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Greenworks 40V (2-In-1) Dethatcher / Scarifier, Tool Only


(9 customer reviews)
Last updated on November 24, 2023 1:00 am Details
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  • Keep your yard healthy by dethatching in early spring or early fall for cool-season grasses, and in late spring through early summer (after the 2nd mowing) for warm-season grasses
  • Quick-swap tine reels to easily switch between the included dethatcher and scarifier attachments
  • 14-inch dethatching path allows you to complete jobs faster and more efficiently
  • 5-position depth adjustment from -1/2-in. to +1/5-in. (scarifying) and -1/10-in to +3/4-in. (dethatching)
  • Stainless steel tines stay sharp longer for reliable performance

Specification: Greenworks 40V (2-In-1) Dethatcher / Scarifier, Tool Only

Product Dimensions

34.6 x 43.1 x 23.4 inches

Item Weight

25.7 pounds


Sunrise Global Marketing, LLC

Country of Origin


Item model number


Photos: Greenworks 40V (2-In-1) Dethatcher / Scarifier, Tool Only

9 reviews for Greenworks 40V (2-In-1) Dethatcher / Scarifier, Tool Only

4.6 out of 5
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  1. JS in Seattle

    A decent product from a horrible company.

    With one major exception, this is a great little machine. It arrived yesterday afternoon, and I assembled it this morning. It only took a few minutes to assemble although the instructions are incomplete in one instance and completely wrong in another (more on this later). Luckily I had read other reviews that pointed out the problems so I was aware of them and worked around them before they became issues. The company is aware of the problem and has made no attempt to correct it.

    I used the machine for the first time today and was able to dethatch a 3500 square foot yard in about an hour. I was moving at a leisurely pace and probably could have done it in less time if I had wanted to. Raking up the thatch that was kicked up took another hour or so and was actually a lot more work than using the dethatcher. I tried to use my lawnmower to bag the thatch but it was too dry and light so half went into the mower bag and half just blew out from under the mower. The bag was also filling up after less than 2 passes so I decided to just grab a rake and some large lawn bags. I raked the thatch into 15 piles and then bagged each pile. My dog “helped” by tearing apart each little thatch pile until she got tired and then went to sleep in one.

    Others have reported that the machine overheats, but I had no problem. I used a 100’ foot, heavy duty extension cord. I stopped the machine briefly after each length of my yard (about 70’) to flip the cord to the other side so maybe that helped keep it cool. I suspect the extension cord used and the amount of time the machine runs continuously are two factors that cause overheating. Another reviewer reported that the extension cord kept coming unplugged from the machine. I used the cord clip that comes in the box and the cords remained securely connected the entire time I used the machine.

    My lawn is a weird mix of PGA-quality grass and total crap. I quickly learned to adjust my walking speed as I went over the lawn so that I wasn’t tearing up the good stuff but was clearing the “thatchy” stuff. The machine is also light enough that I could pick it up and move it around the yard as needed. It did bog down occasionally when I was going through heavy thatch. On a couple of occasions I released the handle to stop the machine, picked it up, and gave it a shake to clear the the thatch that had built up underneath the housing. I only had to do that a couple of times and given this was the first time my yard had been detached in years, I was impressed it did as well as it did.

    Compared to the cost and hassle of renting and transporting a gas-powered dethacher, this thing will be a steal if I get 5 or 6 uses out of it. I suspect it’ll last a while and I’m glad I bought it given the price.

    There is one thing about this machine (company?) that really pisses me off. The instructions are wrong and the company has been knowingly sending out incorrect instructions for OVER 3.5 YEARS!!! The manual has the height settings reversed. It also instructs you to assemble things without ever mentioning you need TO FIRST install the cord lock on the lower handle. If you use the recommended height settings you risk bending the tines or trashing your lawn. If you follow the assembly instructions as written, you’ll need to disassemble things and start over. The manual has a revision date of January of 2015, meaning Greenworks has had 3.5 years to make things right. But they haven’t. They reply to lots of customer reviews on Amazon but ignore comments that call out the issue with the documentation. A simple sticker on the machine or on the front of the manual would fix this but Greenworks doesn’t seem to give a damn. Poor form on their part and I would never buy a product from them that costs a substantial amount of money given the way they’ve handled the documentation problem.

    I’m happy with the product but any company that ships incorrect instructions for more than three years doesn’t get any more of my money. Get it together, Greenworks.

    As always, your mileage may vary.

    Photos show the job halfway complete, completed, and my helper relaxing in a pile of thatch.

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  2. Michael C. Bomgren

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     This thing is a BEAST! The start button and safety bar are cheap and I’m not sure how long they will last but I’ll just bypass it when/if that happens. This tore up and incredible amount of moss and buttercup vine and dead grass. I used the highest setting. Will do another pass in the other direction a setting lower in the spring. AMAZING! You will definitely need a good rake after. I filled a pickup truck from an average sized yard.

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  3. Clayton Lee

    I have only used it on it’s highest setting and it’s already cleaning all the dead grass. Like seen on many reviews, you may have to make one more pass than with a heavy gas dethatcher but that’s not an issue especially if you take into account that’s it’s light! If that could be interesting, I use mine with a DeWalt portable power station (DCB1800b) and the corresponding batteries resting on top of it to make it completely cordless! It makes the dethatcher go a little deeper + no hassle with the cable.

