Stihl FSA 45 Manual

Introduction

The information contained in this manual will help you receive maximum performance and satisfaction from your trimmer and, if followed, reduce the risk of injury from its use.
SAVE THIS MANUAL!
Because a trimmer is a high-speed cutting tool, special safety precautions must be observed to reduce the risk of personal injury.

Read this instruction manual thoroughly before use and periodically thereafter. Follow all safety precautions. Careless or improper use of the trimmer can cause serious or fatal injury.
Do not lend or rent the trimmer without this instruction manual. Allow only persons who fully understand the information in this manual to operate the trimmer.
For further information, or if you do not understand any of the instructions in this manual, please go to www.stihl.ca or contact your authorized STIHL servicing dealer.

Guide to Using this Manual

Signal Words

This manual contains safety information that requires your special attention. Such information is introduced with the following symbols and signal words:

• Indicates a hazardous situation which, if not avoided, will result in death or serious injury.

• Indicates a hazardous situation which, if not avoided, could result in death or serious injury.

• Indicates a risk of property damage, including damage to the machine or its individual components.

Symbols in Text

The following symbol is included to assist you with the use of the manual:
Refers to a designated chapter or sub-chapter in this instruction manual.

Main Parts

Trimmer and Charger

The trimmer is powered by an integrated lithium ion battery that cannot be removed from the power tool.

1. Control Handle
   Handle for the operator's rear hand.
2. Trigger Switch Lockout
   Must be depressed while the retaining latch is unlocked to allow activation of the trigger switch.
3. Retaining Latch
   Locks/unlocks the trigger switch.
4. Activation Key
   Enables the flow of electrical power from the integrated battery to the motor.
5. Activation Key Socket
   Socket for connecting the activation key to the trimmer.
6. Star Knob
   Tightens the loop handle in position.
7. Housing
   Contains the integrated battery.
8. Drive Tube Release Button
   Unlocks the drive tube to allow length adjustment and conversion for edging.
9. Loop Handle
   Handle for the operator's front hand.
10. Trimmer LEDs
    Indicate the trimmer's state of charge and display error messages regarding potential malfunctions in the power tool or its integrated battery.
11. Push Button
    Activates the trimmer's LEDs.
12. Charging Socket
    Socket for connecting the charger to the trimmer.
13. Trigger Switch
    Activates the cutting attachment when depressed.
14. Drive Tube
    Trimmer shaft.
15. Trimmer Head Adjustment Latch
    Allows the angle of the trimmer head to be adjusted for edging.
16. Bump Guard
    Limits the cutting range of the mowing line and helps regulate cutting depth during edging.
17. Connector
    Connects the charger to the trimmer's charging socket.
18. Power Supply Cord
    Supplies electrical charging current when the charger is plugged into an electrical outlet.
19. Plug
    Connects the charger to an electrical outlet.
20. Charger (Power Supply)
    Power supply for charging the trimmer.

# Rating Plate
Contains electrical information and the product's serial number.

Mowing Head, Cutting Attachments and Deflector

1. Deflector
   Designed to reduce the risk of injury from thrown objects and contact with the cutting attachment.
2. Line Limiting Blade
   Metal blade on the deflector that trims the nylon mowing line to the proper length.
3. Polymer Blade
   Rigid cutting attachment for trimming grass and similar material.
4. Mounting Post
   Post on each side of the mowing head for mounting the polymer blades.
5. Trimmer Line
   Nylon cutting attachment for trimming grass and similar material.
6. PolyCut 2-2 Mowing Head
   The mowing head for mounting nylon trimmer line or polymer blades.

Safety Symbols on the Products

Trimmer and Charger

The following safety symbols are found on the trimmer and/or charger:

	To reduce the risk of injury, follow the specified safety precautions.
	Read and follow all safety precautions in the instruction manual. Improper use can lead to serious or fatal personal injury or property damage.
	To reduce the risk of eye injury, always wear proper eye protection.
	To reduce the risk of personal injury from thrown objects, inspect the work area and remove stones, pieces of metal and other objects that could be thrown by the cutting attachment.
	To reduce the risk of personal injury from thrown objects, keep bystanders at least 50 ft. (15 m) away.
	To reduce the risk of injury or property damage from unintended activation, remove the activation key any time the trimmer is not in use,
	To reduce the risk of personal injury or property damage from a short circuit, fire or explosion, keep the trimmer dry. Protect it from rain, water, liquids and damp conditions. Never immerse the trimmer in water or other liquids.
	To reduce the risk of personal injury or property damage from fire, explosion or burns, including chemical burns, do not disassemble the trimmer's hous‐ ing. Never crush, drop, damage or heat the trimmer above 212°F (100°C), expose it to fire or incinerate.
	To reduce the risk of personal injury or property damage from fire, use and store the trimmer only within an ambi‐ ent temperature range of 32°F to 122°F (0°C to 50°C).
	To reduce the risk of personal injury or property damage from fire or electric shock, keep the charger dry. Protect it from rain, water, liquids and damp con‐ ditions. For indoor use only.

IMPORTANT SAFETY INSTRUCTIONS

General Safety Warnings and Instructions

This section contains the prescribed general safety warnings and instructions for handheld, motor-operated electric trimmers. Additional important warnings and instructions are provided in subsequent sections of this manual.

• When using electric trimmers, basic safety precautions should always be followed to reduce the risk of fire, electric shock and personal injury, including the following:

READ ALL INSTRUCTIONS BEFORE USING THE TRIMMER!

1. Avoid Dangerous Environment – Don't use trimmers in damp or wet locations.
2. Don't Use In Rain.
3. Keep Children Away – All bystanders should be kept at a distance from work area.
4. Dress Properly – Do not wear loose clothing or jewelry. They can be caught in moving parts. Heavy-duty work gloves (e.g. made of leather or other wear resistant material) and substantial footwear are recommended when working outdoors. Wear protective hair covering to contain long hair.
5. Use Safety Glasses – Always use face or dust mask if operation is dusty.
6. Use Right Tool – Do not use tool for any job except that for which it is intended.
7. Avoid Unintentional Starting – Do not carry trimmer with finger on the trigger switch.
8. Don't Force Trimmer – It will do the job better and with less likelihood of a risk of injury at the rate for which it was designed.
9. Don't Overreach – Keep proper footing and balance at all times.
10. Stay Alert – Watch what you are doing. Use common sense. Do not operate trimmer when you are tired.

11. Store Trimmer Indoors – When not in use, trimmer should be stored indoors in a dry, locked place out of reach of children with the activation key removed.
12. Maintain Trimmer With Care – Keep cutting attachment clean for best performance and to reduce the risk of injury. Follow instructions for changing accessories. Keep handles dry, clean, and free from oil and grease.
13. Check Damaged Parts – Before further use of the trimmer, a guard or other part that is damaged should be carefully checked to determine that it will operate properly and perform its intended function. Check for alignment of moving parts, binding of moving parts, breakage of parts, mounting, and any other condition that may affect its operation. A guard or other part that is damaged should be properly repaired or replaced by an authorized service center unless indicated elsewhere in this manual.
14. Keep guards in place and in working order.
15. Keep hands and feet away from cutting area and cutting attachment.

