GreenWorks Tools ST40L210

Questions and Answers

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Jeff MarshallAug 4, 2025
Why does my GreenWorks Tools ST40L210 stop while cutting?
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  Kyle MasonAug 5, 2025
  Your GreenWorks Tools Trimmer might stop while cutting due to several reasons. The guard might not be mounted, leading to motor overload. Ensure the guard is properly mounted. Using heavy cutting line can also cause this; use only nylon cutting line 0.080" diameter or less. Grass wrapped around the motor shaft or trimmer head can cause the issue, so stop the trimmer, remove the battery, and clear any grass. The motor could be overloaded; remove the trimmer head from the grass to allow it to recover. If the battery pack or trimmer is too hot, allow them to cool down. Also, verify the battery pack is correctly installed and charged.
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Karen DuranAug 9, 2025
What to do if GreenWorks Tools Trimmer fails to start?
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  April ManningAug 9, 2025
  If your GreenWorks Tools Trimmer fails to start, there are several potential causes. First, ensure the battery pack is properly attached to the trimmer. Check for and correct any lack of electrical contact between the trimmer and battery by removing and reinstalling the battery pack. A depleted battery pack will also prevent starting, so charge it. Finally, make sure you are pressing down the lock-off lever and holding it while depressing the trigger to turn on the string trimmer.
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Ian ThomasAug 14, 2025
Why is the line not cutting well on my GreenWorks Tools ST40L210?
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  hicksjuliaAug 15, 2025
  If the line on your GreenWorks Tools Trimmer isn't cutting well, the line-cutting blade on the edge of the guard may have become dull. Sharpen the blade with a file or replace it with a new one.
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Trevor EstradaAug 20, 2025
What to do if grass wraps around the trimmer head and motor housing of GreenWorks Tools ST40L210 Trimmer?
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  gary85Aug 20, 2025
  If grass is wrapping around the trimmer head and motor housing of your GreenWorks Tools Trimmer, it's likely due to cutting tall grass at ground level. Cut tall grass from the top down, removing no more than 8 inches in each pass to prevent wrapping.
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eperkinsAug 25, 2025
Why won't the line advance on my GreenWorks Tools ST40L210 Trimmer?
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  Lauren SchwartzAug 25, 2025
  If the line won't advance on your GreenWorks Tools Trimmer, consider these possibilities: 1. The lines may be welded together, in which case you should lubricate them with silicone spray. 2. There might not be enough line on the spool. 3. The lines could be worn too short – try pulling both lines while pressing the button. 4. The lines might be tangled on the spool.
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Taylor VangAug 30, 2025
Why does the line keep breaking on my GreenWorks Tools ST40L210 Trimmer?
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  Michele JonesAug 30, 2025
  If the line on your GreenWorks Tools Trimmer keeps breaking, it might be due to incorrect usage. Only trim with the tip of the line, avoiding stones, walls, and other hard objects. Feed the line regularly to maintain full cutting width.

Summary

Product Specifications

40 V Lithium-Ion String Trimmer

Specifications for the 40V Lithium-Ion String Trimmer, covering type, motor, width, line, speed, feed, and weight.

Important Safety Instructions

Symbols

Know Your String Trimmer

Rear Handle

Description of the ergonomic rear handle for improved comfort and grip.

Auxiliary Handle

Details on the auxiliary handle for added control and ease of operation.

Coupler

Explanation of the coupler that connects the upper and lower shafts of the trimmer.

Guard

Information about the guard that helps protect from flying debris during use.

Variable Speed Trigger

Details on the variable speed trigger that provides added control and precision.

Safety Lock-Out Button

Explanation of the safety lock-out button designed to prevent accidental starting.

Assembly

Unpacking

Instructions for unpacking the string trimmer, checking contents, and inspecting for damage.

Attaching the Edge Guide

Steps for attaching the edge guide to limit cutting range and reduce damage risk.

Attaching the Guard

Procedure for installing the guard onto the trimmer head using screws.

Installing the Upper Shaft to the Lower Shaft

Guide on how to connect the upper and lower shafts using the coupler device.

Attaching the Auxiliary Handle

Steps for mounting the auxiliary handle onto the upper shaft for comfortable operation.

Adjusting the Cutting Swath

Instructions for changing the cutting swath from 14 to 16 inches by rotating the blade.

Operation

Installing the Battery Pack

Procedure for inserting the battery pack into the trimmer, aligning ribs and ensuring latch clicks.

Removing the Battery Pack

Steps for safely removing the battery pack by depressing the release button.

Starting and Stopping the Trimmer

How to start the trimmer by pressing the safety lock and trigger, and how to stop it.

Operating the Trimmer

Tips for holding the trimmer, cutting tall grass, and clearing wrapped grass.

Advancing Line

Explanation of the bump feed line advancement system that extends line when bumped.

Replacing the Bump Knob

Instructions for removing the old bump knob and installing a new one onto the spool housing.

Replacing the Line

Detailed steps for removing the spool cover, replacing the line, and reinstalling components.

Cutting Tips

Advice on optimal cutting techniques, avoiding debris, and protecting against damage.

Battery & Charger Maintenance

Checking Battery Capacity

How to check the battery charge level using the BCI button and indicator lights.

Charging Procedure

Steps for charging the battery pack and understanding the charger's LED status indicators.

Checking the Charge

Troubleshooting steps for charging issues, including outlet, contacts, and temperature checks.

Charger Mounting

Instructions for securely mounting the battery charger on a wall using screws.

Maintenance

General Maintenance

Routine maintenance tasks for the string trimmer, including visual checks and frequency of tasks.

Environmentally Safe Battery Disposal

Troubleshooting

String trimmer fails to start when trigger lock button is depressed

Troubleshooting steps for when the trimmer fails to start due to battery or trigger issues.

String trimmer stops while cutting

Solutions for when the string trimmer stops during operation, covering overload or overheating.

Lines will not advance

Causes and solutions for the trimmer line not advancing, including welding or tangling.

Line keeps breaking

Troubleshooting steps for when the trimmer line breaks frequently, often due to incorrect use.

Grass wraps around trimmer head and motor housing

Solutions for grass entanglement around the trimmer head, focusing on cutting technique.

Line is not cutting well

Tips for improving cutting performance when the line-cutting blade becomes dull.

Limited Warranty

Exploded View

Parts List