylight conditions only. Work carefully.
!Warning!
As soon as the engine is running, this product
generates toxic exhaust fumes containing chemicals such as unburned hydrocarbons
(including benzene) and carbon monoxide that are known to cause respiratory problems, cancer, birth defects, or other reproductive harm. Some of the gases (e.g. carbon monoxide) may be colorless and odorless. To reduce the risk of serious or fatal injury/illness from inhaling toxic fumes, never run the machine indoors or in poorly ventilated locations.
!Warning!
If the vegetation being cut or the surrounding ground is coated with a chemical substance (such as an active pesticide or herbicide), read and follow the instructions and warnings that accompanied the substance at issue.
!Warning!
Inhalation of certain dusts, especially organic dusts such as mold or pollen, can cause susceptible persons to have an allergic or asthmatic reaction. Substantial or repeated inhalation of dust and other airborne contaminants, in particular those with a smaller particle size, may cause respiratory or other illnesses. Control dust at the source where possible. Use good work practices, such as operating the unit so that the wind or operating process directs any dust raised by the power tool away from the operator. Follow the recommendations of EPA/OSHA/ NIOSH and occupational and trade associations with respect to dust (“particulate matter”). When the inhalation of dust cannot be substantially controlled, i.e., kept at or near the ambient (background) level, the operator and any bystanders should wear a respirator approved by NIOSH/ MSHA for the type of dust encountered.
10 |
FS 45, FS 46 |
English / USA
Operating instructions
!Warning!
Do not operate your power tool using the starting throttle lock, as you do not have control of the engine speed.
In the event of an emergency, shut off the engine immediately – move the slide control / stop switch to 0 or STOP.
15m (50ft)
15m (50ft)
The rotating cutting attachment may fling foreign objects directly or by ricochet a great distance.
To reduce the risk of eye and other injury always wear proper eye protection (see the chapter on “Proper Clothing“) and ensure that bystanders are at least 50 feet (15 m) away. To reduce the risk of damage to property, also maintain this distance from such objects as vehicles or windows. Any coworkers who must be in the restricted area should also wear goggles or protective glasses. Stop the engine immediately if you are approached.
!Warning!
Before you start work, examine the area for
stones, glass, fence wire,
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 power tool may be more difficult to control.
!Warning!
During cutting, check the tightness and the condition of the cutting attachment at regular short intervals with the engine and attachment stopped. If the behavior of the attachment changes during use, stop the engine immediately, wait until the cutting attachment stops, and check the nut securing the attachment for tightness and the head for cracks, wear and damage.
!Warning!
A loose head may vibrate, crack, break or come off the trimmer, which may result in serious or fatal injury. Make sure that the cutting attachment is properly tightened. Use the wrench supplied or one of sufficient length to obtain the proper torque. If the head loosens after being properly tightened, stop work immediately. The retaining nut may be worn or damaged and should be replaced. If the head continues to loosen, see your STIHL dealer. Never use a trimmer with a loose cutting attachment.
!Warning!
Replace a cracked, damaged or wornout head or a cracked, bent, warped, damaged, dull or worn out blade immediately, even if damage is limited to superficial cracks. Such attachments may shatter at high speed and cause serious or fatal injury.
!Warning!
If the head, blade or deflector becomes clogged or stuck, always shut off the engine and make sure the cutting attachment has stopped before cleaning. Grass, weeds, etc. should be cleaned off the blade or from around the head at regular intervals.
FS 45, FS 46 |
11 |
English / USA
!Warning!
To reduce the risk of unintentional rotation of the cutting attachment and injury, always shut off the engine and remove the spark plug boot before replacing the cutting attachment. To reduce the risk of injury, always shut off the engine before adjusting the length of the nylon line on manually adjustable mowing heads.
!Warning
The gearbox becomes hot during operation. To reduce the risk of burn injury, do not touch the gear housing when it is hot.
!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.
!Warning!
To reduce the risk of fire and burn injury, keep the area around the muffler clean. Remove excess lubricant and all debris such as pine needles, branches or leaves. Let the engine cool down sitting on concrete, metal, bare ground or solid wood away from any combustible substances.
!Warning!
Never modify your muffler. The muffler could be damaged and cause an increase in heat radiation or sparks, thereby increasing the risk of fire and burn injury. You may also permanently damage the engine. Have your muffler serviced and repaired by your STIHL servicing dealer only.
Catalytic converter
!Warning!
Some STIHL power tools 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 power tool 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.
!Warning!
