How To Change The String On A Weed Wacker

Preparing to Replace the String

Prior to initiating the string replacement, disconnect the weed wacker from its power source. This applies to both electric and gas-powered models. For electric units, unplug the power cord. For gas-powered units, ensure the engine is off and allow it to cool completely before proceeding. Spark plug disconnection may be necessary according to the manufacturer's guidelines, which can be found in the owner's manual.

Gather the necessary materials. These typically include:

• New trimmer line of the correct diameter and length, as specified in the owner's manual.
• Work gloves for hand protection.
• Safety glasses to protect the eyes from debris.
• The appropriate tools for disassembling the trimmer head, if required by the model (e.g., screwdrivers, wrenches). Refer to the owner's manual for specific tool requirements.
• A clean workspace.

Identifying the Trimmer Head Type

Trimmer heads vary in design. Common types include:

• Bump-feed heads: Line is advanced by tapping the head on the ground.
• Automatic-feed heads: Line is automatically advanced.
• Manual-feed heads: Line is advanced manually.
• Fixed-line heads: Pre-cut line segments are inserted into the head.

The owner's manual is the definitive resource for identifying the specific type of trimmer head and understanding its disassembly and reassembly procedures.

Replacing String on a Bump-Feed Trimmer Head

Bump-feed trimmer heads are commonly found on many weed wacker models.

Disassembling the Trimmer Head

Most bump-feed heads require depressing tabs or buttons located on the side of the spool housing to release the spool. Consult the owner's manual for the exact location and method for releasing the spool. Some models may require unscrewing the bump knob.

Once the spool is released, carefully remove it from the housing. Note the orientation of the spool and any internal components, such as springs or washers. This facilitates proper reassembly. Take a picture of the disassembled components for reference.

Remove any remaining old trimmer line from the spool. Examine the spool for any damage, such as cracks or chips. If damage is present, replace the spool.

Winding the New Trimmer Line

Determine the required length of trimmer line. This information is typically found in the owner's manual or imprinted on the trimmer head itself. Avoid exceeding the recommended length, as this can affect the trimmer's performance and potentially damage the motor.

Locate the line anchor point on the spool. This is usually a hole or slot. Insert one end of the trimmer line into the anchor point and wind the line tightly and evenly around the spool in the direction indicated by the arrows on the spool. Overlapping or uneven winding can cause the line to jam or break prematurely.

If the spool has two sections for winding separate lines, divide the total line length in half and wind each section accordingly, following the directional arrows for each section. Secure the ends of the line in the retaining slots or notches on the spool to prevent unwinding during reassembly.

Reassembling the Trimmer Head

Carefully reinsert the spool into the trimmer head housing, ensuring that it is oriented correctly. Refer to the notes or photographs taken during disassembly.

Align the line exit holes in the spool housing with the corresponding holes in the trimmer head. Thread the ends of the trimmer line through these holes.

Reattach the spool housing to the trimmer head by pressing the release tabs or buttons until they click into place. If the model requires screwing on the bump knob, tighten it securely, but avoid over-tightening.

Replacing String on a Fixed-Line Trimmer Head

Fixed-line trimmer heads utilize pre-cut lengths of trimmer line that are inserted into the head.

Removing Old Lines

Pull out the old, worn-out line segments from the retaining holes or slots in the trimmer head. Some resistance may be encountered depending on how securely the lines are held.

Inserting New Lines

Cut new trimmer line segments to the length specified in the owner's manual. Using the correct length is crucial for balance and performance.

Insert one end of a new line segment into a retaining hole or slot. Push the line firmly until it is securely seated. Repeat this process for all the retaining holes, ensuring that all line segments are of equal length.

Replacing String on Automatic-Feed and Manual-Feed Heads

Automatic-feed and manual-feed heads often have unique mechanisms for line advancement. The procedures outlined below are general guidelines, and the owner's manual should be consulted for specific instructions.

Disassembly and Reassembly

Disassembly usually involves removing a cover or cap to access the spool. The method for releasing the cover varies depending on the model. Some may require unscrewing, while others may have snap-fit closures.

The spool removal process is similar to that of bump-feed heads, requiring careful observation of the orientation and position of internal components.

Winding the new trimmer line follows the same principles as with bump-feed heads: ensuring the correct length, winding direction, and even distribution on the spool.

Reassembly involves reversing the disassembly process, taking care to align all components correctly and secure the cover or cap properly.

Specific Considerations

Automatic-feed heads: These heads often have intricate mechanisms for line advancement. Pay close attention to the arrangement of springs, gears, and other small parts during disassembly. Ensure that these components are properly lubricated during reassembly.

Manual-feed heads: These heads typically have a knob or lever that is used to manually advance the line. Ensure that the line is properly aligned with the feed mechanism during reassembly.

Post-Replacement Checks and Maintenance

After replacing the trimmer line, perform a test run to ensure that the trimmer is functioning correctly. Start the engine (or plug in the electric unit) and allow it to run at idle speed. Observe the trimmer head for any unusual vibrations or noises.

Increase the engine speed (or adjust the speed control on the electric unit) and check that the trimmer line advances properly when the bump-feed mechanism is activated (if applicable). For fixed-line heads, ensure the lines remain securely in place.

Inspect the trimmer head regularly for wear and tear. Replace worn or damaged parts as needed. Clean the trimmer head after each use to remove debris and prevent clogging. Store the weed wacker in a dry, protected area.

Troubleshooting Common Issues

Line breaks frequently: This could be due to using the wrong type or diameter of trimmer line, winding the line unevenly, or using the trimmer against abrasive surfaces.

Line won't advance: This could be due to the line being tangled on the spool, the spool being incorrectly installed, or a malfunctioning feed mechanism.

Trimmer head vibrates excessively: This could be due to unbalanced trimmer lines, a damaged spool, or a loose trimmer head.

Consult the owner's manual for specific troubleshooting steps and diagrams.

Safety Precautions

Always wear safety glasses and work gloves when replacing trimmer line.

Disconnect the power source before working on the trimmer.

Keep hands and feet away from the trimmer head when the trimmer is running.

Never operate the trimmer without the safety guard in place.

Read and understand the owner's manual before using the trimmer.

Key Takeaways

Correct trimmer line replacement involves selecting the correct line type, proper winding, and careful reassembly.

The owner's manual is the primary resource for model-specific instructions and safety guidelines.

Regular maintenance and inspection extend the life of the weed wacker and ensure safe operation.

Addressing common issues promptly prevents further damage and optimizes performance.