GreenWorks Elite ST-120-T

Questions and Answers

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Matthew NelsonAug 4, 2025
How to fix a GreenWorks string trimmer that fails to start?
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  Kenneth JacksonAug 4, 2025
  If your GreenWorks string trimmer isn't starting, it could be due to several reasons. Make sure the battery pack is properly attached to the trimmer. If it is, remove the battery, check the contact, and reinstall it. The battery pack might also be depleted, so try charging it. Ensure you are pressing down the lock-off lever and holding it while depressing the trigger simultaneously. Also, make sure to start the power button first, and the power indicator will trigger later. Attach the battery pack to the trimmer.
C
Craig BellAug 8, 2025
What to do if the GreenWorks Elite ST-120-T head will not advance line?
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  Andrew HuynhAug 8, 2025
  If the trimmer head on your Greenworks trimmer won't advance the line, the motor shaft or trimmer head might be bound with grass. Stop the trimmer, remove the battery, and clean the motor shaft and trimmer head. Also, check if there's enough line on the spool. If not, remove the battery and replace the cutting line. A dirty trimmer head can also cause this issue, so remove the battery and clean the spool, spool retainer, and spool base. If the line is tangled, remove the battery, remove the line from the spool, and rewind it. If the line is too short, remove the battery and pull the lines while alternately pressing down on and releasing the bump knob. Remove bump head hit on the ground.
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Sarah WangAug 14, 2025
What to do if the line is not cutting well on my GreenWorks Elite ST-120-T Trimmer?
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  qjenkinsAug 14, 2025
  If the line on your GreenWorks trimmer isn't cutting well, the line-cutting blade on the edge of the guard may have become dull. Sharpen the line-cutting blade with a file or replace it with a new blade.
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Julie PayneAug 23, 2025
Why does the line keep breaking on my GreenWorks trimmer?
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  Nicholas AustinAug 23, 2025
  If the line on your GreenWorks trimmer keeps breaking, it might be due to incorrect use. Only trim with the tip of the line, avoiding stones, walls, and other hard objects. Feed the line regularly to maintain full cutting width.
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Meagan BrownAug 28, 2025
Why is grass wrapping around the trimmer head and motor housing of my GreenWorks trimmer?
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  Antonio ObrienAug 28, 2025
  If grass is wrapping around the trimmer head and motor housing of your GreenWorks trimmer, it's likely because you're cutting tall grass at ground level. To prevent this, cut tall grass from the top down, removing no more than 8 inches in each pass.
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Jennifer SmithNov 17, 2025
Why does my GreenWorks Elite ST-120-T Trimmer stop while cutting?
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  Taylor TaylorNov 17, 2025
  Your Greenworks trimmer might stop for several reasons. The guard might not be mounted, causing motor overload. Using heavy cutting line can also cause this issue; use only nylon cutting line 0.065" diameter or less. Grass tangled around the motor shaft or trimmer head, an overloaded motor, an overheated battery pack or trimmer, a disconnected battery pack, or a depleted battery pack could also be the cause. Re-install or charge the battery pack if needed. Allow the battery pack to cool until the temperature drops below 158°F (70°C). Allow the trimmer to cool until the temperature drops below 140°C. If the motor is overloaded, remove the trimmer head from the grass. The motor will recover to work as soon as the load is removed. When cutting, move the trimmer head in and out of the grass to...

Summary

Product Specifications

40 V Lithium-Ion String Trimmer Details

Technical specifications of the 40V Lithium-Ion String Trimmer, including type, motor, width, and speed.

General Safety Instructions

Operation, Maintenance, and Storage Safety

Essential safety practices for operating the string trimmer, including PPE, environment, and bystander safety.

Battery Safety and Handling

Battery Charging, Usage, and Disposal Precautions

Crucial safety advice for handling, charging, and disposing of batteries, and general tool safety.

Specific Safety Warnings

Child Safety and Proposition 65 Notice

Guidelines for child safety during operation and information on Proposition 65 chemical exposure.

Symbols and Identification

Understanding Product Symbols

Explanation of various symbols used on the product and in the manual for safe operation.

Signal Words and Service

Hazard Levels and Professional Servicing

Definitions of hazard signal words and recommendations for professional servicing.

Know Your String Trimmer

Component Identification Diagram

Diagram identifying the main parts of the string trimmer for user familiarity.

String Trimmer Component Details

Detailed Part Functions and Explanations

Detailed explanations of each component's function and purpose on the string trimmer.

Assembly Instructions: Unpacking

Unpacking and Initial Inspection Procedures

Steps for unpacking the trimmer, verifying contents, and inspecting for shipping damage.

Assembly Instructions: Attachment

Attaching Edge Guide and Assembly Warnings

Instructions for attaching the edge guide and warnings about assembly safety.

Assembly Instructions: Guard

Installing the Trimmer Guard

Step-by-step guide for attaching the guard to the trimmer head for debris protection.

Assembly Instructions: Shafts

Connecting Upper and Lower Shaft Sections

Procedure for connecting the upper and lower shaft sections using the coupler mechanism.

Assembly Instructions: Handle

Attaching the Auxiliary Handle

Instructions for mounting and adjusting the auxiliary handle for optimal grip and control.

Operation Guidelines: General

Safety and Attachment Usage in Operation

Crucial warnings regarding reading the manual, avoiding complacency, and using approved attachments only.

Operation: Battery and Starting

Battery Installation, Removal, and Trimmer Control

Instructions for battery handling and safely starting and stopping the string trimmer.

Operation: Trimmer Handling

Proper Grip, Posture, and Cutting Techniques

Tips for proper handling, posture, and cutting techniques for efficient and safe trimmer operation.

Operation: Line Management

Line Advancement and Preparing for Replacement

Explanation of line advancement and steps for preparing to replace the cutting line.

Operation: Line Replacement

Spool Winding and Correct Positioning

Detailed steps for preparing the spool, winding the cutting line, and positioning it correctly.

Operation: Reassembly

Reinstalling the Spool and Trimmer Head Cover

Instructions for reinstalling the spool and trimmer head cover.

Operation: Cutting Tips

Optimal Cutting Techniques and Obstacle Avoidance

Advice on tilting the trimmer, cutting direction, and avoiding obstacles for best results.

Maintenance Procedures

Cleaning, Storage, and Maintenance Schedule

Guidelines for cleaning, storage, and a schedule for routine maintenance tasks.

Battery Disposal

Environmental Disposal and Damaged Battery Handling

Information on toxic battery materials, proper disposal, and handling damaged or leaking batteries.

Troubleshooting: Performance Issues

Resolving Starting and Stopping Problems

Solutions for common problems when the string trimmer fails to start or stops during use.

Troubleshooting: Cutting Issues

Addressing Line, Wrapping, and Cutting Quality

Resolving issues related to line advancement, line breakage, grass wrapping, and cutting performance.

Limited Warranty Information

Warranty Coverage, Service, and Transportation

Details on warranty coverage, how to obtain service, and transportation responsibilities.

Exploded View

Exploded Parts Identification Diagram

An exploded view diagram illustrating all parts of the string trimmer with numerical references.

Parts List

Detailed Parts Breakdown and Numbers

A comprehensive list of all parts, including part numbers, quantities, and descriptions.