I use the ZK1 flow sensing in loader. Replaced it just back in October of last year. A couple of questions everything is related, but here is the background. I bought a sludge sucker a few years back, and when I first started using it, it worked great. I’m was and still am using 8gpm and the sludge sucker worked just fine several times. Last fall I tried to use it again and what would happen that time is it would turn on for a second and then it would cut out, it would cycle like this repeatedly, basically making the thing useless. It had been a while since I used it so I thought maybe the tip was clogged, but it was not. So then I started thinking that maybe the tip was too small for 8 gallons per minute. I went to try and change out the tip, but access was impossible. I gave up and quit using it. Not too long after I ended up replacing the unloader, because there were some other issues going on with it. A month later I tried to use the sludge sucker again (after I changed the unloader) and it worked.
Similarly when I was at Northbay Equipment getting my pressure washer serviced, I talk to the mechanic about using a smaller tip to get the water hotter than the 175° I could reach max with my standard 9.0 orfice tip. I found a 3.5 tip in the truck from my old machine a really long time ago and we tested it to see how hot I can get the water by reducing the flow and I was able to get it up above boiling, almost 220°. I asked him if using such a small tip once in a while to get the water super hot to remove oil stains would cause problems with the machine. He said he would recommend going no lower than 5.5, but either way the rest of the water would flow back through the bypass. When we tested the 3.5 to see how hot it would get, it did not cut out and it worked fine for several minutes. Then about two weeks later, my tech accidentally ended up putting the same 3.5 tip on the gun and it was doing the same thing as the sludge sucker was doing. Turning on for a second and then cycling off. Here are my two questions.
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Is the cycling problem with using smaller tips, including the one in the sludge sucker, an indicator that the unloader is failing?
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Would using a 3.5 or 5.5 tip on an 8 GPM to get the heat up, cause problems with the unloader or the pump, or would the bypass negate any issues from using too small of a tip to get super high heat or to use the sludge sucker that I cannot change the tip on?
I’m thinking my unloader is going bad since both the sludge sucker and using a smaller tip to get higher heat no longer work like they did, working constantly without cycling…
Maybe @dperez and/or @Firefighter4hire might know best as they seem to be the experts in all mechanicals of these machines.