Greenworks Trimmer Auto Feed Not Working? My Fix

Is your Greenworks trimmer not feeding line? You’re not alone. I’ve had times when the line just won’t come out, no matter how many times I stop and start again.

Most of the time, the fix is simple. Try rewinding the spool. Or replace the line with the right size.

I’ve used electric trimmers for years on my small U.S. lawn. Over time, I’ve picked up a few easy tips.

Let me show you what works, what doesn’t, and how to get back to neat edges—without the stress.

Understanding the Auto Feed System in Greenworks Trimmers

When the auto feed works right, it saves time. You don’t have to stop and pull out more line. It should let out short bits of line as the old one wears down—on its own. No bumping. No winding. No fuss.

Most Greenworks trimmers use this setup. That includes both corded and cordless types. I’ve tried both in my yard. The cordless one is great for small lawns like mine. You don’t have to drag a cord through the flowers.

This feature is a big help—when it works. It keeps the job smooth and fast. But when it fails, trimming turns into a slow, stop-and-go mess.

Knowing how it should work helps. It lets you spot what’s wrong and fix it fast.

Let’s look at how it works, and how to fix it before it ruins your weekend.

Common Reasons the Greenworks Auto Feed Isn’t Working

If your Greenworks trimmer stops feeding line, don’t worry. This has happened to me more than once—usually halfway through a trim when I just want to finish. Most times, the tool isn’t broken. It just needs a quick check.

Spool Issues

• Line Wound the Wrong Way: If the line isn’t wrapped neat or goes the wrong way, it can jam. Even small tangles cause trouble. Always follow the arrow on the spool. If you guess, you’ll likely get it wrong—I did.
• Cheap or Off-Brand Line: Some third-party lines don’t sit well in the spool. I bought a cheap one once, and it kept getting stuck. Since then, I stick with Greenworks line or one with good reviews. They cost more, but they work.
• Line Jammed Inside: If the line melts or is wound too tight, it can fuse inside. I’ve opened the head and found the line stuck in place—this happens more on hot days. If it’s jammed, it won’t feed no matter how many times you restart.

Line Problems

• Wrong Line Size: Greenworks trimmers need a certain size line—often 0.065″ or 0.080″. I tried a thicker one once. It didn’t fit. Always check your manual.
• Old or Brittle Line: Line gets weak over time. If it’s been in your shed for a while, it might snap or stick. I replace mine each spring. Fresh line feeds better and breaks less.
• Line Fused from Heat: On hot days, or when cutting thick weeds, the line can melt from heat and friction. If it won’t feed and smells burnt, this could be the cause.

Bump Head or Cap Problems

• Loose or Unlocked Cap: If the cap isn’t on tight, the line won’t move. I’ve rushed this step and paid for it. Give it a firm twist to lock it in.
• Spring or Feed Parts Worn Out: The spring inside can weaken or get dirty. If the feed feels loose or you don’t hear a click, that may be the issue. I cleaned mine with a soft brush and WD-40—worked like new.

Battery or Power Problems (Cordless Models)

• Low Battery Power: Cordless trimmers need full power. If the battery is low, the motor can lag, and the feed may not trigger. I charge mine the night before—lesson learned.
• Motor Runs Rough or Cuts Out: If the motor surges or sounds weird, it might confuse the feed system. This could mean dirt, heat, or wear. If it sounds off, take a closer look.

Step-by-Step Troubleshooting Guide

If your Greenworks trimmer isn’t feeding line, don’t worry. You can fix it yourself. No need to call support or toss the tool. Here’s what I do when mine acts up.

Check the Line and Spool

This is always my first step. Most feed issues start in the spool.

Here’s how I check it:

• Unplug the tool or take out the battery. Safety first.
• Twist off the spool cap. Press down and turn.
• Pull out the spool. Look at the line. Is it neat? Does it follow the arrow?
• Rewind if needed. Follow the arrow. Keep it snug, not tight.
• Check the ends. They should stick out a little. If they’re too short, they won’t catch.

My tip: I use 0.065″ Greenworks line on my cordless model. It’s thin but strong. I once tried thicker line—it didn’t fit. I also buy line from stores like Lowe’s or Ace. Cheap brands online? They melt fast in the heat.

Inspect the Trimmer Head

If the spool looks fine, check the head.

Look for:

• Grass or dirt stuck inside. I’ve found clumps under the cap after big trims.
• Melted or fused line. This happens on hot days with heavy weeds.
• Sticky spring. Press the bump feed (if your model has one). It should bounce. If it’s stuck, clean it with a brush. A little WD-40 helps.

One time, I thought the spring was broken—but it was just full of plant bits.

Test the Auto Feed Mechanism

Once it’s clean and rewound, test the feed.

Here’s what I do:

• Plug it in or put the battery back.
• Start the trimmer, then stop after 1–2 seconds.
• Listen for a soft click or hum. That’s the auto-feed.
• Check the line. It should move out a bit.
• Try again if needed.

