Greenworks 40V Cordless Backpack Sprayer, 4 Gallon

Definitely a good value, but there are a couple of little things here and there that aren’t ideal. The lid on top does tend to drip a little bit every once in a while even if you crank it down as tight as possible. Not having a removable hose is also one of those things that you may never have an issue with, but if you ever damage the hose, you are kind of out of luck.
The attachments all due what they say they’re supposed to, and I have no problems with them. Also, the battery is great and lasts forever.
Definitely not a bad sprayer and if you already have the batteries or any of the other items in this family, it’s definitely a no-brainer.

I might be a little biased as I own several Greenworks tools. They are light (but not cheap), work exceptionally well and last a loooong time. I have a hedge clipper (fantastic), line trimmer, leaf blower, chainsaw (amazing) and until recently, a mower. The mower was 11 years old when it died and that was my fault. Stupidly, I rinsed the bottom with a garden hose. I could lift this twin blade marvel with one hand.

The sprayer is equally well designed, with quality components. Will be applying lawn pre-emergence. Of course, calibration is required. Check out Average Lawn Guy on YT. I got it done on the first pass. At a walking speed of 81 steps per minute (24″ step, using a metronome app) the sprayer delivered 1 gallon of liquid on a 1,000 sq ft patch in 2 and a half minutes. I can do my entire 10,000 sq ft lawn in 25 minutes. The fan tip, at about 8″ from the ground, produces a consistent and even swath of liquid, about 2 feet wide. The sprayer is light, quiet and super comfortable, especially compared to other backpacks I’ve used. It has both waist and chest straps that keep you snug and comfy. There are so many other choices for sprayers. It was tough to make a decision. I feel I got lucky with this one.

I have many Greenworks products (lawn mower, edger, chipper, blower, 2 chain saws, etc… probably 8 or so) and they work very well. Have always been very pleased (5 stars) until this product.

This product is easy to use and cuts the time of applying chemical by a marked amount. Battery life is very good. It is a huge time savings and worth the money except for the following. The lid leaks and it leaks badly in certain situations. I have twice been doused with chemicals drenching my lower back while using this unit. The first time (round up) I thought I might have spilled some on the sprayer when filling it and then it transferred to me. So I rinsed it and kept using it. I’ve used it many other times without leaking. Then yesterday, I was drenched again. I was using tenacity with blue marking die and immediately after I put it on (before I started spraying) I found my shirt and lower back drenched in blue die. Probably 1/2 cup of fluid made it out the vent. I stripped and washed, then traced the leak through the dye to the vent hole in the lid. The hole is small so sloshing in the tank doesn’t cause a leak, but if you fill to the 4 gallon mark and lean it a little (no where near horizontal) in the wrong direction the fluid comes out into the lid and then rolls down the side and/or rear of the sprayer (and you can’t see this if it is on your back, your first notice is a wet feeling).

I am an engineer with expertise in product design, machine design and fluid mechanics. I do expert consulting in these fields and teach these topics in one of the top 5 engineering schools. The engineers that designed this product (unless my lid is missing a check valve) did not properly design this vent. I took this lid, flipped it upside down and filled it the fluid I was using, and the lid leaked. It takes little pressure to move fluid through it, especially if there is a surfactant in use. I suspect they did not consider how the fluid would interact with the geometry + area of the vent if the fluid in use wasn’t the same viscosity and/or surface tension of water. If the tank is tilted a little, or say it falls over (as is reasonable to have happen to anyone in normal use) then chemicals will leak out. A very simple, low-cost check valve should have been used to prevent users from getting doused with chemicals the engineers should have known are exposure hazards. This is a major safety problem that should not have made it out of the engineering prototyping/testing phase. This should have been caught in testing.

As it is, I can still use the sprayer, but now I don’t feel safe filling it more than half way, so much of the time savings I had earlier experienced is now lost. Greenworks has provided me with great products in the past, but this one will cause me to really look closer at future purchases and/or just switch to other. It really bothers me that people can get exposed to things because of such a simple mistake that should have been identified before product release.

Bought this for spraying weeds without the hand pump. Capacity is great and the backpack is ok but the nozzles that are supplied spray massive amounts of whatever is in the tank. I wanted it for spot spraying of weeds but so much spray comes out at once that that is impractical. It might work better for spraying a large area, but you are going to use a LOT of whatever weed killer or other substance that you might be spraying.

I purchased this sprayer as a replacement for a pump backpack that wore out. I was planning to buy the same sprayer and saw this Greenworks sprayer was on sale for five dollars more. As a Greenworks 40 V system user I made the purchase. I’m very pleased with this sprayer because it is lighter than the pump sprayer making it easier to spray a large area. Being battery powered it is less tiring to use and it has very little drain on a 2.0 mah battery. All of the charge level lights remain lit after spraying the four gallon capacity. My one complaint is that I can’t change the rate of flow.