Understanding Your Strimmer Head and Line
Ensuring your strimmer is ready for action often comes down to a seemingly minor, yet crucial, maintenance task: fitting new wire. This process, also known as loading the strimmer head, allows your tool to cut through grass and weeds effectively. While most modern strimmers use nylon line, the exact method can vary depending on the type of head fitted to your particular model.
The most common types of strimmer heads are the bump-feed (or auto-feed) and the fixed-line (or manual-feed) head. Bump-feed heads automatically release more line as you tap the head on the ground during operation, making them convenient for continuous work. Fixed-line heads require manual line insertion, often involving cutting specific lengths of line and feeding them through designated holes. Understanding which type you have is the first step to a successful line replacement.
Beyond the head type, the strimmer wire itself comes in various thicknesses, shapes (round, square, twisted, star) and materials. Thicker lines generally offer greater durability and cutting power for tougher vegetation, while thinner lines are suited for lighter trimming tasks and may be more compatible with less powerful strimmers. The shape of the line also influences its performance; twisted or serrated lines can cut more aggressively and quietly than standard round lines.
Choosing the Right Line
Selecting the correct diameter and type of line is vital. Always consult your strimmer's manual for the manufacturer's recommended line thickness. Using a line that is too thick can strain the strimmer's motor, potentially causing damage, while a line that is too thin may break prematurely, leading to frequent reloads. For general garden use, a 2mm to 2.4mm diameter nylon line is often suitable. For denser weeds or more powerful machines, you might consider a 2.7mm or even 3mm line.
The line's profile matters too. Round line is the most basic and common. Square or twisted lines provide sharper edges for a cleaner cut and can reduce noise. Multi-sided profiles, like star-shaped lines, offer enhanced cutting efficiency, particularly against thicker growth, but can wear down faster. If you frequently tackle tough brambles, a heavier-duty, perhaps twisted or composite, line might be a worthwhile investment.
The strimmer line's diameter and material are key considerations for performance and longevity.
Materials You'll Need
- New strimmer wire (correct diameter and type for your strimmer)
- Strimmer head (attached to your strimmer)
- Wire cutters or sharp scissors (for trimming excess line)
- Gloves (recommended for grip and protection)
- Your strimmer's instruction manual (highly recommended)
How to Fit Strimmer Wire: Method for Bump-Feed Heads
Many petrol and electric strimmers are equipped with a bump-feed head, which offers convenience by automatically advancing the line. Loading these heads typically involves winding a new length of line onto the internal spool.
Step-by-Step Loading for Bump-Feed Heads
First, ensure the strimmer is switched off and disconnected from its power source (unplug electric models, remove spark plug or battery for petrol ones). Locate the small tabs or slots on the side of the strimmer head. These are designed to help you separate the head's cap from the base. Push in these tabs simultaneously (or sometimes one at a time, depending on the design) and lift the cap off.
Once the cap is removed, you will see the spool of line. Some spools are designed to be removed entirely, while others are integrated into the head. If removable, take the spool out. You will find a central spindle or a notch where the existing line is secured. If there is old line remaining, remove it completely. Now, take your new line. For most heads, you'll need a single length of line, typically around 2-5 metres, depending on the spool size and line diameter. Check your manual for the precise recommended length and thickness.
Find the notch in the centre of the spool (or markings on the spool hub). Insert the end of the new line into this notch and begin winding it evenly and tightly around the spool in the direction indicated by an arrow on the spool or head. As you wind, ensure the line remains neat and does not cross over itself, which can cause it to jam. Leave about 10-15cm of line extending from the spool's outlet point or tap into the designated holes on the spool's edge, depending on the design.
If you are winding the line directly onto a spindle within the head, thread the line through the central hole and wind it evenly around the spindle, securing the ends as instructed. Regardless of the method, ensure the line is wound taut. After winding, carefully reassemble the head. Feed the ends of the line through the small eyelets or guide holes on the strimmer head's base, ensuring an equal amount of line emerges from each side. Then, replace the cap, aligning any markers or tabs, and push down firmly until it clicks into place. Test the line by gently tapping the head on a firm surface while the engine is running at a moderate speed to allow the line to feed out to the correct cutting length.
Loading strimmer wire correctly prevents tangles and ensures a consistent cutting performance.
