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Kobalt 3809908 - User Manual

Kobalt 3809908
37 pages
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AS21227
Questions, problems, missing parts? Before returning to your retailer, call our customer
service department at 1-888-3KOBALT (1-888-356-2258), 8 a.m. - 8 p.m., EST,
Monday - Sunday. You could also contact us at partsplus@lowes.com or visit
www.lowespartsplus.com.
ATTACH YOUR RECEIPT HERE
Serial Number Purchase Date
Español p. 19
ITEM #3809908/4132848/3809907
BRUSHLESS
STRING TRIMMER
MODEL #KST 1040B-03
KOBALT and logo design are trademarks or
registered trademarks of LF,LLC.All rights reserved.

Questions and Answers

  • S
    Susan SandersAug 7, 2025
    What to do if my Kobalt 3809908 Trimmer stops while cutting?
    • J
      Jessica MillerAug 7, 2025
      If your Kobalt Trimmer stops while cutting, several factors could be the cause. First, the motor shaft or trimmer head may be bound with grass. To resolve this, stop the trimmer, disconnect the battery, and remove any grass from the motor shaft and trimmer head. Another reason could be that the motor is overloaded. Try moving the trimmer head to cut grass no more than 8 inches in a single pass, then remove the trimmer head from the grass and restart the tool. Lastly, the battery pack or string trimmer might be too hot. In this case, release the trigger switch, allow the tool to cool down, and then try starting it again.
  • E
    efergusonAug 23, 2025
    Why won't the trimmer head on my Kobalt 3809908 advance the cutting line?
    • P
      Patricia MitchellAug 23, 2025
      If the trimmer head of your Kobalt Trimmer won't advance the cutting line, the motor shaft or trimmer head could be bound with grass. To fix this, stop the trimmer, disconnect the battery, and clean the motor shaft and trimmer head. Alternatively, there might not be enough cutting line on the spool. If this is the case, disconnect the battery and replace the cutting line.

Summary

Safety Information

Important Safety Precautions

Key safety precautions for electric trimmers.

Read All Operating Instructions

Crucial advice on reading all instructions for safe operation.

Assembly Instructions

Unfolding the Shaft

Steps for unfolding the trimmer shaft safely.

Mounting the Guard

Instructions for mounting the safety guard correctly.

Mounting the Front-Assist Handle

Guide to mounting the front-assist handle.

Attach and Remove Battery Pack

Instructions for attaching and removing the battery pack.

Operating Instructions

Care and Maintenance

Troubleshooting Guide

Kobalt 3809908 Specifications

General IconGeneral
Battery TypeLithium-Ion
Line FeedBump Feed
Attachment CapableNo
Shaft TypeStraight
Power SourceBattery
Cutting HeightAdjustable
Wheel SizeNot Applicable
Cutting Width15 inches
Voltage80-volt
Line Diameter0.080 inches

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