An improperly mounted or damaged cylinder housing or a damaged/ deformed muffler shell may interfere with the cooling process 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.
12 |
FS 45, FS 46 |
English / USA
USING THE CUTTING ATTACHMENTS
For an illustration of the various cutting attachments and instructions on proper mounting see the chapter on "Mounting the Cutting Attachments" in your instruction manual.
!Warning!
To reduce the risk of severe or fatal injury from blade contact and/or loss of control, never attempt to use a metal blade on this trimmer.
Using the Mowing Heads
Do not use with mowing line longer than the intended length. With a properly mounted deflector, the built-in linelimiting blade will automatically adjust the line to its proper length.
Using the unit with an overly long nylon cutting line increases the load on the engine and reduces its operating speed. This causes the clutch to slip continuously and results in overheating and damage to important components (e.g. clutch, polymer housing components). Such damage could, among other things, cause the cutting attachment to rotate at idle.
000BA019 KN
Mowing heads are to be used only on trimmers equipped with a line-limiting blade in the deflector in order to keep the line at the proper length (see "Parts and Controls" chapter in your instruction 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 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 polymer 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 the operator or bystanders.
STIHL AutoCut mowing head
Nylon cutting cord advances automatically when tapped against the ground (TapAction)
STIHL PolyCut mowing head
For mowing unobstructed edges of meadows (without posts, fences, trees or similar obstacles). Uses either nylon lines or nonrigid, pivoting polymer blades.
!Warning!
Three wear limit marks are applied to the base (periphery) of the PolyCut. 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.
FS 45, FS 46 |
13 |
English / USA
1 |
KN |
|
002BA073 |
||
|
|
KN |
2 |
002BA074 |
|
Do not continue using the PolyCut if one of the circular holes (1; arrow) becomes visible or if the projecting rim (2; arrow) has worn away. Install a new mowing head.
!Warning!
If the wear limit marks are ignored, there is a risk of the cutting attachment shattering and flying parts injuring the operator or bystanders. To reduce the risk of accidents from shattered blades, avoid contact with stones, metal and similar solid objects. Check PolyCut blades for cracks at regular intervals. If a crack is found on one blade, always replace all blades.
STIHL FixCut mowing head
Uses pre-cut lengths of nylon line.
Observe wear indicators.
Do not continue using the mowing head if the raised moldings (1) on the base are missing or worn – see right illustration above. The mowing head may otherwise shatter and flying objects could result in injury to the operator or bystanders. Install a new mowing head.
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 make a warranty claim for a component which has not been serviced or maintained properly or if nonapproved replacement parts were used, STIHL may deny coverage.
!Warning!
Use only identical STIHL replacement parts for maintenance and repair. Use of non-STIHL parts may cause serious or fatal injury.
Strictly follow the maintenance and repair instructions in the appropriate sections of your instruction manual. Please refer to the maintenance charts respectively the maintenance notes in this manual.
!Warning!
Always stop the engine and make sure that the cutting attachment is stopped before doing any maintenance or repair work or cleaning the power tool. Do not attempt any maintenance or repair work not described in your instruction manual. Have such work performed by your STIHL servicing dealer only.
14 |
FS 45, FS 46 |
!Warning!
Use the specified spark plug, and make sure it and the ignition lead are always clean and in good condition. 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 securely attached.) A loose connection between the spark plug and the ignition wire connector in the boot may create arcing that could ignite combustible fumes and cause a fire.
!Warning!
Never test the ignition system with the spark plug boot removed from the spark plug or with a removed spark plug, since uncontained sparking may cause a fire.
!Warning!
Do not operate your power tool if the muffler is damaged, missing or modified. An improperly maintained muffler will increase the risk of fire and hearing loss. If your muffler was equipped with a spark-arresting screen to reduce the risk of fire, never operate your power tool if the screen is missing or damaged. Remember that the risk of forest fires is greater in hot or dry weather.
English / USA
!Warning!
Never attempt to repair damaged or broken heads. This may cause parts of the cutting attachment to come off and result in serious or fatal injuries.
Tighten all nuts, bolts and screws, except the carburetor adjustment screws, after each use.
Store the power tool in a dry and high or locked location out of reach of children.
Before storing for longer than a few days, always empty the fuel tank. See chapter "Storing the Machine" in the instruction manual.