SAVE THESE INSTRUCTIONS

Intended Use

• This trimmer is designed for light duty cutting of grass and similar material in yards and gardens around the home. Use of the trimmer for operations different than intended could result in serious injury or death.
  • Use the trimmer only for light-duty trimming tasks around the home and garden.
  • Cut grass and similar material only. Do not use the trimmer for cutting shrubs, bushes or other types of heavy vegetation.
• Improper use could result in personal injury or property damage, including damage to the trimmer.
  • Use the trimmer and charger only as described in this manual.
  • Never attempt to modify or override the trimmer's controls or safety devices in any way.
  • Never use a trimmer that has been modified or altered from its original design.
• The LK 45 charger (power supply) is designed for charging STIHL HSA 45, FSA 45 and BGA 45 power tools only.

Operator

• Working with the trimmer can be strenuous. The operator must be in good physical condition and mental health. To reduce the risk of personal injury:
  • Check with your doctor before using the trimmer if you have any health condition that may be aggravated by strenuous work.
  • Do not operate the trimmer while under the influence of any substance (drug, alcohol or medication, etc.) that might impair vision, balance, dexterity or judgment.
  • Be alert. Do not operate the trimmer when you are tired. Take a break if you become tired.
  • Do not permit minors to use the trimmer.
• According to STIHL's current knowledge, the electric motor of this trimmer should not interfere with a pacemaker.
  • However, persons with a pacemaker or other implanted medical device should consult their physician and device manufacturer before operating this trimmer.

Personal Protective Equipment

• Even a properly installed and adjusted deflector may not protect the operator from all foreign objects thrown back by the cutting attachment. Thrown objects may also ricochet and strike the operator. To reduce the risk of personal injury:
  • Always wear proper clothing and protective apparel, including proper eye protection.
• Loss of control and severe cut injuries may result if hair, clothing or apparel make contact with the moving cutting attachment or otherwise become entangled in the components of the trimmer. To reduce the risk of severe personal injury:
  • Wear sturdy and snug-fitting clothing that also allows complete freedom of movement.
    
  • Wear overalls or long pants made of heavy material to help protect your legs. Do not wear shorts.
  • Avoid loose-fitting jackets, scarves, neckties, flared or cuffed pants, jewelry and any other apparel that could be caught on branches, brush or the moving cutting attachment.
  • Secure hair above shoulder level before starting work.
• To reduce the risk of eye injury:
  • Always wear goggles or close-fitting protective glasses with adequate side protection that are impact-rated and marked as complying with CSA Z94.
    
  • If there is a risk of facial injury, STIHL recommends that you also wear a face shield or face screen over your goggles or protective glasses.
• To reduce the risk of head injury:
  • Wear an approved protective helmet when there is a risk of head injury.
• Good footing is very important. To help maintain a secure footing and reduce the risk of injury while working:
  • Wear substantial footwear with nonslip soles. Do not wear sandals, flipflops, open-toed or similar footwear.
    
• To improve your grip and help protect your hands:
  • Always wear heavy-duty non-slip work gloves made of leather or another wear-resistant material when handling the trimmer.
    

Trimmer

• To reduce the risk of electric shock:
  
  • Do not expose the trimmer to rain, water or excessive moisture.
  • Store the trimmer indoors.
  • Never immerse the trimmer in water or other liquids.
• If the moving cutting attachment contacts you, it will result in serious laceration injuries. To reduce the risk of such injuries:
  • Keep hands, feet and other parts of your body away from the cutting attachment.
  • Never touch the moving cutting attachment with your hand or any other part of your body.
  • Never operate the trimmer with a damaged or missing deflector.
• This battery-powered trimmer is intended only for light-duty garden and landscape maintenance around the home. Use for other purposes may increase the risk of personal injury and property damage.
  • Cut grass and similar material only. Do not use the trimmer for cutting brush, shrubs, bushes or other types of heavy vegetation.
  • Read and follow the operating instructions in this manual for approved applications.
• To reduce the risk of personal injury to the operator and bystanders:
  • Always release the trigger switch and remove the activation key before assembling, transporting, adjusting, inspecting, cleaning, servicing, maintaining or storing the trimmer, and any other time it is not in use.
    
• Although certain unauthorized attachments may fit your STIHL trimmers, their use may be extremely dangerous. Only attachments supplied by STIHL or expressly approved by STIHL for use with this specific model are recommended.
  • Use only attachments supplied or expressly approved by STIHL.
  • Never attempt to mount a metal blade for use on the trimmer.
  • Never modify this trimmer in any way.
  • Never attempt to modify or override the trimmer's controls or safety devices in any way.
  • Never use a trimmer that has been modified or altered from its original design.
• If the trimmer is dropped or subjected to similar heavy impacts:
  • Check that it is undamaged, in good condition and functioning properly before continuing work.
  • Check that the controls and safety devices are working properly.
• If the trimmer is damaged, not working properly, has been left outdoors, exposed to rain or damp conditions or dropped into water or other liquid, its components, including its integrated battery, may no longer function properly and safety devices may be inoperative. To reduce the risk of personal injury and property damage:
  • Take the trimmer to your authorized STIHL servicing dealer to be checked before further operation.
• Genuine STIHL replacement parts are specifically designed to match your trimmer and meet safety and performance requirements. Use of parts that are not authorized or approved by STIHL may cause serious or fatal injury or property damage.
  • STIHL recommends that only identical STIHL replacement parts be used.

Integrated Battery

• Use of an unauthorized charging device can damage the lithium ion battery inside the trimmer and result in fire, explosion and personal injury and property damage.
  • Charge the trimmer only with a genuine STIHL LK 45 charger (power supply).
• The trimmer's integrated battery contains safety features and devices which, if damaged, may allow it to generate heat, rupture, leak, ignite or explode.
  • Be alert for signs that the battery may be damaged: never use or charge a trimmer with a housing that is cracked, deformed, excessively hot, leaking battery fluid or otherwise damaged.
  • Never attempt to remove the battery or open or disassemble the trimmer's housing for any reason.
  • Never subject the trimmer to heavy impacts or attempt to crush, drop or otherwise damage it.
  • Never heat the trimmer above 212°F (100°C) or place it on or near fires, stoves or other high-temperature locations.
    
  • Never expose the trimmer to microwaves or high pressures.
  • Never insert foreign objects into the trimmer's charging socket, activation key socket or other openings.
• High temperatures may cause the trimmer's integrated battery to generate heat, rupture, leak, ignite or explode, resulting in severe or fatal personal injury and property damage. Exposure to temperatures outside the recommended temperature range may also damage the battery.
  • Use and store the trimmer only within an ambient temperature range of 32°F to 122°F (0°C to 50°C).
    
• To reduce the risk of personal injury and property damage in the event the trimmer emits smoke, an unusual smell or feels unusually hot while using, charging or storing:
  • Immediately discontinue using or charging the trimmer and prepare to contact the authorities in the event of fire or explosion.
• To reduce the risk of electric shock:
  • Never bridge the electrical contacts of the activation key socket with wires or other small metal objects capable of conducting electricity (e.g., paper clips, nails, coins, keys).
  • Keep the trimmer dry. Protect it from rain and ensure that the trimmer and its battery are never exposed to water, liquids or damp conditions.
    
