How to Take the Head Off of a Weed Eater
To remove the head from a weed eater (string trimmer), first disconnect the spark plug on gas models for safety. The removal method depends on your trimmer’s head type: (1) For most screw-on heads, hold the shaft near the head and rotate the entire head counterclockwise (or clockwise on some models) by hand or with a wrench until it unscrews completely; (2) For heads with a center bolt, insert a hex wrench or locking pin through the hole in the housing to lock the shaft, then loosen the bolt with a wrench; (3) For tab-lock heads, press the locking tab and turn the head until it separates from the shaft. Always consult your owner’s manual for model-specific instructions.
Understanding Weed Eater Head Removal
The phrase “taking the head off” for a string trimmer almost always refers to removing the cutting head—the part at the end of the shaft that holds the trimmer line. This is a common maintenance task for several reasons: you may need to replace worn-out trimmer line, clean out tangled debris, or swap the entire head for a different type (like moving from a bump-feed head to a fixed-line head).
It’s important to distinguish this from servicing the engine cylinder head, which is a mechanical repair involving the engine’s internal components. This guide focuses solely on the cutting head removal process.
Safety First: Critical Preparation Step
Before performing any work on your weed eater, especially on gas-powered models, you must disconnect the spark plug. This is the most important safety step. Even if you’re only working on the head, the engine could accidentally start if the throttle is bumped, posing a serious risk of injury from the spinning head or other moving parts.
To disconnect the spark plug:
- Locate the spark plug wire and boot (the rubber connector) on the engine.
- Pull the boot straight off the spark plug terminal.
- Tuck the wire away from the plug to prevent accidental contact.
For electric trimmers (corded or battery-powered), ensure the unit is unplugged or the battery is removed before proceeding.
Identifying Your Trimmer Head Type
Before you can remove the head, you need to identify which of the three common attachment mechanisms your trimmer uses. Look closely at the point where the head connects to the shaft.
1. Screw-On Head (Most Common)
This is the standard on many consumer-grade trimmers. The entire head assembly threads directly onto the end of the drive shaft. Visually, you’ll see a large, round head that appears to be screwed onto a threaded shaft. There are no obvious bolts or tabs on the exterior.
2. Center-Bolt Head
Some trimmers, particularly more heavy-duty or commercial models, secure the head with a central bolt or screw. You’ll typically see a hex-head bolt or a large Phillips-head screw in the very center of the head. There may also be a small hole in the metal housing just above the head, which is used to lock the shaft.
3. Tab-Lock Head
This mechanism uses a spring-loaded locking tab. You’ll see a small plastic or metal button/tab on the side of the gear housing (the metal part between the shaft and the head). The head itself may not have visible threads.
Step-by-Step Removal for Screw-On Heads
This is the most common method. You’ll typically need no tools, though a strap wrench can help if the head is stuck.
- Secure the Shaft: Hold the trimmer shaft firmly with one hand just above the head. This prevents the entire shaft from spinning.
- Rotate the Head: With your other hand, grip the trimmer head firmly and rotate it counterclockwise (lefty-loosey). Note: Some models, particularly older ones or certain brands, may use reverse threads, requiring a clockwise turn. If it doesn’t budge counterclockwise, try clockwise.
- Unscrew Completely: Continue turning until the head detaches from the threaded shaft. You may feel the threads disengage.
- Inspect: Once removed, you can clean the threads on the shaft and the inside of the head before reinstalling or replacing it.
Pro Tip: If the head is stuck, you can use a strap wrench or wrap the head with a rubber glove for better grip. Avoid using pliers directly on the plastic head, as this can crack or damage it.
Step-by-Step Removal for Center-Bolt Heads
This method requires a tool to lock the shaft and another to loosen the bolt.
- Lock the Shaft: Locate the small hole in the gear housing. Insert a hex wrench (Allen key) or the locking pin that came with your trimmer through this hole. This will engage with a notch on the shaft, preventing it from spinning.
- Loosen the Bolt: While holding the locking pin in place, use a wrench or socket to turn the center bolt counterclockwise to loosen it.
- Remove the Head: Once the bolt is loose, you can usually unscrew it the rest of the way by hand. The head should then slide off the shaft.
Important: Keep track of any washers or spacers that may be behind the bolt. Note their order and orientation for reassembly.
Step-by-Step Removal for Tab-Lock Heads
This is a quick-release system common on many modern trimmers.
- Locate the Tab: Find the locking tab on the side of the gear housing.
- Press and Turn: Press and hold the tab in with your thumb or finger. While keeping it depressed, rotate the head (usually counterclockwise) until you feel it unlock.
- Separate the Head: Once unlocked, the head should pull straight off or continue to unscrew from the shaft.
Reinstallation is the reverse: align the head with the shaft, press the tab, and turn until it clicks into place.
Troubleshooting a Stuck Trimmer Head
If the head won’t budge, don’t force it excessively, as you could damage the threads or the gear housing.
- Clean the Area: Debris, dirt, and dried grass can pack into the threads. Use a wire brush or compressed air to clean the connection point.
- Apply Penetrating Oil: A product like PB Blaster or WD-40 Specialist Penetrant can help loosen corroded or stuck threads. Apply it to the seam and let it sit for 10-15 minutes before trying again.
- Use Proper Leverage: For screw-on heads, a strap wrench provides excellent grip without damaging the plastic. For center-bolt heads, ensure you are using the correct size wrench and that the shaft is properly locked.
- Consult the Manual: If you’re unsure about the mechanism or if it remains stuck, stop and refer to your owner’s manual. Forcing it could lead to costly repairs.
Frequently Asked Questions
Which way do you turn a weed eater head to remove it?
For most modern screw-on trimmer heads, you turn the head counterclockwise (lefty-loosey) to remove it. However, some older models or specific brands may use reverse threads, requiring a clockwise turn. Always check your owner’s manual if you’re unsure.
Do I need any tools to remove my trimmer head?
It depends on the head type. Screw-on heads and tab-lock heads can usually be removed by hand. Center-bolt heads require a wrench to loosen the bolt and a hex key or locking pin to hold the shaft stationary.
Why is my trimmer head stuck and how do I fix it?
A stuck head is often caused by dirt, debris, or corrosion in the threads. First, clean the area thoroughly. If it’s still stuck, apply a penetrating oil, let it soak, and then use a strap wrench for better leverage. Avoid using excessive force that could break the plastic components.
Can I replace my bump-feed head with a different type of head?
Yes, in many cases you can. As long as the new head is compatible with your trimmer’s shaft size and attachment mechanism (screw-on, bolt, etc.), you can swap it. Always verify compatibility with the trimmer manufacturer or the head manufacturer before purchasing.
