how to put bag on Greenworks lawn mower

 

Putting the bag on a mower should be easy, right? When I first learned how to put the bag on my Greenworks lawn mower, I thought it would take just a minute. Instead, I wrestled with it longer than I expected! After a few tries, I figured out the trick to a smooth Greenworks mower bagging setup.

In this guide, I’ll show you how to attach the grass catcher to a Greenworks mower, plus tips for Greenworks 20-inch mower bag installation and Greenworks 40V mower bag installation guide. Let’s make it simple — so you can get back to mowing without any fuss!

Step-by-Step: How to Put Bag on Greenworks Lawn Mower

1. Turn Off and Prepare the Mower

First things first — safety always comes before mowing! Before you even think about setting up the bag, turn off your Greenworks mower and remove the battery. (Trust me, it’s way too easy to bump the button and start it by accident.)
I always double-check the battery indicator to make sure the mower is completely off. A few seconds here saves a lot of stress later.

Quick tip: Always power down and pull the battery out before any setup or maintenance!

2. Locate the Rear Discharge Opening

Next, find the rear discharge opening — that’s where the grass bag connects.
On most Greenworks models, it’s right at the back, tucked under a little spring-loaded flap. It might look like a small door or cover. When I first started, I didn’t even notice it because it blends in with the body!

Quick answer: Look at the back of the mower under the flap — that’s your spot for bagging.

3. Open the Rear Door

Now, lift the rear flap. It’s spring-loaded, so you might need to hold it up with one hand while you work with the other.
It feels a little awkward at first, but don’t worry — the spring isn’t too tight. Think of it like holding open a mailbox lid.

Quick tip: Hold the flap open firmly, but don’t force it. It’s made to flex!

4. Attach the Grass Catcher

Here’s the part most folks (me included) stumble on when learning how to attach the grass catcher to a Greenworks mower.
While holding the rear door up, grab your bag and line up the hooks (or rods) on the bag with the slots on the mower.
Once you line them up, slide or snap the bag into place. You’ll feel it “click” or fit snugly when it’s right. No heavy pushing needed!

Short answer: Hold up the flap, line up the hooks, and snap the bag into the slots.

5. Double-Check Bag Placement

Before you start mowing, take a second to check the bag. I learned the hard way — a bag that’s even slightly loose will let grass blow all over your legs. (Not fun, especially in shorts!)
Make sure the bag sits flat against the back of the mower, and that both sides are hooked in evenly.

Quick tip: If the bag wiggles or looks crooked, reset it — it should sit tight with no gaps.

Greenworks 20-Inch Mower Bag Installation

If you’re using a Greenworks 20-inch mower, you’re in good company — that’s the model I started with too! It’s a fantastic size for most yards: big enough to get the job done, but small enough to be easy to handle. Now, when it comes to the Greenworks 20-inch mower bag installation, there are just a couple of small things to keep in mind.

Quick answer: Installing the bag on the 20-inch Greenworks mower is almost the same as other models — but be extra careful to line up the hooks because the smaller frame leaves less wiggle room.

When I first set mine up, I thought I had the bag attached perfectly… until I started mowing and realized grass clippings were shooting out the sides like confetti at a birthday party! Turns out, on the 20-inch model, you really need to make sure those bag hooks snap firmly into place on both sides. It’s a little snugger than on some of the bigger mowers, so take an extra second to double-check.

The good news? Once you hear or feel that “click,” you’re golden. It’s like buckling a seatbelt — you just know when it’s locked in right.

Pro tip: If the bag feels loose at all on your 20-inch Greenworks, unhook it and reattach it from the center out, making sure both sides are even. A tight, flat fit means no more flying clippings!

Also, because the 20-inch frame is a touch smaller, the rear door (that little spring flap) might feel like it’s pushing against your hand while you’re working. Don’t stress! That’s totally normal. I found it easiest to prop the mower against my leg lightly while holding up the flap — kind of like leaning a backpack against your knee while zipping it.

Short guide for 20-inch installation:

• Power off and remove battery.
• Lift the rear flap carefully.
• Line up the bag’s rods/hooks precisely.
• Push until it clicks snugly into place.
• Double-check both sides for a tight, even fit.

Once you get the hang of the Greenworks 20-inch mower bag installation, it’s honestly a breeze. I can pop mine on in under 10 seconds now — no more surprise grass showers!

