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DeWalt DCST920 - User Manual

DeWalt DCST920
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RECONDITIONED DCST920 20V Max* Lithium S
tring Trimmer
Taille-bordure DCST920 au lithium-ion de 20 V max.*
Podadora de cuerda con batería de iones de litio de 20 V Máx* DCST920
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

  • T
    Tina DuarteAug 15, 2025
    How to fix a vibrating DeWalt DCST920 Trimmer?
    • Q
      qhoweAug 16, 2025
      If your DeWalt Trimmer is vibrating, make sure both cutting lines are the same length. Also, check to see if the spool is properly wound; replace it if it is broken.
  • P
    Peter ThomasAug 18, 2025
    How to fix a DeWalt Trimmer that won't start?
    • J
      Joseph NorrisAug 19, 2025
      If your DeWalt Trimmer isn't starting, try these steps: * Ensure the battery is correctly installed. * Verify the battery meets the charging requirements. * Make sure the lock-off is fully pulled back before you engage the main trigger.
  • A
    Alyssa HansonAug 21, 2025
    How to troubleshoot a DeWalt DCST920 that will not start?
    • A
      amandamckeeAug 22, 2025
      If your DeWalt Trimmer won't start, first ensure the battery is correctly installed. Next, verify the battery meets the charging requirements. Also, make sure the lock-off is fully pulled back before engaging the main trigger.
  • R
    Raymond BakerAug 25, 2025
    What to do if my DeWalt DCST920 shuts down while I am using it?
    • A
      Ashley MartinAug 26, 2025
      If your DeWalt Trimmer shuts down during use, try the following: Charge the battery. Clear any debris from around the spool. Reduce the cutting swath to a maximum of 13 inches (330 mm). Reinstall the guard if it was removed.
  • C
    Chelsea GuzmanAug 28, 2025
    What to do if my DeWalt DCST920 battery won’t charge?
    • N
      Nicole RomeroAug 28, 2025
      If the battery of your DeWalt Trimmer won’t charge, insert the battery into the charger until the red charging light illuminates, and allow it to charge for up to 8 hours if fully drained. Ensure the charger is plugged into a working outlet, testing the outlet with another appliance if necessary. Check if the outlet is connected to a light switch that may be turning the power off. Finally, move the charger and battery to an environment where the air temperature is between 40 °F (4.5 °C) and 105 °F (40.5 °C).
  • S
    Sean PerezAug 31, 2025
    Why is my DeWalt DCST920 running slowly?
    • A
      Andrew TaylorAug 31, 2025
      If your DeWalt Trimmer runs slowly, fully depress the variable speed trigger, as the level of depression affects the speed. If it still runs slowly, remove the battery. Check that the spool housing can rotate freely, cleaning it if necessary. Also, ensure that the cutting line does not protrude more than approximately 4-13/16" (122 MM) from the spool; trim it if it does.
  • J
    Jenna MatthewsSep 2, 2025
    Why does my DeWalt DCST920 Trimmer shut down while I'm using it?
    • T
      Tracy CamposSep 2, 2025
      Your DeWalt Trimmer might shut down during use for several reasons. Here’s what you can check: * Charge the battery. * Clear any debris that may be around the spool. * Reduce the cutting width to a maximum of 13 inches. * If you removed the guard, reinstall it.
  • S
    schmidtchristopherSep 6, 2025
    Why is my DeWalt Trimmer battery not charging?
    • L
      Lisa FuentesSep 6, 2025
      If your DeWalt Trimmer battery isn't charging, here’s what to do: * Insert the battery into the charger until the red charging light comes on. If the battery is completely drained, allow it to charge for up to 8 hours. * Ensure the charger is plugged into a working outlet. For further details, consult the Important Charging Notes. * Test the outlet by plugging in another appliance. * Check if the outlet is connected to a light switch that might be turning the power off. * Move the charger and battery to an area where the air temperature is between 40 °F (4.5 °C) and 105 °F (40.5 °C).
  • J
    Jason DonaldsonSep 9, 2025
    What to do if my DeWalt DCST920 Trimmer is vibrating?
    • O
      odudleySep 9, 2025
      If your DeWalt Trimmer is vibrating, consider the following: * Ensure that both cutting lines are the same length. * Check if the spool is wound correctly. Replace the spool if it's broken.
  • D
    David ByrdSep 12, 2025
    How to troubleshoot a DeWalt DCST920 Trimmer that runs slowly?
    • A
      amanda14Sep 12, 2025
      If your DeWalt Trimmer is running slowly, try the following: * Fully press the variable speed trigger, as the speed depends on how far you press it. * If it still runs slowly, remove the battery. * Make sure the spool housing can rotate without any obstruction; clean it carefully if needed. * Check that the cutting line doesn't extend more than approximately 4-13/16" (122 mm) from the spool. If it does, trim it back to the line trimming blade.

Summary

Key Information and General Safety

Guard and Line Replacement Warnings

Crucial warnings regarding the guard and proper line replacement.

General Safety Precautions

Fundamental safety precautions for operating electric gardening appliances.

Personal Protective Equipment and Attire

Mandatory eye protection and recommendations for proper clothing and footwear.

Bystander and Area Safety

Ensuring safe distance for bystanders and pets from the work area.

Operational Hazard Avoidance

Instructions to prevent rebound injuries, accidental starts, and improper use.

California Proposition 65 Warning

Warning about chemicals in dust known to cause cancer or reproductive harm.

Battery Pack Safety and Charger Operation

Battery Handling and Charging Safety

Guidelines for safe charging, handling, storage, and avoiding hazardous environments.

Battery Pack Damage and Fire Hazards

Warnings regarding battery pack integrity, damage, and fire risks.

Lithium Ion Specific Precautions

Specific safety instructions for Li-Ion batteries, including incineration and contact precautions.

Charger Safety: General Warnings

Critical safety warnings for charger operation, liquid hazards, and battery compatibility.

Charger Usage and Environmental Precautions

Guidelines for proper charger use, avoiding foreign materials, and environmental exposure.

Charging Procedure

Step-by-step instructions for charging the battery pack using the charger.

Product Assembly and Operation

Trimming, Maintenance, and Replacement

Replacing the Cutting Line

Detailed steps for removing and installing new cutting line on the spool.

Replacing the Guard

Steps for safely removing and installing the trimmer guard.

Troubleshooting

Unit Will Not Start

Solutions for when the unit fails to start.

Unit Shuts Down in Use

Troubleshooting steps for the unit shutting down during operation.

Battery Wont Charge

Solutions for issues related to the battery not charging.

DeWalt DCST920 Specifications

General IconGeneral
Power SourceBattery
Voltage20V MAX
Weight8.5 lbs
Feed TypeBump Feed
Cutting Swath13 inches
Line Diameter0.080 inches
Cutting Width13 inches
Cutting Path13 inches
Battery TypeLithium-Ion
Battery IncludedYes
Charger IncludedYes

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