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  4. Mark

    Buying this dethatcher is probably one of the best purchases of a lawn equipment I’ve ever had. It works great! Dethatches my lawn in more than half the time if I used a rake. Easy to assemble, easy to use. I went over the lawn ONCE and set the dethacher at the highest level and it dethatched A LOT of dead grass. Imagine if I set it on medium or low! I would recommend this lawn equipment to anyone who wants to purchase a dethacher.

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  5. InTartifletteWeTrust

    An excellent Dethatcher, surprisingly effective for its size.
    I was at first a bit skeptical but then the Amzn reviews encouraged me to give it a try, I don’t regret it a bit!
    Renting a dethatcher from HD will cost you $75, you have to pick it up, transport it and return it. I also had some unpleasant surprises with tool rentals: broken or not properly working = second trip.
    Secondly, I am lucky enough to have a smart neighbor: We share tools and bought this one together, hence the cost was a no brainer.

    Does it work?
    It does a great job, does not damage or chop the grass like some others, it’s easy to push and the tines seems to resist use fairly well.
    – Update: after about 40,000 sqf of dethatching, the tines are in a much better shape that I would have imagined, see picture below.

    DO’S and DON’T
    * Don’t pull back, only go forward
    * Remove rocks and branches
    * Don’t use a tiny weeny extension cord, proper gauge is required. If you use 2 extension cord, place the smaller gauge (bigger cord) first. i.e. 12 on the outlet then 14 to the machine.
    * Cut and bag the clippings before dethaching: Overgrown grass doesn’t help.
    * if you have the energy, will and time, use a 90 deg. criss-cross pattern: you’ll be surprised how effective it is.
    * Don’t apply a pre-emergent crabgrass control fertilizer before you dethach, *after* only.

    In order to change the tines, you’ll need
    – 8mm socket,
    – Phillips Screwdriver (Cordless Drill recommended 😉
    – Flat head screwdriver
    – Small mallet or hammer
    *be careful, the screws are not of the highest quality* if you need to change some of them, they are M5 X 22 or M5 X 25
    22 being the length under the head.

    1) Remove the screw(s)
    2) Tap gently with a mallet to crack open the tine cartridge
    3) With a flathead screwdriver, pry open until you can see the pin, **don’t remove the tine cartridge out of the housing**
    4) push out the pin and remove the tine
    5) put a new tine in place
    6) put the tine cartridge back in place, tap gently with a mallet

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  6. Clayton Lee

    I have a very large yard and can no longer do the heavy raking of the thatch in the spring. I was sceptical about buying this but thought if I got two years out of it that would be about the same cost as hiring the job out. Starting in the front I was amazed at how well it worked on the first pass, easily pulling a lot of dead grass. For interest sake, after raking that up I did a second pass and it pulled even more. I did the whole yard in about an hour and the machine did not heat up at all. It comes with extra tines, which is appreciated. As noted by others there is a small trick to putting it together, though in reality it goes together easily, and if you are thoughtful you will be plugging it in in about 15 minutes.
    Now it sits for year, though it is small and doesn’t take up much space. It is light enough to hang on a the wall or from a ceiling. It is one of the purchases I have made recently that allows me to keep doing my own yard work. I give it a 5 star rating, but will adjust if it doesn’t make a second year. Oh and the condition of my lawn has improved significantly as water and fertilizer can now do there job better.

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  7. InTartifletteWeTrust

    After receiving a professional landscaping estimate to repair my lawn for $8,000, I decided to become my own landscaper. I purchased the Green Works 27022 Corded De-thatcher after reading Amazon reviews. (One reviewer mentioned using the recommended heavy duty extension cord, so I purchased that too). I used the Green Works De-thatcher on the entire yard – a total of 4 times (yard is about 100’x110′). I filled 2-96 gallon yard waste containers and 12 Kraft bags (about 32 gallons each) with the debris. Then, my husband and I filled all the old mole holes and tunnel dips with 4 cubic yards of top soil. Next, we spread grass seed on the bare spots, and spread 5 cubic yards of compost over the entire yard. Finally the lawn was well watered. Photos show the results. It isn’t the $8,000 professional lawn, but it has been significantly improved for $500 and a lot of hard work.

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  8. Mark

    My wife struggles every year trying to keep the lawn green and good looking. I cut and trim and she handles over seeding and fertilizing. I watched a promotion of this dethatcher on Youtube and decided that owning was better than renting or having someone charge me $150 to do my yards. We ran this puppy back and forth a couple of times and I was floored by the dead grass that came up. The lawn perked right up and in a couple of weeks we were back to thick and green and the battle of the lawn was finally over….thanks Greenworks.

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  9. JS in Seattle

    This dethatcher did a great job with pulling up the thatch without any issues. Functionally, it’s great. The instructions set you up for failure. 1. Instead of having you install the cord holder first like it should, it tells mentions this after you’ve assembled the whole this. Now I have to disassemble, install cord holder, and reassemble. 2. It tells you that in order to travel with the dethacher you should set the wheels to level “I”. This is the lowest level and will cause the splines to make full contact and bend your splines. Level “III” is the setting that it needs to be on in order for the wheels to give the dethacher a lift and minimize spline contact with the floor. So the instructions were backwards with this stuff and I couldn’t believe it really. I looked at it back and forth several times just to make sure.

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    Greenworks 40V (2-In-1) Dethatcher / Scarifier, Tool Only
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