  • Never immerse the trimmer in water or other liquids.
  • Store the trimmer indoors in a dry room.
  • Never store the trimmer in damp or corrosive environments or in conditions that could lead to corrosion of its metal components or battery.
  • Protect the trimmer from exposure to corrosive agents such as garden chemicals and de-icing salts, which may damage its battery and increase the risk of short circuit, fire and explosion.
  • Do not attempt to repair, open or disassemble the trimmer. There are no user-serviceable parts inside.
• If the integrated battery is damaged, battery fluid can leak out of the trimmer. Leaking battery fluid can cause skin and eye irritation or chemical burns.
  • Avoid contact with skin and eyes.
  • Use an inert absorbent such as sand on spilled liquids.
  • In the event of accidental contact, immediately rinse the contact area thoroughly with mild soap and water.
  • If fluid gets into your eye(s): Do not rub. Rinse water over the open eye(s) for at least 15 minutes and seek medical attention.
• A battery fire can be dangerous. To reduce the risk of severe personal injury and property damage in the event of fire:
  • Evacuate the area. Fire can spread rapidly. Stay clear of any vapors generated and maintain a safe distance.
  • Contact the fire department.
  • Although water can be used to put out a battery fire, use of a multi-purpose dry chemical fire extinguisher is preferable.
  • Consult the fire department regarding proper disposal of the burned battery.

Using the Trimmer

Before Operation

• Misuse or unauthorized use may result in personal injury and property damage.
  • Use the trimmer only as described in this instruction manual.
• For proper assembly of the cutting attachment, deflector and handle:
  • Read and follow the instructions on mounting the cutting attachment, deflector and handle.
• The cutting attachment and deflector must be an approved combination. Before replacing:
  • Read and follow the instructions on selecting the proper cutting attachment and deflector.
• The cutting attachment must be properly installed and tightened before starting work. Failure to use the proper parts to mount the cutting attachment may cause the head to fly off and seriously injure the operator or bystanders.
  • Never mount a cutting attachment to the trimmer without the proper installation of all required parts (e.g., nuts, screws, thrust washer, thrust plate, etc.).
  • Before starting work, inspect for loose parts (nuts, screws, etc.) and for cracked or damaged heads. Ensure the mowing head is tightened firmly.
  • Replace damaged or worn out heads before using the power tool.
• Using only the approved combination of cutting attachment and deflector is extremely important to maximize cutting performance and reduce the risk of personal injury from thrown objects or contact with the cutting attachment:
  • To reduce the risk of serious injury, never use wire or metal-reinforced line or other material in place of the recommended nylon cutting line. Pieces of wire could break off and be thrown at high speed toward the operator or bystanders.
• Using a trimmer that is modified, damaged, improperly adjusted or not completely and securely assembled can lead to a malfunction and increase the risk of serious personal injury or death.
  • Never operate a trimmer that is modified, damaged, improperly maintained or not completely and securely assembled.
  • Always check your trimmer for proper condition and operation, particularly the retaining latch, trigger switch lockout, trigger switch, deflector and cutting attachment.
  • Ensure that the retaining latch, trigger switch lockout and trigger switch move freely and spring back into place when released. The trigger switch must not engage until the retaining latch is unlocked and the trigger switch lockout is depressed.
  • Never attempt to modify or override the controls or safety devices.
  • The cutting attachment must engage only when the activation key is inserted, the retaining latch is unlocked and the trigger switch lockout and trigger switch are depressed.
  • If your trimmer or any part is damaged or does not function properly, take it to your authorized STIHL servicing dealer. Do not use the trimmer until the problem has been corrected.
• Before inserting the activation key:
  • Check the electrical contacts of the activation key and activation key socket for corrosion or other foreign matter. Keep clean.
  • Never insert a damaged, deformed or corroded activation key.
  • Read and follow the instructions on switching on the trimmer.
• To help reduce the risk of serious personal injury or death from unintentional starting:
  • Be sure the retaining latch is in the locked position before inserting the activation key.
  • Never carry the trimmer with your finger on the trigger switch.
  • Release the trigger switch before removing the activation key.
  • Remove the activation key before assembling, transporting, adjusting, inspecting, cleaning, servicing, maintaining or storing the trimmer, and any other time it is not in use.
    
  • Never leave the trimmer unattended when the activation key is inserted.
  • Never store the activation key in the trimmer.
• Before switching on your trimmer, take the following steps to reduce the risk of personal injury from thrown objects, loss of control or inadvertent contact with the cutting attachment:
  • Be sure that the cutting attachment is clear of you and all other obstructions and objects, including the ground.
  • Read and follow the instructions on switching on the trimmer.

Holding and Controlling the Trimmer
When trimming

When edging

• To maintain a firm grip and properly control your trimmer:
  • Keep the handles clean and dry at all times. Keep them free of moisture, pitch, oil, grease and resin.
• To reduce the risk of serious or fatal injuries to the operator or bystanders from loss of control:
  • Always hold the trimmer firmly with both hands when you are working.
  • Wrap your fingers tightly around the handles, keeping the handles cradled between your thumb and forefinger (see illustration).
  • Position the trimmer in such a way that all parts of your body are clear of the cutting attachment whenever the activation key is inserted.
• Working with the cutting attachment above ground level or perpendicular to the ground increases the risk of severe injury from thrown objects. It also exposes more of the cutting attachment and makes the trimmer more difficult to control, increasing the risk of injury. To reduce the risk of serious or fatal injury from loss of control or thrown objects when trimming:
  • Keep the cutting attachment at ground level, parallel to the ground.
• Always adjust the drive tube position and trimmer head angle before using the unit for edging. To reduce the risk of serious or fatal injury from loss of control or thrown objects when the trimmer is converted in this manner:
  • Always hold the control handle with your right hand and the loop handle with your left hand (see illustration).
  • Keep the drive tube and cutting attachment to the right side of your body while working, ensuring that the deflector is positioned between the cutting attachment and your body at all times
  • Always adjust the position of the loop handle and length of the drive shaft to suit your height and reach. Always maintain a comfortable and effective working position.
• To reduce the risk of serious or fatal cut injuries to the operator or bystanders from contact with the cutting attachment:
  • Keep hands, feet and other body parts away from the cutting attachment.
    
  • Never touch a moving cutting attachment with your hand or any other part of your body
  • Do not touch the cutting attachment while the activation key is inserted.
• Operating the trimmer with one hand may lead to loss of control and is extremely dangerous. To reduce the risk of serious or fatal injury to the operator or bystanders from loss of control:
  • Never attempt to operate the trimmer with one hand.
    
• To reduce the risk of serious or fatal cut injuries to the operator or bystanders from loss of control, keep proper footing and balance at all times:
  • Make sure you have good balance and a secure footing at all times.
  • Take special care in overgrown or wet terrain and always watch for hidden obstacles such as tree stumps, roots, rocks, holes and ditches to avoid stumbling or falling.
  • Be extremely cautious when working on slopes or uneven ground.
  • For better footing, always clear away fallen branches, scrub, cuttings and other material, objects or vegetation that can increase the danger of slipping, tripping or falling.
  • Never operate the trimmer above waist height.
  • Do not overreach.
• The trimmer should be balanced for proper control and less fatigue during operation.
  • Adjust the length of the drive tube and position of the loop handle to achieve and maintain a comfortable and effective working position.

