Greenworks 40V 15 inch Dethatcher/Scarifier, Tool Only

This device worked great. It came with the scarifier in place, which I used (I did not try the included thatcher adapter). Assembly was not at all challenging, with fairly good illustrations. Height adjustment is simple. I cut the grass low (second lowest setting on my Greenworks 80V mower), then set the scarifier unit to the second lowest setting, and it worked beautifully. My intention was to put slits in the lawn before seeding. Reading reinforced my intuition that soil contact is paramount in fostering seed germination and growth. I believe that to be true, because I'm pretty sure I heard the grass seeds parachuting from my spreader whooping and hollering and high-fiving each other when they hit the scarified ground (LOL). The unit left tidy slits without destroying the lawn. One caveat is that the ground should be dry. On very dry lawn the unit kicked up some dust, but not a lot. On the other hand, I had some areas where drainage is suboptimal and the soil was damp, and the unit had a tendency to "grab" and pull/jerk me and tear up the lawn somewhat. This can be completely avoided by limiting use to dry turf. The unit (again, this is with the scarifier adapter) pulled a lot of thatch out of the lawn, and removing the thatch was ninety percent of the job. The unit itself is very light, tends to pull itself along, and is remarkably easy to use as long as you avoid moist grass, where it misbehaves as described above. I elected to suck up the thatch with my Greenworks mower, which was quite labor intensive, requiring two or three passes (a higher-RPM gasoline mower might be more effective). A leaf rake would undoubtedly be effective, though I'm not sure the lawn would have the neat crisp appearance that mowing provides. Since I ended up mowing the lawn to pick up the thatch, I thought I might skip a step and tried using the scarifier on uncut grass. This worked pretty well, but the end result was that the grass looked a little scruffy compared with the lawn that was pre-cut and later mowed after scarifying. One of the best things about this whole process is that the lawn looked quite good after the process, which I appreciated. A lot of lawns appear torn up for weeks after aerating, and I was happy that I was able to avoid that scenario. My last comment is battery life. I had to charge the battery three times to scarify my lawn (half acre lot, of which about half is lawn), However, I am reluctant to comment here because the 4 Ah battery I have from my other tools is probably going on ten years old, and very likely has reduced output at this point. Overall, this is a definite 5-star purchase for performance and ease of use.

Why did you pick this product vs others?: I have used the 40V mower for a year, and I am convinced that this will also be a reliable tool. Ease of assembly: The instruction is clear enough. There is no need to use any other tools but your hands. Mower quality: The thatcher does a wonderful job in cleaning up my tree lawn strip. Maneuverability: The same with my mower, it is self-propelled. So, just walk behind it, and keep yourself away from any danger. Storage capacity: I keep it in my garage, next to a wall. Battery life: My experience with the mower is that after fully charged, the mower can run for about 45 minutes. Because the thatcher shares the same battery/charger set, I figure the runnning time would be about the same. Value for money: My two tree lawn strips needs to be revived. The grass is not in good condition now. It is timely to get this thatcher before the end of August, in order for me to reseed. The whole purpose if to SAVE money. If I were to hire experts to do this project for me, I figure it will take several thousand dollars. So, for the sake of getting jobs done without spending too much, I chose to DIY.

The product works well. My yard is small and I can only make one pass up and back before stopping to empty the bag. This makes the job take 3 times as long. Contacted Greenworks to attempt to purchase another bag so one person could keep thatching while another person emptied the second bag. Greenworks customer service said they only support the product if it is broken. That is disappointing.

I ordered a smaller, corded one and it never came, so I canceled the order and quickly ordered this one without paying close attention, having no idea it was cordless. It didn't have a battery or charger, so I ordered those next and put it to work on my PNW moss-infested lawn. My lawn has never been de-thatched, so it was a giant, flat, bird's nest and I was very skeptical. As I de-thatched, once in a while, it appeared that smoke was coming from the motor, but I checked carefully and it wasn't; it was just dust from the ground. The motor and battery just kept cranking away with tons of power. I went over my yard once and it produced bales of thatch and moss, then I went over it again and the same thing. I'm very happy with how this worked-out and I'm gonna stay on top of this now lol; keep it de-thatched. I stretched a bungee across the bars to hold the bag door open and not use the bag this way. Otherwise the bag would fill in literally ten seconds in my case. I wore safety goggles and long pants to be safe and this worked for me; probably not recommended by the manufacturer. Love this machine!

The tool works fairly well. Kind of feel it needs to be not abused to last long. It definitely doesn’t have the power of a corded but it’s adequate if you’re careful using it. The main benefit is not having to navigate the cord strewn across your lawn. However, every single tool needs a different voltage battery so you end up having to buy new batteries that sit forever mostly unused because there’s no cross compatibility. Complete scam.

Worked really well. It’s lightweight, so easy to maneuver.

Very good little machine, lightweight, easy to put together and works really well, although I have only used the dethatcher. I bought it without the battery as I already had 40V batteries from my other greenworks tools. Noise-wise it is not noisy at all and really good value for money. Power is good and collection is very good as well.

The dethatcher tines worn down too fast, some broke without hitting obstacles. The wear down tines are not replaceable! And Greenworks had no inventory to purchase the whole tine cylinder! Their 14" electric model has replaceable tines on its tine cyl8nder. Greenworks failed to provide adapter to allow this 15" model to use the much better thoughtout 14" tine cylinder.

Unfortunately it took too long to buy a battery for this and try it so I am unable to return it but the machine just straight up doesn’t work. Battery is fully charged, and I’m using properly. Just doesn’t turn on. Dead. Nothing. What a disappointment.