Greenworks 40V Mower Bag Installation Guide

If you have a Greenworks 40V mower, you made a great choice. It’s powerful but easy to use. Still, when I first tried to put the bag on, I thought it would be simple. It took a few tries before I got it right! Let me show you how to do it fast and easy.

Quick answer: To install the bag on a Greenworks 40V mower, first turn off the mower, remove the battery, lift the rear door, and hook the bag in place.

First step: Turn off the mower and remove the battery.
This is very important! The 40V mower has a lot of power. Even a small bump can start the blades. It’s like reaching into a blender that’s still plugged in — not safe! Always pull the battery out first and set it aside.

Tip: Never skip battery removal when working on your mower.

Next: Find the rear discharge flap.
It’s at the back of the mower. It looks like a small door. On 40V models, the flap can feel a little stiff. That’s normal. Just lift it up gently. Hold it up with one hand so you can attach the bag with the other.

Quick tip: If the flap feels tight, that’s okay — it’s built tough.

Now: Attach the bag.
Grab the grass catcher. Line up the hooks or rods with the slots on the mower. When they match, push gently until you feel a little “click.” The bag should fit snugly without forcing it.

Fast answer: Lift the flap, line up the bag hooks, and snap them into place.

Check the bag before you start mowing.
The bag should sit flat against the back of the mower. No wobbles, no gaps. If it looks loose, unhook it and try again.
I learned the hard way that a loose bag means grass flying everywhere! Trust me, you don’t want to chase clippings across your yard.

Pro tip: A snug bag means a clean yard and no flying grass.

How to Remove and Reattach Bag on Greenworks Mower

Taking the bag off your Greenworks mower is super easy once you know the trick. Honestly, the first time I tried, I pulled and tugged like I was wrestling a bear! But once I figured it out, it took just seconds.

Quick answer: To remove the bag, turn off the mower, lift the rear door, and unhook the bag carefully. Reattaching it is the same as putting it on the first time.

Step 1: Turn off the mower.
Always start by shutting everything down. If you’re using a Greenworks 40V model, make sure you remove the battery too. Safety first — it only takes a second, and it gives you peace of mind.

Fast tip: Always power down and remove the battery before touching the bag.

Step 2: Lift the rear door.
Find that little spring-loaded flap at the back of the mower. Just lift it up with one hand like you did when installing the bag. It feels a bit like opening a mailbox lid — light and easy.

Snippet tip: Hold up the flap to get clear access to the bag hooks.

Step 3: Unhook the bag carefully.
Reach in and grab the rods or hooks that hold the bag in place. Give them a gentle wiggle side to side. They should pop out pretty easily. No need for any hard pulling — if it feels stuck, you might just need to lift the flap a little higher.

Quick answer: Wiggle the bag hooks out gently while holding up the flap.

Reattaching the bag is the same.
To put the bag back on, just follow the same steps you used the first time: lift the flap, line up the hooks, and snap it into place. Once you hear or feel that soft click, you’re good to go!

Pro tip: Always double-check that the bag is snug before you start mowing again.

Common mistake I made early on:
When I first tried removing the bag, I forgot to lift the flap high enough. I ended up yanking on the bag like it was stuck in super glue. (Not my best moment!)
The simple fix? Always make sure the rear door is wide open. It makes the bag slide out super smooth — no wrestling required.

Fast fix: Open the flap fully before trying to remove the bag — it saves time and avoids damage.

Common Problems and Quick Fixes

Even after you know how to put the bag on a Greenworks lawn mower, little things can still trip you up. (Been there, done that!) Here are the most common bagging problems I ran into — and the easy fixes that made a world of difference.

Bag not staying on?

When I first started, my grass bag kept slipping off like a loose backpack. Super annoying — especially when I was halfway across the yard!

Quick answer: If your Greenworks mower bag won’t stay on, double-check that the hooks are fully snapped into place and the bag sits flat against the mower.

What helped me was really listening for that tiny “click” when attaching the bag. No click? It’s not locked. Also, if your mower frame has any dirt or grass stuck where the bag hooks go, clean it out first — even a little buildup can keep the bag from latching right.

Pro tip: After snapping the bag on, give it a gentle tug to make sure it’s secure before you start mowing.

Clippings blowing out ?

