Instruction Manual for Ewon Gear Head

1. Product Overview

This manual provides essential information for the safe and effective use of your Ewon Gear Head. This component is designed as a replacement part for specific Stihl brushcutter and clearing saw models, ensuring proper power transmission to the cutting attachment.

1.1 Key Features

• Designed for Stihl FS260, FS311, FS360, FS410, FS460, FS490 series brushcutters and clearing saws.
• Features a 28mm drive tube and 9-tooth drive shaft for precise fitment.
• Equipped with an M12 x 1.5mm left-hand thread collar nut.
• Direct replacement for original part numbers 4147 640 0103 and 4147 640 0104.
• Constructed for durability and reliable performance.

1.2 Package Contents

• 1 x Gear Head Assembly
• Associated fasteners (as shown in product images)

Figure 1.1: The Ewon Gear Head, a replacement component for Stihl brushcutters and clearing saws. This image shows the complete gear head assembly.

Figure 1.2: Detailed view of the gear head showing the 28mm drive tube diameter and the 9-tooth spline count, crucial for compatibility verification.

Figure 1.3: Exploded view of the gear head and its associated components, including the drive shaft, collar nut, and mounting hardware.

2. Safety Information

Always prioritize safety when working with power tools and replacement parts. Failure to follow safety instructions can result in serious injury or damage to equipment.

• Read the Original Equipment Manual: Before installing or using this gear head, thoroughly read and understand the instruction manual for your specific Stihl brushcutter or clearing saw.
• Personal Protective Equipment (PPE): Always wear appropriate PPE, including safety glasses, gloves, and hearing protection, when handling or installing the gear head.
• Disconnect Power: Ensure the brushcutter/clearing saw is turned off and the spark plug cap is removed (for gasoline models) or the battery is disconnected (for electric models) before beginning any installation or maintenance.
• Verify Compatibility: Double-check that the drive tube diameter (28mm) and drive shaft spline count (9-tooth) of your equipment match the specifications of this gear head. Incorrect fitment can lead to damage or unsafe operation.
• Secure Fasteners: Ensure all bolts and nuts are tightened securely to the manufacturer's specifications to prevent loosening during operation.
• Professional Installation: If you are unsure about any installation steps, consult a qualified service technician.

3. Setup and Installation

Proper installation is crucial for the performance and longevity of the gear head. Follow these steps carefully.

3.1 Pre-Installation Check

• Confirm your brushcutter's drive tube has a 28mm diameter.
• Verify your brushcutter's drive shaft has 9 splines.
• Ensure the existing collar nut is M12 x 1.5mm left-hand thread.
• Inspect the new gear head for any visible damage from shipping.

3.2 Installation Steps

1. Prepare the Equipment: Ensure the brushcutter is turned off, cooled down, and the spark plug cap is removed (or battery disconnected). Place the equipment on a stable, flat surface.
2. Remove Old Gear Head: Carefully loosen and remove any bolts or clamps securing the old gear head to the drive tube. Disconnect the drive shaft from the old gear head. Note the orientation of all components for reassembly.
3. Clean Drive Tube: Clean the end of the drive tube to ensure a smooth fit for the new gear head.
4. Insert Drive Shaft: Carefully slide the new gear head onto the drive shaft, ensuring the 9-spline shaft aligns correctly with the gear head's internal mechanism.
5. Secure to Drive Tube: Slide the gear head onto the drive tube. Align the mounting holes and insert the securing bolts. Tighten these bolts firmly, but do not overtighten, to secure the gear head to the drive tube.
6. Attach Cutting Attachment: Reattach your cutting blade or string trimmer head to the gear head using the M12 x 1.5mm left-hand thread collar nut. Ensure it is tightened securely. Remember, this is a left-hand thread, so you turn clockwise to loosen and counter-clockwise to tighten.
7. Final Check: Before starting the equipment, manually rotate the cutting attachment to ensure it spins freely and there are no obstructions. Double-check all fasteners for tightness.

Figure 3.1: Illustration of the gear head components, including the drive shaft and the M12 x 1.5mm left-hand thread nut, essential for correct assembly.

4. Operating Instructions

Once the gear head is correctly installed, operate your brushcutter or clearing saw according to its original manufacturer's instructions. The gear head functions as a direct replacement and does not alter the operational procedures of the main equipment.

• Ensure the cutting attachment is securely fastened before each use.
• Listen for any unusual noises or vibrations during operation, which may indicate an issue with the gear head or other components.
• Do not operate the equipment if the gear head feels loose or damaged.

5. Maintenance

Regular maintenance helps prolong the life of your gear head and ensures safe operation.

5.1 Cleaning

• After each use, clean any grass, dirt, or debris from the exterior of the gear head.
• Use a brush or cloth; avoid using high-pressure water directly on the gear head, as this can force water into seals.

5.2 Inspection

• Periodically inspect the gear head for signs of wear, cracks, or damage.
• Check that all mounting bolts remain tight.
• Inspect the drive shaft connection for any play or wear.

5.3 Lubrication

The gear head contains internal lubrication. If you notice excessive noise or heat, it may indicate a need for professional servicing or replacement. Do not attempt to disassemble the gear head for lubrication unless you are a qualified technician.

6. Troubleshooting

This section addresses common issues you might encounter with the gear head.

7. Specifications

8. Warranty and Support

8.1 Warranty Information

This Ewon Gear Head comes with a warranty period of 6 months from the date of purchase. This warranty covers manufacturing defects and material flaws under normal use. Please retain your proof of purchase for warranty claims.

8.2 Customer Support

If you have any questions regarding the installation, operation, or maintenance of your Ewon Gear Head, or if you encounter any issues, please contact our customer support team. We aim to answer all inquiries within 24 hours.

For support, please refer to the contact information provided with your purchase or visit the Ewon official website.