Trimmer Spool Replacement Guide

Maintaining your grass trimmer is crucial for keeping your garden looking neat and tidy. One of the most common tasks involved in this maintenance is replacing the trimmer spool, also known as the line head or bump feed head. This component is responsible for feeding the cutting line, and when it runs out, your trimmer’s effectiveness diminishes significantly. Fortunately, replacing a trimmer spool is a relatively simple process that most homeowners can tackle with a few basic tools and a bit of patience. This guide will walk you through each step, ensuring you can get your trimmer back to its cutting best with minimal fuss.

Understanding Your Trimmer Spool

Before you begin, it's helpful to understand the different types of trimmer spools and how they work. Most modern grass trimmers use a dual-line bump feed head. This means it holds two lengths of trimmer line, and when the head is tapped against the ground (bumped), a mechanism releases more line. This automatic feeding system ensures you always have the optimal amount of line for cutting. Less common are manual feed heads, which require you to manually advance the line, or fixed line heads, which use pre-cut lengths of line.

The spool itself is a plastic reel that holds the trimmer line. Over time, the line will be used up, or the spool can become damaged. Replacing it is a routine part of trimmer upkeep, much like sharpening a mower blade or cleaning a chainsaw.

When to Replace Your Trimmer Spool

There are several indicators that signal it's time to replace your trimmer spool:

• No Line Feeding: The most obvious sign is when your trimmer stops cutting effectively because there's no line left to feed.
• Difficulty Feeding Line: If you have to repeatedly bump the head to get a small amount of line, or if the line gets tangled and won't feed, it's a strong indication the spool needs attention.
• Damaged Spool Housing: Physical damage to the spool housing, such as cracks or broken retaining clips, will necessitate a replacement.
• Worn Out Feed Mechanism: Sometimes, the internal mechanism that releases the line can wear out, even if there's line on the spool.

Tools and Materials You'll Need

To successfully replace your trimmer spool, gather the following:

• Replacement Trimmer Spool: Ensure you have the correct spool for your specific trimmer model. Check your trimmer's manual or the manufacturer's website for the part number. It's also possible to buy bulk trimmer line and rewind your existing spool, but replacing the entire unit is often quicker and easier.
• Gloves: Protect your hands from sharp edges and dirt.
• Safety Glasses: Essential for protecting your eyes from flying debris.
• Screwdriver or Nut Driver: Many trimmer heads are secured with screws or nuts.
• Pliers (optional): May be useful for removing stubborn parts.
• New Trimmer Line (if rewinding): Ensure it's the correct gauge and type for your trimmer.

Step-by-Step Guide to Replacing the Spool

Step 1: Safety First!

Before you do anything, ensure the trimmer is switched off and the power source (battery or mains) is disconnected. For petrol trimmers, remove the spark plug wire to prevent accidental starting. Always wear your safety glasses and gloves.

Step 2: Access the Trimmer Head

This is where trimmer models can vary. Most commonly, the trimmer head is secured to the drive shaft by a nut or a screw. You may need to hold the shaft in place to prevent it from spinning while you loosen the retaining fastener. Some trimmers have a small hole in the gear housing where you can insert a pin or screwdriver to lock the drive shaft. Consult your trimmer's manual if you're unsure how to access the head.

Step 3: Remove the Old Spool

Once the trimmer head is accessible, you'll need to remove the outer cover or cap. This is usually held in place by clips or a screw. Carefully pry off the cover. You should now see the old spool. Some spools are simply lifted out, while others might be held in place by a spring or a retaining clip. Note how the existing line is wound around the spool, especially if you plan to rewind it yourself.

If you are replacing the entire spool unit, you may not need to worry about the old line. Simply remove the old spool and any associated covers or springs.

Step 4: Prepare the New Spool

If you've purchased a pre-wound replacement spool, it's ready to go. If you are rewinding your existing spool, ensure you have the correct gauge and type of trimmer line. Typically, you'll need about 15-25 feet of line, depending on the spool capacity. Look for the small notches on the spool to anchor the end of the line. Wind the new line onto the spool evenly and in the same direction as the original winding. Avoid overlapping the line, as this can cause feeding issues. Leave a small length of line exposed, secured in the notches, ready to be threaded through the eyelets.

Step 5: Install the New Spool and Reassemble

Place the new (or rewound) spool onto the trimmer head spindle. Ensure it's seated correctly and that the ends of the trimmer line are threaded through the eyelets or guides on the trimmer head housing. Reassemble the spool cover, making sure any springs and retaining clips are in the correct position. Secure the cover by reattaching any screws or snapping the clips back into place.

Step 6: Reattach the Trimmer Head

Place the reassembled trimmer head back onto the drive shaft and secure it with the nut or screw you removed earlier. Tighten it firmly, but don't overtighten, as this could damage the threads.

Step 7: Test the Trimmer

Reconnect the power source (spark plug wire, battery, or mains plug). Start the trimmer and test the line feed. If it's a bump feed head, give it a gentle tap on the ground to release more line. Ensure the line is feeding smoothly and cutting effectively.

Troubleshooting Common Issues

Even with careful replacement, you might encounter a few problems:

Tips for Extending Spool Life

To get the most out of your trimmer spool and line:

• Use the Correct Line: Always use the manufacturer-recommended line gauge and type. Using line that is too thick can strain the trimmer's motor, while line that is too thin may break easily.
• Wind Neatly: When rewinding a spool, wind the line as neatly and evenly as possible. Overlapping or crisscrossing lines can lead to tangles and feeding problems.
• Store Trimmer Line Properly: Keep spare trimmer line in a dry place. Moisture can make the line brittle and harder to work with. Some people store their line in a sealed bag with a bit of water to keep it pliable, but excessive moisture is detrimental.
• Avoid Hard Surfaces: While bumping the head is necessary for feeding line, repeatedly hitting concrete, bricks, or rocks will wear down the line and the spool head much faster. Try to cut grass and weeds primarily, and use the bump feed sparingly when needed.
• Clean the Head: After use, especially in damp conditions, clean any grass clippings or debris from around the trimmer head. This helps prevent blockages and ensures smooth operation.

Frequently Asked Questions (FAQs)

Q1: How often should I replace my trimmer spool?
There's no fixed schedule; it depends on how often you use your trimmer and the conditions you're cutting in. You'll know it's time when the line runs out or you experience feeding issues.

Q2: Can I use any brand of trimmer line?
It's best to use line recommended by your trimmer's manufacturer. While universal lines exist, they might not be the optimal size or material for your specific trimmer, potentially causing performance issues.

Q3: My new spool isn't feeding line properly. What should I do?
Check that the line is wound evenly and isn't tangled. Ensure the ends are correctly threaded through the eyelets and that the spool cover is securely fastened. If the problem persists, the replacement spool might be faulty or incompatible.

Q4: Is it better to buy pre-wound spools or rewind my own?
Pre-wound spools are convenient and ensure the line is wound correctly, which can save time and prevent feeding issues. Rewinding your own can be more economical if you buy line in bulk, but it requires more care to ensure the line is wound neatly.

By following these steps and tips, you can confidently replace your grass trimmer spool and maintain your equipment for efficient garden care. A well-maintained trimmer not only makes your job easier but also contributes to a beautifully kept outdoor space.