SOYUS SF8A220

SOYUS 12-Inch Cordless String Trimmer User Manual

Model: SF8A220

Introduction

Thank you for choosing the SOYUS 12-Inch Cordless String Trimmer. This versatile 20V electric tool is designed for efficient trimming and edging of lawns and gardens. Its lightweight and compact design, combined with an automatic wire feed and adjustable head, makes it ideal for various landscaping tasks. Please read this manual thoroughly before operation to ensure safe and effective use of your new tool.

Important Safety Information

Always follow basic safety precautions when using electric tools to reduce the risk of fire, electric shock, and personal injury.

  • Read All Instructions: Familiarize yourself with the controls and proper use of the tool.
  • Wear Eye Protection: Always wear safety glasses or goggles when operating the trimmer.
  • Wear Appropriate Clothing: Long pants, sturdy footwear, and gloves are recommended. Avoid loose clothing or jewelry that could get caught in moving parts.
  • Keep Area Clear: Ensure the work area is clear of debris, rocks, and other objects that could be thrown by the cutting line. Keep bystanders, children, and pets at a safe distance.
  • Inspect Before Use: Check the trimmer for any damaged parts, loose fasteners, or worn cutting line before each use.
  • Battery Safety: Use only the specified battery pack and charger. Do not expose batteries to extreme temperatures or water.
  • Avoid Accidental Starting: Ensure the safety lock is engaged when not in use or when performing maintenance.
  • Maintain Good Balance: Always maintain proper footing and balance while operating the trimmer.
  • Do Not Overreach: Do not overextend your body while operating the tool.
  • Disconnect Battery: Always remove the battery pack before cleaning, servicing, or storing the tool.

Package Contents

Verify that all items are present and in good condition upon opening the package.

  • 1 x SOYUS Lawn Mower (Trimmer/Edger Unit)
  • 1 x 2.0Ah Battery Pack
  • 1 x Quick Charger
  • 8 x Spools (Trimmer Lines)
  • 1 x Support Wheel
  • 1 x Safety Guard
SOYUS 12-Inch Cordless String Trimmer with battery, charger, and 8 replacement spools
Figure 1: Complete package contents of the SOYUS Cordless String Trimmer.
Diagram showing all included components of the SOYUS string trimmer kit.
Figure 2: Visual representation of the items included in the package.

Setup and Assembly

Follow these steps to assemble your SOYUS String Trimmer before first use.

  1. Assemble the Shaft: Connect the two sections of the shaft. Ensure the protruding part of one section is fully embedded into the depression of the other. Secure by turning the black knob.
  2. Attach the Safety Guard: Locate the metal guard and insert its ends into the designated holes on the trimmer head. Then, align the plastic safety guard with the trimmer head and secure it with the provided screw. Ensure the cutting line passes through the opening in the guard.
  3. Install the Support Wheel: Insert the support wheel assembly into the slot on the trimmer head until it clicks into place. This wheel aids in edging.
  4. Insert Battery: Slide the fully charged battery pack into the battery slot on the handle until it locks securely.
  5. Adjust Front Handle: Loosen the knob on the front handle and adjust it to a comfortable operating position. Tighten the knob to secure.
Diagram of SOYUS string trimmer with labeled parts including trigger switch, lock off button, front handle, edger function switch, shaft adjustment lock, edger wheel, 12-inch cutting path, auto feed head, and 0.065-inch quiet line.
Figure 3: Labeled components of the SOYUS String Trimmer.
Step-by-step diagram showing simple installation of the trimmer shaft by inserting and securing with a black knob.
Figure 4: Simple installation steps for the trimmer shaft.

Video 1: Official installation guide for the SOYUS SY8A220 String Trimmer.

Operating Instructions

Starting and Stopping

  • To start the trimmer, press the safety lock-off button (usually located on the side of the handle) and then squeeze the trigger switch.
  • To stop the trimmer, release the trigger switch.

Trimming Operation

  • Hold the trimmer firmly with both hands.
  • Keep the cutting head parallel to the ground for even trimming.
  • Move the trimmer slowly and steadily across the area to be trimmed.
  • The automatic wire feed system will advance the line as needed.
  • Use the edge protection guard to prevent damage to plants and landscaping.
SOYUS string trimmer in use, showing the 12-inch cutting path and edge guard protecting plants.
Figure 5: Trimming with the 12-inch cutting path and edge guard.
Close-up of the trimmer head showing the automatic line feed mechanism with arrows indicating line advancement.
Figure 6: Automatic line feed in action.

Edging Operation

  • To convert to edger mode, rotate the trimmer head 90 degrees using the edger function switch.
  • Position the support wheel along the edge of the pavement or garden bed.
  • Walk slowly, guiding the trimmer along the desired edge.
Person using the SOYUS trimmer in edger mode, with the head rotated 90 degrees to trim along a sidewalk.
Figure 7: Converting the trimmer to edger mode.
Overhead view of the trimmer head showing its 2-in-1 trimmer and edger functionality.
Figure 8: The 2-in-1 trimmer and edger design.

Adjustable Head

  • The mower head can be adjusted up to 90 degrees to help you trim slopes, edges, and hard-to-reach areas.
  • Refer to the product diagram for the adjustable head mechanism.
Diagram showing the adjustable head of the trimmer, indicating rotation for easy trimming and edging at multiple angles.
Figure 9: Adjustable head for versatile trimming and edging.

Maintenance

Regular maintenance ensures optimal performance and extends the life of your trimmer.

  • Cleaning: After each use, disconnect the battery and clean the trimmer head and guard with a damp cloth. Remove any grass clippings or debris.
  • Line Replacement: The trimmer comes with 8 spare spools. When the cutting line runs out, replace the spool with a new one. Refer to the assembly video for guidance on accessing the spool compartment.
  • Battery Care: Store the battery in a cool, dry place. Do not store the battery in a discharged state for extended periods.
  • Storage: Store the trimmer in a dry, secure location out of reach of children.

Troubleshooting

This section addresses common issues you might encounter.

ProblemPossible CauseSolution
Trimmer does not start.Battery not inserted correctly; Battery discharged; Safety lock not engaged; Faulty trigger switch.Ensure battery is fully seated; Charge battery; Press safety lock button before squeezing trigger; Contact customer support if switch is faulty.
Cutting line does not advance.Spool empty; Line tangled; Debris in head.Replace spool; Clear any tangles or debris from the trimmer head.
Reduced cutting performance.Worn or short cutting line; Battery low.Replace cutting line spool; Recharge battery.
Battery does not charge.Charger not plugged in; Faulty charger or battery.Ensure charger is properly plugged into a working outlet; Contact customer support for replacement if charger or battery is faulty.

Specifications

FeatureDetail
BrandSOYUS
Model NumberSF8A220
Power SourceBattery Powered (20V Lithium-Ion)
Cutting Width12 Inches
Product Dimensions42.91"L x 7.87"W
Item Weight7.7 pounds
Assembly RequiredYes
ColorGREEN
Country of OriginChina

Warranty and Support

For warranty information, technical support, or to purchase replacement parts, please contact SOYUS customer service. Refer to the product packaging or the SOYUS official website for the most up-to-date contact details.

You can also visit the SOYUS Store on Amazon for more product information and support resources.

© 2025 SOYUS. All rights reserved.

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