FS 45, FS 46 |
15 |
English / USA
Approved Combinations of Cutting Tool, Deflector, Handle
and Harness
Cutting Tools
1STIHL AutoCut C 5-2 mowing head
2STIHL AutoCut 5-2 mowing head
3STIHL PolyCut 6-3 mowing head
4STIHL FixCut 5-2 mowing head
Deflector
5Deflector with line limiting blade for mowing heads only (see “Mounting the Deflector”)
Handle
6 Loop handle
Harness/Shoulder Strap
7 Shoulder strap may be used
Equipment
The complete trimmer includes:
–Cutting tool
–Deflector
–Handle
–Shoulder strap (special accessory)
Select the correct combination from the table according to the cutting tool you intend to use. Read the table horizontally from left to right.
Warning!
To reduce the risk of injury from thrown objects or blade contact, never operate your unit without the proper deflector for the cutting attachment being used. To reduce the risk of injury from loss of control and / or contact with the cutting tool, make sure your unit is equipped with a proper handle for the type of cutting attachment being used.
Warning!
Only mowing heads (1, 2, 3, 4) may be used on loop-handled trimmers with a curved drive tube.
To reduce the risk of accidents and injury, avoid contact with the rotating cutting tool.
Cutting Tools |
Deflector |
Handle |
Shoulder Strap |
1 |
5 |
|
|
213681FKKN |
|
|
|
|
|
|
|
3 |
KN |
6 |
|
|
|
||
|
681FK028 |
|
7 |
|
|
|
|
4 |
|
|
|
002BA125 KN
16 |
FS 45, FS 46 |
English / USA
Mounting the Loop Handle
|
|
A |
|
KN |
|
1 |
|
223BA017 |
|
|
|
|
|
2 |
|
|
6 |
|
|
|
5 |
3 |
|
|
|
|
|
223BA018 KN |
|
4 |
232BA069 KN |
|
|
Adjusting loop handle to most comfortable position
:Loosen the wingnut (6).
:Slide or rotate the loop handle (1) on the drive tube as required.
:Tighten the wingnut (6).
: Place friction liner in the loop handle |
: |
Fit the loop handle (1) on the drive |
|
|
tube, approx. 20 cm (8 in) (A) |
|
|
forward of the control handle (2). |
|
: |
Push the spacer (3) (not all markets) |
|
|
into the loop handle until it fits |
|
|
snugly. |
|
: |
Insert the screw (4) through the loop |
|
|
handle and the spacer so that the |
|
|
screw head locates in the hexagon |
|
|
recess. |
: Fit the washer (5) and wingnut (6) and tighten down firmly.
FS 45, FS 46 |
17 |
English / USA |
|
Mounting the Deflector |
Mounting Cutting Tools |
2
1 
KN232BA066
4
3 |
KN |
|
232BA067 |
:Push the deflector (1) over the clamp (2).
:Insert nut (3) in the hex recess in the deflector.
:Make sure the holes line up.
:Fit screw (4) and tighten it down firmly.
232BA026 KN |
Preparations |
:Lay your trimmer on its back with the loop handle and shroud pointing down and the output shaft facing up.
1
3
2
4
232BA033 KN
Thrust Plate
The thrust plate is shipped with the Polycut 6-3 and FixCut 5-2. It is only required for these mowing heads.
AutoCut 5-2 mowing head AutoCut C 5-2 mowing head
:Pull the thrust plate (1) (if fitted) off the shaft (2).
STIHL PolyCut 6-3 mowing head, STIHL FixCut 5-2 mowing head
:Slip the thrust plate (1) over the shaft (2) and engage hexagon recess (3) on external hexagon (4).
18 |
FS 45, FS 46 |
English / USA
4
2 |
3 |
|
1 |
|
KN |
3 |
232BA054 |
|
Mounting the Mowing Head
Keep instruction sheet for mowing
head in a safe place.
Assembling STIHL AutoCut 5-2
:Fit the spring (1) in the head (2).
All other steps are described in the instruction sheet provided.
:Wind the nylon lines (3) onto the spool (4).
:Thread the ends of the nylon lines through the sleeves and place the spool in the head.
8
2
7
5
6 
232BA053 KN
STIHL AutoCut 5-2
:Push the mowing head (2) over the shaft (5) and engage the hex recess (7) on the external hexagon (6).
:Place the cap (8) on the head – turn it clockwise as far as stop and then tighten it down firmly.
8 
2 ES
2 |
9 |
Schnur/LINE |
|
|
1 |
681BA018 KN
STIHL AutoCut C 5-2
:Push the mowing head (2) over the shaft – as with the AutoCut 5-2.
