Question about Roundup 190327 Professional S2 Backpack Sprayer, 4-gallon

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My round up backpack sprayer will not build pressure and spray

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My flo master hd4 will not pump for pressure handle seems to b lock just goes up down but build no pressure


this isn't a pool pump but a 4 gal backpack sprayer , ive got one of these there great and allow you to spray a bunch with out reloading it , sorry to hear yours got problems , once id left mine with a bit of rust proofer in it and it did something like u described , what I did was dump near boiling hot water in the tank and give it several pumps , what ever it was that was blocking the pump up got dissolved in the hot water and went right on out the end , I don't leave it full any longer as ive learnernt my lesson

Feb 29, 2016 | Pool & Spa

1 Answer

Best spray tip nozzle for herbicide application, SOLO 425


tee jet yellow nozzle with metal inserts john deere/lesco sells them in packs of four these are best for 1 gal per k spot treating selective herbicide ......round up just use the adjustable cone

Jan 14, 2011 | Solo Backpack Sprayer

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Trying to remove pressure tank from inside spray unit. trying to replace all seals.


dont !!!!! just buy a new one bout 100 bucks but if u want it comes out thru top but u have to take lose underneath
way too labor intensive for the price of new one

Dec 31, 2010 | Solo 475 Backpack Sprayer Back Pack...

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I have a 3 gal. back sprayer. When you try to presureize the tank to spray, The pump seems to work but there is no pressure. If repairs are necessary, where in the Redding, Ca. area is a repair shop for...


Hi there
There are many possible reasons for your sprayer not pressurizing. If the pump lever is moving freely and does not seem to be building pressure while pumping it is possible that the O-ring at the valve is damaged, the seal in the pressure regulator is leaking, the piston or the collar is worn. Any of these problems will require disassembly of the unit and inspection of each part. If you do feel resistance building as you pump but quickly loose pressure you likely have leaks in the diaphram, it's seal, the pressure cylinder or the tank itself.
If you are comfortable disassembling the unit and inspecting the parts for wear or damage most of the individual replacement parts are fairly easy to replace and readily available online from Solo or at many retail outlets and supply companies. Solo has done a great job with how-to videos and instructions for each procedure on their web site www.solousa.com
If you are not comfortable disassembling and repairing your sprayer yourself you can try contacting a mower/equipment repair shop in the Redding area as is seems the nearest Authorized Solo sprayer repair center is Cloverdale Saw in Cloverdale CA, 707-894-2273

Dec 31, 2010 | Solo Backpack Sprayer 3 Gallon Capacity,...

3 Answers

Solo 425 and 475 spray packs.


I have a 425 that I have had to remove the pressure cylinder. I found this on the internet one time, but can't find it again. Anyhow, this is how to remove the pressure cylinder on a Solo 425. Do all the disassembly instructions in the owners manual. Then get a short 2x4 or 2x2 and place it on top on the pressure cylinder through the opening on top of the tank. Then give it a good whack with a hammer. Don't be shy, that ****** is in there. It may take more than one whack. Once you have the cylinder out there is a screen on the cylinder that must be cleaned. To re-assemble, turn the sprayer upside down, insert the pressure cylinder, lay the 2x4 across the bottom of the cylinder and use even force (and hammer) to force the cylinder back in. Stop when you get to the O ring seat and you can do the rest by hand, being careful not to pinch the O ring. I have had Solo sprayers for many years and think they are great. But when it seems that when I leave glyphosate (Roundup) in the sprayer it clogs the screen. My hard water may contribute to the problem.

Mar 27, 2009 | Solo Backpack Sprayer

2 Answers

Sprayer wont spray or hold pressure


We use the both the 425 and 475 solo sprayers most days at work and when they start to lose pressure ( after 6 months of daily professional use) we purchase a complete seal kit and put it through them. The only part I can't work out how to remove is the inside cylinder, other than that everything else is easily removed and replaced.

Jan 14, 2009 | Solo Backpack Sprayer

2 Answers

Sprayer Question


Hose end sprayers are the simplest and least expensive of the category. A sprayer jar is attached to a regular garden sprayer. Concentrated material is added to the sprayer jar. An adjustment on the jar determines the amount delivered. The force of the water through the hose pulls the material up from the jar and mixes and dilutes it with the water. A built-in anti-siphon device prevents unused material from being pulled back into your water supply. Compression or tank sprayers are the most common type of spray equipment. Concentrated material is added to the tank. Water is then added to a marked fill line. The remaining air is pressurized by pumping the handle a designated number of times. A control lever on the wand controls the spray pattern and amount. Compression sprayers provide a precise, on target, non-drift spray good for soil and lawn pests. Adjust the sprayer for a coarse, drenching spray, a concentrated stream or a fine mist. Tank capacities range from 1 quart to over 3 gallon for handheld models. Homeowner type backpack sprayers hold up 4 gallons. The tanks may be made from polyethylene plastic, galvanized steel or stainless steel. In addition to treatments for pests and diseases, compression sprayers are designed for applying cleaning solutions for decks and siding. Backpack sprayers are operated in the same manner as the handheld compression sprayer. The over-the-shoulder configuration makes it easier to carry the heavier load of material. Some backpack models also use a lever-style pump to maintain pressure without removing the unit form your back. Powered sprayers rely on a gasoline engine for spray power. Great for larger yards or gardens due to portability and capacity (12 gallons). Dusters are a slightly different breed. Dry powders (mostly for blooming plants such as roses) are added to a canister and applied by manually pumping. NOTE: Compression sprayers deliver liquid under pressure. Compression sprayers are powerful and efficient tools. This fact also makes them potentially dangerous. Always read the manufacturer's instructions and safety precautions carefully.

Aug 27, 2008 | Sp Systems 02sv320065 Farm & Home 2 -...

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