If it makes strange sounds—or no sound at all—there might be a motor problem. If you’re using a cordless model and don’t hear anything, check the battery next.

Battery Tips (Cordless Models)

I’ve used both corded and cordless trimmers. The battery can change everything.

What I’ve learned:

• Charge it fully. Half-full batteries work poorly. I charge mine the night before yard work.
• Avoid low charge. When the battery is weak, the feed might not work.
• Store indoors in winter. Cold kills battery life. I keep mine inside during cold U.S. winters.
• Swap batteries. If you have two, try the other one. That’s how I found out one of mine was fading.

When to Replace Parts—and What to Buy

Sometimes, no matter how much you rewind or clean, the line still won’t feed. That’s when it might be time to swap out a part. I’ve been there—frustrated, sweaty, and tired of trying.

Here’s what I check before replacing anything:

• Loose spool cap: If it won’t stay on or wobbles during trimming, it’s likely worn out.
• Weak or stuck spring: If the feed feels slow or jammed, the spring might be done.
• Cracked or warped head: Heat, drops, or heavy use can damage the head. If the spool doesn’t sit flat, the head may need a new one.

Greenworks-Compatible Parts I Recommend

If you need parts, make sure they match your trimmer model. Here’s what I’ve used:

• Spool Cap Replacement: Fits many 24V and 40V models. I got mine from Amazon (insert link if using). Check your model number—it’s on the shaft near the handle.
• Pre-Wound Spools: Don’t want to wind line yourself? I use Greenworks-branded 0.065″ spools. They drop right in. Found them at Lowe’s and Ace here in the U.S.
• Trimmer Head Replacement: If the head is cracked or bent, replace the whole thing. I’ve used official Greenworks heads—they’re more expensive, but they fit and last. I tried a cheap third-party one once… it didn’t line up right.

Preventative Maintenance Tips

Want to avoid feed problems? Keep your trimmer clean and checked. I’ve made it a habit. It only takes minutes and saves hours of frustration.

Here’s my go-to routine:

• Replace line every 2–3 uses
  Old line snaps fast, especially in heat. I rewind mine every couple of weeks during peak season.
• Clean the head after each trim
  I brush out grass and dust with an old toothbrush. A quick clean keeps things smooth.
• Check the spring monthly
  Make sure it still moves well. I spray a little WD-40 every few weeks to keep it working right.

My Weekly Yard Routine (Small Suburban U.S. Lawn)

I live in a suburb with a small yard. Every Sunday after mowing, I trim. The night before, I charge the battery. Before trimming, I check the line and clean the head. Takes five minutes. My trimmer has run great all season.

My Experience with Greenworks Trimmer Line Feed Issues

Let me be honest—I’ve had my fair share of trouble with my trimmer. The worst was one hot July day. The line wouldn’t feed. I was sweaty, mad, and ready to give up.

• What Went Wrong: The line had melted inside the spool. Too much heat. Too much friction. And I’d used a cheap line from a random online shop.
• How I Fixed It: I opened the head, pulled out the melted mess, and rewound it with real Greenworks line I got from Ace Hardware. I cleaned out all the gunk, sprayed the spring with WD-40, and popped the spool back in. Done in 15 minutes—and it ran like new.

Lessons I’ve Learned

• Don’t use cheap line. It melts or jams.
• Clean your trimmer after heavy trims.
• Always follow the arrow when winding the spool.

Tools That Helped

• Stiff brush: Great for cleaning the head.
• WD-40: Helps springs and parts move smoothly.
• Pre-cut line: I now keep a few ready. Saves time during yard work.

When to Call Greenworks Support or Use the Warranty

Sometimes, no matter what you try, your trimmer still won’t work. That’s when I call Greenworks support.

Here’s what to expect:

They’re helpful—but you’ll need your model number and proof of purchase. I once called about a cracked cap. They asked for a quick photo, and since I was still under the 3-year warranty, they sent a new one for free.

What the warranty usually covers:

• Factory defects
• Feed system problems
• Battery issues (if still under warranty)

What it doesn’t cover:

• Normal wear and tear
• Drops or damage from rough use
• Off-brand parts that don’t fit

If you’re still stuck, don’t give up. Check Greenworks’ website—they have support videos too. And don’t wait too long! The warranty starts on the day you bought it.

Conclusion

A trimmer that won’t feed line is super frustrating—but most of the time, it’s a quick fix. I’ve been there. A little cleaning, a new spool, or fresh line usually does the trick.

Here’s a quick recap:

• Always check the spool and how the line is wound
• Keep the head clean after each use
• Use the right size and type of line
• Make sure your battery is charged and strong

Take care of your trimmer, and it’ll take care of your lawn.

Got your own fix or tip that worked? Or a question I didn’t cover? Drop it in the comments—I’d love to hear from other weekend yard warriors!

FAQs – Greenworks Trimmer Auto Feed Not Working