1. Important Safety Information
Before operating the Greenworks GST1246 Electric Trimmer and Brushcutter, it is crucial to read and understand all safety warnings and instructions provided in this manual. Failure to follow these instructions may result in electric shock, fire, and/or serious injury. Keep this manual for future reference.
Anticipated Safety Warnings:
- Always wear appropriate personal protective equipment (PPE), including eye protection, hearing protection, long pants, and sturdy footwear.
- Ensure the work area is clear of other people, children, and pets.
- Inspect the tool for damage before each use. Do not operate if damaged.
- Disconnect the power supply before performing any maintenance, cleaning, or when changing accessories.
- Avoid operating in wet conditions or rain.
- Use only Greenworks approved replacement parts and accessories.
2. Product Overview
The Greenworks GST1246 is a versatile electric trimmer and brushcutter designed for efficient lawn and garden maintenance. It features a powerful 1200W motor and a 40cm cutting width, capable of handling various vegetation types.

Figure 2.1: Overview of the Greenworks GST1246 Electric Trimmer and Brushcutter, highlighting key components such as the lock-out button, wrap-around handle, 2.0 mm dual quiet line, 40 cm cutting path, and bump feed head.
Key Features:
- Easy Operation: Plug-and-play design with a 1200W electric motor, eliminating the need for gas or oil filters.
- Precise Edging: Automatic 2mm line feed for consistent cutting without manual line adjustment.
- Functional Design: Two-piece aluminum shaft with steel connection for stability and an adjustable additional handle for improved reach and control.
- Lightweight: Weighs 4.5 kg, offering a good power-to-weight ratio for easier handling.
- AC-Platform: Suitable for small gardens, providing maximum performance and convenience.
3. Setup
The Greenworks GST1246 requires some assembly before first use. Follow these steps carefully:
- Unpack Components: Carefully remove all parts from the packaging. Verify that all components listed in the packing list are present and undamaged.
- Assemble Shaft: Connect the two sections of the aluminum shaft. Ensure they click securely into place.
- Attach Guard: Secure the safety guard to the trimmer head using the provided fasteners. Ensure it is firmly attached to protect against debris.
- Install Additional Handle: Slide the adjustable additional handle onto the shaft. Position it for comfortable operation and tighten the locking mechanism.
- Select Cutting Attachment: The tool can use either a 2mm cutting line or a blade. Install the appropriate attachment for your task. Refer to the specific instructions for line spool or blade installation.

Figure 3.1: The Greenworks GST1246 Electric Trimmer and Brushcutter with its included blade attachment, ready for assembly.
4. Operating Instructions
Operating the Greenworks GST1246 safely and effectively requires proper technique and awareness of your surroundings.
Starting and Stopping:
- To Start: Connect the power cord to a suitable 230V outlet. Press and hold the lock-out button, then squeeze the trigger switch.
- To Stop: Release the trigger switch.
Cutting Techniques:
- Trimming: Hold the trimmer at a slight angle, allowing the line to cut the grass. Use a sweeping motion from side to side.
- Edging: Rotate the trimmer head to a vertical position (if applicable) or tilt the tool to cut along edges of sidewalks and driveways.
- Brushcutting: When using the blade, approach thicker vegetation slowly. Use a controlled, deliberate motion to cut through dense growth.

Figure 4.1: An operator using the Greenworks electric trimmer to clear weeds and maintain garden areas, demonstrating proper handling and posture.

Figure 4.2: The trimmer being used for precise edging along a paved path, showcasing its maneuverability for detailed work.
Line Feed System:
The GST1246 features a bump feed head. To advance the cutting line, gently tap the trimmer head on the ground while the motor is running. The line will automatically extend.

Figure 4.3: A detailed view of the bump feed head, illustrating the mechanism for quick and easy line advancement during operation.
5. Maintenance
Regular maintenance ensures optimal performance and extends the lifespan of your Greenworks GST1246.
- Cleaning: After each use, disconnect the power and clean the tool. Remove grass clippings, dirt, and debris from the motor housing, air vents, and cutting head. Use a damp cloth; do not use harsh chemicals or abrasive cleaners.
- Line Replacement: When the cutting line becomes too short, replace the spool with a new 2mm diameter line. Follow the instructions provided with the replacement line for proper installation.
- Blade Inspection/Replacement: If using the blade attachment, inspect it regularly for damage, dullness, or cracks. Replace damaged blades immediately. Ensure the blade is securely fastened.
- Storage: Store the trimmer in a dry, secure location, out of reach of children. Ensure the power cord is neatly coiled and not kinked.
6. Troubleshooting
This section addresses common issues you might encounter with your Greenworks GST1246.
| Problem | Possible Cause | Solution |
|---|---|---|
| Tool does not start | No power supply; Lock-out button not pressed; Faulty switch | Check power connection; Ensure lock-out button is pressed before trigger; Contact service if switch is faulty. |
| Cutting line does not advance | Line tangled or jammed; Spool empty; Incorrect line installation | Disconnect power, clear any tangles; Replace line spool; Reinstall line correctly. |
| Reduced cutting performance | Dull line/blade; Motor overloaded by thick vegetation; Debris in cutting head | Replace line/blade; Cut smaller sections at a time; Disconnect power and clear debris. |
| Excessive vibration | Damaged or unbalanced blade/spool; Loose components | Inspect and replace damaged parts; Tighten all fasteners. |
7. Specifications
- Model: GST1246 (1301807)
- Brand: Greenworks
- Power Source: Electric Cord
- Voltage: 230V
- Motor Power: 1200W
- Cutting Width: 40 cm
- Line Diameter: 2 mm
- Speed: 5500 RPM
- Product Dimensions: 173 x 39.7 x 25 cm
- Product Weight: 4.5 kg
- Assembly Required: Yes
- Country of Origin: China
8. Warranty and Support
Greenworks provides a three-year product warranty for the GST1246 Electric Trimmer and Brushcutter, covering defects in materials and workmanship under normal use. Please retain your proof of purchase for warranty claims.

Figure 8.1: Greenworks 3-year product warranty emblem, signifying the coverage period for the tool.
For technical assistance, warranty service, or to order replacement parts, please contact Greenworks customer support through their official website or the retailer where the product was purchased. Ensure you have your model number (GST1246) and serial number (if applicable) ready when contacting support.