:Screw the spool (9) into the head until the two arrow points are in alignment (see illustration) – secure the spool in this position.
:Push the cap (8) into the spool as far as stop, turning it clockwise at the same time.
:Turn cap as far as stop and tighten
it down by hand.
FS 45, FS 46 |
19 |
English / USA
10 |
11 |
5 |
681BA019 KN |
STIHL Polycut 6-3 |
:Fit the thrust plate on the shaft.
:Insert mounting nut (10) in the mowing head.
:Screw mowing head (11) clockwise onto the shaft (5) as far as stop.
:Block the output shaft with the stop pin.
:Tighten down the mowing head.
Remove the tool used to block the shaft.
Blocking the shaft
:Block the shaft by pushing the stop pin (12) through the holes (13) in the deflector and thrust plate – turn the thrust plate back and forth if necessary.
:Tighten down the mowing head firmly.
Remove the tool used to block the shaft.
5 |
|
|
4 |
|
|
3 |
|
|
1 |
|
KN |
|
|
|
|
2 |
232BA074 |
|
|
|
STIHL FixCut 5-2 |
|
|
:Fit the thrust plate (2) on the shaft.
:Place the mowing head on the thrust plate (2).
Collar (arrow) must locate in the mowing head’s mounting hole.
:Push the thrust washer (3) over the shaft (1) so that it locates against the base.
:Block the output shaft.
:Use the combination wrench (5) to screw the mounting nut (4) counterclockwise onto the output shaft and it tighten down firmly.
Remove the tool used to block the shaft.
20 |
FS 45, FS 46 |
English / USA
Fuel
2 |
1 |
232BA007 KN |
Adjusting Nylon Line
STIHK AutoCut
:old the rotating cutting head horizontal to the ground – tap it on the ground – about 1 1/4" (3 cm) 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.
Line feed operates only if both lines still have a minimum length of 1" (2.5 cm).
Removing the Mowing Head
STIHL AutoCut
:Hold the mowing head steady and unscrew the cap counterclockwise.
STIHL PolyCut
:Block the shaft.
:Unscrew the mowing head counterclockwise.
STIHL FixCut
:Block the shaft.
:Use the combination wrench to loosen and unscrew the mounting nut clockwise from the output shaft.
If the mounting nut is too loose, fit a new one.
Replacing Nylon Line / Cutting Blades
STIHL AutoCut
See chapter on "Replacing Nylon Line".
STIHL PolyCut, FixCut
Refer to 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 engine requires a mixture of highquality 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!
FS 45, FS 46 |
21 |
English / USA
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.
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.
Gaso- |
Oil (STIHL 50:1 or |
|
line |
equivalent high-quality oils) |
|
US gal. |
US fl.oz |
|
|
1 |
2.6 |
2 1/2 |
6.4 |
|
5 |
12.8 |
|
Dispose of empty mixing-oil canisters only at authorized disposal locations.
Fueling
232BA046 KN
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.
22 |
FS 45, FS 46 |
Starting / Stopping
the Engine
3 1 2
4
|
5 |
7 6 |
KN |
|
232BA064 |
Controls
Stop switch (1) with positions: I - normal run position (2) and O - stop (3).
Throttle trigger interlock (4).
Throttle trigger (5) with tongue (6) and catch (7).
6
232BA065 KN
Starting
:Move the stop switch to position I.
:Press down the throttle trigger interlock and hold it there.
:Squeeze the throttle trigger until the catch on the tongue (6) can be engaged in the housing (arrow).
:Now release the throttle trigger, tongue and throttle trigger interlock in that order. This is the starting throttle position.
English / USA
9
8
232BA011 KN
: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.
FS 45, FS 46 |
23 |
English / USA
232BA012 KN
232TI013 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 and press it down firmly – your thumb should be under the housing.
Do not stand or kneel on the drive tube!
232BA014 KN |
Standard versions:
: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.
Versions with ErgoStart:
:Pull the starter grip slowly with your right hand until you feel the first stop
– and then pull it out slowly and steadily.
Do not pull out the starter rope to its full length – it might break.
:Do not let the starter grip snap back. Guide it slowly back into the housing so that the starter rope can rewind properly.
8
232TI015 KN
:Continue cranking until engine runs.
:After no more than 5 pulls, move the choke lever eand continue cranking.
As soon as the engine runs
:Squeeze throttle until the tongue disengages – the engine will settle down to idle speed.
Make sure the carburetor is
correctly adjusted – the cutting tool must not rotate when the engine is idling.