Working Conditions

• Operate your trimmer only under good visibility during favorable daylight conditions.
  • Postpone the work if the weather is windy, foggy, rainy or inclement.
  • Consult governmental agencies such as ECCC, CCOHS and PHAC and other authoritative sources on hazardous materials if you are unfamiliar with the risks associated with the particular substances you are cutting or with which you are working.
• Your trimmer is a one-person machine.
  • Bystanders, especially children, and animals should not be allowed in the area where it is in use.
  • Switch off the trimmer immediately if you are approached.
• To reduce the risk of injury to bystanders and unauthorized users:
  • Never leave the trimmer unattended when the activation key is inserted.
  • Switch off the trimmer and remove the activation key during work breaks and any other time the trimmer is not in use.
• Sparks generated from operation of the trimmer may be capable of igniting combustible gases, liquids, vapors, dusts or other combustible materials and substances. To reduce the risk of fire and explosion:
  • Never operate the trimmer in a location where combustible gases, liquids, vapors, dusts or other combustible materials and substances are present.
  • Read and follow recommendations issued by government authorities (e.g., CCOHS) for identifying and avoiding the hazards of combustible gases, liquids, vapors, dusts or other combustible materials and substances.
• Some STIHL mowing heads have a metal core. High-speed contact with rock or other hard objects may create sparks, which can ignite flammable materials under certain circumstances. Flammable materials include dry vegetation and brush, particularly when weather conditions are hot and dry.
  • When there is a risk of fire or wildfire, do not use a mowing head with a metal core around dry vegetation or brush.
  • Contact your local fire authorities or the U.S. Forest Service if you have any question about whether vegetation and weather conditions are suitable for the use of a mowing head with a metal core.
  • STIHL does not recommend using a mowing head with a metal core when cutting in rocky areas or in areas with debris or other objects that could create sparks.
• Use of this trimmer can generate dust and other substances containing chemicals known to cause respiratory problems, cancer, birth defects and other reproductive harm.
• 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 or other airborne contaminants, especially those with a smaller particle size, may cause respiratory or other illnesses.
  • Control dust at the source where possible.
  • To the extent possible, operate the trimmer so that the wind or operating process directs any dust, mist or other particulate matter raised by the trimmer away from the operator.
  • When respirable dust or other particulate matter cannot be kept at or near background levels, always wear a respirator that is approved by PHAC and rated for worksite-specific conditions. Follow the recommendations of governmental authorities (e.g., CCOHS/PHAC) and occupational and trade associations.
• If the vegetation being cut or the surrounding ground is coated with a chemical substance, such as a pesticide or herbicide:
  • Read and follow the instructions and warnings that accompanied the substance coating the vegetation or surrounding ground.

Operating Instructions

• In the event of an emergency:
  • Switch off the motor immediately and remove the activation key.
• The cutting attachment continues to rotate for a short period after the trigger switch is fully released. This is known as the "flywheel effect." To reduce the risk of serious personal injury from contact with the cutting attachment:
  • Wait for the cutting attachment to stop before walking with the trimmer or putting it down.
    
• The rotating cutting attachment may fling foreign objects directly or by ricochet a great distance. Thrown objects, including broken cutting attachments, may cause serious or fatal injury to the operator or bystanders. To reduce the risk of severe personal injury:
  • Inspect the work area. Remove stones, glass, pieces of metal or other objects that could be thrown by the cutting attachment, damage the cutting attachment or cause damage to property (e.g., parked vehicles, windows).
    
  • Always wear proper eye protection and keep bystanders at least 50 ft. (15 m) away from the work area. Any persons who must enter the restricted area must also wear proper eye protection.
    
  • To reduce the risk of damage to property, also maintain this distance from such objects as vehicles and windows.
  • Maintaining a minimum distance of 50 ft. (15 m) cannot eliminate the potential risk of personal injury and property damage from thrown objects.
  • Switch off the motor immediately if you are approached while working with the trimmer.
• Your trimmer is equipped with a deflector. To reduce the risk of personal injury from thrown objects and contact with the cutting attachment:
  • Never operate the trimmer with a damaged or missing deflector.
    
  • Keep the deflector properly adjusted at all times.
• This trimmer is designed for use only with the STIHL PolyCut 2‑2 mowing head, which may be operated only with the specified nylon line or rigid polymer blades. Use of metal cutting attachments, wire or metal-reinforced line or other non-approved cutting attachments is not authorized and could be extremely dangerous.
  • Never use metal blades or metalreinforced line on this trimmer. Use only the cutting attachments listed in this manual, in combination with the listed deflector. See Combinations of Deflectors and Cutting Attachments.
    
• To reduce the risk of severe personal injuries from unintentional starting:
  • Never touch the cutting attachment or mowing head with your hand, feet or any other part of your body while the activation key is inserted, even when the cutting attachment is not moving. Keep bystanders at least 50 ft. (15 m) away.
    
  • Remove the activation key before installing or adjusting the bump guard and before converting the unit for edging.
  • Switch off the motor and remove the activation key before inspecting a mowing head, cutting attachment or deflector. Clean dirt, grass, weeds and other material from the mowing head and deflector at regular intervals, but only after removing the activation key.
    
• A damaged or loose cutting attachment or mowing head may vibrate, crack, break or come off the trimmer, which may result in serious or fatal injury.
  • Make sure the cutting attachment and mowing head are properly tightened before starting work.
  • Check the tightness and condition of the cutting attachment and mowing head before starting work and any time trimming behavior changes during use. Always switch off the motor, wait for the cutting attachment to stop and remove the activation key before inspecting the trimmer or its cutting attachment.
  • If the mowing head or cutting attachment loosens after being properly tightened, stop work immediately and have the trimmer inspected by your authorized STIHL servicing dealer.
  • Never use a trimmer with a loose mowing head or cutting attachment.
• A cracked, damaged or worn out mowing head may shatter at high speeds and cause serious or fatal injury.
  • Have a cracked, damaged or worn out mowing head replaced immediately, even if damage appears to be limited to superficial cracks.

• To reduce risk of electrocution:
  • Never operate this trimmer in the vicinity of any wires or cables that may be carrying electric current. Look carefully for concealed wires before starting work.
  • Do not rely on the trimmer's insulation against electric shock, even when holding the power tool by insulated gripping surfaces.

Charger Safety

Warnings and Instructions

• To reduce the risk of fire, electric shock and other personal injury or property damage:
  • Read and follow all cautionary markings on the charger and trimmer and all instructions in this manual before using the charger.
  • Use the STIHL LK 45 charger (power supply) only for charging STIHL HSA 45, FSA 45 and BGA 45 power tools. Using the STIHL LK 45 for other purposes is prohibited and may lead to fire, explosion or electric shock, resulting in serious or fatal personal injury and property damage.
  • For indoor use only.
    
