Stihl FSA 90 R User Manual (English)

Questions and Answers:

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doyletraciAug 20, 2025
Why does my Stihl FSA 90 R Trimmer keep cutting out?
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  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.
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Thomas VazquezAug 26, 2025
Why does my Stihl Lawn Mower keep cutting out?
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  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.
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Jeffrey WhitakerAug 28, 2025
Why is my Stihl Lawn Mower battery not charging but the LED is green?
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  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).
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vfisherAug 30, 2025
Why is the running time of my Stihl Lawn Mower so short?
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  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.
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Lisa FigueroaSep 1, 2025
What to do if the LED on my Stihl Lawn Mower charger flashes red?
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  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.
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Christy DawsonSep 4, 2025
What to do if my Stihl Lawn Mower battery jams when inserting?
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  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.
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jonesrachelSep 6, 2025
What to do if the LED on my Stihl Trimmer charger flashes red?
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  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.
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Jonathan HallSep 9, 2025
Why is the runtime of my Stihl FSA 90 R Trimmer so short?
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  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.

Stihl FSA 90 R Specifications

General

Type	String trimmer
Cordless	Yes
Head type	Nylon line
Handle type	D-loop handle
Product color	Black, Orange, White
Vibration emission	4.8 m/s²
Sound pressure level	73 dB
Cutting diameter (max)	380 mm
Power source	Battery
Battery voltage	36 V