Troubleshooting Bump-Feed Issues
If the line fails to feed out, the line may have been wound too loosely, too tightly, or have crossed over itself, creating a jam. In some cases, you might need to disassemble the head again and carefully re-spool it, ensuring the line is neat and the ends are correctly threaded through the eyelets. Some heads also have a manual feed option, often a small hole on the side of the head where you can insert a piece of wire to push the old line out and potentially help new line advance.
Always check your strimmer's manual for specific instructions for your model's bump-feed head.
Fitting Strimmer Wire: Manual and Fixed-Line Heads
Fixed-line or manual-feed strimmer heads offer a more direct approach to line replacement, often favoured for their simplicity and robustness, especially when dealing with tougher vegetation that might quickly wear down auto-feed systems.
Method for Fixed-Line Heads
As always, begin by ensuring your strimmer is powered off and safe to handle. Fixed-line heads typically feature two small holes on opposite sides of the head, running through the entire housing. These holes are designed to accept pre-cut lengths of strimmer line.
You will need to cut two equal lengths of strimmer wire. The required length varies by head size, but a common starting point is around 25-35cm per length, totalling 50-70cm of line. Again, your strimmer's manual is the best source for the exact specification for your head. Insert one end of a cut line into one of the holes on the head. Push the line all the way through until it emerges from the corresponding hole on the opposite side, leaving equal lengths sticking out from both sides. Secure this line by finding the groove or notch designed to hold it in place, usually located near the holes. Repeat the process with the second length of line, inserting it into the other pair of holes and securing it.
Some fixed-line heads simplify this by having a central spindle with two opposing slots. You would insert one end of a pre-cut line into a slot on one side, thread it through the spindle, and then insert the other end into the opposing slot. The line is then wrapped around the spindle. For heads that simply accept line through side holes, ensure the line is firmly seated in its retaining groove after insertion. The excess line will then be trimmed to the correct cutting length by the strimmer's own blade (a metal piece on the lower casing) as you start the tool.
Fixed-line heads require precise cutting and insertion of two equal lengths of nylon line.
Alternative to Fixed Lines: Pre-cut Trimmer Spools
For users who prefer the simplicity of fixed lines but want to avoid manual cutting and feeding, pre-cut trimmer spools are available for some models. These spools come with the line already wound and cut to the correct length and thickness for specific heads. You simply remove the old spool and insert the new one, often a much quicker process than winding line yourself, though typically more expensive per metre of line used.
Before cutting your line for a fixed-line head, double-check that the length is sufficient to protrude from both sides once secured in the grooves.
Optimising Strimmer Performance and Maintenance
Fitting the correct strimmer wire is only part of the equation for optimal performance. How you maintain the line and the head can significantly impact its efficiency and your tool's longevity.
Tips for Better Line Management
Store your spare strimmer wire in a dry place. Nylon line can absorb moisture over time, making it weaker and more prone to breaking. Some users recommend soaking new line in water for 24 hours before use to improve its flexibility and durability, although this is less critical with modern composite lines.
When winding line onto a spool for a bump-feed head, take your time to ensure it's wound neatly and evenly. A poorly wound spool is the most common cause of line-feeding problems. If your strimmer is struggling to cut through thicker material, check that the line is feeding out correctly and that it's not excessively worn down. If you find yourself constantly needing to tap the head to feed line, it could indicate the line is binding inside the spool.
Alternative Cutting Heads and Lines
Beyond standard nylon line, there are other cutting options. Some heavy-duty strimmers can accommodate heavier gauge lines, metal blades, or even specialized cutting heads designed for specific tasks like tackling dense brush or thick grass. While these can offer superior cutting power, they also require more power from the strimmer and may not be suitable for all models. Always check compatibility with your strimmer's specifications.
For domestic users, however, a well-maintained nylon line remains the most versatile and common choice. Experimenting with different line profiles – such as twisted or multi-sided options – can lead to a quieter operation and a cleaner cut, especially if you're looking to refine your approach to garden maintenance. If you find yourself frequently needing to sharpen tools, consider that while you sharpen hedge trimmer blades and pruning chainsaw chains, the strimmer line is your consumable cutting tool.
Regularly inspecting the strimmer head for wear or damage will ensure safe and effective operation.
When to Consider Professional Help
While fitting strimmer wire is a straightforward task, if you encounter persistent issues with your strimmer head, or if you're unsure about replacing parts or performing other maintenance tasks, it's always advisable to consult your owner's manual or seek assistance from a qualified service centre. This is particularly relevant if you're dealing with complex head designs or high-powered professional equipment.