Introduction
If you’ve ever owned a Redmax weed eater, you know it’s a reliable workhorse for keeping your lawn, garden edges, and overgrown areas tidy. Over time, though, even the best trimmers need maintenance, and one of the most common fixes is replacing the cutting head. Whether your current head is cracked, the line won’t feed properly, or you want to upgrade to a heavier-duty blade for brush, learning How to Change Head on Redmax Weed Eater? is a simple, cost-effective skill that will extend the life of your tool for years. Unlike cheaper disposable trimmers, Redmax models are designed for easy part replacement, so you won’t need to take your tool to a repair shop or buy a brand-new unit for a minor fix. This guide walks you through every step of the process, from gathering the right tools to troubleshooting common post-installation issues, so you can get back to trimming in no time.
- Why Change Your Redmax Weed Eater Head?
- Types of Redmax Weed Eater Heads
- Bump Feed Heads
- Fixed Line Heads
- Blade Attachment Heads
- Tools and Materials You’ll Need
- Safety Precautions Before You Start
- Step-by-Step Guide to Changing Your Redmax Weed Eater Head
- Installing Different Head Types
- Bump Feed Head Installation
- Fixed Line Head Installation
- Blade Attachment Installation
- Troubleshooting Common Issues After Head Replacement
- Tips for Extending Your Redmax Weed Eater Head’s Lifespan
- Common Mistakes to Avoid When Changing the Head
- Frequently Asked Questions
- Conclusion
Why Change Your Redmax Weed Eater Head?
There are dozens of reasons you might need to replace the head on your Redmax trimmer, most of which are related to normal wear and tear from regular use. The most common reason is a cracked or broken plastic head, which happens when the trimmer accidentally hits rocks, curbs, tree roots, or other hard obstacles while you’re working. Even small cracks can cause the head to wobble, leading to uneven cuts and extra strain on the trimmer’s motor. Another common issue is a malfunctioning line feed mechanism: bump feed heads can get clogged with grass clippings and debris, causing line to stop releasing automatically, while fixed line heads can wear out their line slots over time, making it impossible to secure line properly. Many users also choose to upgrade their head to a heavier-duty option, like switching from a standard bump feed head to a fixed line head for thicker weeds, or adding a blade attachment for brush clearing. Finally, replacing the head is almost always cheaper than buying a brand-new Redmax trimmer, which can cost $150 to $300 for a new residential model. Redmax sells OEM replacement heads directly, as well as a wide range of compatible aftermarket options, so you can find a perfect fit for your model without breaking the bank.
Types of Redmax Weed Eater Heads
Redmax offers three main types of replacement heads, each designed for different use cases and cutting needs. All three are compatible with most Redmax gas, corded electric, and battery-powered trimmers with a standard threaded spindle, but always confirm compatibility with your specific model before purchasing a new head.
Bump Feed Heads
Bump feed heads are the most common stock head on Redmax residential trimmers. They hold a spool of pre-wound cutting line inside the head, and you release more line by bumping the bottom of the head against the ground while the trimmer is running. They’re ideal for general lawn trimming, edging, and light weed control, as they automatically adjust line length as it wears down. Most bump feed heads for Redmax use 0.065” to 0.080” round cutting line, though some heavy-duty models support up to 0.095”.
Fixed Line Heads
Fixed line heads, also called “manual feed” heads, use pre-cut lengths of cutting line that you insert directly into slots on the head, rather than winding a spool inside. They’re more durable than bump feed heads because they have fewer moving parts, and they’re better for thick, tough weeds that can jam bump feed mechanisms. Fixed line heads are a popular upgrade for users who trim large areas or deal with dense vegetation regularly, and they typically use thicker line from 0.080” to 0.095” for more cutting power.
Blade Attachment Heads
For users who need to clear brush, woody stems, and overgrown brambles, Redmax offers blade attachment heads that replace the standard line head with a metal or composite cutting blade. These heavy-duty heads can handle vegetation up to 2 inches in diameter, depending on the blade size, and are compatible with most Redmax gas and battery-powered trimmers with a threaded spindle. They’re a popular upgrade for property owners with lots of overgrown areas or rural land.
