20 Most Recent Solo Backpack Sprayer Questions & Answers

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.

chabunga offered really good info...except for the suggestion to use Vaseline on the 'O' ring. NEVER use Vaseline on anything rubber, because it is a petroleum based product and it will cause the ring to deteriorate. Use a non-petroleum based lubricant instead.

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

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.

I think you need to remove the pressure cylinder. I've had the same problem with my 425 and there is a screen on the cylinder that must be cleaned. To remove the cylinder, do all the disassembly in the owners manual. Then get a short piece of 2x4 or 2x2. Place the end of the 2x4 on the pressure cylinder through the top of the tank. Give it a good whack with the hammer. It may take more than one good whack to free it, but it will come loose. Then inspect/clean the screen. You are going to have to use some force to get it back in. Turn the sprayer upside down, insert the pressure cylinder, lay the 2x4 across the bottom of the pressure cylinder and use even force to tap it back in. Stop when you get to the O ring collar and do the rest by hand being careful not to pinch the O ring. It may help to lube the O ring with vaseline.