Picture this: You’re mowing, feeling good… and suddenly you’re covered in flying grass like it’s a weird summer snowstorm. Yep, happened to me too!

Quick answer: If clippings are blowing out, the bag probably isn’t sealed tightly or the rear door flap isn’t fully closed over the bag.

I learned that even a tiny gap can let clippings escape. Make sure the rear flap sits down snugly over the top of the bag once it’s attached. If the flap sticks up, it means the bag isn’t aligned correctly — just unhook it and try again.

Fast fix: Always double-check the flap is resting on the bag smoothly before you mow. No air gaps = no flying grass!

Bag too heavy?

The first time I filled the bag completely, I tried to lift it and almost pulled a muscle. (Why do clippings feel 10x heavier when you’re tired??)

Quick answer: If the bag gets too heavy, empty it more often instead of waiting until it’s completely full.

Here’s the thing: wet grass especially gets super heavy fast. I now empty my bag when it’s about halfway full if the grass is damp. It makes a huge difference — easier to handle, easier to reattach, and way less strain on your back.

Smart tip: If you’re mowing after rain or watering, plan to empty the bag sooner. Your arms (and your mower!) will thank you.

My easy mindset shift

Honestly, once I stopped treating the bag like it should hold everything in one go, mowing got a lot less frustrating. Think of it like taking out the trash before it overflows — small, regular empties keep things simple and smooth.

FAQs

How do you install a grass catcher on a Greenworks mower?

Honestly, once you know the trick, installing a grass catcher on a Greenworks mower is a breeze!
Quick answer: Lift the rear flap, line up the bag hooks with the slots, and snap it into place.

The first time I tried, I felt like I needed three hands — one to hold the flap, one for the bag, and one to wipe the sweat off my forehead! But really, it’s simple: hold the flap open, align the hooks carefully, and give it a little push. You’ll feel that satisfying “click,” and boom — you’re ready to mow.

Can I use my Greenworks mower without the bag?

Yes, absolutely! In fact, sometimes I skip the bag altogether if I’m in a rush or want to mulch instead.
Quick answer: You can mow without the bag — just let the clippings discharge or use the mulch plug if your mower has one.

When I’m short on time, I just pull the bag off and mow freely. The mower will either side-discharge or mulch the clippings, depending on how you set it up. It’s faster, but you’ll need to tidy up afterward if you want that perfect, clean-cut look.

Why won’t my Greenworks mower bag stay attached?

Oh man, I wrestled with this one for longer than I’d like to admit!
Quick answer: If your bag won’t stay on, check that the hooks are fully snapped in and that no debris is blocking the slots.

One time, I thought my mower was broken — turns out, a tiny piece of twig was stuck where the bag hooks in. After I cleared it, the bag popped on perfectly. Lesson learned: a quick look and a little cleaning can save a lot of frustration!

Is bagging better than mulching with a Greenworks mower?

It really depends on what you want for your lawn — I’ve tried both and loved them for different reasons.
Quick answer: Bagging is better for a clean, tidy yard; mulching is better for feeding your lawn naturally.

If I want that fresh, magazine-cover look, I always bag the clippings. But when my lawn needs a little TLC, I mulch instead — those tiny clippings break down and feed the grass. It’s like giving your lawn a free snack!

Do all Greenworks mowers come with a bag?

Almost all the ones I’ve seen do, but there are a few exceptions based on the model.
Quick answer: Most Greenworks mowers come with a grass bag, but it’s always smart to double-check the product listing or manual.

When I bought mine, the bag was included in the box — no extra shopping needed. But a friend of mine bought a bare-bones model (trying to save a few bucks) and had to order the bag separately later. It’s worth checking before you hit “buy!”

Final Thoughts: My Tips for a Smooth Bagging Setup

Learning how to put the bag on a Greenworks lawn mower felt tricky at first — but honestly, once I got the steps down, it became second nature. Now I barely even think about it!

My biggest advice: Practice attaching and removing the bag a couple of times before you actually start mowing. It’s way less stressful when you’re not racing against growing grass or a setting sun.

Also, keep everything clean! A little dirt or buildup around the hooks or flap can make bagging harder than it needs to be.

And don’t worry if it feels awkward at first — that was totally me, too. But after a few tries, you’ll be popping that bag on and off like a pro.

You’ve got this — happy mowing!

Read More: How to Maintain Your Lawn Mower: A Step-by-Step Guide