Bstarr3 Posted December 5, 2019 Share Posted December 5, 2019 I've developed an issue with my HS Evo CR. I'm getting bubbling back into the cup as soon as air flows, which goes down a little with pulling the needle back, but it doesn't matter because the paint's splattered out of the cup and all over by then. Obviously some part is messed up, but my question is which part? Do I need to replace the nozzle, needle, both? Are there any orings or seals that could cause this issue? I just did a complete teardown clean with lt which did not resolve the issue. Thanks for input! Link to comment Share on other sites More sharing options...
chrish Posted December 5, 2019 Share Posted December 5, 2019 When my Iwata does that it’s because it’s got gunk after the needle valve behind the forward cap where the needle protrudes from the gun, the air is supposed to siphon, draw the paint out of the cup but, when the air bypass (around the needle nozzle) get plugged the air goes back up into the color cup.....basically saying I think it needs a more thorough cleaning, paying attention to the business end. just an opinion though. Link to comment Share on other sites More sharing options...
Landrotten Highlander Posted December 5, 2019 Share Posted December 5, 2019 (edited) I was going through the handbook : online version https://www.harder-airbrush.eu/files/downloads/manuals/Evolution Manual.pdf It said on page 11 of 36 (downloaded the pdf file): Air pockets or bubbling in the paint cup (D): a) Tighten the air head (B) more fi rmly into position b) Clean the nozzle/nozzle seal (C) c) Replace the nozzle/nozzle seal (C) I suspect there are a few airholes in the nozzle that are blocked by dried-up paint. Submerging this component overnight in paint thinner or Dettol might do the trick (when using Dettol make sure to be in a well ventilated area when rinsing thouroughly the following day) hope this helps Edited December 5, 2019 by Landrotten Highlander Link to comment Share on other sites More sharing options...
Ryan Posted December 5, 2019 Share Posted December 5, 2019 Is the needle fully seated into the nozzle opening? The other suggestions from Landrotten is spot on too. Link to comment Share on other sites More sharing options...
Eagle Driver Posted December 6, 2019 Share Posted December 6, 2019 Tiny crack in the nozzle caused that same issue for me. Barely visible too. Link to comment Share on other sites More sharing options...
Jager Posted December 6, 2019 Share Posted December 6, 2019 (edited) After cleaning and repair, don't forget to put a bit of beeswax on all the threads during reassembly. I use Burt's Bees, Beeswax Lip Balm. This will seal any possible air leaks. Jager Edited December 6, 2019 by Jager MikeMaben 1 Link to comment Share on other sites More sharing options...
Phantom2 Posted December 7, 2019 Share Posted December 7, 2019 (edited) I have a HS Evolution and I had some bubbling in the cup. Landrotten and the others are spot on, but I will add this; After every paint-session and when you have given your AB a good thorough cleaning, unscrew the nozzle a little until next painting session. This gives the O-ring seal a time to "relax" and next time it will be tight again. I haven´t had any problems with bubbling in the cup since I started doing this, about a year ago. If nothing of this solves your problem, It might be a crack in the nozzle and then you have to replace it entirely. I can recommend you get a Nozzle cleaning set; Cheers! Stefan Edited December 7, 2019 by Phantom2 Link to comment Share on other sites More sharing options...
MikeMaben Posted December 11, 2019 Share Posted December 11, 2019 On 12/6/2019 at 7:32 AM, Jager said: After cleaning and repair, don't forget to put a bit of beeswax on all the threads during reassembly. I use Burt's Bees, Beeswax Lip Balm. This will seal any possible air leaks. Jager Good ol' Chapstick works as well. Link to comment Share on other sites More sharing options...
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