Your machine is now ready for operation.
24 |
FS 45, FS 46 |
To shut down the engine:
:Move the stop switch to O.
If the engine does not start
Choke lever
If you did not move the choke lever to e quickly enough after the engine began to fire, the combustion chamber has flooded.
:Set the choke lever to e
:Move stop switch to I, interlock lever and throttle trigger to starting throttle position.
:Start the engine by pulling the starter rope firmly. 10 to 20 pulls may be necessary.
If the engine still does not start
10 |
232BA048 KN |
:Move stop switch to O.
:Pull off the spark plug boot (10).
English / USA
: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 – push it down firmly.
:Move the stop switch to I
:Set choke lever to e
– even if engine is cold.
:Now start the engine.
Fuel tank run until dry
:After refueling, press the fuel pump bulb at least fives times even if the bulb is filled with fuel.
:Set the choke lever according to engine temperature.
:Now start the engine.
FS 45, FS 46 |
25 |
English / USA
Operating Instructions
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.
Cleaning the Air Filter
2
1
232BA017 KN
Dirty air filters reduce engine power increase fuel consumption and make starting more difficult.
If there is a noticeable loss of engine power
:Set choke lever to g
:Press in the tab (1) and swing the filter cover (2) open.
:Clean away loose dirt from around the filter.
4 |
3 |
232BA018 KN |
:Remove the felt filter element (3).
:Do not wash the felt element. Fit a new one. As a temporary measure, clean it by knocking it out on the palm of your hand or blowing it out with compressed air.
Replace damaged parts of filter.
:Place the felt element (3) in the filter housing (4).
:Close the filter cover so that it snaps into position.
26 |
FS 45, FS 46 |
English / USA
Motor Management |
Adjusting the Carburetor |
Exhaust emissions are controlled by the design of the fundamental engine parameters and components (e.g. carburation, ignition, timing and valve or port timing) without the addition of any major hardware.
H |
L |
3 /4 |
1 |
|
LA |
|
233BA028 KN |
The carburetor comes from the factory with a standard setting.
This setting provides an optimum fuel-air mixture under most operating conditions.
With this carburetor it is only possible to adjust the engine idle speed within fine limits.
Standard Setting
:Shut off the engine.
:Mount the cutting tool.
:Check the air filter and replace if necessary.
:Turn high speed screw (H) counterclockwise (max. 3/4 turn) as far as stop.
:Carefully screw the low speed screw (L) down onto its seat. Then open it one turn counterclockwise
:Start and warm up the engine.
:Adjust idle speed with the idle speed screw (LA) so that the cutting tool does not rotate.
Fine Tuning
A slight correction of the setting of the high speed screw (H) may be necessary if engine power is not satisfactory when operating at high altitude or at sea level.
FS 45, FS 46 |
27 |
English / USA
Rule of thumb
Turn high speed screw (H) about 1/4 turn over for every 1000m (3.300 ft) change in altitude.
Conditions for adjustment
Carry out adjustment with nylon line mowing head, making sure the cutting lines are at full length (as far as limiter blade on deflector).
:Carry out standard setting without changing the high speed screw (H).
:Warm up engine for about 3 minutes.
:Open the throttle wide.
At high altitudes
:Turn the high speed screw (H) clockwise (leaner) no further than stop until there is no noticeable increase in engine speed.
At sea level
:Turn the high speed screw (H) counterclockwise (richer) no further than stop until there is no noticeable increase in engine speed.
it is possible that maximum engine speed will already be reached with the standard setting in each case.
Adjusting Idle Speed
It is usually necessary to change the setting of the idle speed screw (LA) after every correction to the low speed screw (L).
:Warm up engine.
Engine stops while idling
:Turn idle speed screw (LA) slowly clockwise until the engine runs smoothly – cutting tool must not rotate.
Cutting tool rotates when engine is idling
:Turn idle speed screw (LA) slowly counterclockwise until cutting tool
stops rotating and then turn the screw about another 1/2 to 1 turn in the same direction.
Erratic idling behavior, engine stops even though setting of LA screw is correct, poor acceleration
Idle setting too lean:
:Turn low speed screw (L) counterclockwise (about 1/4 turn) until the engine runs and accelerates smoothly.
Erratic idling behavior
Idle setting too rich:
:Turn low speed screw (L) clockwise (about 1/4 turn) until the engine runs and accelerates smoothly.
28 |
FS 45, FS 46 |
Loading...