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DeWalt DCST990B - User Manual

DeWalt DCST990B
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DCST990, DCST990B 40V Max* Lithium Brushless String Trimmer
Taille-bordure sans balaisDCST990, DCST990B au lithium-ion de 40V max.*
Podadora de cuerda sin escobillas y con batería de iones de litio de 40V Máx* DCST990, DCST990B
INSTRUCTION MANUAL
GUIDE D'UTILISATION
MANUAL DE INSTRUCCIONES
INSTRUCTIVO DE OPERACIÓN, CENTROS DE SERVICIO Y PÓLIZA DE
GARANTÍA. ADVERTENCIA: LÉASE ESTE INSTRUCTIVO ANTES DE
USAR EL PRODUCTO.
If you have questions or comments, contact us.
Pour toute question ou tout commentaire, nous contacter.
Si tiene dudas o comentarios, contáctenos.
1-800-4-DeWALT • www.dewalt.com

Questions and Answers

  • A
    Antonio PadillaAug 16, 2025
    How to fix DeWalt DCST990B that will not start?
    • Q
      qwiseAug 16, 2025
      If your DeWalt Trimmer won't start, there are a few things you can check. First, make sure the battery is correctly installed. Next, verify the battery meets the necessary charging requirements. Finally, ensure that the lock-off is fully pulled back before you engage the main trigger.
  • Y
    youngrebeccaAug 19, 2025
    How to fix a DeWalt DCST990B that will not start?
    • J
      Joseph ThomasAug 19, 2025
      If your DeWalt Trimmer won't start, try the following: * First, check that the battery is correctly installed. * Ensure the battery meets the charging requirements. * Make sure that you fully pull back the lock off before you move the main trigger.
  • T
    Theresa ThompsonAug 22, 2025
    What to do if my DeWalt DCST990B Trimmer shuts down while using it?
    • T
      Tiffany MurrayAug 22, 2025
      If your DeWalt Trimmer shuts down during use, try the following: Ensure the battery is fully charged. Clear any debris that may be around the spool. Reduce the cutting width to a maximum of 15 inches. Also, if you removed the guard, reinstall it.
  • J
    Jonathan LandryAug 25, 2025
    What to do if my DeWalt DCST990B Trimmer battery won’t charge?
    • J
      Joseph WillisAug 25, 2025
      If the battery for your DeWalt Trimmer won’t charge, try these steps: First, insert the battery into the charger until the red light comes on, and let it charge for up to 8 hours if completely drained. Ensure the charger is plugged into a working outlet, testing the outlet with another appliance if needed. Check if the outlet is connected to a light switch that might be turning off the power. Move the charger to an area where the air temperature is between 40 °F (4.5 °C) and 105 °F (40.5 °C).
  • C
    Carolyn HicksAug 27, 2025
    Why is my DeWalt Trimmer vibrating?
    • E
      Eric RoweAug 27, 2025
      If the DeWalt Trimmer is vibrating, ensure that both cutting lines are the same length. Also, check to see if the spool is wound properly. Replace it if the spool is broken.
  • S
    Samantha GonzalezAug 30, 2025
    How to troubleshoot a DeWalt DCST990B that runs slowly?
    • A
      Amber EstradaAug 30, 2025
      If your DeWalt Trimmer is running slowly, try these steps: First, fully depress the variable speed trigger, as the speed depends on how far you press it. If it still runs slowly, remove the battery. Inspect the spool housing to ensure it rotates freely, cleaning if necessary. Lastly, check that the cutting line does not extend more than approximately 4-13/16" (122 MM) from the spool; trim it if it does.
  • D
    David RodriguezSep 1, 2025
    Why does my DeWalt DCST990B Trimmer shut down while I'm using it?
    • M
      Mary LambertSep 1, 2025
      If your DeWalt Trimmer shuts down during use, several factors could be the reason. Try these solutions: fully charge the battery, clear any debris around the spool, limit the cutting swath to a maximum of 15 inches (381 mm), and ensure the guard is properly installed.
  • W
    William MurphySep 4, 2025
    How to troubleshoot a DeWalt DCST990B that will not start?
    • N
      novakthomasSep 4, 2025
      If your DeWalt Trimmer won't start, there are several things you can check: Make sure the battery is correctly installed and has sufficient charge. Ensure the lock-off is fully pulled back before engaging the main trigger. For DCST960 models, the brushes may need replacement; refer to the section on Replacing Brushes in Motor.
  • C
    Carmen GraySep 7, 2025
    Why is my DeWalt DCST990B Trimmer vibrating so much?
    • J
      Judith PhillipsSep 7, 2025
      Excessive vibration in your DeWalt Trimmer can be due to a couple of reasons. First, check that both cutting lines are the same length. Second, inspect the spool to ensure it's wound correctly; replace it if it's broken.
  • M
    Megan RaySep 10, 2025
    What to do if DeWalt DCST990B Trimmer runs slowly?
    • E
      Elizabeth WolfeSep 12, 2025
      If your DeWalt Trimmer is running slowly, try the following: Remove the battery from the appliance. Check that the spool housing can rotate freely, cleaning it carefully if necessary. Also, ensure that the cutting line does not protrude more than approximately 4-13/16" (122 mm) from the spool; if it does, cut it off so that it just reaches the line trimming blade. For DCST960 models, the brushes may need to be replaced; refer to the Replacing Brushes in Motor section.

DeWalt DCST990B Specifications

General IconGeneral
BrandDeWalt
ModelDCST990B
CategoryTrimmer
LanguageEnglish

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