  • Keep the charger dry. Protect it from rain, water, liquids and damp conditions. Never charge a wet trimmer or use a wet charger.
  • Do not handle the charger, including power supply cord and plug, with wet hands.
  • Never use a damaged or improperly functioning charger.
  • Never use or charge a trimmer with a housing that is cracked, deformed, excessively hot, leaking battery fluid or otherwise damaged. These could be signs that the integrated battery inside the trimmer is damaged, increasing the risk of personal injury and property damage from short circuit, fire or explosion.
  • Operate the charger only indoors, in dry rooms and within an ambient temperature range of 32°F to 104°F (0°C to 40°C).
  • Keep the charger out of the reach of children.
  • Always plug the charger into a properly installed electrical outlet matching the voltage and electrical frequency stated on the charger.
  • If too many devices are connected to a power strip, electrical components can be overloaded during charging, leading to overheating and fire. If using a power strip, never exceed its total capacity.
  • Do not operate a charger that has received a sharp or heavy blow, has been dropped or is otherwise damaged or not functioning properly in any way.
  • Do not attempt to repair, open or disassemble the charger. There are no user-serviceable parts inside.
• To reduce the risk of electric shock or fire from a short circuit:
  • Make sure the trimmer and charger are completely dry before starting the charging process.
• The charger heats up during the charging process. To reduce the risk of fire:
  • Do not operate on a combustible surface (e.g., paper, cardboard, textiles) or in a combustible environment.
  • Allow the charger to cool down normally. Do not cover it.
• Chargers can produce sparks which may ignite combustible gases, liquids, vapors, dusts or other combustible materials. To reduce the risk of fire and explosion:
  • Do not operate in a location where combustible gases, liquids, vapors, dusts or other combustible materials are present.
• Using a damaged power supply cord or plug may result in fire, electric shock and other personal injury or property damage. To reduce these risks:
  • Check the charger's power supply cord and plug regularly for damage. If damaged, immediately disconnect the plug from the electrical outlet.
    
  • Replace the charger if the power supply cord becomes damaged. The power supply cord cannot be repaired or replaced.
  • Unplug the charger from the electrical outlet and remove it from the trimmer when not in use
  • Never jerk the power supply cord to disconnect it from the electrical outlet. To unplug, grasp the plug, not the power supply cord.
  • Do not use the power supply cord for carrying or hanging up the charger.
  • Make sure the power supply cord is located or marked so that it will not be stepped on, tripped over, come in contact with sharp objects or moving parts, or otherwise be subjected to damage or stress.
• An extension cord should not be used unless absolutely necessary. Overloading an extension cord can result in overheating and fire. If an extension cord must be used:
  • Use only a properly wired 16 gauge (AWG 16) or heavier gauge extension cord and the cord length should not exceed 75 ft.
  • Never use an extension cord with a wattage rating lower than the wattage on your charger's rating plate.
  • Never use an extension cord if the blades on its plug are different from the blades on the charger plug in number, size or shape.
  • Do not link (chain) extension cords.
• In case of fire, or if the charger or trimmer it is charging emits smoke, has an unusual smell, feels hot or appears abnormal in any other way:
  • Immediately disconnect the charger from the outlet. Contact the authorities in the event of fire or explosion.
  • Have the charger and trimmer inspected and repaired by an authorized STIHL servicing dealer before use.
• Operation of the trimmer is disabled during the charging process to reduce the risk of electric shock.
  • Do not attempt to operate the trimmer during the charging process or any time it is connected to the LK 45.

Maintenance, Repair and Storage

Warnings and Instructions

• There are no user-authorized repairs for the trimmer or charger. To reduce the risk of fire, electric shock or other personal injury and property damage:
  • Users may carry out only the cleaning and maintenance operations described in this manual.
  • Strictly follow the cleaning and maintenance instructions in the appropriate sections of this instruction manual.
  • Never attempt to repair a damaged or broken mowing head or cutting attachment. This may cause broken parts to come off and result in serious or fatal injuries.
  • STIHL recommends that all repair or replacement work be performed by authorized STIHL servicing dealers.
• Unintentional starting may result in personal injury or property damage. To reduce the risk of personal injury and property damage from unintentional starting:
  • Remove the activation key before inspecting the trimmer or carrying out any cleaning, maintenance or repair work, before storing, and any other time the trimmer is not in use.
    
• Use of parts that are not authorized or approved by STIHL may cause serious or fatal injury or property damage.
  • STIHL recommends that only identical STIHL replacement parts be used for repair or maintenance.
• To reduce the risk of electric shock:
  • Unplug the charger from the electrical outlet before inspecting or cleaning the charger.
  • Regularly check the charger and ensure that the insulation of the power supply cord and plug are in good condition and show no signs of aging (brittleness), wear or damage.
  • Replace the charger if the power supply cord becomes worn or damaged. The power supply cord cannot be repaired or replaced.
• To reduce the risk of short circuit and fire:
  • Keep the charging socket and power supply cord connector free of foreign matter. Clean as necessary with a dry cloth or soft, dry brush.
• Improper storage can result in unauthorized use, damage to the trimmer and charger, and an increased risk of fire, electric shock and other personal injury or property damage.
  • Remove the activation key from the trimmer before storing. Store the activation key away from the trimmer in a safe place that is inaccessible to children and other unau‐ thorized users.
  • Never store the trimmer with the activation key inserted.
  • Before storing, always unplug the charger from the electrical outlet and remove the charger from the trimmer.
  • Store the trimmer and charger indoors in a dry, secure place that cannot be accessed by children or other unauthorized users.
  • Store the trimmer only within an ambient temperature range of 32°F to 122°F (0°C to 50°C).

Before Starting Work

Preparing the Trimmer for Operation

Before starting work:

• Fully charge the trimmer.
• Mount the deflector.
• Mount the trimmer line or polymer blades on the mowing head.
• Mount the trimmer's loop handle.
• Adjust the length of the drive tube.
• Adjust the trimmer's loop handle.
• Check the condition of the mowing head and cutting attachment.
• Check the controls for proper function and condition.

Charging the Trimmer

Charging

• Read and follow the trimmer and charger safety precautions and instructions in this manual. Be alert for signs that the integrated battery may be damaged. To reduce the risk of fire and explosion, never use or charge a trimmer with a housing that is cracked, deformed, excessively hot, leaking battery fluid or otherwise damaged.

• Since the trimmer and charger heat up during the charging process, do not charge the trimmer on a combustible surface or in a location where combustible gases, liquids, vapors, dusts or other combustible materials or substances are present.

To charge the trimmer:

• Remove the activation key.
  
• Insert the charger plug into a properly installed electrical outlet (6) with the same voltage and electrical frequency stated on the charger's rating plate (5).
• Push the connector (3) into the trimmer's charging socket (2) until it stops. The LEDs on the trimmer (1) glow green during charging and show the state of charge. When the LEDs on the trimmer go out, the charging process is complete and the charger will shut itself off.
• Remove the charger from the trimmer and disconnect the charger plug from the electrical outlet when charging is complete.