| Head Type | Ideal Use Case | Typical Cutting Line Size | Ease of Replacement | Durability | Average Cost |
|---|---|---|---|---|---|
| Bump Feed | General residential lawn trimming, light weeds | 0.065″ – 0.080″ | Very Easy | Moderate (plastic components wear over time) | $15 – $35 |
| Fixed Line | Heavy residential use, thicker weeds, consistent cutting | 0.080″ – 0.095″ | Easy | High (fewer moving parts) | $12 – $30 |
| Blade Attachment | Brush clearing, woody vegetation, overgrown areas | 8″ – 10″ metal or composite blade | Moderate | Very High (can be sharpened) | $20 – $50 |
Tools and Materials You’ll Need
Before you start the replacement process, gather all the necessary tools and parts to avoid interruptions. You’ll need:
- A replacement Redmax weed eater head compatible with your model (check your owner’s manual for part numbers if you’re unsure)
- Replacement cutting line (if your new head doesn’t come pre-wound, match the line size to your head’s specifications)
- Socket wrench set (most Redmax models use a 10mm or 13mm socket for the spindle nut; check your manual to confirm)
- Flathead screwdriver (some models have a retaining screw on the head cap)
- Work gloves (to protect your hands from sharp line edges and metal parts)
- Safety glasses (to protect your eyes from debris and flying line)
- Penetrating oil (like WD-40, for stuck spindle nuts)
- Clean rag or brush (to clean debris off the spindle before installation)
If you don’t have a socket wrench set, you can purchase a basic set at any hardware store for less than $10, and it’s a useful tool for other small engine repairs as well.
Safety Precautions Before You Start
Taking a few minutes to follow safety guidelines will prevent accidental injury and damage to your trimmer. Follow these steps before you touch any parts:
- Disconnect the power source: For gas-powered Redmax trimmers, pull the spark plug wire off the plug to prevent accidental startup. For battery-powered models, remove the battery pack entirely. Never rely on the trigger lock alone, as a bumped trigger can start the trimmer unexpectedly.
- Let the trimmer cool down: If you’ve been using the trimmer recently, let the engine and head cool for at least 15 minutes before handling them to avoid burns from hot metal or plastic.
- Wear protective gear: Always wear work gloves and safety glasses, even during disassembly. Sharp cutting line edges and metal parts can cause cuts, and debris can fly loose when removing the old head.
- Work in a well-ventilated area: For gas-powered models, work outdoors or in a space with good airflow to avoid fume buildup. Never work near open flames or sparks when handling fuel-powered equipment.
- Work on a flat, stable surface: Lay the trimmer on a workbench or the ground in a well-lit area so it doesn’t tip over while you’re working.
- Keep children and pets away: Set up your workspace away from high-traffic areas to avoid distractions or accidental contact with the trimmer.
Step-by-Step Guide: How to Change Head on Redmax Weed Eater?
- Prepare the trimmer for disassembly: Lay your Redmax trimmer on a flat, stable surface with the head facing up. Disconnect the spark plug wire for gas-powered models, or remove the battery pack entirely for cordless models, to prevent accidental startup. If your model has a plastic head retention cap, use a flathead screwdriver to gently pry it off to expose the spindle nut underneath, taking care not to break the small holding clips. Some newer Redmax models feature a quick-release spindle nut that can be loosened by hand, so check your owner’s manual to see if your model uses this system to skip the socket wrench step.
- Remove the old cutting line (if present): Pull out as much of the old cutting line as possible to clear the area around the spindle. This prevents loose line from getting tangled in the spindle threads during removal.
- Loosen and remove the spindle nut: Fit the correct size socket (usually 10mm or 13mm for most Redmax models) onto the spindle nut, then turn it counterclockwise (lefty loosey) to loosen it. Most nuts only require 2-3 full turns to remove, but if the nut is stuck from rust or built-up grass debris, spray a small amount of penetrating oil around the base of the nut and let it sit for 5 minutes before trying again. Once loosened, remove the nut and set it aside in a safe place so it doesn’t get lost.
- Remove the old head: Grip the old head firmly and pull it straight up off the spindle. Do not twist or pry the head, as this can bend the spindle pins or strip the threads. If the head is stuck due to corrosion or built-up debris, gently wiggle it back and forth while pulling straight up to loosen it. You can also tap the bottom of the head lightly with a rubber mallet to break it free without damaging the plastic components.
- Clean the spindle: Use a clean rag or small brush to wipe away all grass clippings, dirt, old grease, and debris from the spindle threads and pins. This ensures the new head seats properly and doesn’t loosen over time. Inspect the spindle pins to make sure they are not bent or damaged – if they are, you’ll need to replace the spindle assembly before installing a new head.
- Prepare the new head for installation: If your new head comes with a spindle adapter (required for some aftermarket heads or different head types), slide the adapter onto the spindle first and hand-tighten it slightly to hold it in place. If you’re installing a bump feed or fixed line head, you can pre-wind or pre-cut the cutting line now to speed up the installation process.
