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Stihl FSA 90 R - User Manual

Stihl FSA 90 R
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STIHL FSA 90 R
WARNING
Read Instruction Manual thoroughly
before use and follow all safety
precautions – improper use can
cause serious or fatal injury.
ADVERTENCIA
Antes de usar la máquina lea y siga
todas las precauciones de
seguridad dadas en el manual de
instrucciones – el uso incorrecto
puede causar lesiones graves o
mortales.
Instruction Manual
Manual de instrucciones

Table of Contents

Questions and Answers

  • D
    doyletraciAug 20, 2025
    Why does my Stihl FSA 90 R Trimmer keep cutting out?
    • T
      Taylor MacdonaldAug 20, 2025
      If your Stihl Trimmer cuts out during operation, it could be due to the following reasons: * The battery or the machine's electronics might be overheating. Remove the battery from the machine and allow both the battery and the machine to cool down. * There may be an electrical or electromagnetic malfunction. Try removing the battery and then re-fitting it to see if that resolves the issue.
  • T
    Thomas VazquezAug 26, 2025
    Why does my Stihl Lawn Mower keep cutting out?
    • E
      Emily DelgadoAug 26, 2025
      If your Stihl Lawn Mower cuts out during operation, it might be because the battery or the machine's electronics are too hot. Remove the battery and allow both the battery and the machine to cool down. Another possible cause is an electrical fault. In this case, remove the battery and then refit it.
  • J
    Jeffrey WhitakerAug 28, 2025
    Why is my Stihl Lawn Mower battery not charging but the LED is green?
    • M
      michael96Aug 28, 2025
      If your Stihl Lawn Mower battery isn't charging even when the LED on the charger glows green, the battery might be too hot or too cold (1 LED on the battery glows red). Allow the battery to cool down, or if it's too cold, allow it to warm up slowly at temperatures between 59°F - 68°F (15°C - 20°C). Ensure you operate the charger in closed, dry rooms at ambient temperatures of 41°F - 104°F (5°C - 40°C).
  • V
    vfisherAug 30, 2025
    Why is the running time of my Stihl Lawn Mower so short?
    • C
      Christopher WellsAug 30, 2025
      If the running time of your Stihl Lawn Mower is too short, several factors could be responsible. Ensure the battery is fully charged. If not, charge the battery. The issue might be the nylon line; consider replacing it if it's unsuitable. Also, the battery's lifespan could be over; consider checking and replacing it if necessary.
  • L
    Lisa FigueroaSep 1, 2025
    What to do if the LED on my Stihl Lawn Mower charger flashes red?
    • C
      Calvin RogersSep 1, 2025
      If the LED on your Stihl Lawn Mower charger flashes red, there could be a few reasons. First, check the electrical contact between the charger and the battery by removing and refitting the battery. Another cause might be a fault in the battery (indicated by 4 LEDs flashing red for about 5 seconds); remove and refit the battery, and if the LEDs continue to flash, the battery needs replacing.
  • C
    Christy DawsonSep 4, 2025
    What to do if my Stihl Lawn Mower battery jams when inserting?
    • K
      Kevin SextonSep 4, 2025
      If the battery jams when you're inserting it into your Stihl Lawn Mower or charger, the guides or contacts might be dirty. Carefully clean the guides and contacts to resolve this issue.
  • J
    jonesrachelSep 6, 2025
    What to do if the LED on my Stihl Trimmer charger flashes red?
    • K
      Keith MartinSep 6, 2025
      If the LED on the charger of your Stihl Trimmer flashes red, it could indicate a few potential issues: * There might be no electrical contact between the charger and the battery. Try removing the battery and reinserting it to ensure a proper connection. * The battery could have a fault. If four LEDs on the battery flash red for about 5 seconds, take the battery out and refit it. If the LEDs continue to flash, the battery has a malfunction and needs to be replaced. * The charger itself might be faulty. In this case, have the charger checked by a servicing dealer.
  • J
    Jonathan HallSep 9, 2025
    Why is the runtime of my Stihl FSA 90 R Trimmer so short?
    • J
      James JacksonSep 9, 2025
      If the runtime of your Stihl Trimmer is too short, consider these possible causes: * The battery may not be fully charged. Ensure you charge the battery completely before use. * You might be using an unsuitable nylon line. Try replacing the nylon line with a more appropriate type. * The battery's useful life might have been reached or exceeded. Check the battery and replace it if necessary.
  • D
    Daniel MendozaSep 12, 2025
    Why Stihl FSA 90 R Trimmer battery is not charging when LED is green?
    • M
      Michelle HowellSep 12, 2025
      If the battery of your Stihl Trimmer is not being charged even though the LED on the charger glows green, it is possible that the battery is either too hot or too cold. If one LED on the battery glows red, allow the battery to cool down or warm up slowly at a temperature of about 15°C - 20°C. Also, make sure to operate the charger only in closed, dry rooms at ambient temperatures between +5°C and +40°C.
  • W
    William WestSep 14, 2025
    How to fix a Stihl Trimmer battery that jams when inserting?
    • S
      Stacy MartinSep 14, 2025
      If the battery jams when you try to insert it into the Stihl Trimmer or charger, it is likely that the guides or contacts are dirty. Carefully clean the guides and contacts to resolve this issue.

Summary

Important Safety Instructions

Safety Precautions and Working Techniques

The Operator

Physical Condition

Operator's physical and mental health requirements for safe operation.

Proper Clothing

Guidelines for appropriate attire to ensure operator safety during use.

Battery

Charger

The Use of the Power Tool

Before Starting Work

During Operation

Operating Instructions

Approved Combinations of Cutting Attachment, Deflector, Handle and Harness

Mounting the Loop Handle

Mounting the Deflector

Mounting the Cutting Attachment

Connecting Charger to Power Supply

Charging the Battery

Fitting the Harness

Balancing the Machine

Throwing Off the Machine

Switching On

Fitting the Battery

Instructions for correctly inserting the battery into the power tool.

Switching Off

Removing the Battery

Procedure for safely removing the battery from the power tool.

Storing the Machine

Storing the Battery

Recommendations for storing the battery to optimize its lifespan.

Storing the Charger

Guidelines for safely storing the battery charger.

Maintaining the Mowing Head

Replacing Cutting Line

Instructions for replacing the nylon cutting line.

Adjusting Nylon Line

Fitting Nylon Line for DuroCut

Instructions for fitting nylon line into the DuroCut mowing head.

Maintenance and Care

Main Parts

Specifications

Battery Specifications

Technical specifications for the Lithium-ion AP and AR batteries.

Charger Specifications

Technical specifications for AL 100 and AL 300 chargers.

AL 500 Charger Specifications

Troubleshooting

Maintenance and Repairs

Stihl FSA 90 R Specifications

General IconGeneral
TypeString trimmer
CordlessYes
Head typeNylon line
Handle typeD-loop handle
Product colorBlack, Orange, White
Vibration emission4.8 m/s²
Sound pressure level73 dB
Cutting diameter (max)380 mm
Power sourceBattery
Battery voltage36 V
Weight and Dimensions IconWeight and Dimensions
Length1770 mm
Weight2800 g

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