A trimmer is not fully charged when it ships from the factory. STIHL recommends that you fully charge the trimmer before using it the first time.
Operate the charger only indoors, in dry rooms and within an ambient temperature range of 32°F to 104°F (0°C to 40°C).
The trimmer heats up during operation. The charging process begins only after the trimmer and its integrated battery have cooled down sufficiently.
Charging time depends on a number of factors, including the condition of the integrated battery and the ambient temperature. For a complete list of approximate charging times, see www.stihl.com/charging-times.
Operation of the trimmer is disabled during charging and any time the trimmer is connected to the charger.

LED Diagnostics

Trimmer Status

LEDs on the trimmer show the status of the power tool and its integrated battery.
If three LEDs glow red continuously: the integrated battery is either too hot or too cold. Allow the trimmer to warm up or cool down gradually at an ambient temperature of about 50°F to 68°F (10°C to 20°C).
If three LEDs flash red when you activate the trigger switch: the trimmer has an electrical malfunction. Do not operate or charge the trimmer. Have it checked by an authorized STIHL servicing dealer before use or storage.

Charge Status

The LEDs also show the trimmer's state of charge.
To determine the trimmer's state of charge:

• Press the push button (1) on the trimmer. The LEDs on the trimmer will glow or flash green for about 5 seconds and indicate the state of charge (see illustration).

For example:
If four green LEDs glow continuously: full charge.
If one green LED is flashing: less than 20% charge.

Assembling the Trimmer

Mounting the Deflector

• To reduce the risk of injury from thrown objects or contact with the cutting attachment, never operate the trimmer without a properly mounted deflector. Keep bystanders at least 50 ft. (15 m) away.

To mount the deflector:

• Switch off the trimmer.
• Remove the activation key.
  

• Push the deflector (2) into the guides on the housing until it stops.
  The deflector must be tight against the housing.
• Insert and tighten the screws (3).
  The line limiting blade (1) comes mounted in the deflector and may not be removed.

PolyCut 2-2 Mowing Head

• Use of metal cutting attachments, wire or metal-reinforced line is not authorized and could be extremely dangerous. Use only the cutting attachments recommended in this manual, in combination with the recommended deflector.

• A damaged or loose cutting attachment or mowing head may vibrate, crack, break or come off the trimmer, which may result in serious or fatal injury or property damage. Make sure the mowing head and cutting attachment are properly tightened and in good condition before starting work.

To mount trimmer line on the PolyCut 2‑2:

• Switch off the trimmer.
• Remove the activation key.
  
• From below, push the trimmer line up through the right mounting hole and pull it back down through the left mounting hole until it is even with the bottom of the arrow (1).
• Hold the short end of the trimmer line firmly as you pull the long end downward and then out through the notch in the mowing head. Make sure the trimmer line is firmly seated in the notch (2).
• Repeat the mounting process on the other side of the mowing head with the second length of line.
  
• Cut the trimmer line so that it extends to the line limiting blade.

NOTICE

• Using the trimmer with overly long trimmer line increases the load on the motor and reduces its operating speed. This may result in overheating and damage to important components.

Mounting Polymer Blades

• Use of metal cutting attachments, wire or metal-reinforced line is not authorized and could be extremely dangerous. Use only the cutting attachments recommended in this manual, in combination with the recommended deflector.

• A damaged or loose cutting attachment or mowing head may vibrate, crack, break or come off the trimmer, which may result in seri‐ ous or fatal injury. Make sure the mowing head and cutting attachment are properly tightened and in good condition before starting work.

To mount the PolyCut 2‑2 polymer blades on the mowing head:

• Switch off the trimmer.
• Remove the activation key.
  
• Position the large hole in the polymer blade on the mounting post (see illustration).
• Pull the polymer blade (1) outward until the mounting post (2) locks in the small hole in the polymer blade.
• Repeat the mounting process on the other side of the mowing head with the second poly‐ mer blade.

Always ensure that both cutting blades are prop‐ erly mounted before starting work. Operating the trimmer with only one blade will reduce cutting performance and may damage the trimmer.

Mounting the Loop Handle

• To reduce the risk of injury from loss of control, ensure that the loop handle is properly mounted and adjusted before starting work.

To mount the loop handle:

• Switch off the trimmer.
• Remove the activation key.
  
• Line up the loop handle (2) with the mounting hole on the trimmer, keeping the recess for the star knob (1) on the right (see illustration).
• Insert the mounting screw (3) and tighten it with the star knob.

Adjusting the Trimmer

Adjusting the Length of the Drive Tube

• To reduce the risk of injury from loss of control, ensure that the drive tube is properly adjusted and engaged in the locked position at all times while working.

The length of the drive tube can be adjusted to suit the height and reach of the operator.
To adjust the length of the drive tube:

• Switch off the trimmer.
• Remove the activation key.
• Hold the drive tube firmly.
  
• Depress and hold the drive tube release button (1).
• Adjust the control handle (2) until it engages in the desired position.
• Release the drive tube release button.

Adjusting the Loop Handle

The loop handle can be set in different positions to suit the height and reach of the operator.
To adjust the position of the loop handle:

• Switch off the trimmer.
• Remove the activation key.
  
• Loosen the star knob (1).
• Adjust the loop handle (2) to the desired oper‐ ating position.
• Tighten the star knob securely.

Converting the Trimmer for Edging

• To reduce the risk of injury from loss of con‐ trol, ensure that the loop handle and drive tube are properly adjusted and the trimmer head adjustment latch are locked and secured at all times while working.

The trimmer can be converted for use in edging applications.
To convert the FSA 45:

• Switch off the trimmer.
• Remove the activation key.
  

• Depress and hold the drive tube release button (1).
• Turn the loop handle (2) 90° around the drive tube until it locks.
• Release the drive tube release button.
• Press and hold the trimmer head adjustment latch (4).
• Tilt the drive tube (3) down until it locks.
• Release the trimmer head adjustment latch.

Inserting and Removing the Activation Key

Inserting the Activation Key

• To reduce the risk of severe personal injury from unintended activation, never store the activation key in the trimmer.

To insert the activation key:

• Place the trimmer on a level surface.
• Insert the activation key (1) into the activation key socket (2) with even, steady pressure until it stops.
  Inserting the activation key enables the flow of electrical power from the integrated battery to the motor.

Removing the Activation Key

• To reduce the risk of severe personal injury from unintended activation, always remove the activation key before assembling, transporting, adjusting, cleaning, servicing, maintaining or storing the trimmer and any other time it is not in use.

To remove the activation key:

• Release the trigger switch.
• Place the trimmer on a level surface.
• Remove the activation key with even, steady pressure.
• Store the activation key away from the trimmer in a safe place that is inaccessible to children and other unauthorized users.

• To reduce the risk of serious or fatal injuries to the operator or bystanders, keep hands, feet and other parts of the body away from the cut‐ ting attachment. Do not touch the cutting attachment while the activation key is inserted. Never touch the moving cutting attachment with your hand or any part of your body.

Before switching on:

• Make sure you have a secure and firm footing.
• Stand upright.
• Always hold and operate the trimmer with one hand firmly on the rear or control handle and the other hand firmly on the front or loop handle.

To switch the trimmer on:

• Insert the activation key.
• Unlock the retaining latch (1) by pushing it forward with your thumb. Hold it in this unlocked position.
• Depress and hold the trigger switch lockout (2).
  The retaining latch can be released and will stay in the unlocked position.
• Squeeze the trigger switch (3) with your index finger.
  The cutting attachment will start moving.
  The motor will not switch on unless the retaining latch is unlocked and the trigger switch lockout and trigger switch are pressed at the same time.