- Install the new head: Align the mounting holes on the bottom of the new head with the spindle pins, then slide the head straight down onto the spindle until it sits flush against the adapter (or the spindle itself, if no adapter is used). Do not force the head on – if it doesn’t slide on easily, double-check that the pins are aligned correctly and that you’re using the right head for your model. Once the head is seated, place the spindle nut back onto the spindle and hand-tighten it clockwise (righty tighty) first to avoid cross-threading. Once the nut is hand-tight, use the socket wrench to snug it down firmly – do not overtighten, as this can crack the plastic head or strip the spindle threads. A good rule of thumb is to tighten the nut until it’s snug, then give it an extra 1/8 turn with the wrench.
- Test the installation: Reconnect the spark plug wire or battery, then start the trimmer on a low speed. Spin the head by hand to make sure it rotates freely without rubbing against the trimmer guard. For bump feed heads, test the line feed by bumping the bottom of the head on a hard surface – line should release automatically. For fixed line heads, check that the line is even on both sides. For blade attachments, test at low speed first to make sure the blade is balanced and not wobbling. If you notice any wobbling, unusual noise, or rubbing, turn off the trimmer immediately and recheck the installation.
Installing Different Head Types
While the basic installation process is the same for all Redmax head types, there are a few extra steps to ensure each head works correctly after installation.
Bump Feed Head Installation
Most aftermarket bump feed heads for Redmax come pre-wound with line, so you only need to install the head as outlined above. If you need to wind the line yourself, feed one end of the line into the entry hole on the side of the head, wind it evenly around the internal spool (do not overlap the line, as this can cause jams), then pull 2-3 inches of line out through the exit hole and snap the spool back into place. Test the bump mechanism by bumping the bottom of the head on a hard surface while the trimmer is running – line should release automatically with each bump.
Fixed Line Head Installation
Fixed line heads do not use a spool, so you’ll need to cut lengths of cutting line to match your head’s specifications (usually 6-8 inches long for most Redmax fixed line heads). Insert one end of the line into one of the slots on the head, pull it through until an equal length is sticking out of both sides, then repeat for the second slot if your head uses two lines. Trim any excess line with scissors so it’s even on both sides. Unlike bump feed heads, fixed line heads do not have a feeding mechanism, so you’ll need to replace the line manually when it wears down.
Blade Attachment Installation
Installing a blade attachment follows the same basic steps as a standard line head, with a few extra safety checks. First, confirm the blade is sharp and free of nicks or damage before installation – a dull blade will put extra strain on your trimmer’s motor. Align the center hole of the blade with the spindle pins, slide it onto the spindle, then secure it with the spindle nut, tightening it firmly with the socket wrench. Never use a cracked or severely worn blade, as it can break off during use and cause serious injury. After installation, test the blade at low speed first to make sure it’s balanced and not wobbling.
Troubleshooting Common Issues After Head Replacement
Even if you follow the steps correctly, you may run into small issues after installing a new head. Here are the most common problems and how to fix them:
- Head wobbles or vibrates excessively: This is almost always caused by the head not being seated properly on the spindle, or the spindle nut not being tightened enough. Turn off the trimmer, disconnect the power source, remove the head, and reinstall it, making sure it sits flush against the spindle and the nut is snug. If the wobble persists, check that the spindle pins are not bent.
- Line won’t feed (bump feed heads): First, check that you’ve loaded the line correctly and that there are no jams in the feed mechanism. If the line is loaded properly, the bump mechanism may be stuck – spray a small amount of penetrating oil into the bottom of the head and work the bump mechanism up and down a few times to loosen it. If the line still won’t feed, the head may be defective, so contact the manufacturer for a replacement.
- Trimmer stalls or has reduced power: This is usually caused by using a head that is too heavy for your trimmer’s motor, or a blade that is dull or too large for the model. Check your owner’s manual for the maximum head weight and blade size your Redmax trimmer supports, and switch to a lighter head or sharpen the blade if needed.
- Line breaks frequently: This is often caused by using line that is too thick for your head, or line that is old and brittle. Always use the line size recommended for your head, and store spare line in a cool, dry place to prevent it from becoming brittle over time.
Tips for Extending Your Redmax Weed Eater Head’s Lifespan
With proper care, your new Redmax weed eater head can last for years, even with regular use. Follow these tips to get the most out of your investment:
- Clean the head after each use: Wipe away grass clippings, dirt, and debris from the head and spindle after every trimming session. Built-up debris can cause the bump mechanism to jam, corrode metal parts, and put extra strain on the motor.
- Use the correct cutting line size: Never use line that is thicker than the maximum recommended size for your head. Oversized line will jam the feed mechanism, overwork the motor, and cause the head to wear out faster.
