Greenworks Pro 80V Brushless Line Trimmer 406mm - Operator Manual - STB409

Oct 28, 2026

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Operator manual for the Greenworks Pro 80V brushless line trimmer model STB409. Describes its intended use for cutting grass, light weeds, and similar vegetation near ground level, plus an overview of key components including handles, trigger, speed switch, shafts, motor housing, trimmer head, guard, and cut-off blade. Includes comprehensive safety instructions, machine symbols and risk levels, installation steps (unpack, guard, shaft, auxiliary handle, battery pack), operation procedures, maintenance tasks, transportation and storage guidance, technical data, troubleshooting, limited warranty, and an exploded view.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages14

Reading Time35 min

AccessFree to download

1 Description

1.1 Purpose

1.2 Overview

2 Important safety instructions

3 Symbols on the machine

4 Risk levels

5 Service

6 Environmentally safe battery disposal

7 Proposition 65

8 Installation

8.1 Unpack the machine

8.2 Attach the guard

8.3 Assemble the shaft

8.4 Attach the auxiliary handle

8.5 Install the battery pack

8.6 Remove the battery pack

9 Operation

9.1 Start the machine

9.2 Stop the machine

9.3 Adjust the length of the cutting line

9.4 Adjust the cutting diameter

9.5 Line cut-off blade

9.6 Operation tips

9.7 Cutting tips

10 Maintenance

10.1 General information

10.2 Clean the machine

10.3 Remove excess line

10.4 Install the cutting line

11 Transportation and storage

11.1 Move the machine

11.2 Store the machine

12 Technical data

13 Troubleshooting

14 Limited warranty

15 Exploded view

EN FR ES STRING TRIMMER COUPE-HERBE CORTABORDES OPERATOR MANUAL MANUEL D’OPÉRATEUR MANUAL DEL OPERADOR STB409 [www.greenworkstools.com](www.greenworkstools.com) English EN 1 Description............................. 4 1.1 Purpose...........................................4 1.2 Overview......................................... 4 2 Important safety instructions............................ 4 3 Symbols on the machine.......6 4 Risk levels.............................. 6 5 Service.................................... 6 6 Environmentally safe battery disposal..................... 6 7 Proposition 65........................ 7 8 Installation.............................. 7 8.1 Unpack the machine....................... 7 8.2 Attach the guard............................. 7 8.3 Assemble the shaft......................... 7 8.4 Attach the auxiliary handle..............8 8.5 Install the battery pack.................... 8 8.6 Remove the battery pack................8 9 Operation................................ 8 9.1 Start the machine............................8 9.2 Stop the machine............................ 9 9.3 Adjust the length of the cutting line.......................................9 9.4 Adjust the cutting diameter............. 9 9.5 Line cut-off blade............................ 9 9.6 Operation tips..................................9 9.7 Cutting tips ................................... 10 10 Maintenance......................... 10 10.1 General information...................... 10 10.2 Clean the machine........................ 10 10.3 Remove excess line...................... 10 10.4 Install the cutting line.....................11 11 Transportation and storage.................................. 12 11.1 Move the machine........................ 12 11.2 Store the machine......................... 12 12 Technical data...................... 12 13 Troubleshooting................... 12 14 Limited warranty.................. 13 15 Exploded view...................... 15 EN English 1 DESCRIPTION 1.1 PURPOSE This machine is used to cut grass, light weeds, and other similar vegetation at or around ground level. The cutting plane must be approximately parallel to the ground surface. You cannot use the machine to cut or chop hedges, shrubs, bushes, flowers and compost. 1.2 OVERVIEW 10 1 Battery release button 2 Rear handle 3 Lock-out button 4 Trigger 5 Speed switch 6 Upper shaft 7 Auxiliary handle 8 Coupler 9 Lower shaft 10 Motor housing 11 Trimmer head 12 Cut-off blade 13 Guard 2 IMPORTANT SAFETY INSTRUCTIONS READ ALL INSTRUCTIONS BEFORE USING THIS POWER TOOL | WARNING | | --- | | Read and understand all instructions before using this product. Failure to follow all instructions listed below may result in electric shock, fire, and/or serious personal injury. | • Use only identical manufacturer’s replacement parts and accessories. Use of any other parts may create a hazard or cause product damage. • Always wear safety glasses with side shields marked to comply with ANSI Z87 .1. Everyday glasses have only impact resistant lenses. They are NOT safety glasses. Following this rule will reduce the risk of eye injury. Use face mask if operating industy workspaces. • Avoid Dangerous Environment – Do not expose power tools to prolonged or heavy wet conditions. Water entering a power tool will increase the risk of electric shock. • Use the machine only in daylight or good artificial light. • Do not use in rain. Avoid using the machine in bad weather conditions especially when there is a risk of lightning. • Never operate the machine with damaged guards or shields or without guards or shields in place. • Keep all bystanders, children, and pets at least 50 ft. away. • Dress Properly – Do not wear loose clothing or jewelry. They can be caught in moving parts. Use of rubber gloves and substantial footwear is recommended wh

FAQs

What vegetation can the STB409 trimmer cut?

It is used to cut grass, light weeds, and similar vegetation at or around ground level. The manual states it cannot be used to cut or chop hedges, shrubs, bushes, flowers, or compost.

What are the key safety requirements before operating?

Read and understand all instructions before use, wear safety glasses with side shields, avoid wet conditions, operate only in daylight or good artificial light (do not use in rain), and keep guards/shields in place.

How do you install and remove the battery pack?

The installation section provides steps to install the battery pack and remove it, following the order of unpacking, attaching the guard, assembling the shaft, attaching the auxiliary handle, then installing/removing the battery pack as instructed.

Oct 28, 2026

Upload by Tirek