Switching Off

• The cutting attachment will continue to move for a short while after the trigger switch is released. To avoid serious or fatal injury, avoid contact with the moving cutting attachment. To reduce the risk of personal injury from unintended activation or unauthorized use, switch off the motor, ensure the cutting attachment has stopped and remove the activation key before transporting or putting the trimmer down.

To switch the trimmer off:

• Release the trigger switch and trigger switch lockout.
  Once the trigger switch and trigger switch lockout have been released, the retaining latch will return to its locked position and activation of the trigger switch will be blocked.
  The cutting attachment will continue to move for a short time after the trigger switch is released. Take care to avoid contact after releasing the trigger switch and when setting down the trimmer.

Checking the Trimmer

Testing the Controls

Before starting work, confirm that the retaining latch (1), trigger switch lockout (2) and trigger switch (3) are undamaged and functioning properly:

Retaining Latch (1), Trigger Switch Lockout (2) and Trigger Switch (3)

• To reduce the risk of serious or fatal injuries, keep hands, feet and other parts of the body away from the cutting attachment. Do not touch the cutting attachment while the activation key is inserted. Never touch the moving cutting attachment with your hand or any part of your body. Keep bystanders at least 50 ft. (15 m) away while testing the controls.

To test the controls:

• Remove the activation key.
• Unlock the retaining latch by pushing it forward with your thumb.
• Hold the retaining latch in the unlocked position.
• Depress the trigger switch lockout and the trigger switch.
• Release the retaining latch, trigger switch lockout and trigger switch.
  The retaining latch, trigger switch lockout and trigger switch should return to their respective locked positions. If they do not, take the trimmer to an authorized STIHL servicing dealer to be repaired before use.
  If you can depress the trigger switch without first unlocking the retaining latch and depressing the trigger switch lockout, take the trimmer to an authorized STIHL servicing dealer to be repaired before use.
• Insert the activation key.
• Hold the trimmer firmly with both hands, your fingers wrapped tightly around the handles. Unlock the retaining latch and depress the trigger switch lockout and trigger switch momentarily.
  The trimmer should switch on. If it does not, take the trimmer to an authorized STIHL servicing dealer to be repaired before use.
• Release the trigger switch.
  The trimmer should switch off.
• If the cutting attachment does not stop after you release the trigger switch, remove the activation key and take the trimmer to an authorized STIHL servicing dealer to be repaired before use.

Checking the Mowing Head and Cutting Attachment

• To reduce the risk of injury from damaged or broken parts, check the condition of the trimmer, mowing head and cutting attachment before starting work and at regular, short intervals thereafter. Do not operate the trimmer with broken, damaged or malfunctioning parts.

Before starting work, and periodically thereafter, check the mowing head and cutting attachment for wear or damage:

• Switch off the trimmer and remove the activation key.
  
• If the wear mark (A) on the mowing head becomes visible, do not use the trimmer. Have the mowing head replaced before operating the power tool.
• Replace the polymer blades if they reduce in length to less than 1.8 in. (45 mm) (shown by distance a, above).
  Always replace both polymer blades or both pieces of nylon line at the same time.
• Do not use the mowing head if the polymer blades are worn or damaged (B). Replace the polymer blades immediately.

During Operation

Using the Trimmer

• To reduce the risk of personal injury, never work with the trimmer in the rain or in wet or damp conditions. Always wear proper clothing and protective apparel, including proper eye protection, when operating your trimmer. Keep bystanders at least 50 ft. (15 m) away from the work area. Work carefully and maintain proper control of the trimmer.

• To avoid serious or fatal injury, avoid contact with the moving cutting attachment.

The trimmer is designed for two-handed operation.

• Swing the trimmer back and forth carefully in a controlled arc parallel to the ground.
• Move forward slowly, keeping two hands on the trimmer at all times.

When trimming, a bump guard (1) limits the cutting range of the mowing line and helps prevent unwanted damage to vegetation in certain circumstances. Always remove the activation key before mounting or adjusting the bump guard.
If the trimmer is used or stored at ambient temperatures above 86°F (30°C), its runtime and performance may be reduced.
Runtime and cutting performance depend on a number of factors, including ambient temperatures, the type of grass being cut, the age and condition of the integrated battery and the type of cutting attachment being used.
When mounted with nylon trimmer line, runtime is approximately half of the runtime available when mounted with PolyCut 2-2 polymer blades. To optimize runtime, STIHL recommends mounting polymer blades on your PolyCut 2-2 mowing head.
Observe all applicable laws, regulations, standards and ordinances.
STIHL recommends keeping nylon line or polymer blades in a water bath for at least 12 to 24 hours before use to increase their useful life. 17 After Finishing Work

Using the FSA 45 for Edging

• When the FSA 45 is converted for edging, always hold the control handle with your right hand and the loop handle with your left hand to reduce the risk of injury from thrown objects and contact with the cutting attachment.

• Switch off the trimmer.
• Remove the activation key.
• Convert the trimmer for edging and fully extend the bump guard.
  

• Hold and guide the unit so that the cutting attachment rotates perpendicular to the ground.
• Move the trimmer along the edge of the lawn.
• When edging, use the bump guard to help regulate cutting depth.

After Finishing Work

Preparing for Transportation or Storage

• To reduce the risk of personal injury from unintended activation or unauthorized use, switch off the motor, ensure the cutting attachment has stopped and remove the activation key before transporting the trimmer or putting it down.

To prepare the trimmer for transportation or storage:

• Switch off the trimmer.
• Remove the activation key.
• If the trimmer became wet during operation, allow it to dry completely before charging or storing.

Transporting the Trimmer

Trimmer

• To reduce the risk of personal injury from unintended activation, never transport the trimmer with the activation key inserted.

• To reduce the risk of injury from loss of control and blade or line contact, never carry or transport your trimmer with the cutting attachment moving. Ensure the cutting attachment has stopped before setting it down.

When transporting the trimmer:

• Adjust the drive tube to its shortest length.
  
• When transporting the trimmer by hand, hold the drive tube in a manner that balances the trimmer horizontally. Keep the cutting attachment pointing backwards, opposite the direction in which you are walking.
• When transporting the trimmer in a vehicle, secure and position it to prevent turnover, impact and damage.

A Note on Battery Transport
The battery inside this trimmer complies with the requirements set forth in UN-Manual of Tests and Criteria, Part III, Subsection 38.3.
Commercial air, vessel and ground transportation of lithium ion cells and batteries contained in equipment is regulated. The battery inside this trimmer is classified as a UN 3481, Class 9, packaging group II product. Shipping it requires compliance with all applicable shipping regulations. Check with the ground, vessel, air cargo or passenger airline to determine if transport is prohibited or subject to restrictions or exemptions prior to shipping or travel.
Normally, no further conditions have to be met by the user in order to transport this trimmer by road to the operating site. Check and comply with any special regulations that may apply to your situation.
For further information please go to www.stihlusa.com/battery-transportation-safety.