- Avoid cutting rocks, metal, or hard surfaces: Hitting rocks, curbs, or pavement with your trimmer head will crack plastic components, dull blades, and damage the spindle. If you’re trimming near hard surfaces, adjust the trimmer’s guard to protect the head, or use a blade guard for added protection.
- Store the trimmer in a dry place: Moisture can cause metal parts to rust and plastic components to become brittle over time. Store your trimmer in a garage or shed away from direct sunlight and rain when not in use.
- Sharpen blade attachments regularly: If you use a blade head, sharpen it every 10-15 hours of use with a file or grinder to keep it cutting efficiently. A dull blade puts extra strain on the motor and will wear out faster.
Common Mistakes to Avoid When Changing the Head
Even experienced DIYers make mistakes when changing a weed eater head, but avoiding these common errors will make the process smoother and prevent damage to your trimmer:
- Forgetting to disconnect the power source: This is the most dangerous mistake, as it can lead to accidental startup and serious injury. Always disconnect the spark plug or remove the battery before starting any work on the trimmer.
- Using a universal head that isn’t compatible: Not all replacement heads fit Redmax trimmers, even if they claim to be “universal.” Always check the part number and compatibility list for your specific Redmax model before buying a new head to avoid fit issues.
- Twisting the old head when removing it: Twisting the head can bend the spindle pins or strip the threads, making it impossible to install a new head properly. Always pull the head straight up off the spindle, wiggling gently if it’s stuck.
- Overtightening the spindle nut: As mentioned earlier, overtightening can crack the plastic head or strip the spindle threads, leading to costly repairs. Tighten the nut until it’s snug, then stop – you don’t need to use a lot of force.
- Skipping the spindle cleaning step: Failing to clean debris off the spindle before installing the new head can cause the head to loosen over time, or allow dirt to get into the threads and cause corrosion. Always wipe the spindle clean before installation.
- Using the wrong cutting line size: Using line that is too thick will jam the feed mechanism, overwork the motor, and cause the head to wear out faster. Always check your head’s specifications for the maximum line size allowed.
Frequently Asked Questions
How often do I need to change my Redmax weed eater head?
With regular maintenance and proper use, a standard Redmax bump feed or fixed line head will last 1-3 years for residential use. Blade attachments can last 5+ years with regular sharpening. You’ll know it’s time to replace the head when you notice cracks in the plastic, line that won’t feed, excessive vibration, or the head no longer tightens properly to the spindle.
Can I use a universal replacement head on my Redmax trimmer?
Some universal heads are compatible with Redmax trimmers, but you’ll need to confirm that the head’s mounting pattern matches your model’s spindle. Most Redmax trimmers use a standard 4-pin spindle, but some older or commercial models have a unique mounting system. Always check your owner’s manual or the head’s compatibility list before purchasing a universal part to avoid fit issues.
What size spindle nut does my Redmax weed eater use?
Most residential Redmax trimmers use a 10mm spindle nut, while larger commercial models use a 13mm nut. The easiest way to confirm is to check your owner’s manual, or remove the head cap and measure the nut directly with a socket wrench. If you’ve lost your manual, you can also look up the part number for your specific model on the Redmax website to find the correct nut size.
Why does my new head keep coming loose after installation?
This is usually caused by one of three issues: the spindle nut is not tightened enough, the spindle threads are stripped, or debris is trapped between the head and the spindle. First, remove the head, clean the spindle thoroughly, then reinstall the head and tighten the nut firmly (but not overtightened). If the head still comes loose, inspect the spindle threads for damage – if they are stripped, you may need to replace the spindle assembly, which is a more involved repair.
Can I upgrade my bump feed head to a blade attachment?
Yes, most Redmax trimmers with a threaded spindle are compatible with blade attachment heads, as long as the blade size is within the motor’s power limits. Check your owner’s manual for the maximum blade size your model supports – most residential Redmax trimmers can handle 8” blades, while commercial models support up to 10”. You may need to purchase a blade guard separately for added safety when using a blade attachment.
Conclusion
Learning How to Change Head on Redmax Weed Eater? is a simple, valuable skill that will save you money and extend the life of your trimmer for years. Whether you’re replacing a worn-out head, upgrading to a blade for brush clearing, or fixing a jammed line feed, the process only takes 10-15 minutes with the right tools and a few basic precautions. By following the step-by-step guide outlined above, choosing the right head type for your needs, and avoiding common mistakes like overtightening the spindle nut or using the wrong line size, you can complete the replacement quickly and get back to maintaining your property. Redmax trimmers are built to last, and with proper maintenance like regular head replacements, they can stay in top condition for a decade or more. If you run into any issues during the process, refer to your owner’s manual or contact Redmax customer support for model-specific guidance.