Replacing a strimmer spool is one of the most common maintenance jobs for any grass trimmer. Whether your line has run out, the spool has become damaged, or the line no longer feeds correctly, fitting a replacement spool can quickly restore your strimmer's performance.

The good news is that most spools can be replaced in just a few minutes with minimal tools.

In this guide we'll explain how to replace a strimmer spool safely and correctly.

Why Replace a Strimmer Spool?

A strimmer spool holds the cutting line used to trim grass and weeds.

Over time the spool may become worn, cracked, or damaged through normal use.

Common reasons for replacement

• The spool is cracked

• The line no longer feeds correctly

• The retaining clips have broken

• The spool has become distorted

• The original spool is missing

If your line is not feeding correctly, see Why Is My Strimmer Line Not Feeding? Causes and Fixes.

Before You Start

Safety should always come first.

For electric strimmers

• Disconnect from the mains power supply

• Remove any extension leads

For cordless strimmers

• Remove the battery

For petrol strimmers

• Switch off the engine

• Allow moving parts to stop completely

Never work on a strimmer while it is connected to a power source.

Step 1 – Remove the Existing Spool

Most domestic strimmers use a simple clip-on spool system.

Typical process

• Locate the spool cover

• Press the release tabs on either side

• Lift off the cover

• Remove the spool assembly

Some models may use a screw fixing instead.

Always consult the user manual if you're unsure.

Step 2 – Inspect the Spool Housing

Before fitting the new spool, inspect the housing carefully.

Check for

• Grass build-up

• Dirt and debris

• Damaged retaining clips

• Worn line eyelets

Cleaning the housing can improve line feeding and extend component life.

Step 3 – Check the Spring

Many bump-feed strimmers use a spring beneath the spool.

What to inspect

• The spring is present

• It is not damaged

• It moves freely

If the spring is missing or broken, line feeding may not work correctly.

Step 4 – Fit the Replacement Spool

Place the replacement spool into the housing.

Make sure

• The spool sits flat

• The line exits through the correct eyelets

• The spool rotates freely

If using a pre-wound spool, carefully feed the line through the guide holes before fitting.

Step 5 – Refit the Spool Cover

Once the spool is positioned correctly:

• Align the cover

• Press firmly until the clips engage

• Check that the cover is secure

The spool should rotate normally without excessive movement.

Step 6 – Test the Line Feed

Before using the strimmer fully, check that the line feed mechanism works correctly.

Test for

• Smooth spool movement

• Correct line length

• Proper bump-feed operation (where applicable)

If the line does not advance, recheck the spool installation.

Common Installation Mistakes

Many feeding problems occur because the spool has not been fitted correctly.

Avoid:

• Trapping the line under the spool

• Installing the spool upside down

• Using the wrong spool type

• Fitting incorrect line diameter

These mistakes can lead to poor feeding performance and line breakage.

Should You Replace the Whole Head?

Sometimes replacing the spool alone is not enough.

Consider replacing the complete strimmer head if:

• The housing is cracked

• The eyelets are heavily worn

• The bump-feed mechanism is damaged

• The cover no longer clips securely

A complete replacement can often improve reliability.

How This Relates to Other Strimmer Problems

Spool issues are often linked to other common faults.

For example:

• If the line will not advance, see Why Is My Strimmer Line Not Feeding? Causes and Fixes

• If the line snaps frequently, read Strimmer Line Keeps Breaking – Causes and Fixes

• If the head is not rotating, see Strimmer Head Not Spinning – Causes and Fixes

Choosing the Correct Replacement Spool

Not all spools are interchangeable.

Before ordering a replacement:

Check

• Brand

• Model number

• Line diameter

• Spool design

Using the correct replacement ensures proper fitment and performance.

You can find replacement strimmer spools, spool covers, complete heads, and replacement line for many popular brands from Yourspares.

Preventing Future Problems

A few simple maintenance habits can help extend spool life.

Helpful tips

• Clean the head after each use

• Replace worn line promptly

• Avoid striking hard surfaces

• Store spare line correctly

• Inspect the spool regularly

Final Thoughts

Replacing a strimmer spool is a simple maintenance task that can often restore cutting performance and solve line feeding issues.

By fitting the correct spool and keeping the head clean, you can help ensure reliable operation and reduce frustration while working in the garden.

Related Garden Equipment Advice

• Why Is My Strimmer Line Not Feeding? Causes and Fixes

• Strimmer Line Keeps Breaking – Causes and Fixes

• Strimmer Head Not Spinning – Causes and Fixes

• Electric Strimmer Won't Start – Causes and Fixes

• Petrol Strimmer Won't Start – Causes and Fixes

• Strimmer Vibrating Excessively – Causes and Fixes

• How to Wind Strimmer Line Correctly