• If the trimmer is damp or wet, dry it thoroughly before storing to reduce the risk of short circuit and electric shock.

• High temperatures may cause the integrated battery to generate heat, rupture, leak, ignite or explode, resulting in severe or fatal personal injury or property damage. Use and store the trimmer only within an ambient temperature range of 32°F to 122°F (0°C to 50°C).

When storing the trimmer:

• Switch off the trimmer.
• Remove the activation key.
• Clean the trimmer.
• Secure and position the trimmer to prevent turnover, impact and damage.
• Store the trimmer indoors in a dry and secure location, out of the reach of children and other unauthorized persons.
• Store the activation key away from the trimmer in a safe place that is inaccessible to children and other unauthorized users.
• Protect the trimmer against dampness and corrosive agents such as garden chemicals and de-icing salts.
• For maximum battery life, store the trimmer at an ambient temperature between 50°F and 68°F (10°C and 20°C) with a charge between 40% and 60% (2 green LEDs).
• If the trimmer is used or stored at ambient temperatures above 86°F (30°C), its runtime and performance may be reduced.
• Never store the trimmer with the activation key inserted.
• Before storing, always unplug the charger from the electrical outlet and remove the charger from the trimmer.

NOTICE

• A trimmer that is not stored properly may experience deep discharge, which can result in permanent damage. To avoid deep discharge:
  • For maximum battery life, store the trimmer with a charge between 40% and 60% (2 green LEDs).
  • For maximum battery life, store the trimmer at an ambient temperature between 50°F and 68°F (10°C and 20°C).

Polymer Blades

Up to 6 polymer blades can be stored on the trimmer.

• Attach the polymer blade (1) to the underside of the trimmer.
• Slide the tip of the polymer blade forward into the recess (2).

Charger

To properly store the charger:

• Disconnect the charger from the electrical outlet.
• Disconnect the charger from the trimmer.
• Store the charger indoors in a dry and secure location.
• Keep it out of the reach of children and other unauthorized persons.

Cleaning

Cleaning the Trimmer and Charger

• To reduce the risk of personal injury from unintended activation, remove the activation key before carrying out any cleaning work. Users of this trimmer should carry out only the cleaning described in this manual.

To clean the trimmer and charger:

• Clean the trimmer's polymer components with a slightly dampened cloth. Do not use detergents or solvents. They may damage the polymer components.
• Do not use a pressure washer to clean the trimmer or otherwise spray it with water or other liquids.
• Keep the charger housing and electrical contacts free from foreign matter. Clean as necessary with a soft brush or soft, dry cloth. Always unplug the charger before cleaning.

Inspection and Maintenance

Inspecting and Maintaining the Trimmer

• To reduce the risk of personal injury from unintended activation, remove the activation key before inspecting the trimmer or carrying out any maintenance. Carry out only the maintenance operations described in this manual. There are no user-authorized repairs. STIHL recommends that repair work be performed by authorized STIHL servicing dealers.

To properly maintain the trimmer:

• Have a worn deflector or mowing head replaced by an authorized STIHL servicing dealer.
• Have worn, missing or damaged safety labels replaced by an authorized STIHL servicing dealer.

Troubleshooting Guide

Always remove the activation key before carrying out any inspection, cleaning or maintenance.

Condition	LEDs on the Trimmer	Cause	Remedy
	3 LEDs flash red.	Malfunction in trimmer.	Do not attempt to use. The trimmer has a malfunction and must be checked by a servicing dealer.
Trimmer does not start when switched on		Activation key not fully inserted.	Remove the activation key. Visually check the electrical contacts of the activation key. Reinsert the activation key.
	1 LED flashes green.	Less than 20% charge remaining.	Charge the trimmer.
	3 LEDs glow red.	Integrated battery too hot.	Remove the activation key. Allow the trimmer to cool down gradually at ambient temperatures of about 50°F to 68°F (10°C to 20°C).
		Moisture in trimmer.	Allow the trimmer to dry.
Trimmer cuts out during operation	3 LEDs glow red.	Trimmer too hot.	Remove the activation key. Allow the trimmer to cool down gradually at ambient temperatures of about 50°F to 68°F (10°C to 20°C).
		Electrical malfunction.	Switch off the trimmer. Wait at least 5 seconds and switch it back on.
Run-time is too short		Trimmer not fully charged.	Charge the trimmer.
		Useful life of integrated battery has been reached or exceeded.	Have the trimmer checked by an authorized STIHL servicing dealer.
		Integrated battery too hot / too cold.	Allow the trimmer to warm up or cool down gradually at ambient temperatures of about 50°F to 68°F (10°C to 20°C).
Trimmer is not being charged	3 LEDs glow red.	Integrated battery too hot / too cold.	Allow the trimmer to warm up or cool down gradually at ambient temperatures of about 50°F to 68°F (10°C to 20°C). Operate the charger only in enclosed, dry rooms at ambient temperatures of 32°F to 104°F (0°C to 40°C).

STIHL LK 45

• Mains voltage: 100 V to 240 V
• Rated current: 0.4 A
• Frequency: 50/60 Hz
• Charging current: 0.65 A
• Rated power: 14.6 W
• Insulation: Class II (Double Insulation)
• Permissible ambient temperature range during charging: 32°F to 104°F (0°C to 40°C)
  Ambient temperatures above 86°F (30°C) may increase charging times.

Symbols on the Trimmer and Charger

Symbol	Explanation
V	Volt
Hz	Hertz
A	Ampere
Ah	Ampere hour
Wh	Watt hour
DC	Direct current
AC	Alternating current
	Push and hold the retaining latch in this direction to unlock.
	Push and hold the drive tube release but‐ ton to allow length adjustment
	Push and hold the drive tube release but‐ ton to allow edger-trimmer conversion
	Rated speed of the cutting attachment
	Direct current
	Polarity of coaxial output connector
	Number of cells and stored energy accord‐ ing to cell manufacturer's specification. Usable energy will be less.

• To reduce the risk of personal injury from thrown objects and contact with the cutting attachment, never operate the trimmer without the proper deflector and loop handle. Ensure that the deflector and loop handle are properly mounted and adjusted at all times while working. Never use metal blades or metal-reinforced line on this trimmer.

The deflector provided with the FSA 45 is the only authorized deflector for this unit. When properly installed, it is designed to reduce the risk of injury from thrown objects and inadvertent contact with the cutting attachment. The FSA 45 is approved for use only with the PolyCut 2‑2 mowing head, which may be operated only with the following cutting attachments:

• Nylon Trimmer Line: round quiet line with a diameter of 0.065 in. (1.6 mm).
• Rigid Polymer Blades: PolyCut 2-2 polymer blades.

The specified nylon trimmer line and the PolyCut 2-2 polymer blades are authorized for use in both the trimmer and edger-trimmer configurations.

Replacement Parts and Equipment

Genuine STIHL Replacement Parts

STIHL recommends the use of genuine STIHL replacement parts. Genuine STIHL parts can be identified by the STIHL part number, the logo and, in some cases, by the STIHL parts symbol . The symbol may appear alone on small parts.

Addresses
STIHL Limited
STIHL Limited 1515 Sise Road London, ON. N6A 4L6 CANADA